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From: CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es>
Date: Wed, 1 Sep 2021 20:49:03 +0200
Message-ID: <CALypLp9c=GKPRyprBZidXsJExoif0QWtDSdT-vQnkN9MCUBYCQ@mail.gmail.com>
To: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
Cc: Pascal Thubert <pthubert@cisco.com>, "<int-dir@ietf.org>" <int-dir@ietf.org>, Last Call <last-call@ietf.org>,  draft-ietf-ipwave-vehicular-networking.all@ietf.org, its <its@ietf.org>,  Russ Housley <housley@vigilsec.com>,  skku-iotlab-members <skku-iotlab-members@googlegroups.com>, Chris Shen <shenyiwen7@gmail.com>
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Subject: Re: [Int-dir] [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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Thanks Paul for the review!

Pascal, would it be possible for you to take a look and comment if you are
happy with the new version?

Thanks!

Carlos

On Mon, Aug 30, 2021 at 3:13 PM Mr. Jaehoon Paul Jeong <
jaehoon.paul@gmail.com> wrote:

> Hi Pascal,
> Here is the revision (-21) of IPWAVE PS Draft:
>
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-network=
ing-21
>
> I attach the revision letter to show how I have addressed your comments o=
n
> the revision.
>
> Chris and I have worked for this revision together.
>
> If you have further comments, please let me know.
>
> Thanks.
>
> Best Regards,
> Paul
>
>
>
> On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert via Datatracker <
> noreply@ietf.org> wrote:
>
>> Reviewer: Pascal Thubert
>> Review result: Not Ready
>>
>> Dear authors
>>
>> In summary:
>>
>> I read a number of very good drafts collated in one, from the use cases
>> that
>> very complete and ready to publish, to the architecture and protocol
>> solution
>> in section 4 that would require more work for completeness.
>>
>> There are multiple instances in the use cases where protocols are listed
>> coming
>> out of the blue, e.g., the references to OMNI that seem artificially
>> spread
>> regardless of the context of the section. OMNI is used throughout, both
>> as an
>> open ended toolbox, and as a carpet under which all problems can be
>> hidden.
>>
>> Reading this doc, OMNI shows as an interface to a software mobile router=
,
>> with
>> multiple of the device physical interfaces connected to the mobile
>> router. This
>> makes the stack very simple as the complexity moves to the router. But
>> now you
>> have to implement the router. Presented as that, the OMNI router deserve=
s
>> its
>> name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANE=
T (many to
>> choose from) and NEMO (and all the MIP protocol family across address
>> families), all the possible radio interfaces on which the ND problems go
>> away
>> by magic, and whatever else you want to put in there. Is that the
>> intention?
>>
>> Instead of referring to OMNI for virtually anything, the doc should refe=
r
>> to
>> MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),
>> draft-nordmark-intarea-ippl for split subnets, and
>> draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet
>> models. And
>> then you can say that all those components can be plugged in the OMNI
>> router,
>> and you can discuss which MANET and which MIP you want, including using
>> OMNI=E2=80=99s
>> built in mobility.
>>
>> Note that my objections are not against the OMNI design, it might be the
>> perfect thing and I am already aware of use cases that could be served b=
y
>> a
>> P2MP interface like OMNI in conjunction with RFC8505 on the P2P
>> subinterfaces
>> (recycling the high level design we=E2=80=99ve been shipping for IPv4 / =
frame
>> relay for
>> the last 30 years). My objection is of the way the draft uses [OMNI] as
>> the
>> magic wand that solves all the problems when what you really do is throw
>> them
>> over the fence. I=E2=80=99d rather you focus on problems and use cases, =
for which
>> there=E2=80=99s excellent text, and indicate what needs to be done witho=
ut making
>> assumption on how the needful things will be solved.
>>
>> In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to =
split,
>> keep all
>> that=E2=80=99s use case and problem description and ship it, remove refe=
rences to
>> protocols envisioned in the solution, and start the work on architecture
>> of the
>> solution and the protocol applicability statements separately. An
>> alternate
>> would be to centralize the discussion on protocols to annex, and explain
>> that
>> protocol A or B could be envisioned in solution space because to over
>> this gap
>> or implement that function.
>>
>> In any fashion, the current text is not ready for publication as
>> applicability
>> statement, architecture and or/solution, so the related work should be
>> removed
>> from the main text. But I find it mostly ready for use case and problem
>> statement, more below.
>>
>> Review:
>>
>> Abstract
>>
>>    This document discusses the problem statement and use cases of
>>    IPv6-based vehicular networking for Intelligent Transportation
>>    Systems (ITS).
>>
>> >>> The document goes beyond that; there was actually a thread at 6MAN
>> where
>> Bob Hinden said =E2=80=9C This document says it is a problem statement, =
but then
>> becomes a solution document.   Might be better to cut it down to only th=
e
>> problem statement part. =E2=80=9C >>> Would you consider doing this? If =
not, why?
>> Note:
>> you may want to respond on 6MAN as well. >>> >>>I would have thought tha=
t
>> the
>> traditional steps of problem statement and applicability statement of
>> existing
>> work could be expected from IPWAVE too. >>> Please clarify the steps tha=
t
>> you
>> intend to follow next with this work.
>>
>> <snip>
>>
>> 1.  Introduction
>>
>> >>> Very readable and informative section, many thanks!
>>
>>    Along with these WAVE standards and C-V2X standards, regardless of a
>>    wireless access technology under the IP stack of a vehicle, vehicular
>>    networks can operate IP mobility with IPv6 [RFC8200] and Mobile IPv6
>>    protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (PMIPv6)
>>    [RFC5213], Distributed Mobility Management (DMM) [RFC7333], Locator/
>>    ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Extended
>>    Route Optimization (AERO) [RFC6706BIS]).
>>
>> >>> NEMO (RFC 3963) is not cited. Any reason why the vehicle would not
>> transport a network?
>>
>> <snip>
>>
>>    This document describes use cases and a problem statement about
>>    IPv6-based vehicular networking for ITS, which is named IPv6 Wireless
>>    Access in Vehicular Environments (IPWAVE).  First, it introduces the
>>    use cases for using V2V, V2I, and V2X networking in ITS.  Next, for
>>    IPv6-based vehicular networks, it makes a gap analysis of current
>>    IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Management,
>>    and Security & Privacy), and then enumerates requirements for the
>>    extensions of those IPv6 protocols, which are tailored to IPv6-based
>>    vehicular networking.  Thus, this document is intended to motivate
>>    development of key protocols for IPWAVE.
>>
>> >>>
>>
>> <snip>
>>
>> 2.  Terminology
>>
>> >>>
>>
>> <snip>
>>
>>    o  IP-OBU: "Internet Protocol On-Board Unit": An IP-OBU denotes a
>>       computer situated in a vehicle (e.g., car, bicycle, autobike,
>>       motor cycle, and a similar one) and a device (e.g., smartphone and
>>       IoT device).  It has at least one IP interface that runs in IEEE
>>       802.11-OCB and has an "OBU" transceiver.  Also, it may have an IP
>>       interface that runs in Cellular V2X (C-V2X) [TS-23.285-3GPP]
>>       [TR-22.886-3GPP][TS-23.287-3GPP].  See the definition of the term
>>       "OBU" in [RFC8691].
>>
>> >>> Can that be a router connecting multiple computers?
>>
>> <snip>
>>
>> 3.  Use Cases
>>
>> >>> This is another great read and an enlightening section. Maybe mentio=
n
>> in
>> the abstract that the doc also covers use cases?
>>
>> <snip>
>>
>>    Although a Layer-2 solution can provide a support for multihop
>>    communications in vehicular networks, the scalability issue related
>>    to multihop forwarding still remains when vehicles need to
>>    disseminate or forward packets toward multihop-away destinations.  In
>>    addition, the IPv6-based approach for V2V as a network layer protocol
>>    can accommodate multiple radio technologies as MAC protocols, such as
>>    5G V2X and DSRC.  Therefore, the existing IPv6 protocol can be
>>    augmented through the addition of an Overlay Multilink Network (OMNI)
>>    Interface [OMNI] and/or protocol changes in order to support both
>>    wireless single-hop/multihop V2V communications and multiple radio
>>    technologies in vehicular networks.  In such a way, vehicles can
>>    communicate with each other by V2V communications to share either an
>>    emergency situation or road hazard in a highway having multiple kinds
>>    of radio technologies, such as 5G V2X and DSRC.
>>
>> >>> This text appears in the middle of high level use case, with a crude
>> list
>> of protocols; this is not a place for it
>>
>> >>> On a 6MAN Thread, Brian Carpenter said that the above:
>> =E2=80=9C
>> is of concern regardless of the mention of OMNI. Does it mean "can be" o=
r
>> "needs to be"? This paragraph seems like a very short summary of a big
>> problem
>> area. At the end of page 13 there is some related discussion, which
>> mentions
>> RPL as part of the solution (good choice, IMHO) but again seems to depen=
d
>> on
>> OMNI. I don't think the fix of simply removing references to OMNI works,
>> because it would leave a gap. In an informational document, that is not =
a
>> formal problem but as far as this draft describes architecture, I don't
>> think
>> that big a gap is reasonable. "OMNI" is mentioned more than 20 times in
>> the
>> document. There are also several references to AERO, which is strongly
>> associated with OMNI. =E2=80=9C >>> I agree with Brian. Here the documen=
t seems
>> to be
>> mixing solution with problem and putting the cart before the horse. My
>> recommendation is to stick to what needs to be done that IPv6 does not d=
o
>> yet
>> -the reqs and gaps-; but the doc should not step in the how things will
>> be done
>> unless the group already decided to do it. The logical next steps to a P=
S
>> are
>> an applicability statement of existing work, and if the gaps cannot be
>> filled,
>> there may be one or more WG chartered to fill those gaps.
>>
>> >>> I=E2=80=99d still be happy to see an annex with leads on where the s=
olution
>> might
>> come from like RFC 8691 does.
>>
>> <snip>
>>
>>    The existing IPv6 protocol must be augmented through the addition of
>>    an OMNI interface and/or protocol changes in order to support
>>    wireless multihop V2I communications in a highway where RSUs are
>>    sparsely deployed, so a vehicle can reach the wireless coverage of an
>>    RSU through the multihop data forwarding of intermediate vehicles.
>>    Thus, IPv6 needs to be extended for multihop V2I communications.
>>
>> >>> Note that I have no clue on how well OMNI applies in that space,
>> maybe it
>> does very well; but here it comes out of the blue with no justification.
>> If you
>> mention OMNI you need to detail what it is and which of the V2V  problem=
s
>> you
>> expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.
>>
>> <snip>
>>
>>    The existing IPv6 protocol must be augmented through the addition of
>>    an OMNI interface and/or protocol changes in order to support
>>    wireless multihop V2X (or V2I2X) communications in an urban road
>>    network where RSUs are deployed at intersections, so a vehicle (or a
>>    pedestrian's smartphone) can reach the wireless coverage of an RSU
>>    through the multihop data forwarding of intermediate vehicles (or
>>    pedestrians' smartphones).  Thus, IPv6 needs to be extended for
>>    multihop V2X (or V2I2X) communications.
>>
>> >>> Please be more specific on what the missing functions are and whethe=
r
>> they
>> are missing from the stack development standpoint or if there=E2=80=99s =
work
>> needed
>> from the IETF. 1)      If something is really missing in our specs, the
>> text to
>> prove from the use case above is missing 2)      how OMNI serves the use
>> case
>> could be elaborated in an applicability statement of OMNI for V2xyz, but
>> it is
>> a bit blunt to present it as panacea when the problems to be solved are
>> not
>> listed. 3)      If you look at it, OMNI seems like a software mobile
>> router
>> within a bump in the stack. Can that become too big?
>>
>> >>> my view is that the text above and the similar occasions should be
>> replaced
>> by something like :
>>
>>    The existing IPv6 protocol must be augmented to provide the following
>>    functions: 1) =E2=80=A6
>>
>> >>> and / or something like:
>>
>>    In addition to the IPv6 node requirements [RFC 8504], the IPv6 protoc=
ol
>>    stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=A6
>>
>> <snip>
>>
>>    To support applications of these V2X use cases, the functions of IPv6
>>    such as VND, VMM, and VSP are prerequisites for IPv6-based packet
>>    exchange, transport-layer session continuity, and secure, safe
>>    communication between a vehicle and a pedestrian either directly or
>>    indirectly via an IP-RSU.
>>
>> >>> =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=9D do=
es not parse.
>> There=E2=80=99s
>> no IPv6 reference that provides those functions. If the intention is to
>> say
>> that there=E2=80=99s stuff to add to IPv6 to support, like, say,  VND, t=
hen this
>> document fails to define how an IPv6 VND should behave, though it=E2=80=
=99s
>> precisely
>> what I=E2=80=99d expect from a problem statement.
>>
>> <snip>
>>
>> 4.  Vehicular Networks
>>
>> >>> What is the purpose of section 4 as a whole, problem statement or
>> applicability statement of the listed protocols? In the former case
>> what=E2=80=99s the
>> problem? In the latter case it is incomplete and needs to be exported to
>> an
>> applicability statement doc with all the possible technologies evaluated=
.
>>
>>    This section describes an example vehicular network architecture
>>    supporting V2V, V2I, and V2X communications in vehicular networks.
>>
>> >>> I read this as presenting a context to explain what the problems are
>> instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe u=
sing the term
>> =E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=
=99s comment.
>>
>> <snip>
>>
>> 4.1.  Vehicular Network Architecture
>>
>>    Figure 1 shows an example vehicular network architecture for V2I and
>>    V2V in a road network [OMNI].
>>
>> a.      Is using OMNI a decision that the WG made for the future work ?
>> what
>> does it do and what does it not do? b.      Is there work left to be
>> done? Who
>> will do that work? Or is it the expectation that OMNI has it all defined
>> already?
>>
>> <snip>
>>
>>    An existing network architecture (e.g., an IP-based aeronautical
>>    network architecture [OMNI][UAM-ITS], a network architecture of
>>    PMIPv6 [RFC5213], and a low-power and lossy network architecture
>>    [RFC6550]) can be extended to a vehicular network architecture for
>>    multihop V2V, V2I, and V2X, as shown in Figure 1.  In a highway
>>    scenario, a vehicle may not access an RSU directly because of the
>>    distance of the DSRC coverage (up to 1 km).  For example, the OMNI
>>    interface and/or RPL (IPv6 Routing Protocol for Low-Power and Lossy
>>    Networks) [RFC6550] can be extended to support a multihop V2I since a
>>    vehicle can take advantage of other vehicles as relay nodes to reach
>>    the RSU.  Also, RPL can be extended to support both multihop V2V and
>>    V2X in the similar way.
>>
>> >>> all this could fit well in annex; anyway you need to explain what yo=
u
>> expect the protocols to do and which extension is needed. In the case of
>> RPL at
>> least you indicate that it would do routing, but not why you cannot use
>> it of
>> the shelf; for OMNI, what you expect is less clear, though there=E2=80=
=99s text
>> elsewhere about the many radio interfaces that could be used for the
>> purpose,
>> and the text in the UAM below that is enlightening.
>>
>> <snip>
>>
>>                                   To support not only the mobility
>>    management of the UAM end systems, but also the multihop and
>>    multilink communications of the UAM interfaces, the UAM end systems
>>    can employ an Overlay Multilink Network (OMNI) interface [OMNI] as a
>>    virtual Non-Broadcast Multiple Access (NBMA) connection to a serving
>>    ground domain infrastructure.
>>
>> >>> Again, what is the expectation for OMNI? As an overlay it requires a=
n
>> underlay; when connecting to a MANET it needs support for that MANET. Th=
e
>> text
>> above seems to imply that is solves everything in V2xyz like magic;
>> reminds me
>> of the IPv6 multicast abstraction that was supposed to solve the broadca=
st
>> problem and ended up worsening it.
>>
>> <snip>
>>
>>                             This infrastructure can be configured
>>    over the underlying data links.  The OMNI interface and its link
>>    model provide a means of multilink, multihop and mobility
>>    coordination to the legacy IPv6 ND messaging [RFC4861] according to
>>    the NBMA principle.  Thus, the OMNI link model can support efficient
>>    UAM internetworking services without additional mobility messaging,
>>    and without any modification to the IPv6 ND messaging services or
>>    link model.
>>
>> >>> Again, what is the expectation for OMNI? As an overlay it requires a=
n
>> underlay; the text above seems to imply that is solves everything in
>> V2xyz like
>> magic; that would be a stretch, that reminds me of IPv6 multicast that w=
as
>> supposed to solve the broadcast problem and ended up worsening it.
>>
>> <snip>
>>
>>    Multiple vehicles under the coverage of an RSU share a prefix just as
>>    mobile nodes share a prefix of a Wi-Fi access point in a wireless
>>    LAN.  This is a natural characteristic in infrastructure-based
>>    wireless networks.  For example, in Figure 1, two vehicles (i.e.,
>>    Vehicle2, and Vehicle5) can use Prefix 1 to configure their IPv6
>>    global addresses for V2I communication.  Alternatively, mobile nodes
>>    can employ an OMNI interface and use their own IPv6 Unique Local
>>    Addresses (ULAs) [RFC4193] over the wireless network without
>>    requiring the messaging of IPv6 Stateless Address Autoconfiguration
>>   (SLAAC) [RFC4862], which uses an on-link prefix provided by the
>>    (visited) wireless LAN; this technique is known as "Bring-Your-Own-
>>    Addresses".
>>
>> >>>  Is OMNI the only way to "Bring-Your-Own-Addresses=E2=80=9D? Else th=
e text
>> could be
>> more generic, at least use e.g., like the ref to AERO later. >>> What ar=
e
>> the
>> implications / limitations of doing that =E2=80=93 like they can do line=
 of sight
>> V2V
>> but not reach the internet, or the need of  a local MANET / RPL that wil=
l
>> accept to route those addresses, or the security / address ownership
>> validation
>> issues ?
>>
>> <snip>
>>
>>    A single subnet prefix announced by an RSU can span multiple vehicles
>>    in VANET.  For example, in Figure 1, for Prefix 1, three vehicles
>>    (i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a connected
>>    VANET.  Also, for Prefix 2, two vehicles (i.e., Vehicle3 and
>>    Vehicle6) can construct another connected VANET, and for Prefix 3,
>>    two vehicles (i.e., Vehicle4 and Vehicle7) can construct another
>>    connected VANET.  Alternatively, each vehicle could employ an OMNI
>>    interface with their own ULAs such that no topologically-oriented
>>    subnet prefixes need be announced by the RSU.
>>
>> >>>  same as above. This seems to restate the same thing, derive an
>> address
>> from a topologically correct prefix or use your own with limitations to =
be
>> described.
>>
>> <snip>
>>
>>    For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]
>>    specifies several details, including Maximum Transmission Unit (MTU),
>>    frame format, link-local address, address mapping for unicast and
>>    multicast, stateless autoconfiguration, and subnet structure.  An
>>    Ethernet Adaptation (EA) layer is in charge of transforming some
>>    parameters between the IEEE 802.11 MAC layer and the IPv6 network
>>    layer, which is located between the IEEE 802.11-OCB's logical link
>>    control layer and the IPv6 network layer.  This IPv6 over 802.11-OCB
>>    can be used for both V2V and V2I in IPv6-based vehicular networks.
>>
>> >>>  solution space.
>>
>> <snip>
>>
>>    An IPv6 mobility solution is needed for the guarantee of
>>    communication continuity in vehicular networks so that a vehicle's
>>    TCP session can be continued, or UDP packets can be delivered to a
>>    vehicle as a destination without loss while it moves from an IP-RSU's
>>    wireless coverage to another IP-RSU's wireless coverage.  In
>>    Figure 1, assuming that Vehicle2 has a TCP session (or a UDP session)
>>    with a corresponding node in the vehicular cloud, Vehicle2 can move
>>    from IP-RSU1's wireless coverage to IP-RSU2's wireless coverage.  In
>>    this case, a handover for Vehicle2 needs to be performed by either a
>>    host-based mobility management scheme (e.g., MIPv6 [RFC6275]) or a
>>    network-based mobility management scheme (e.g., PMIPv6 [RFC5213] and
>>    AERO [RFC6706BIS]).
>>
>>    In the host-based mobility scheme (e.g., MIPv6), an IP-RSU plays a
>>    role of a home agent.  On the other hand, in the network-based
>>    mobility scheme (e.g., PMIPv6, an MA plays a role of a mobility
>>    management controller such as a Local Mobility Anchor (LMA) in
>>    PMIPv6, which also serves vehicles as a home agent, and an IP-RSU
>>    plays a role of an access router such as a Mobile Access Gateway
>>    (MAG) in PMIPv6 [RFC5213].  The host-based mobility scheme needs
>>    client functionality in IPv6 stack of a vehicle as a mobile node for
>>    mobility signaling message exchange between the vehicle and home
>>    agent.  On the other hand, the network-based mobility scheme does not
>>    need such a client functionality for a vehicle because the network
>>    infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility agent
>>    handles the mobility signaling message exchange with the home agent
>>    (e.g., LMA in PMIPv6) for the sake of the vehicle.
>>
>>    There are a scalability issue and a route optimization issue in the
>>    network-based mobility scheme (e.g., PMIPv6) when an MA covers a
>>    large vehicular network governing many IP-RSUs.  In this case, a
>>    distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate the
>>    scalability issue by distributing multiple MAs in the vehicular
>>    network such that they are positioned closer to vehicles for route
>>    optimization and bottleneck mitigation in a central MA in the
>>    network-based mobility scheme.  All these mobility approaches (i.e.,
>>    a host-based mobility scheme, network-based mobility scheme, and
>>    distributed mobility scheme) and a hybrid approach of a combination
>>    of them need to provide an efficient mobility service to vehicles
>>    moving fast and moving along with the relatively predictable
>>    trajectories along the roadways.
>>
>>    In vehicular networks, the control plane can be separated from the
>>    data plane for efficient mobility management and data forwarding by
>>    using the concept of Software-Defined Networking (SDN)
>>    [RFC7149][DMM-FPC].  Note that Forwarding Policy Configuration (FPC)
>>    in [DMM-FPC], which is a flexible mobility management system, can
>>    manage the separation of data-plane and control-plane in DMM.  In
>>    SDN, the control plane and data plane are separated for the efficient
>>    management of forwarding elements (e.g., switches and routers) where
>>    an SDN controller configures the forwarding elements in a centralized
>>    way and they perform packet forwarding according to their forwarding
>>    tables that are configured by the SDN controller.  An MA as an SDN
>>    controller needs to efficiently configure and monitor its IP-RSUs and
>>    vehicles for mobility management, location management, and security
>>    services.
>>
>>    The mobility information of a GPS receiver mounted in its vehicle
>>    (e.g., position, speed, and direction) can be used to accommodate
>>    mobility-aware proactive handover schemes, which can perform the
>>    handover of a vehicle according to its mobility and the wireless
>>    signal strength of a vehicle and an IP-RSU in a proactive way.
>>
>>    Vehicles can use the TCC as their Home Network having a home agent
>>    for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5213],
>>    so the TCC (or an MA inside the TCC) maintains the mobility
>>    information of vehicles for location management.  IP tunneling over
>>    the wireless link should be avoided for performance efficiency.
>>    Also, in vehicular networks, asymmetric links sometimes exist and
>>    must be considered for wireless communications such as V2V and V2I.
>>
>> >>>  This is all very informative text but does not state a problem. Is
>> there a
>> problem is left to be solved or are we assessing the applicability of
>> protocols? Could it for instance, forward point to issues discussed in
>> section
>> 5?
>>
>> <snip>
>>
>>    As shown in Figure 3, as internal networks, a vehicle's moving
>>    network and an EN's fixed network are self-contained networks having
>>    multiple subnets and having an edge router (e.g., IP-OBU and IP-RSU)
>>    for the communication with another vehicle or another EN.  The
>>    internetworking between two internal networks via V2I communication
>>    requires the exchange of the network parameters and the network
>>    prefixes of the internal networks.  For the efficiency, the network
>>    prefixes of the internal networks (as a moving network) in a vehicle
>>    need to be delegated and configured automatically.  Note that a
>>    moving network's network prefix can be called a Mobile Network Prefix
>>    (MNP) [OMNI].
>>
>> >>> Then again you=E2=80=99re overselling OMNI. MNP is originally define=
d here
>> https://datatracker.ietf.org/doc/html/rfc3963#section-2 and that=E2=80=
=99s a
>> reference
>> you can use normatively.
>>
>> <snip>
>>
>>    As shown in Figure 3, the addresses used for IPv6 transmissions over
>>    the wireless link interfaces for IP-OBU and IP-RSU can be either
>>    global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets can be
>>    routed within vehicular networks [OMNI].
>>
>> >>> Then again you=E2=80=99re overselling OMNI. There needs to  be a rou=
ting
>> protocol
>> like a MANET that will accept to carry the
>>  MNPs, and that must be implemented by the infra and both cars. The OMNI
>> spec
>>  is clear on that. This is why at first glance I see OMNI as a full mobi=
le
>>  router in a bump in the stack. Now what is the problem behind this? No
>> such
>>  protocol at IETF? Too many to choose from? No deployment?
>> <snip>
>>
>> When global IPv6 addresses
>>    are used, wireless interface configuration and control overhead for
>>    Duplicate Address Detection (DAD) [RFC4862] and Multicast Listener
>>    Discovery (MLD) [RFC2710][RFC3810] should be minimized to support V2I
>>    and V2X communications for vehicles moving fast along roadways; when
>>    ULAs and the OMNI interface are used, no DAD nor MLD messaging is
>>    needed.
>>
>> >>> Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it the no =
dad needed a
>> property
>> of injecting a BYOA in the fabric for an GUA MIP Home Address which is
>> known to
>> be unique at home? >>> OTOH, autoconf=E2=80=99ing a random ULA =E2=80=9C=
FD=E2=80=A6=E2=80=9Dprefix has
>> lesser
>> DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classic=
al
>> subnet. So
>> who says DAD isn=E2=80=99t required for OMNI ULA? >>> note that IMHO DAD=
 on
>> wireless is
>> a lot more harm than good, and I agree that with a good pseudo random
>> generator
>> the ULA has no chance to collision in the real world, as OMNI claims.
>> It=E2=80=99s just
>> that your argument here plays the other way, because there are less
>> random bits
>> (56)  in the ULA prefix than in the IID (62), and if one starts using mo=
re
>> prefix bits to be non-random, there will be a time when DAD on prefix is
>> needed.
>>
>> <snip>
>>
>>    Let us consider the upload/download time of a vehicle when it passes
>>    through the wireless communication coverage of an IP-RSU.  For a
>>    given typical setting where 1km is the maximum DSRC communication
>>    range [DSRC] and 100km/h is the speed limit in highway, the dwelling
>>    time can be calculated to be 72 seconds by dividing the diameter of
>>    the 2km (i.e., two times of DSRC communication range where an IP-RSU
>>    is located in the center of the circle of wireless communication) by
>>    the speed limit of 100km/h (i.e., about 28m/s).  For the 72 seconds,
>>    a vehicle passing through the coverage of an IP-RSU can upload and
>>    download data packets to/from the IP-RSU.
>>
>> <snip>
>>
>> 4.3.  V2V-based Internetworking
>>
>> >>> In this section it looks like the cars are in a stable line of sight
>> relationship. Which is probably fine for a platoon, but when you drive
>> along
>> with friends in different cars, you realize that the line of sight
>> assumption
>> does not stand over time. Soon enough, other cars meddle in, and possibl=
y
>> one
>> of the cars drives faster and too far ahead so you need the infra to
>> relay,
>> possibly over multiple infra hops.
>>
>> >>> so in this section, I=E2=80=99d expect to see a Vehicle communicatin=
g with
>> another
>> one and using either line of sight or V2V relaying but also using relay
>> via V2I
>> (multihop I2I not just hub and spoke V2I2V ), alternatively to together
>> for
>> redundancy. Is that part of the problem?
>>
>> >>> reading deeper section 5 I found excellent text on routing via V and
>> via I.
>> This tells that section 4 does not play a good role at justifying sectio=
n
>> 5.
>> Maybe keep section 4 for another doc?
>>
>> >>> What kind or reliability is required in a V2V use case? Do you think
>> ND can
>> handle it? Or MANET? What would be the assumption on L2 (roaming time,
>> unicast
>> vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3
>> redundancy?
>>
>> <snip>
>>
>> 5.  Problem Statement
>>
>> <snip>
>>
>>    In order to specify protocols using the architecture mentioned in
>>    Section 4.1, IPv6 core protocols have to be adapted to overcome
>>    certain challenging aspects of vehicular networking.  Since the
>>    vehicles are likely to be moving at great speed, protocol exchanges
>>    need to be completed in a time relatively short compared to the
>>    lifetime of a link between a vehicle and an IP-RSU, or between two
>>    vehicles.
>>
>> >>> Any order of magnitude?
>> >>> Can you indicate whether this already rules out certain procedures,
>> e.g.
>> DAD ?
>>
>>    The lifetime of a session varies depending on the session's type such
>>    as a web surfing, voice call over IP, and DNS query.  Regardless of a
>>    session's type, to guide all the IPv6 packets to their destination
>>    host, IP mobility should be supported for the session.
>>
>> >>> this seems to be for unicast when you know who to talk to. Is there =
a
>> need
>> some multicast groups like anybody around interested in topic blah like =
I
>> could
>> be multicasting the speed of vehicles coming the other way that I crosse=
d
>> recently, for use of vehicles that I=E2=80=99m crossing now, so they can=
 see a
>> slowdown
>> on advance
>>
>>    Thus, the time constraint of a wireless link has a major impact on
>>    IPv6 Neighbor Discovery (ND).  Mobility Management (MM) is also
>>    vulnerable to disconnections that occur before the completion of
>>    identity verification and tunnel management.  This is especially true
>>    given the unreliable nature of wireless communication.  This section
>>    presents key topics such as neighbor discovery and mobility
>>    management.
>>
>> >>> Only ND? What about the MANET?
>> >>> how fast should ND be to be suitable?
>> >>> is there also a bandwidth check? You can make things much faster if
>> you
>> dedicate a lot of spectrum to it. But that can also be a waste.
>>
>> 5.1.  Neighbor Discovery
>>
>> <snip>
>>
>>    The requirements for IPv6 ND for vehicular networks are efficient DAD
>>    and NUD operations.
>>
>> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast=
,
>> which
>> is a good idea in my book?
>>
>>  <snip>
>>
>>       This merging and partitioning should be considered for the
>>    IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAAC)
>>    [RFC4862].
>>
>> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast=
,
>> which
>> is a good idea in my book?
>>
>>  <snip>
>>
>>    Also, the partitioning of a VANET may make vehicles with the same
>>    prefix be physically unreachable.  Also, SLAAC needs to prevent IPv6
>>    address duplication due to the merging of VANETs.  According to the
>>    merging and partitioning, a destination vehicle (as an IPv6 host)
>>    needs to be distinguished as either an on-link host or an off-link
>>    host even though the source vehicle uses the same prefix as the
>>    destination vehicle.
>>
>> >>> should reference to draft-nordmark-intarea-ippl
>>
>>    To efficiently prevent IPv6 address duplication due to the VANET
>>    partitioning and merging from happening in vehicular networks, the
>>    vehicular networks need to support a vehicular-network-wide DAD by
>>    defining a scope that is compatible with the legacy DAD.  In this
>>    case, two vehicles can communicate with each other when there exists
>>    a communication path over VANET or a combination of VANETs and IP-
>>    RSUs, as shown in Figure 1.  By using the vehicular-network-wide DAD,
>>    vehicles can assure that their IPv6 addresses are unique in the
>>    vehicular network whenever they are connected to the vehicular
>>    infrastructure or become disconnected from it in the form of VANET.
>>
>> >>> Excellent
>>
>>    ND time-related parameters such as router lifetime and Neighbor
>>    Advertisement (NA) interval need to be adjusted for vehicle speed and
>>    vehicle density.  For example, the NA interval needs to be
>>    dynamically adjusted according to a vehicle's speed so that the
>>    vehicle can maintain its neighboring vehicles in a stable way,
>>    considering the collision probability with the NA messages sent by
>>    other vehicles.
>>
>> >>> Is that a problem or just an operational setting that needs to be
>> found?
>> >>> Do we need to reconsider the concepts of those timers?
>>
>> <snip>
>>
>>    Thus, in IPv6-based vehicular networking, IPv6 ND should have minimum
>>    changes for the interoperability with the legacy IPv6 ND used in the
>>    Internet, including the DAD and NUD operations.
>>
>> >>> I do not find the logical link with the text before, why is this a
>> =E2=80=9Cthus=E2=80=9D?
>> >>> why should the ND inside the VANET be constrained to be
>> interoperable? This
>> may place constraints on the solution.
>>
>> 5.1.1.  Link Model
>>
>>    A prefix model for a vehicular network needs to facilitate the
>>
>> >>> Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=80=9C=
prefix model=E2=80=9D.
>> >>> it would make this piece and the next should refer to
>> draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both
>> link
>> and subnet issues. The general ideas are the same, but the gory details
>> here
>> are slightly incorrect, like this notion of prefix model than comes out
>> of the
>> blue. The model is really the subnet model for the subnet associated to
>> P2MP.
>>
>>    communication between two vehicles with the same prefix regardless of
>>    the vehicular network topology as long as there exist bidirectional
>>    E2E paths between them in the vehicular network including VANETs and
>>    IP-RSUs.  This prefix model allows vehicles with the same prefix to
>>    communicate with each other via a combination of multihop V2V and
>>    multihop V2I with VANETs and IP-RSUs.  Note that the OMNI interface
>>    supports an NBMA link model where multihop V2V and V2I communications
>>    use each mobile node's ULAs without need for any DAD or MLD
>>    messaging.
>>
>> >>> again overselling OMNI.
>> >>> I kinda agree about the OMNI interface model, nothing against that.
>> But you
>> must see that there needs a lot more than what the OMNI interface to get
>> packets across V and I hops to the destination. Like routing ala MANET,
>> redundancy handling ala DetNet because it will be very lossy, path
>> management
>> ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND s=
o it does
>> not
>> solve the ND problems above.
>>
>>    IPv6 protocols work under certain assumptions that do not necessarily
>>    hold for vehicular wireless access link types other than OMNI/NBMA
>>    [VIP-WAVE][RFC5889]; the rest of this section discusses implications
>>    for those link types that do not apply when the OMNI/NBMA link model
>>
>> >>> again overselling OMNI.
>> >>> The keyword here is P2MP / NBMA, and OMNI is one interface that
>> accepts
>> that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already =
P2MP /
>> NBMA,
>> using routing to complete the partial mesh in P2MP. The text seems to
>> imply
>> that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI=
 is
>> loaded with
>> other stuff than a plain P2MP capable interface. And ND over P2MP is not
>> done
>> by OMNI, OMNI only makes classical ND worse and only works in a full
>> mesh. OTOH
>> RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work
>> very well
>> within an OMNI interface and solve those problems. >>> My point is that
>> you
>> need to tell the full story or refrain from entering solution space in
>> this doc
>>
>> <snip>
>>
>>    There is a relationship between a link and a prefix, besides the
>>    different scopes that are expected from the link-local and global
>>    types of IPv6 addresses.  In an IPv6 link, it is assumed that all
>>    interfaces which are configured with the same subnet prefix and with
>>    on-link bit set can communicate with each other on an IPv6 link.
>>
>> >>> not assumed; that=E2=80=99s what the onlink but set tells. The concl=
usion
>> should be
>> that the VANET cannot set the O bit.
>>
>>    However, the vehicular link model needs to define the relationship
>>    between a link and a prefix, considering the dynamics of wireless
>>    links and the characteristics of VANET.
>>
>> <snip>
>>
>>    From the previous observation, a vehicular link model should consider
>>    the frequent partitioning and merging of VANETs due to vehicle
>>    mobility.  Therefore, the vehicular link model needs to use an on-
>>    link prefix and off-link prefix according to the network topology of
>>    vehicles such as a one-hop reachable network and a multihop reachable
>>
>> >>> No, the once a node saw a O bit set that sticks even if it sees othe=
r
>> advertisements of the PIO with the O bit not set. >>> This is a global a=
nd
>> intrinsic property of the prefix (and an attack vector that could be
>> mentioned
>> in the sec section). >>> the VANET prefix must never come with the O bit
>> set.
>>
>> <snip>
>>
>>    network (or partitioned networks).  If the vehicles with the same
>>    prefix are reachable from each other in one hop, the prefix should be
>>    on-link.
>>
>> >>>> No, see above; but the router may redirect though it is really risk=
y
>> unless this is a stable situation like a parking place.
>>
>>    Thus, in IPv6-based vehicular networking, the vehicular link model
>>    should have minimum changes for interoperability with standard IPv6
>>    links in an efficient fashion to support IPv6 DAD, MLD and NUD
>>    operations.  When the OMNI NBMA link model is used, there are no link
>>    model changes nor DAD/MLD messaging required.
>>
>> >>>> again overselling OMNI.
>> >>>> You need a good P2MP subnet model with routing support when the mes=
h
>> is
>> partial. My company alone has been shipping million of nodes that build
>> subnets
>> of thousands, and that was done using IETF standards.
>>
>> <snip>
>>
>>    For vehicular networks with high mobility and density, the DAD needs
>>    to be performed efficiently with minimum overhead so that the
>>    vehicles can exchange a driving safety message (e.g., collision
>>    avoidance and accident notification) with each other with a short
>>    interval (e.g., 0.5 second) by a technical report from NHTSA
>>    (National Highway Traffic Safety Administration) [NHTSA-ACAS-Report].
>>    Such a driving safety message may include a vehicle's mobility
>>    information (i.e., position, speed, direction, and acceleration/
>>    deceleration).  The exchange interval of this message is 0.5 second,
>>    which is required to allow a driver to avoid a rear-end crash from
>>    another vehicle.
>>
>> >>> IPv6 over broadcast MAC (used to be called internet 0, 10+ years ago=
)
>> solves that MAC issue since there is no MAC.
>>
>> 5.1.3.  Routing
>>
>>    For multihop V2V communications in either a VANET or VANETs via IP-
>>    RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing protocol may
>>    be required to support both unicast and multicast in the links of the
>>    subnet with the same IPv6 prefix.  However, it will be costly to run
>>    both vehicular ND and a vehicular ad hoc routing protocol in terms of
>>    control traffic overhead [ID-Multicast-Problems].
>>
>> >>> we do that with IETF standards on battery operated devices already.
>> Using
>> RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve =
seen 30
>> hops in
>> meshes of thousands in the real world though it=E2=80=99s not the normal
>> operational
>> model, but can happen to maintain connectivity during the reboot of a
>> root) and
>> does not use broadcast. RPL was initially designed as a V2V2V protocol b=
ut
>> found its market on the IoT. I=E2=80=99m sure the protocol would gladly =
come back
>> to
>> its roots.
>>
>>    A routing protocol for a VANET may cause redundant wireless frames in
>>    the air to check the neighborhood of each vehicle and compute the
>>    routing information in a VANET with a dynamic network topology
>>    because the IPv6 ND is used to check the neighborhood of each
>>    vehicle.  Thus, the vehicular routing needs to take advantage of the
>>    IPv6 ND to minimize its control overhead.
>>
>> >>> A clean description of the interaction of RPL and RFC 8505 in our Io=
T
>> networks. Note that the speed of the PHY in VANET balanced the
>> instability of
>> the topology, and RPL still applies. Note also that RPL uses DV with a
>> routing
>> stretch in order to minimize the topology awareness that=E2=80=99s neede=
d in each
>> node,
>> which results in minimal signaling.
>>
>> 5.2.  Mobility Management
>>
>> <snip>
>>
>>    For a mobility management scheme in a shared link, where the wireless
>>    subnets of multiple IP-RSUs share the same prefix, an efficient
>>    vehicular-network-wide DAD is required.  If DHCPv6 is used to assign
>>    a unique IPv6 address to each vehicle in this shared link,
>>
>> >>> I would not use the term link, or shared. Maybe shared link -> domai=
n?
>> <snip>
>>
>> the DAD is
>>    not required.  On the other hand, for a mobility management scheme
>>    with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] and OMNI
>>    [OMNI]), DAD is not required because the IPv6 address of a vehicle's
>>    external wireless interface is guaranteed to be unique.
>>
>> >>> again overselling OMNI
>> >>> As I said earlier, this is wring there are (64*) more chances of a
>> collision in OMNI prefixes than in IPv6 IIDs. >>> OMNI prefixes can
>> collision,
>> home addresses that are unique on a home network cannot. >>> Now if both
>> the
>> OMNI prefix and the IID are good randoms, then obviously, the chances of
>> collisions round up to 0. >>> Collision is certainly not my worst fear.
>>
>>   There is a
>>    tradeoff between the prefix usage efficiency and DAD overhead.  Thus,
>>    the IPv6 address autoconfiguration for vehicular networks needs to
>>    consider this tradeoff to support efficient mobility management.
>>
>> >>> This is way too superficial and hides the reality of things.
>> - Using a VANET Infra prefix allows direct routability to the internet
>> which
>> BYOA does not since the BYOA is not topologically correct. Yes, it costs
>> a DAD
>> with classic ND, but it does not with RCF8505 and the draft fails to
>> mention
>> that. - A BYOA needs a tunnel home, and the node needs to know who is
>> reachable
>> inside the VANET and what is not to decide to tunnel or not; this is a
>> difficult problem (vs. control place overhead) that is not discussed her=
e.
>>
>> <snip>
>>
>>    For the case of a multihomed network, a vehicle can follow the first-
>>    hop router selection rule described in [RFC8028].  That is, the
>>    vehicle should select its default router for each prefix by
>>    preferring the router that advertised the prefix.
>>
>> >>> Still router discovery (in and out) must be very fast. Thing of the =
RA
>> intervale in MIPv6. Is that sufficient? Too expensive?
>>
>> <snip>
>>
>> 6.  Security Considerations
>> >>> Any discussion on the security of classical ND and other operational
>> issues
>> (rfc6583) ?
>>
>> <snip>
>>
>>    Security and privacy are paramount in V2I, V2V, and V2X networking.
>>    Vehicles and infrastructure must be authenticated in order to
>>    participate in vehicular networking.  Also, in-vehicle devices (e.g.,
>>    ECU) and a driver/passenger's mobile devices (e.g., smartphone and
>>    tablet PC) in a vehicle need to communicate with other in-vehicle
>>    devices and another driver/passenger's mobile devices in another
>>    vehicle, or other servers behind an IP-RSU in a secure way.  Even
>>    though a vehicle is perfectly authenticated and legitimate, it may be
>>    hacked for running malicious applications to track and collect its
>>    and other vehicles' information.  In this case, an attack mitigation
>>    process may be required to reduce the aftermath of malicious
>>    behaviors.
>>
>> >>> The section should mention that both with classical ND and BYOA,
>> addresses
>> can be impersonated, and RFC 8928 protects against that in both cases
>> while
>> maintaining privacy.
>>
>>    Even though vehicles can be authenticated with valid certificates by
>>    an authentication server in the vehicular cloud, the authenticated
>>
>> >>> Is PKI feasible (deploying it in every car?). Is it fast enough? Is =
it
>> really what IPWAVE thinks vehicle should use????? >>> e.g. why would one
>> need
>> to authenticate to a V2I network? >>> from the text earlier in the doc, =
it
>> seemed that what you really want is access that is fast to join, capable
>> of
>> offering the reachability you want, anonymous, and innocuous (cars can
>> not harm
>> one another).
>>
>>    vehicles may harm other vehicles, so their communication activities
>>    need to be logged in either a central way through a logging server
>>    (e.g., TCC) in the vehicular cloud or a distributed way (e.g.,
>>    blockchain [Bitcoin]) along with other vehicles or infrastructure.
>>    For the non-repudiation of the harmful activities of malicious nodes,
>>    a blockchain technology can be used [Bitcoin].  Each message from a
>>    vehicle can be treated as a transaction and the neighboring vehicles
>>    can play the role of peers in a consensus method of a blockchain
>>    [Bitcoin][Vehicular-BlockChain].  For a blockchain's efficient
>>    consensus in vehicular networks having fast moving vehicles, a new
>>    consensus algorithm needs to be developed or an existing consensus
>>    algorithm needs to be enhanced.
>>
>> >>> solution space; better express the  security needs since this is a P=
S.
>>
>> <snip>
>>
>>    To identify malicious vehicles among vehicles, an authentication
>>    method is required.
>>
>> >>> No. As said earlier a vehicle can be infected. You need
>> innocuousness.which
>> can come from things like isolation, zerotrust, and protocols that are
>> difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 i=
s
>> protected by construction, anonymous, and fast.
>>
>> <snip>
>>
>>    For the setup of a secure channel over IPsec or TLS, the multihop V2I
>>    communications over DSRC is required in a highway for the
>>    authentication by involving multiple intermediate vehicles as relay
>>    nodes toward an IP-RSU connected to an authentication server in the
>>    vehicular cloud.  The V2I communications over 5G V2X (or LTE V2X) is
>>    required to allow a vehicle to communicate directly with a gNodeB (or
>>    eNodeB) connected to an authentication server in the vehicular cloud.
>>
>> >>> solution space. Instead, you could mention that setting up secured
>> channels
>> between cars that cross one another might not complete in time to
>> establish the
>> communication channel, and that the innocuousness must come from
>> zerotrust in
>> the transactions between the cars.
>>    For the IPv6 ND, the DAD is required to ensure the uniqueness of the
>>    IPv6 address of a vehicle's wireless interface.
>>
>> >>> for classical ND (SLAAC) that=E2=80=99s true. That is not with RFC 8=
505,
>> since the
>> infra maintains a table of all addresses in use in the prefix and blocks
>> duplicates without the RFC 4862 DAD method. The stateful autoconf addres=
s
>> grant
>> is immediate.
>>
>>                                This DAD can be used
>>    as a flooding attack that uses the DAD-related ND packets
>>    disseminated over the VANET or vehicular networks.
>>
>> >>> also for DOS attacks. You can block a owner from using an address. A
>> reference to rfc6959 is much needed here.
>>
>> <snip>
>>
>>  This possibility
>>    indicates that the vehicles and IP-RSUs need to filter out suspicious
>>    ND traffic in advance.  Based on the SEND [RFC3971] mechanism, the
>>    authentication for routers (i.e., IP-RSUs) can be conducted by only
>>    selecting an IP-RSU that has a certification path toward trusted
>>    parties.  For authenticating other vehicles, the cryptographically
>>    generated address (CGA) can be used to verify the true owner of a
>>    received ND message, which requires to use the CGA ND option in the
>>    ND protocols.  For a general protection of the ND mechanism, the RSA
>>    Signature ND option can also be used to protect the integrity of the
>>    messages by public key signatures.  For a more advanced
>>    authentication mechanism, a distributed blockchain-based mechanism
>>    [Vehicular-BlockChain] can be used.
>>
>> >>> solution space. Again, the draft should focus on problems and needs.
>> The
>> problem here is that SEND is complex, and not implemented in the major
>> stack.
>> It relies on PKI for trusting the router. The V2I need is a zerotrust
>> model
>> where one V, the other local Vs, and the I, can help each other
>> anonymously and
>> harmlessly. <snip>
>>
>> 8.  Informative References
>>
>> >>> no normative reference?
>>
>> >>> no normative reference?
>>
>> <snip>
>>
>> Voila!
>>
>> Keep safe;
>>
>> Pascal
>>
>>
>>
>> _______________________________________________
>> its mailing list
>> its@ietf.org
>> https://www.ietf.org/mailman/listinfo/its
>>
>

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<div dir=3D"ltr">Thanks Paul for the review!<div><br></div><div>Pascal, wou=
ld it be possible for you to take a look and comment if you are happy with =
the new version?</div><div><br></div><div>Thanks!</div><div><br></div><div>=
Carlos</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"=
gmail_attr">On Mon, Aug 30, 2021 at 3:13 PM Mr. Jaehoon Paul Jeong &lt;<a h=
ref=3D"mailto:jaehoon.paul@gmail.com">jaehoon.paul@gmail.com</a>&gt; wrote:=
<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,=
204,204);padding-left:1ex"><div dir=3D"ltr">Hi Pascal,<div>Here is the revi=
sion (-21) of IPWAVE PS Draft:</div><div><a href=3D"https://datatracker.iet=
f.org/doc/html/draft-ietf-ipwave-vehicular-networking-21" target=3D"_blank"=
>https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networki=
ng-21</a><br></div><div><br></div><div>I attach the revision letter to show=
 how I have addressed your comments on the revision.</div><div><br></div><d=
iv>Chris and I have worked for this revision together.</div><div><br></div>=
<div>If you have further comments, please let me know.</div><div><br></div>=
<div>Thanks.</div><div><br></div><div>Best Regards,</div><div>Paul</div><di=
v><br></div><div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D=
"ltr" class=3D"gmail_attr">On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert v=
ia Datatracker &lt;<a href=3D"mailto:noreply@ietf.org" target=3D"_blank">no=
reply@ietf.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:sol=
id;border-left-color:rgb(204,204,204);padding-left:1ex">Reviewer: Pascal Th=
ubert<br>
Review result: Not Ready<br>
<br>
Dear authors<br>
<br>
In summary:<br>
<br>
I read a number of very good drafts collated in one, from the use cases tha=
t<br>
very complete and ready to publish, to the architecture and protocol soluti=
on<br>
in section 4 that would require more work for completeness.<br>
<br>
There are multiple instances in the use cases where protocols are listed co=
ming<br>
out of the blue, e.g., the references to OMNI that seem artificially spread=
<br>
regardless of the context of the section. OMNI is used throughout, both as =
an<br>
open ended toolbox, and as a carpet under which all problems can be hidden.=
<br>
<br>
Reading this doc, OMNI shows as an interface to a software mobile router, w=
ith<br>
multiple of the device physical interfaces connected to the mobile router. =
This<br>
makes the stack very simple as the complexity moves to the router. But now =
you<br>
have to implement the router. Presented as that, the OMNI router deserves i=
ts<br>
name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANET (=
many to<br>
choose from) and NEMO (and all the MIP protocol family across address<br>
families), all the possible radio interfaces on which the ND problems go aw=
ay<br>
by magic, and whatever else you want to put in there. Is that the intention=
?<br>
<br>
Instead of referring to OMNI for virtually anything, the doc should refer t=
o<br>
MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),<br>
draft-nordmark-intarea-ippl for split subnets, and<br>
draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet models.=
 And<br>
then you can say that all those components can be plugged in the OMNI route=
r,<br>
and you can discuss which MANET and which MIP you want, including using OMN=
I=E2=80=99s<br>
built in mobility.<br>
<br>
Note that my objections are not against the OMNI design, it might be the<br=
>
perfect thing and I am already aware of use cases that could be served by a=
<br>
P2MP interface like OMNI in conjunction with RFC8505 on the P2P subinterfac=
es<br>
(recycling the high level design we=E2=80=99ve been shipping for IPv4 / fra=
me relay for<br>
the last 30 years). My objection is of the way the draft uses [OMNI] as the=
<br>
magic wand that solves all the problems when what you really do is throw th=
em<br>
over the fence. I=E2=80=99d rather you focus on problems and use cases, for=
 which<br>
there=E2=80=99s excellent text, and indicate what needs to be done without =
making<br>
assumption on how the needful things will be solved.<br>
<br>
In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to spl=
it, keep all<br>
that=E2=80=99s use case and problem description and ship it, remove referen=
ces to<br>
protocols envisioned in the solution, and start the work on architecture of=
 the<br>
solution and the protocol applicability statements separately. An alternate=
<br>
would be to centralize the discussion on protocols to annex, and explain th=
at<br>
protocol A or B could be envisioned in solution space because to over this =
gap<br>
or implement that function.<br>
<br>
In any fashion, the current text is not ready for publication as applicabil=
ity<br>
statement, architecture and or/solution, so the related work should be remo=
ved<br>
from the main text. But I find it mostly ready for use case and problem<br>
statement, more below.<br>
<br>
Review:<br>
<br>
Abstract<br>
<br>
=C2=A0 =C2=A0This document discusses the problem statement and use cases of=
<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for Intelligent Transportation=
<br>
=C2=A0 =C2=A0Systems (ITS).<br>
<br>
&gt;&gt;&gt; The document goes beyond that; there was actually a thread at =
6MAN where<br>
Bob Hinden said =E2=80=9C This document says it is a problem statement, but=
 then<br>
becomes a solution document.=C2=A0 =C2=A0Might be better to cut it down to =
only the<br>
problem statement part. =E2=80=9C &gt;&gt;&gt; Would you consider doing thi=
s? If not, why? Note:<br>
you may want to respond on 6MAN as well. &gt;&gt;&gt; &gt;&gt;&gt;I would h=
ave thought that the<br>
traditional steps of problem statement and applicability statement of exist=
ing<br>
work could be expected from IPWAVE too. &gt;&gt;&gt; Please clarify the ste=
ps that you<br>
intend to follow next with this work.<br>
<br>
&lt;snip&gt;<br>
<br>
1.=C2=A0 Introduction<br>
<br>
&gt;&gt;&gt; Very readable and informative section, many thanks!<br>
<br>
=C2=A0 =C2=A0Along with these WAVE standards and C-V2X standards, regardles=
s of a<br>
=C2=A0 =C2=A0wireless access technology under the IP stack of a vehicle, ve=
hicular<br>
=C2=A0 =C2=A0networks can operate IP mobility with IPv6 [RFC8200] and Mobil=
e IPv6<br>
=C2=A0 =C2=A0protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (P=
MIPv6)<br>
=C2=A0 =C2=A0[RFC5213], Distributed Mobility Management (DMM) [RFC7333], Lo=
cator/<br>
=C2=A0 =C2=A0ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Ext=
ended<br>
=C2=A0 =C2=A0Route Optimization (AERO) [RFC6706BIS]).<br>
<br>
&gt;&gt;&gt; NEMO (RFC 3963) is not cited. Any reason why the vehicle would=
 not<br>
transport a network?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0This document describes use cases and a problem statement abou=
t<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for ITS, which is named IPv6 W=
ireless<br>
=C2=A0 =C2=A0Access in Vehicular Environments (IPWAVE).=C2=A0 First, it int=
roduces the<br>
=C2=A0 =C2=A0use cases for using V2V, V2I, and V2X networking in ITS.=C2=A0=
 Next, for<br>
=C2=A0 =C2=A0IPv6-based vehicular networks, it makes a gap analysis of curr=
ent<br>
=C2=A0 =C2=A0IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Manage=
ment,<br>
=C2=A0 =C2=A0and Security &amp; Privacy), and then enumerates requirements =
for the<br>
=C2=A0 =C2=A0extensions of those IPv6 protocols, which are tailored to IPv6=
-based<br>
=C2=A0 =C2=A0vehicular networking.=C2=A0 Thus, this document is intended to=
 motivate<br>
=C2=A0 =C2=A0development of key protocols for IPWAVE.<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
2.=C2=A0 Terminology<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0o=C2=A0 IP-OBU: &quot;Internet Protocol On-Board Unit&quot;: A=
n IP-OBU denotes a<br>
=C2=A0 =C2=A0 =C2=A0 computer situated in a vehicle (e.g., car, bicycle, au=
tobike,<br>
=C2=A0 =C2=A0 =C2=A0 motor cycle, and a similar one) and a device (e.g., sm=
artphone and<br>
=C2=A0 =C2=A0 =C2=A0 IoT device).=C2=A0 It has at least one IP interface th=
at runs in IEEE<br>
=C2=A0 =C2=A0 =C2=A0 802.11-OCB and has an &quot;OBU&quot; transceiver.=C2=
=A0 Also, it may have an IP<br>
=C2=A0 =C2=A0 =C2=A0 interface that runs in Cellular V2X (C-V2X) [TS-23.285=
-3GPP]<br>
=C2=A0 =C2=A0 =C2=A0 [TR-22.886-3GPP][TS-23.287-3GPP].=C2=A0 See the defini=
tion of the term<br>
=C2=A0 =C2=A0 =C2=A0 &quot;OBU&quot; in [RFC8691].<br>
<br>
&gt;&gt;&gt; Can that be a router connecting multiple computers?<br>
<br>
&lt;snip&gt;<br>
<br>
3.=C2=A0 Use Cases<br>
<br>
&gt;&gt;&gt; This is another great read and an enlightening section. Maybe =
mention in<br>
the abstract that the doc also covers use cases?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Although a Layer-2 solution can provide a support for multihop=
<br>
=C2=A0 =C2=A0communications in vehicular networks, the scalability issue re=
lated<br>
=C2=A0 =C2=A0to multihop forwarding still remains when vehicles need to<br>
=C2=A0 =C2=A0disseminate or forward packets toward multihop-away destinatio=
ns.=C2=A0 In<br>
=C2=A0 =C2=A0addition, the IPv6-based approach for V2V as a network layer p=
rotocol<br>
=C2=A0 =C2=A0can accommodate multiple radio technologies as MAC protocols, =
such as<br>
=C2=A0 =C2=A05G V2X and DSRC.=C2=A0 Therefore, the existing IPv6 protocol c=
an be<br>
=C2=A0 =C2=A0augmented through the addition of an Overlay Multilink Network=
 (OMNI)<br>
=C2=A0 =C2=A0Interface [OMNI] and/or protocol changes in order to support b=
oth<br>
=C2=A0 =C2=A0wireless single-hop/multihop V2V communications and multiple r=
adio<br>
=C2=A0 =C2=A0technologies in vehicular networks.=C2=A0 In such a way, vehic=
les can<br>
=C2=A0 =C2=A0communicate with each other by V2V communications to share eit=
her an<br>
=C2=A0 =C2=A0emergency situation or road hazard in a highway having multipl=
e kinds<br>
=C2=A0 =C2=A0of radio technologies, such as 5G V2X and DSRC.<br>
<br>
&gt;&gt;&gt; This text appears in the middle of high level use case, with a=
 crude list<br>
of protocols; this is not a place for it<br>
<br>
&gt;&gt;&gt; On a 6MAN Thread, Brian Carpenter said that the above:<br>
=E2=80=9C<br>
is of concern regardless of the mention of OMNI. Does it mean &quot;can be&=
quot; or<br>
&quot;needs to be&quot;? This paragraph seems like a very short summary of =
a big problem<br>
area. At the end of page 13 there is some related discussion, which mention=
s<br>
RPL as part of the solution (good choice, IMHO) but again seems to depend o=
n<br>
OMNI. I don&#39;t think the fix of simply removing references to OMNI works=
,<br>
because it would leave a gap. In an informational document, that is not a<b=
r>
formal problem but as far as this draft describes architecture, I don&#39;t=
 think<br>
that big a gap is reasonable. &quot;OMNI&quot; is mentioned more than 20 ti=
mes in the<br>
document. There are also several references to AERO, which is strongly<br>
associated with OMNI. =E2=80=9C &gt;&gt;&gt; I agree with Brian. Here the d=
ocument seems to be<br>
mixing solution with problem and putting the cart before the horse. My<br>
recommendation is to stick to what needs to be done that IPv6 does not do y=
et<br>
-the reqs and gaps-; but the doc should not step in the how things will be =
done<br>
unless the group already decided to do it. The logical next steps to a PS a=
re<br>
an applicability statement of existing work, and if the gaps cannot be fill=
ed,<br>
there may be one or more WG chartered to fill those gaps.<br>
<br>
&gt;&gt;&gt; I=E2=80=99d still be happy to see an annex with leads on where=
 the solution might<br>
come from like RFC 8691 does.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2I communications in a highway where RSUs a=
re<br>
=C2=A0 =C2=A0sparsely deployed, so a vehicle can reach the wireless coverag=
e of an<br>
=C2=A0 =C2=A0RSU through the multihop data forwarding of intermediate vehic=
les.<br>
=C2=A0 =C2=A0Thus, IPv6 needs to be extended for multihop V2I communication=
s.<br>
<br>
&gt;&gt;&gt; Note that I have no clue on how well OMNI applies in that spac=
e, maybe it<br>
does very well; but here it comes out of the blue with no justification. If=
 you<br>
mention OMNI you need to detail what it is and which of the V2V=C2=A0 probl=
ems you<br>
expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2X (or V2I2X) communications in an urban ro=
ad<br>
=C2=A0 =C2=A0network where RSUs are deployed at intersections, so a vehicle=
 (or a<br>
=C2=A0 =C2=A0pedestrian&#39;s smartphone) can reach the wireless coverage o=
f an RSU<br>
=C2=A0 =C2=A0through the multihop data forwarding of intermediate vehicles =
(or<br>
=C2=A0 =C2=A0pedestrians&#39; smartphones).=C2=A0 Thus, IPv6 needs to be ex=
tended for<br>
=C2=A0 =C2=A0multihop V2X (or V2I2X) communications.<br>
<br>
&gt;&gt;&gt; Please be more specific on what the missing functions are and =
whether they<br>
are missing from the stack development standpoint or if there=E2=80=99s wor=
k needed<br>
from the IETF. 1)=C2=A0 =C2=A0 =C2=A0 If something is really missing in our=
 specs, the text to<br>
prove from the use case above is missing 2)=C2=A0 =C2=A0 =C2=A0 how OMNI se=
rves the use case<br>
could be elaborated in an applicability statement of OMNI for V2xyz, but it=
 is<br>
a bit blunt to present it as panacea when the problems to be solved are not=
<br>
listed. 3)=C2=A0 =C2=A0 =C2=A0 If you look at it, OMNI seems like a softwar=
e mobile router<br>
within a bump in the stack. Can that become too big?<br>
<br>
&gt;&gt;&gt; my view is that the text above and the similar occasions shoul=
d be replaced<br>
by something like :<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented to provide the fo=
llowing<br>
=C2=A0 =C2=A0functions: 1) =E2=80=A6<br>
<br>
&gt;&gt;&gt; and / or something like:<br>
<br>
=C2=A0 =C2=A0In addition to the IPv6 node requirements [RFC 8504], the IPv6=
 protocol<br>
=C2=A0 =C2=A0stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=
=A6<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To support applications of these V2X use cases, the functions =
of IPv6<br>
=C2=A0 =C2=A0such as VND, VMM, and VSP are prerequisites for IPv6-based pac=
ket<br>
=C2=A0 =C2=A0exchange, transport-layer session continuity, and secure, safe=
<br>
=C2=A0 =C2=A0communication between a vehicle and a pedestrian either direct=
ly or<br>
=C2=A0 =C2=A0indirectly via an IP-RSU.<br>
<br>
&gt;&gt;&gt; =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=
=9D does not parse. There=E2=80=99s<br>
no IPv6 reference that provides those functions. If the intention is to say=
<br>
that there=E2=80=99s stuff to add to IPv6 to support, like, say,=C2=A0 VND,=
 then this<br>
document fails to define how an IPv6 VND should behave, though it=E2=80=99s=
 precisely<br>
what I=E2=80=99d expect from a problem statement.<br>
<br>
&lt;snip&gt;<br>
<br>
4.=C2=A0 Vehicular Networks<br>
<br>
&gt;&gt;&gt; What is the purpose of section 4 as a whole, problem statement=
 or<br>
applicability statement of the listed protocols? In the former case what=E2=
=80=99s the<br>
problem? In the latter case it is incomplete and needs to be exported to an=
<br>
applicability statement doc with all the possible technologies evaluated.<b=
r>
<br>
=C2=A0 =C2=A0This section describes an example vehicular network architectu=
re<br>
=C2=A0 =C2=A0supporting V2V, V2I, and V2X communications in vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt; I read this as presenting a context to explain what the proble=
ms are<br>
instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe usin=
g the term<br>
=E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=99s =
comment.<br>
<br>
&lt;snip&gt;<br>
<br>
4.1.=C2=A0 Vehicular Network Architecture<br>
<br>
=C2=A0 =C2=A0Figure 1 shows an example vehicular network architecture for V=
2I and<br>
=C2=A0 =C2=A0V2V in a road network [OMNI].<br>
<br>
a.=C2=A0 =C2=A0 =C2=A0 Is using OMNI a decision that the WG made for the fu=
ture work ? what<br>
does it do and what does it not do? b.=C2=A0 =C2=A0 =C2=A0 Is there work le=
ft to be done? Who<br>
will do that work? Or is it the expectation that OMNI has it all defined<br=
>
already?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An existing network architecture (e.g., an IP-based aeronautic=
al<br>
=C2=A0 =C2=A0network architecture [OMNI][UAM-ITS], a network architecture o=
f<br>
=C2=A0 =C2=A0PMIPv6 [RFC5213], and a low-power and lossy network architectu=
re<br>
=C2=A0 =C2=A0[RFC6550]) can be extended to a vehicular network architecture=
 for<br>
=C2=A0 =C2=A0multihop V2V, V2I, and V2X, as shown in Figure 1.=C2=A0 In a h=
ighway<br>
=C2=A0 =C2=A0scenario, a vehicle may not access an RSU directly because of =
the<br>
=C2=A0 =C2=A0distance of the DSRC coverage (up to 1 km).=C2=A0 For example,=
 the OMNI<br>
=C2=A0 =C2=A0interface and/or RPL (IPv6 Routing Protocol for Low-Power and =
Lossy<br>
=C2=A0 =C2=A0Networks) [RFC6550] can be extended to support a multihop V2I =
since a<br>
=C2=A0 =C2=A0vehicle can take advantage of other vehicles as relay nodes to=
 reach<br>
=C2=A0 =C2=A0the RSU.=C2=A0 Also, RPL can be extended to support both multi=
hop V2V and<br>
=C2=A0 =C2=A0V2X in the similar way.<br>
<br>
&gt;&gt;&gt; all this could fit well in annex; anyway you need to explain w=
hat you<br>
expect the protocols to do and which extension is needed. In the case of RP=
L at<br>
least you indicate that it would do routing, but not why you cannot use it =
of<br>
the shelf; for OMNI, what you expect is less clear, though there=E2=80=99s =
text<br>
elsewhere about the many radio interfaces that could be used for the purpos=
e,<br>
and the text in the UAM below that is enlightening.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 To support not only the mobil=
ity<br>
=C2=A0 =C2=A0management of the UAM end systems, but also the multihop and<b=
r>
=C2=A0 =C2=A0multilink communications of the UAM interfaces, the UAM end sy=
stems<br>
=C2=A0 =C2=A0can employ an Overlay Multilink Network (OMNI) interface [OMNI=
] as a<br>
=C2=A0 =C2=A0virtual Non-Broadcast Multiple Access (NBMA) connection to a s=
erving<br>
=C2=A0 =C2=A0ground domain infrastructure.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; when connecting to a MANET it needs support for that MANET. The t=
ext<br>
above seems to imply that is solves everything in V2xyz like magic; reminds=
 me<br>
of the IPv6 multicast abstraction that was supposed to solve the broadcast<=
br>
problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 This infrastructure can be configured<br>
=C2=A0 =C2=A0over the underlying data links.=C2=A0 The OMNI interface and i=
ts link<br>
=C2=A0 =C2=A0model provide a means of multilink, multihop and mobility<br>
=C2=A0 =C2=A0coordination to the legacy IPv6 ND messaging [RFC4861] accordi=
ng to<br>
=C2=A0 =C2=A0the NBMA principle.=C2=A0 Thus, the OMNI link model can suppor=
t efficient<br>
=C2=A0 =C2=A0UAM internetworking services without additional mobility messa=
ging,<br>
=C2=A0 =C2=A0and without any modification to the IPv6 ND messaging services=
 or<br>
=C2=A0 =C2=A0link model.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; the text above seems to imply that is solves everything in V2xyz =
like<br>
magic; that would be a stretch, that reminds me of IPv6 multicast that was<=
br>
supposed to solve the broadcast problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Multiple vehicles under the coverage of an RSU share a prefix =
just as<br>
=C2=A0 =C2=A0mobile nodes share a prefix of a Wi-Fi access point in a wirel=
ess<br>
=C2=A0 =C2=A0LAN.=C2=A0 This is a natural characteristic in infrastructure-=
based<br>
=C2=A0 =C2=A0wireless networks.=C2=A0 For example, in Figure 1, two vehicle=
s (i.e.,<br>
=C2=A0 =C2=A0Vehicle2, and Vehicle5) can use Prefix 1 to configure their IP=
v6<br>
=C2=A0 =C2=A0global addresses for V2I communication.=C2=A0 Alternatively, m=
obile nodes<br>
=C2=A0 =C2=A0can employ an OMNI interface and use their own IPv6 Unique Loc=
al<br>
=C2=A0 =C2=A0Addresses (ULAs) [RFC4193] over the wireless network without<b=
r>
=C2=A0 =C2=A0requiring the messaging of IPv6 Stateless Address Autoconfigur=
ation<br>
=C2=A0 (SLAAC) [RFC4862], which uses an on-link prefix provided by the<br>
=C2=A0 =C2=A0(visited) wireless LAN; this technique is known as &quot;Bring=
-Your-Own-<br>
=C2=A0 =C2=A0Addresses&quot;.<br>
<br>
&gt;&gt;&gt;=C2=A0 Is OMNI the only way to &quot;Bring-Your-Own-Addresses=
=E2=80=9D? Else the text could be<br>
more generic, at least use e.g., like the ref to AERO later. &gt;&gt;&gt; W=
hat are the<br>
implications / limitations of doing that =E2=80=93 like they can do line of=
 sight V2V<br>
but not reach the internet, or the need of=C2=A0 a local MANET / RPL that w=
ill<br>
accept to route those addresses, or the security / address ownership valida=
tion<br>
issues ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0A single subnet prefix announced by an RSU can span multiple v=
ehicles<br>
=C2=A0 =C2=A0in VANET.=C2=A0 For example, in Figure 1, for Prefix 1, three =
vehicles<br>
=C2=A0 =C2=A0(i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a conne=
cted<br>
=C2=A0 =C2=A0VANET.=C2=A0 Also, for Prefix 2, two vehicles (i.e., Vehicle3 =
and<br>
=C2=A0 =C2=A0Vehicle6) can construct another connected VANET, and for Prefi=
x 3,<br>
=C2=A0 =C2=A0two vehicles (i.e., Vehicle4 and Vehicle7) can construct anoth=
er<br>
=C2=A0 =C2=A0connected VANET.=C2=A0 Alternatively, each vehicle could emplo=
y an OMNI<br>
=C2=A0 =C2=A0interface with their own ULAs such that no topologically-orien=
ted<br>
=C2=A0 =C2=A0subnet prefixes need be announced by the RSU.<br>
<br>
&gt;&gt;&gt;=C2=A0 same as above. This seems to restate the same thing, der=
ive an address<br>
from a topologically correct prefix or use your own with limitations to be<=
br>
described.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]<b=
r>
=C2=A0 =C2=A0specifies several details, including Maximum Transmission Unit=
 (MTU),<br>
=C2=A0 =C2=A0frame format, link-local address, address mapping for unicast =
and<br>
=C2=A0 =C2=A0multicast, stateless autoconfiguration, and subnet structure.=
=C2=A0 An<br>
=C2=A0 =C2=A0Ethernet Adaptation (EA) layer is in charge of transforming so=
me<br>
=C2=A0 =C2=A0parameters between the IEEE 802.11 MAC layer and the IPv6 netw=
ork<br>
=C2=A0 =C2=A0layer, which is located between the IEEE 802.11-OCB&#39;s logi=
cal link<br>
=C2=A0 =C2=A0control layer and the IPv6 network layer.=C2=A0 This IPv6 over=
 802.11-OCB<br>
=C2=A0 =C2=A0can be used for both V2V and V2I in IPv6-based vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt;=C2=A0 solution space.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An IPv6 mobility solution is needed for the guarantee of<br>
=C2=A0 =C2=A0communication continuity in vehicular networks so that a vehic=
le&#39;s<br>
=C2=A0 =C2=A0TCP session can be continued, or UDP packets can be delivered =
to a<br>
=C2=A0 =C2=A0vehicle as a destination without loss while it moves from an I=
P-RSU&#39;s<br>
=C2=A0 =C2=A0wireless coverage to another IP-RSU&#39;s wireless coverage.=
=C2=A0 In<br>
=C2=A0 =C2=A0Figure 1, assuming that Vehicle2 has a TCP session (or a UDP s=
ession)<br>
=C2=A0 =C2=A0with a corresponding node in the vehicular cloud, Vehicle2 can=
 move<br>
=C2=A0 =C2=A0from IP-RSU1&#39;s wireless coverage to IP-RSU2&#39;s wireless=
 coverage.=C2=A0 In<br>
=C2=A0 =C2=A0this case, a handover for Vehicle2 needs to be performed by ei=
ther a<br>
=C2=A0 =C2=A0host-based mobility management scheme (e.g., MIPv6 [RFC6275]) =
or a<br>
=C2=A0 =C2=A0network-based mobility management scheme (e.g., PMIPv6 [RFC521=
3] and<br>
=C2=A0 =C2=A0AERO [RFC6706BIS]).<br>
<br>
=C2=A0 =C2=A0In the host-based mobility scheme (e.g., MIPv6), an IP-RSU pla=
ys a<br>
=C2=A0 =C2=A0role of a home agent.=C2=A0 On the other hand, in the network-=
based<br>
=C2=A0 =C2=A0mobility scheme (e.g., PMIPv6, an MA plays a role of a mobilit=
y<br>
=C2=A0 =C2=A0management controller such as a Local Mobility Anchor (LMA) in=
<br>
=C2=A0 =C2=A0PMIPv6, which also serves vehicles as a home agent, and an IP-=
RSU<br>
=C2=A0 =C2=A0plays a role of an access router such as a Mobile Access Gatew=
ay<br>
=C2=A0 =C2=A0(MAG) in PMIPv6 [RFC5213].=C2=A0 The host-based mobility schem=
e needs<br>
=C2=A0 =C2=A0client functionality in IPv6 stack of a vehicle as a mobile no=
de for<br>
=C2=A0 =C2=A0mobility signaling message exchange between the vehicle and ho=
me<br>
=C2=A0 =C2=A0agent.=C2=A0 On the other hand, the network-based mobility sch=
eme does not<br>
=C2=A0 =C2=A0need such a client functionality for a vehicle because the net=
work<br>
=C2=A0 =C2=A0infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility =
agent<br>
=C2=A0 =C2=A0handles the mobility signaling message exchange with the home =
agent<br>
=C2=A0 =C2=A0(e.g., LMA in PMIPv6) for the sake of the vehicle.<br>
<br>
=C2=A0 =C2=A0There are a scalability issue and a route optimization issue i=
n the<br>
=C2=A0 =C2=A0network-based mobility scheme (e.g., PMIPv6) when an MA covers=
 a<br>
=C2=A0 =C2=A0large vehicular network governing many IP-RSUs.=C2=A0 In this =
case, a<br>
=C2=A0 =C2=A0distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate=
 the<br>
=C2=A0 =C2=A0scalability issue by distributing multiple MAs in the vehicula=
r<br>
=C2=A0 =C2=A0network such that they are positioned closer to vehicles for r=
oute<br>
=C2=A0 =C2=A0optimization and bottleneck mitigation in a central MA in the<=
br>
=C2=A0 =C2=A0network-based mobility scheme.=C2=A0 All these mobility approa=
ches (i.e.,<br>
=C2=A0 =C2=A0a host-based mobility scheme, network-based mobility scheme, a=
nd<br>
=C2=A0 =C2=A0distributed mobility scheme) and a hybrid approach of a combin=
ation<br>
=C2=A0 =C2=A0of them need to provide an efficient mobility service to vehic=
les<br>
=C2=A0 =C2=A0moving fast and moving along with the relatively predictable<b=
r>
=C2=A0 =C2=A0trajectories along the roadways.<br>
<br>
=C2=A0 =C2=A0In vehicular networks, the control plane can be separated from=
 the<br>
=C2=A0 =C2=A0data plane for efficient mobility management and data forwardi=
ng by<br>
=C2=A0 =C2=A0using the concept of Software-Defined Networking (SDN)<br>
=C2=A0 =C2=A0[RFC7149][DMM-FPC].=C2=A0 Note that Forwarding Policy Configur=
ation (FPC)<br>
=C2=A0 =C2=A0in [DMM-FPC], which is a flexible mobility management system, =
can<br>
=C2=A0 =C2=A0manage the separation of data-plane and control-plane in DMM.=
=C2=A0 In<br>
=C2=A0 =C2=A0SDN, the control plane and data plane are separated for the ef=
ficient<br>
=C2=A0 =C2=A0management of forwarding elements (e.g., switches and routers)=
 where<br>
=C2=A0 =C2=A0an SDN controller configures the forwarding elements in a cent=
ralized<br>
=C2=A0 =C2=A0way and they perform packet forwarding according to their forw=
arding<br>
=C2=A0 =C2=A0tables that are configured by the SDN controller.=C2=A0 An MA =
as an SDN<br>
=C2=A0 =C2=A0controller needs to efficiently configure and monitor its IP-R=
SUs and<br>
=C2=A0 =C2=A0vehicles for mobility management, location management, and sec=
urity<br>
=C2=A0 =C2=A0services.<br>
<br>
=C2=A0 =C2=A0The mobility information of a GPS receiver mounted in its vehi=
cle<br>
=C2=A0 =C2=A0(e.g., position, speed, and direction) can be used to accommod=
ate<br>
=C2=A0 =C2=A0mobility-aware proactive handover schemes, which can perform t=
he<br>
=C2=A0 =C2=A0handover of a vehicle according to its mobility and the wirele=
ss<br>
=C2=A0 =C2=A0signal strength of a vehicle and an IP-RSU in a proactive way.=
<br>
<br>
=C2=A0 =C2=A0Vehicles can use the TCC as their Home Network having a home a=
gent<br>
=C2=A0 =C2=A0for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5=
213],<br>
=C2=A0 =C2=A0so the TCC (or an MA inside the TCC) maintains the mobility<br=
>
=C2=A0 =C2=A0information of vehicles for location management.=C2=A0 IP tunn=
eling over<br>
=C2=A0 =C2=A0the wireless link should be avoided for performance efficiency=
.<br>
=C2=A0 =C2=A0Also, in vehicular networks, asymmetric links sometimes exist =
and<br>
=C2=A0 =C2=A0must be considered for wireless communications such as V2V and=
 V2I.<br>
<br>
&gt;&gt;&gt;=C2=A0 This is all very informative text but does not state a p=
roblem. Is there a<br>
problem is left to be solved or are we assessing the applicability of<br>
protocols? Could it for instance, forward point to issues discussed in sect=
ion<br>
5?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, as internal networks, a vehicle&#39;s mo=
ving<br>
=C2=A0 =C2=A0network and an EN&#39;s fixed network are self-contained netwo=
rks having<br>
=C2=A0 =C2=A0multiple subnets and having an edge router (e.g., IP-OBU and I=
P-RSU)<br>
=C2=A0 =C2=A0for the communication with another vehicle or another EN.=C2=
=A0 The<br>
=C2=A0 =C2=A0internetworking between two internal networks via V2I communic=
ation<br>
=C2=A0 =C2=A0requires the exchange of the network parameters and the networ=
k<br>
=C2=A0 =C2=A0prefixes of the internal networks.=C2=A0 For the efficiency, t=
he network<br>
=C2=A0 =C2=A0prefixes of the internal networks (as a moving network) in a v=
ehicle<br>
=C2=A0 =C2=A0need to be delegated and configured automatically.=C2=A0 Note =
that a<br>
=C2=A0 =C2=A0moving network&#39;s network prefix can be called a Mobile Net=
work Prefix<br>
=C2=A0 =C2=A0(MNP) [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. MNP is originally =
defined here<br>
<a href=3D"https://datatracker.ietf.org/doc/html/rfc3963#section-2" rel=3D"=
noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/html/rfc3963=
#section-2</a> and that=E2=80=99s a reference<br>
you can use normatively.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, the addresses used for IPv6 transmission=
s over<br>
=C2=A0 =C2=A0the wireless link interfaces for IP-OBU and IP-RSU can be eith=
er<br>
=C2=A0 =C2=A0global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets ca=
n be<br>
=C2=A0 =C2=A0routed within vehicular networks [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. There needs to=C2=
=A0 be a routing protocol<br>
like a MANET that will accept to carry the<br>
=C2=A0MNPs, and that must be implemented by the infra and both cars. The OM=
NI spec<br>
=C2=A0is clear on that. This is why at first glance I see OMNI as a full mo=
bile<br>
=C2=A0router in a bump in the stack. Now what is the problem behind this? N=
o such<br>
=C2=A0protocol at IETF? Too many to choose from? No deployment?<br>
&lt;snip&gt;<br>
<br>
When global IPv6 addresses<br>
=C2=A0 =C2=A0are used, wireless interface configuration and control overhea=
d for<br>
=C2=A0 =C2=A0Duplicate Address Detection (DAD) [RFC4862] and Multicast List=
ener<br>
=C2=A0 =C2=A0Discovery (MLD) [RFC2710][RFC3810] should be minimized to supp=
ort V2I<br>
=C2=A0 =C2=A0and V2X communications for vehicles moving fast along roadways=
; when<br>
=C2=A0 =C2=A0ULAs and the OMNI interface are used, no DAD nor MLD messaging=
 is<br>
=C2=A0 =C2=A0needed.<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it t=
he no dad needed a property<br>
of injecting a BYOA in the fabric for an GUA MIP Home Address which is know=
n to<br>
be unique at home? &gt;&gt;&gt; OTOH, autoconf=E2=80=99ing a random ULA =E2=
=80=9CFD=E2=80=A6=E2=80=9Dprefix has lesser<br>
DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classical =
subnet. So<br>
who says DAD isn=E2=80=99t required for OMNI ULA? &gt;&gt;&gt; note that IM=
HO DAD on wireless is<br>
a lot more harm than good, and I agree that with a good pseudo random gener=
ator<br>
the ULA has no chance to collision in the real world, as OMNI claims. It=E2=
=80=99s just<br>
that your argument here plays the other way, because there are less random =
bits<br>
(56)=C2=A0 in the ULA prefix than in the IID (62), and if one starts using =
more<br>
prefix bits to be non-random, there will be a time when DAD on prefix is ne=
eded.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Let us consider the upload/download time of a vehicle when it =
passes<br>
=C2=A0 =C2=A0through the wireless communication coverage of an IP-RSU.=C2=
=A0 For a<br>
=C2=A0 =C2=A0given typical setting where 1km is the maximum DSRC communicat=
ion<br>
=C2=A0 =C2=A0range [DSRC] and 100km/h is the speed limit in highway, the dw=
elling<br>
=C2=A0 =C2=A0time can be calculated to be 72 seconds by dividing the diamet=
er of<br>
=C2=A0 =C2=A0the 2km (i.e., two times of DSRC communication range where an =
IP-RSU<br>
=C2=A0 =C2=A0is located in the center of the circle of wireless communicati=
on) by<br>
=C2=A0 =C2=A0the speed limit of 100km/h (i.e., about 28m/s).=C2=A0 For the =
72 seconds,<br>
=C2=A0 =C2=A0a vehicle passing through the coverage of an IP-RSU can upload=
 and<br>
=C2=A0 =C2=A0download data packets to/from the IP-RSU.<br>
<br>
&lt;snip&gt;<br>
<br>
4.3.=C2=A0 V2V-based Internetworking<br>
<br>
&gt;&gt;&gt; In this section it looks like the cars are in a stable line of=
 sight<br>
relationship. Which is probably fine for a platoon, but when you drive alon=
g<br>
with friends in different cars, you realize that the line of sight assumpti=
on<br>
does not stand over time. Soon enough, other cars meddle in, and possibly o=
ne<br>
of the cars drives faster and too far ahead so you need the infra to relay,=
<br>
possibly over multiple infra hops.<br>
<br>
&gt;&gt;&gt; so in this section, I=E2=80=99d expect to see a Vehicle commun=
icating with another<br>
one and using either line of sight or V2V relaying but also using relay via=
 V2I<br>
(multihop I2I not just hub and spoke V2I2V ), alternatively to together for=
<br>
redundancy. Is that part of the problem?<br>
<br>
&gt;&gt;&gt; reading deeper section 5 I found excellent text on routing via=
 V and via I.<br>
This tells that section 4 does not play a good role at justifying section 5=
.<br>
Maybe keep section 4 for another doc?<br>
<br>
&gt;&gt;&gt; What kind or reliability is required in a V2V use case? Do you=
 think ND can<br>
handle it? Or MANET? What would be the assumption on L2 (roaming time, unic=
ast<br>
vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3 <br=
>
redundancy?<br>
<br>
&lt;snip&gt;<br>
<br>
5.=C2=A0 Problem Statement<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0In order to specify protocols using the architecture mentioned=
 in<br>
=C2=A0 =C2=A0Section 4.1, IPv6 core protocols have to be adapted to overcom=
e<br>
=C2=A0 =C2=A0certain challenging aspects of vehicular networking.=C2=A0 Sin=
ce the<br>
=C2=A0 =C2=A0vehicles are likely to be moving at great speed, protocol exch=
anges<br>
=C2=A0 =C2=A0need to be completed in a time relatively short compared to th=
e<br>
=C2=A0 =C2=A0lifetime of a link between a vehicle and an IP-RSU, or between=
 two<br>
=C2=A0 =C2=A0vehicles.<br>
<br>
&gt;&gt;&gt; Any order of magnitude?<br>
&gt;&gt;&gt; Can you indicate whether this already rules out certain proced=
ures, e.g.<br>
DAD ?<br>
<br>
=C2=A0 =C2=A0The lifetime of a session varies depending on the session&#39;=
s type such<br>
=C2=A0 =C2=A0as a web surfing, voice call over IP, and DNS query.=C2=A0 Reg=
ardless of a<br>
=C2=A0 =C2=A0session&#39;s type, to guide all the IPv6 packets to their des=
tination<br>
=C2=A0 =C2=A0host, IP mobility should be supported for the session.<br>
<br>
&gt;&gt;&gt; this seems to be for unicast when you know who to talk to. Is =
there a need<br>
some multicast groups like anybody around interested in topic blah like I c=
ould<br>
be multicasting the speed of vehicles coming the other way that I crossed<b=
r>
recently, for use of vehicles that I=E2=80=99m crossing now, so they can se=
e a slowdown<br>
on advance<br>
<br>
=C2=A0 =C2=A0Thus, the time constraint of a wireless link has a major impac=
t on<br>
=C2=A0 =C2=A0IPv6 Neighbor Discovery (ND).=C2=A0 Mobility Management (MM) i=
s also<br>
=C2=A0 =C2=A0vulnerable to disconnections that occur before the completion =
of<br>
=C2=A0 =C2=A0identity verification and tunnel management.=C2=A0 This is esp=
ecially true<br>
=C2=A0 =C2=A0given the unreliable nature of wireless communication.=C2=A0 T=
his section<br>
=C2=A0 =C2=A0presents key topics such as neighbor discovery and mobility<br=
>
=C2=A0 =C2=A0management.<br>
<br>
&gt;&gt;&gt; Only ND? What about the MANET?<br>
&gt;&gt;&gt; how fast should ND be to be suitable?<br>
&gt;&gt;&gt; is there also a bandwidth check? You can make things much fast=
er if you<br>
dedicate a lot of spectrum to it. But that can also be a waste.<br>
<br>
5.1.=C2=A0 Neighbor Discovery<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The requirements for IPv6 ND for vehicular networks are effici=
ent DAD<br>
=C2=A0 =C2=A0and NUD operations.<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 This merging and partitioning should be considered for=
 the<br>
=C2=A0 =C2=A0IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAA=
C)<br>
=C2=A0 =C2=A0[RFC4862].<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Also, the partitioning of a VANET may make vehicles with the s=
ame<br>
=C2=A0 =C2=A0prefix be physically unreachable.=C2=A0 Also, SLAAC needs to p=
revent IPv6<br>
=C2=A0 =C2=A0address duplication due to the merging of VANETs.=C2=A0 Accord=
ing to the<br>
=C2=A0 =C2=A0merging and partitioning, a destination vehicle (as an IPv6 ho=
st)<br>
=C2=A0 =C2=A0needs to be distinguished as either an on-link host or an off-=
link<br>
=C2=A0 =C2=A0host even though the source vehicle uses the same prefix as th=
e<br>
=C2=A0 =C2=A0destination vehicle.<br>
<br>
&gt;&gt;&gt; should reference to draft-nordmark-intarea-ippl<br>
<br>
=C2=A0 =C2=A0To efficiently prevent IPv6 address duplication due to the VAN=
ET<br>
=C2=A0 =C2=A0partitioning and merging from happening in vehicular networks,=
 the<br>
=C2=A0 =C2=A0vehicular networks need to support a vehicular-network-wide DA=
D by<br>
=C2=A0 =C2=A0defining a scope that is compatible with the legacy DAD.=C2=A0=
 In this<br>
=C2=A0 =C2=A0case, two vehicles can communicate with each other when there =
exists<br>
=C2=A0 =C2=A0a communication path over VANET or a combination of VANETs and=
 IP-<br>
=C2=A0 =C2=A0RSUs, as shown in Figure 1.=C2=A0 By using the vehicular-netwo=
rk-wide DAD,<br>
=C2=A0 =C2=A0vehicles can assure that their IPv6 addresses are unique in th=
e<br>
=C2=A0 =C2=A0vehicular network whenever they are connected to the vehicular=
<br>
=C2=A0 =C2=A0infrastructure or become disconnected from it in the form of V=
ANET.<br>
<br>
&gt;&gt;&gt; Excellent<br>
<br>
=C2=A0 =C2=A0ND time-related parameters such as router lifetime and Neighbo=
r<br>
=C2=A0 =C2=A0Advertisement (NA) interval need to be adjusted for vehicle sp=
eed and<br>
=C2=A0 =C2=A0vehicle density.=C2=A0 For example, the NA interval needs to b=
e<br>
=C2=A0 =C2=A0dynamically adjusted according to a vehicle&#39;s speed so tha=
t the<br>
=C2=A0 =C2=A0vehicle can maintain its neighboring vehicles in a stable way,=
<br>
=C2=A0 =C2=A0considering the collision probability with the NA messages sen=
t by<br>
=C2=A0 =C2=A0other vehicles.<br>
<br>
&gt;&gt;&gt; Is that a problem or just an operational setting that needs to=
 be found?<br>
&gt;&gt;&gt; Do we need to reconsider the concepts of those timers?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, IPv6 ND should have =
minimum<br>
=C2=A0 =C2=A0changes for the interoperability with the legacy IPv6 ND used =
in the<br>
=C2=A0 =C2=A0Internet, including the DAD and NUD operations.<br>
<br>
&gt;&gt;&gt; I do not find the logical link with the text before, why is th=
is a =E2=80=9Cthus=E2=80=9D?<br>
&gt;&gt;&gt; why should the ND inside the VANET be constrained to be intero=
perable? This<br>
may place constraints on the solution.<br>
<br>
5.1.1.=C2=A0 Link Model<br>
<br>
=C2=A0 =C2=A0A prefix model for a vehicular network needs to facilitate the=
<br>
<br>
&gt;&gt;&gt; Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=
=80=9Cprefix model=E2=80=9D.<br>
&gt;&gt;&gt; it would make this piece and the next should refer to<br>
draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both li=
nk<br>
and subnet issues. The general ideas are the same, but the gory details her=
e<br>
are slightly incorrect, like this notion of prefix model than comes out of =
the<br>
blue. The model is really the subnet model for the subnet associated to P2M=
P.<br>
<br>
=C2=A0 =C2=A0communication between two vehicles with the same prefix regard=
less of<br>
=C2=A0 =C2=A0the vehicular network topology as long as there exist bidirect=
ional<br>
=C2=A0 =C2=A0E2E paths between them in the vehicular network including VANE=
Ts and<br>
=C2=A0 =C2=A0IP-RSUs.=C2=A0 This prefix model allows vehicles with the same=
 prefix to<br>
=C2=A0 =C2=A0communicate with each other via a combination of multihop V2V =
and<br>
=C2=A0 =C2=A0multihop V2I with VANETs and IP-RSUs.=C2=A0 Note that the OMNI=
 interface<br>
=C2=A0 =C2=A0supports an NBMA link model where multihop V2V and V2I communi=
cations<br>
=C2=A0 =C2=A0use each mobile node&#39;s ULAs without need for any DAD or ML=
D<br>
=C2=A0 =C2=A0messaging.<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; I kinda agree about the OMNI interface model, nothing against =
that. But you<br>
must see that there needs a lot more than what the OMNI interface to get<br=
>
packets across V and I hops to the destination. Like routing ala MANET,<br>
redundancy handling ala DetNet because it will be very lossy, path manageme=
nt<br>
ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND so i=
t does not<br>
solve the ND problems above.<br>
<br>
=C2=A0 =C2=A0IPv6 protocols work under certain assumptions that do not nece=
ssarily<br>
=C2=A0 =C2=A0hold for vehicular wireless access link types other than OMNI/=
NBMA<br>
=C2=A0 =C2=A0[VIP-WAVE][RFC5889]; the rest of this section discusses implic=
ations<br>
=C2=A0 =C2=A0for those link types that do not apply when the OMNI/NBMA link=
 model<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; The keyword here is P2MP / NBMA, and OMNI is one interface tha=
t accepts<br>
that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already P2M=
P / NBMA,<br>
using routing to complete the partial mesh in P2MP. The text seems to imply=
<br>
that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI is=
 loaded with<br>
other stuff than a plain P2MP capable interface. And ND over P2MP is not do=
ne<br>
by OMNI, OMNI only makes classical ND worse and only works in a full mesh. =
OTOH<br>
RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work very =
well<br>
within an OMNI interface and solve those problems. &gt;&gt;&gt; My point is=
 that you<br>
need to tell the full story or refrain from entering solution space in this=
 doc<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0There is a relationship between a link and a prefix, besides t=
he<br>
=C2=A0 =C2=A0different scopes that are expected from the link-local and glo=
bal<br>
=C2=A0 =C2=A0types of IPv6 addresses.=C2=A0 In an IPv6 link, it is assumed =
that all<br>
=C2=A0 =C2=A0interfaces which are configured with the same subnet prefix an=
d with<br>
=C2=A0 =C2=A0on-link bit set can communicate with each other on an IPv6 lin=
k.<br>
<br>
&gt;&gt;&gt; not assumed; that=E2=80=99s what the onlink but set tells. The=
 conclusion should be<br>
that the VANET cannot set the O bit.<br>
<br>
=C2=A0 =C2=A0However, the vehicular link model needs to define the relation=
ship<br>
=C2=A0 =C2=A0between a link and a prefix, considering the dynamics of wirel=
ess<br>
=C2=A0 =C2=A0links and the characteristics of VANET.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0From the previous observation, a vehicular link model should c=
onsider<br>
=C2=A0 =C2=A0the frequent partitioning and merging of VANETs due to vehicle=
<br>
=C2=A0 =C2=A0mobility.=C2=A0 Therefore, the vehicular link model needs to u=
se an on-<br>
=C2=A0 =C2=A0link prefix and off-link prefix according to the network topol=
ogy of<br>
=C2=A0 =C2=A0vehicles such as a one-hop reachable network and a multihop re=
achable<br>
<br>
&gt;&gt;&gt; No, the once a node saw a O bit set that sticks even if it see=
s other<br>
advertisements of the PIO with the O bit not set. &gt;&gt;&gt; This is a gl=
obal and<br>
intrinsic property of the prefix (and an attack vector that could be mentio=
ned<br>
in the sec section). &gt;&gt;&gt; the VANET prefix must never come with the=
 O bit set.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0network (or partitioned networks).=C2=A0 If the vehicles with =
the same<br>
=C2=A0 =C2=A0prefix are reachable from each other in one hop, the prefix sh=
ould be<br>
=C2=A0 =C2=A0on-link.<br>
<br>
&gt;&gt;&gt;&gt; No, see above; but the router may redirect though it is re=
ally risky<br>
unless this is a stable situation like a parking place.<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, the vehicular link m=
odel<br>
=C2=A0 =C2=A0should have minimum changes for interoperability with standard=
 IPv6<br>
=C2=A0 =C2=A0links in an efficient fashion to support IPv6 DAD, MLD and NUD=
<br>
=C2=A0 =C2=A0operations.=C2=A0 When the OMNI NBMA link model is used, there=
 are no link<br>
=C2=A0 =C2=A0model changes nor DAD/MLD messaging required.<br>
<br>
&gt;&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt;&gt; You need a good P2MP subnet model with routing support whe=
n the mesh is<br>
partial. My company alone has been shipping million of nodes that build sub=
nets<br>
of thousands, and that was done using IETF standards.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For vehicular networks with high mobility and density, the DAD=
 needs<br>
=C2=A0 =C2=A0to be performed efficiently with minimum overhead so that the<=
br>
=C2=A0 =C2=A0vehicles can exchange a driving safety message (e.g., collisio=
n<br>
=C2=A0 =C2=A0avoidance and accident notification) with each other with a sh=
ort<br>
=C2=A0 =C2=A0interval (e.g., 0.5 second) by a technical report from NHTSA<b=
r>
=C2=A0 =C2=A0(National Highway Traffic Safety Administration) [NHTSA-ACAS-R=
eport].<br>
=C2=A0 =C2=A0Such a driving safety message may include a vehicle&#39;s mobi=
lity<br>
=C2=A0 =C2=A0information (i.e., position, speed, direction, and acceleratio=
n/<br>
=C2=A0 =C2=A0deceleration).=C2=A0 The exchange interval of this message is =
0.5 second,<br>
=C2=A0 =C2=A0which is required to allow a driver to avoid a rear-end crash =
from<br>
=C2=A0 =C2=A0another vehicle.<br>
<br>
&gt;&gt;&gt; IPv6 over broadcast MAC (used to be called internet 0, 10+ yea=
rs ago)<br>
solves that MAC issue since there is no MAC.<br>
<br>
5.1.3.=C2=A0 Routing<br>
<br>
=C2=A0 =C2=A0For multihop V2V communications in either a VANET or VANETs vi=
a IP-<br>
=C2=A0 =C2=A0RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing proto=
col may<br>
=C2=A0 =C2=A0be required to support both unicast and multicast in the links=
 of the<br>
=C2=A0 =C2=A0subnet with the same IPv6 prefix.=C2=A0 However, it will be co=
stly to run<br>
=C2=A0 =C2=A0both vehicular ND and a vehicular ad hoc routing protocol in t=
erms of<br>
=C2=A0 =C2=A0control traffic overhead [ID-Multicast-Problems].<br>
<br>
&gt;&gt;&gt; we do that with IETF standards on battery operated devices alr=
eady. Using<br>
RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve see=
n 30 hops in<br>
meshes of thousands in the real world though it=E2=80=99s not the normal op=
erational<br>
model, but can happen to maintain connectivity during the reboot of a root)=
 and<br>
does not use broadcast. RPL was initially designed as a V2V2V protocol but<=
br>
found its market on the IoT. I=E2=80=99m sure the protocol would gladly com=
e back to<br>
its roots.<br>
<br>
=C2=A0 =C2=A0A routing protocol for a VANET may cause redundant wireless fr=
ames in<br>
=C2=A0 =C2=A0the air to check the neighborhood of each vehicle and compute =
the<br>
=C2=A0 =C2=A0routing information in a VANET with a dynamic network topology=
<br>
=C2=A0 =C2=A0because the IPv6 ND is used to check the neighborhood of each<=
br>
=C2=A0 =C2=A0vehicle.=C2=A0 Thus, the vehicular routing needs to take advan=
tage of the<br>
=C2=A0 =C2=A0IPv6 ND to minimize its control overhead.<br>
<br>
&gt;&gt;&gt; A clean description of the interaction of RPL and RFC 8505 in =
our IoT<br>
networks. Note that the speed of the PHY in VANET balanced the instability =
of<br>
the topology, and RPL still applies. Note also that RPL uses DV with a rout=
ing<br>
stretch in order to minimize the topology awareness that=E2=80=99s needed i=
n each node,<br>
which results in minimal signaling.<br>
<br>
5.2.=C2=A0 Mobility Management<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For a mobility management scheme in a shared link, where the w=
ireless<br>
=C2=A0 =C2=A0subnets of multiple IP-RSUs share the same prefix, an efficien=
t<br>
=C2=A0 =C2=A0vehicular-network-wide DAD is required.=C2=A0 If DHCPv6 is use=
d to assign<br>
=C2=A0 =C2=A0a unique IPv6 address to each vehicle in this shared link,<br>
<br>
&gt;&gt;&gt; I would not use the term link, or shared. Maybe shared link -&=
gt; domain?<br>
&lt;snip&gt;<br>
<br>
the DAD is<br>
=C2=A0 =C2=A0not required.=C2=A0 On the other hand, for a mobility manageme=
nt scheme<br>
=C2=A0 =C2=A0with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] a=
nd OMNI<br>
=C2=A0 =C2=A0[OMNI]), DAD is not required because the IPv6 address of a veh=
icle&#39;s<br>
=C2=A0 =C2=A0external wireless interface is guaranteed to be unique.<br>
<br>
&gt;&gt;&gt; again overselling OMNI<br>
&gt;&gt;&gt; As I said earlier, this is wring there are (64*) more chances =
of a<br>
collision in OMNI prefixes than in IPv6 IIDs. &gt;&gt;&gt; OMNI prefixes ca=
n collision,<br>
home addresses that are unique on a home network cannot. &gt;&gt;&gt; Now i=
f both the<br>
OMNI prefix and the IID are good randoms, then obviously, the chances of<br=
>
collisions round up to 0. &gt;&gt;&gt; Collision is certainly not my worst =
fear.<br>
<br>
=C2=A0 There is a<br>
=C2=A0 =C2=A0tradeoff between the prefix usage efficiency and DAD overhead.=
=C2=A0 Thus,<br>
=C2=A0 =C2=A0the IPv6 address autoconfiguration for vehicular networks need=
s to<br>
=C2=A0 =C2=A0consider this tradeoff to support efficient mobility managemen=
t.<br>
<br>
&gt;&gt;&gt; This is way too superficial and hides the reality of things.<b=
r>
- Using a VANET Infra prefix allows direct routability to the internet whic=
h<br>
BYOA does not since the BYOA is not topologically correct. Yes, it costs a =
DAD<br>
with classic ND, but it does not with RCF8505 and the draft fails to mentio=
n<br>
that. - A BYOA needs a tunnel home, and the node needs to know who is reach=
able<br>
inside the VANET and what is not to decide to tunnel or not; this is a<br>
difficult problem (vs. control place overhead) that is not discussed here.<=
br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the case of a multihomed network, a vehicle can follow the=
 first-<br>
=C2=A0 =C2=A0hop router selection rule described in [RFC8028].=C2=A0 That i=
s, the<br>
=C2=A0 =C2=A0vehicle should select its default router for each prefix by<br=
>
=C2=A0 =C2=A0preferring the router that advertised the prefix.<br>
<br>
&gt;&gt;&gt; Still router discovery (in and out) must be very fast. Thing o=
f the RA<br>
intervale in MIPv6. Is that sufficient? Too expensive?<br>
<br>
&lt;snip&gt;<br>
<br>
6.=C2=A0 Security Considerations<br>
&gt;&gt;&gt; Any discussion on the security of classical ND and other opera=
tional issues<br>
(rfc6583) ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Security and privacy are paramount in V2I, V2V, and V2X networ=
king.<br>
=C2=A0 =C2=A0Vehicles and infrastructure must be authenticated in order to<=
br>
=C2=A0 =C2=A0participate in vehicular networking.=C2=A0 Also, in-vehicle de=
vices (e.g.,<br>
=C2=A0 =C2=A0ECU) and a driver/passenger&#39;s mobile devices (e.g., smartp=
hone and<br>
=C2=A0 =C2=A0tablet PC) in a vehicle need to communicate with other in-vehi=
cle<br>
=C2=A0 =C2=A0devices and another driver/passenger&#39;s mobile devices in a=
nother<br>
=C2=A0 =C2=A0vehicle, or other servers behind an IP-RSU in a secure way.=C2=
=A0 Even<br>
=C2=A0 =C2=A0though a vehicle is perfectly authenticated and legitimate, it=
 may be<br>
=C2=A0 =C2=A0hacked for running malicious applications to track and collect=
 its<br>
=C2=A0 =C2=A0and other vehicles&#39; information.=C2=A0 In this case, an at=
tack mitigation<br>
=C2=A0 =C2=A0process may be required to reduce the aftermath of malicious<b=
r>
=C2=A0 =C2=A0behaviors.<br>
<br>
&gt;&gt;&gt; The section should mention that both with classical ND and BYO=
A, addresses<br>
can be impersonated, and RFC 8928 protects against that in both cases while=
<br>
maintaining privacy.<br>
<br>
=C2=A0 =C2=A0Even though vehicles can be authenticated with valid certifica=
tes by<br>
=C2=A0 =C2=A0an authentication server in the vehicular cloud, the authentic=
ated<br>
<br>
&gt;&gt;&gt; Is PKI feasible (deploying it in every car?). Is it fast enoug=
h? Is it<br>
really what IPWAVE thinks vehicle should use????? &gt;&gt;&gt; e.g. why wou=
ld one need<br>
to authenticate to a V2I network? &gt;&gt;&gt; from the text earlier in the=
 doc, it<br>
seemed that what you really want is access that is fast to join, capable of=
<br>
offering the reachability you want, anonymous, and innocuous (cars can not =
harm<br>
one another).<br>
<br>
=C2=A0 =C2=A0vehicles may harm other vehicles, so their communication activ=
ities<br>
=C2=A0 =C2=A0need to be logged in either a central way through a logging se=
rver<br>
=C2=A0 =C2=A0(e.g., TCC) in the vehicular cloud or a distributed way (e.g.,=
<br>
=C2=A0 =C2=A0blockchain [Bitcoin]) along with other vehicles or infrastruct=
ure.<br>
=C2=A0 =C2=A0For the non-repudiation of the harmful activities of malicious=
 nodes,<br>
=C2=A0 =C2=A0a blockchain technology can be used [Bitcoin].=C2=A0 Each mess=
age from a<br>
=C2=A0 =C2=A0vehicle can be treated as a transaction and the neighboring ve=
hicles<br>
=C2=A0 =C2=A0can play the role of peers in a consensus method of a blockcha=
in<br>
=C2=A0 =C2=A0[Bitcoin][Vehicular-BlockChain].=C2=A0 For a blockchain&#39;s =
efficient<br>
=C2=A0 =C2=A0consensus in vehicular networks having fast moving vehicles, a=
 new<br>
=C2=A0 =C2=A0consensus algorithm needs to be developed or an existing conse=
nsus<br>
=C2=A0 =C2=A0algorithm needs to be enhanced.<br>
<br>
&gt;&gt;&gt; solution space; better express the=C2=A0 security needs since =
this is a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To identify malicious vehicles among vehicles, an authenticati=
on<br>
=C2=A0 =C2=A0method is required.<br>
<br>
&gt;&gt;&gt; No. As said earlier a vehicle can be infected. You need innocu=
ousness.which<br>
can come from things like isolation, zerotrust, and protocols that are<br>
difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 is<b=
r>
protected by construction, anonymous, and fast.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the setup of a secure channel over IPsec or TLS, the multi=
hop V2I<br>
=C2=A0 =C2=A0communications over DSRC is required in a highway for the<br>
=C2=A0 =C2=A0authentication by involving multiple intermediate vehicles as =
relay<br>
=C2=A0 =C2=A0nodes toward an IP-RSU connected to an authentication server i=
n the<br>
=C2=A0 =C2=A0vehicular cloud.=C2=A0 The V2I communications over 5G V2X (or =
LTE V2X) is<br>
=C2=A0 =C2=A0required to allow a vehicle to communicate directly with a gNo=
deB (or<br>
=C2=A0 =C2=A0eNodeB) connected to an authentication server in the vehicular=
 cloud.<br>
<br>
&gt;&gt;&gt; solution space. Instead, you could mention that setting up sec=
ured channels<br>
between cars that cross one another might not complete in time to establish=
 the<br>
communication channel, and that the innocuousness must come from zerotrust =
in<br>
the transactions between the cars.<br>
=C2=A0 =C2=A0For the IPv6 ND, the DAD is required to ensure the uniqueness =
of the<br>
=C2=A0 =C2=A0IPv6 address of a vehicle&#39;s wireless interface.<br>
<br>
&gt;&gt;&gt; for classical ND (SLAAC) that=E2=80=99s true. That is not with=
 RFC 8505, since the<br>
infra maintains a table of all addresses in use in the prefix and blocks<br=
>
duplicates without the RFC 4862 DAD method. The stateful autoconf address g=
rant<br>
is immediate.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This DAD can be used<br>
=C2=A0 =C2=A0as a flooding attack that uses the DAD-related ND packets<br>
=C2=A0 =C2=A0disseminated over the VANET or vehicular networks.<br>
<br>
&gt;&gt;&gt; also for DOS attacks. You can block a owner from using an addr=
ess. A<br>
reference to rfc6959 is much needed here.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0This possibility<br>
=C2=A0 =C2=A0indicates that the vehicles and IP-RSUs need to filter out sus=
picious<br>
=C2=A0 =C2=A0ND traffic in advance.=C2=A0 Based on the SEND [RFC3971] mecha=
nism, the<br>
=C2=A0 =C2=A0authentication for routers (i.e., IP-RSUs) can be conducted by=
 only<br>
=C2=A0 =C2=A0selecting an IP-RSU that has a certification path toward trust=
ed<br>
=C2=A0 =C2=A0parties.=C2=A0 For authenticating other vehicles, the cryptogr=
aphically<br>
=C2=A0 =C2=A0generated address (CGA) can be used to verify the true owner o=
f a<br>
=C2=A0 =C2=A0received ND message, which requires to use the CGA ND option i=
n the<br>
=C2=A0 =C2=A0ND protocols.=C2=A0 For a general protection of the ND mechani=
sm, the RSA<br>
=C2=A0 =C2=A0Signature ND option can also be used to protect the integrity =
of the<br>
=C2=A0 =C2=A0messages by public key signatures.=C2=A0 For a more advanced<b=
r>
=C2=A0 =C2=A0authentication mechanism, a distributed blockchain-based mecha=
nism<br>
=C2=A0 =C2=A0[Vehicular-BlockChain] can be used.<br>
<br>
&gt;&gt;&gt; solution space. Again, the draft should focus on problems and =
needs. The<br>
problem here is that SEND is complex, and not implemented in the major stac=
k.<br>
It relies on PKI for trusting the router. The V2I need is a zerotrust model=
<br>
where one V, the other local Vs, and the I, can help each other anonymously=
 and<br>
harmlessly. &lt;snip&gt;<br>
<br>
8.=C2=A0 Informative References<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&lt;snip&gt;<br>
<br>
Voila!<br>
<br>
Keep safe;<br>
<br>
Pascal<br>
<br>
<br>
<br>
_______________________________________________<br>
its mailing list<br>
<a href=3D"mailto:its@ietf.org" target=3D"_blank">its@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/its" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/its</a><br>
</blockquote></div>
</blockquote></div>

--000000000000183b2905caf386b0--


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es>
CC: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>, "int-dir@ietf.org" <int-dir@ietf.org>, Last Call <last-call@ietf.org>, "draft-ietf-ipwave-vehicular-networking.all@ietf.org" <draft-ietf-ipwave-vehicular-networking.all@ietf.org>, its <its@ietf.org>, Russ Housley <housley@vigilsec.com>, skku-iotlab-members <skku-iotlab-members@googlegroups.com>, Chris Shen <shenyiwen7@gmail.com>
Thread-Topic: [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
Thread-Index: AQHXnaEfYG5OxbG0t0CtxP7uKKzvK6uPiM6AgAAWaPk=
Date: Wed, 1 Sep 2021 20:09:14 +0000
Message-ID: <AE354C12-DCCF-40EE-BF69-73308FC2F1F2@cisco.com>
References: <162400216663.17839.1738900015320888640@ietfa.amsl.com> <CAPK2DezN9benfLS9VQw1uS9cEXMQFjrs_m-jJu+3JtgCrfBWWQ@mail.gmail.com> <CALypLp9c=GKPRyprBZidXsJExoif0QWtDSdT-vQnkN9MCUBYCQ@mail.gmail.com>
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
CC: "int-dir@ietf.org" <int-dir@ietf.org>, Last Call <last-call@ietf.org>, "draft-ietf-ipwave-vehicular-networking.all@ietf.org" <draft-ietf-ipwave-vehicular-networking.all@ietf.org>, "its@ietf.org" <its@ietf.org>, Russ Housley <housley@vigilsec.com>, "CARLOS JESUS BERNARDOS CANO" <cjbc@it.uc3m.es>, skku-iotlab-members <skku-iotlab-members@googlegroups.com>, Chris Shen <shenyiwen7@gmail.com>
Thread-Topic: [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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Subject: Re: [Int-dir] [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: "Pascal Thubert (pthubert)" <pthubert=40cisco.com@dmarc.ietf.org>, "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
CC: "its@ietf.org" <its@ietf.org>, "int-dir@ietf.org" <int-dir@ietf.org>, Chris Shen <shenyiwen7@gmail.com>, Russ Housley <housley@vigilsec.com>, "draft-ietf-ipwave-vehicular-networking.all@ietf.org" <draft-ietf-ipwave-vehicular-networking.all@ietf.org>, "CARLOS JESUS BERNARDOS CANO" <cjbc@it.uc3m.es>, skku-iotlab-members <skku-iotlab-members@googlegroups.com>
Thread-Topic: [Int-dir] [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
Thread-Index: AQHXn8m+1ZeyCZC94UiIUpixPYsadA==
Date: Thu, 2 Sep 2021 07:11:26 +0000
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Subject: Re: [Int-dir] [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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From: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
Date: Fri, 3 Sep 2021 00:30:13 +0900
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
Cc: "int-dir@ietf.org" <int-dir@ietf.org>, Last Call <last-call@ietf.org>, "its@ietf.org" <its@ietf.org>, Russ Housley <housley@vigilsec.com>, CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es>,  Chris Shen <shenyiwen7@gmail.com>, "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
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Subject: Re: [Int-dir] [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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Hi Pascal,
I have reflected your comments on the revision:
https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networkin=
g-22

Though the text provided by you is excellent, it is long, so I place it on
Appendix B:
https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networkin=
g-22#appendix-B

In Section 5.1.3.  Routing, I explain RPL concisely along with pros and
cons:
https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networkin=
g-22#section-5.1.3

The changes with my some editings look like the following:
---------------------------------------------------------------------------=
-------------------------------------------
5.1.3. Routing
...
RPL [RFC6550] defines a routing protocol for low-power and lossy networks,
which constructs and
maintains DODAGs optimized by an Objective Function (OF). A defined OF
provides route selection
and optimization within an RPL topology. A node in a DODAG uses DODAG
Information Objects (DIOs)
messages to discover and maintain the upward routes toward the root node.
Refer to Appendix B for
the detailed description of RPL for multihop V2X networking.
...
----------
Appendix B. Support of Multihop V2X Networking
...
RPL is primarily designed to minimize the control plane activity, which is
the relative amount of routing
protocol exchanges versus data traffic; this approach is beneficial for
situations where the power and
bandwidth are scarce (e.g., an IoT LLN where RPL is typically used today),
but also in situations of
high relative mobility between the nodes in the network (also known as
swarming, e.g., within a
variable set of vehicles with a similar global motion, or a variable set of
drones flying toward the same
direction).

To reduce the routing exchanges, RPL leverages a Distance Vector approach,
which does not need a
global knowledge of the topology, and only optimizes the routes to and from
the root, allowing
Peer-to-Peer (P2P) paths to be stretched. Although RPL installs its routes
proactively, it only maintains
them lazily, that is, in reaction to actual traffic, or as a slow
background activity. Additionally, RPL
leverages the concept of an objective function (called OF), which allows to
adapt the activity of the
routing protocol to use cases, e.g., type, speed, and quality of the
radios. RPL does not need converge,
and provides connectivity to most nodes most of the time. The default route
toward the root is
maintained aggressively and may change while a packet progresses without
causing loops, so the
packet will still reach the root. There are two modes for routing in RPL
such as non-storing mode and
storing mode. In non-storing mode, a node inside the mesh/swarm that
changes its point(s) of
attachment to the graph informs the root with a single unicast packet
flowing along the default route,
and the connectivity is restored immediately; this mode is preferable for
use cases where Internet
connectivity is dominant. On the other hand, in storing mode, the routing
stretch is reduced, for a
better P2P connectivity, while the Internet connectivity is restored more
slowly, during the time for
the DV operation to operate hop-by-hop. While an RPL topology can quickly
scale up and down and
fits the needs of mobility of vehicles, the total performance of the system
will also depend on how
quickly a node can form an address, join the mesh (including
Authentication, Authorization, and
Accounting (AAA)), and manage its global mobility to become reachable from
another node outside
the mesh.
...
---------------------------------------------------------------------------=
-------------------------------------------

If you have further comments, please let me know.

Thanks.

Best Regards,
Paul

On Thu, Sep 2, 2021 at 3:49 PM Pascal Thubert (pthubert) <pthubert@cisco.co=
m>
wrote:

> Hello Paul
>
>
>
> This is absolutely excellent. I=E2=80=99m very happy will all the changes=
 and your
> attached pdf made my life as a reviewer a lot simpler.
>
>
>
> This is really a great way of progressing together. Many thanks for that!
>
>
>
> I=E2=80=99m all good but for a little snippet in the new text which is ac=
tually
> incorrect, and denotes a usual misunderstanding of RPL that your doc may
> help correct for the future:
>
>
>
> =E2=80=9C
>
> Although RPL can be used in IPv6-based vehicular networks, it is primaril=
y
> designed for lossy
>
> networks, which puts energy efficiency first. In addition, the topology i=
t
> considers may not
>
> quickly scale up and down for IPv6-based vehicular networks, since the
> mobility of vehicles is
>
> much more diverse with a high speed, so it can frequently alter a
> tree-like topology formed by
>
> RPL, which may cause network fragmentation and merging with more control
> traffic
>
> =E2=80=9C
>
>
>
>
>
> The roots of my contribution to RPL are in vehicular networks, exactly th=
e
> use case you describe. Based on that experience (including some actual te=
st
> with NASA) I=E2=80=99d change the text above with:
>
>
>
>
>
> =E2=80=9C
>
> RPL is primarily designed to minimize the control plane activity, that is
> the relative amount of routing protocol exchanges vs. data traffic; this
> approach is beneficial for situations where the power and bandwidth are
> scarce (e.g., an IoT LLN where RPL is typically used today), but also in
> situations of high relative mobility between the nodes in the network (ak=
a
> swarming, e.g., within a variable set of vehicles with a similar global
> motion, or a toon of drones).
>
> To reduce the routing exchanges, RPL leverages a Distance Vector approach=
,
> which does not need a global knowledge of the topology, and only optimize=
s
> the routes to and from the root, allowing P2P paths to be stretched.
> Although RPL installs its routes proactively, it only maintains them
> lazily, in reaction to actual traffic, or as a slow background activity.
> Additionally, RPL leverages the concept of an objective function, which
> allows to adapt the activity of the routing protocol to the use case, e.g=
.,
> type, speed, and quality of the radios. RPL does not need converge, and
> provides connectivity to most nodes most of the time. The default route
> towards the Root is maintained aggressively and may change while a packet
> progresses without causing loops, so the packet will still reach the root=
.
> In non-storing mode, a node inside the mesh/swarm that changes its point(=
s)
> of attachment to the graph informs the root with a single unicast packet
> the flows along the default route, and the connectivity is restored
> immediately; this mode is preferable for use cases where internet
> connectivity is dominant. OTOH, in storing mode, the routing stretch is
> reduced, for a better P2P connectivity, while the internet connectivity i=
s
> restored more slowly, time for the DV operation to operate hop-by-hop.
> While a RPL topology can quickly scale up and down and fits the needs of
> mobility of vehicles, the total performance of the system will also depen=
d
> on how quickly a node can form an address, join the mesh (including AAA),
> and manage its global mobility to become reachable from outside the mesh.
>
> =E2=80=9C
>
>
>
> Otherwise, all good!
>
>
>
> Take care,
>
>
>
> Pascal
>
>
>
>
>
> *From:* Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
> *Sent:* lundi 30 ao=C3=BBt 2021 15:12
> *To:* Pascal Thubert (pthubert) <pthubert@cisco.com>
> *Cc:* int-dir@ietf.org; Last Call <last-call@ietf.org>;
> draft-ietf-ipwave-vehicular-networking.all@ietf.org; its@ietf.org; Russ
> Housley <housley@vigilsec.com>; CARLOS JESUS BERNARDOS CANO <
> cjbc@it.uc3m.es>; skku-iotlab-members <
> skku-iotlab-members@googlegroups.com>; Chris Shen <shenyiwen7@gmail.com>;
> Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
> *Subject:* Re: [ipwave] Intdir last call review of
> draft-ietf-ipwave-vehicular-networking-20
>
>
>
> Hi Pascal,
>
> Here is the revision (-21) of IPWAVE PS Draft:
>
>
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-network=
ing-21
>
>
>
> I attach the revision letter to show how I have addressed your comments o=
n
> the revision.
>
>
>
> Chris and I have worked for this revision together.
>
>
>
> If you have further comments, please let me know.
>
>
>
> Thanks.
>
>
>
> Best Regards,
>
> Paul
>
>
>
>
>
>
>
> On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert via Datatracker <
> noreply@ietf.org> wrote:
>
> Reviewer: Pascal Thubert
> Review result: Not Ready
>
> Dear authors
>
> In summary:
>
> I read a number of very good drafts collated in one, from the use cases
> that
> very complete and ready to publish, to the architecture and protocol
> solution
> in section 4 that would require more work for completeness.
>
> There are multiple instances in the use cases where protocols are listed
> coming
> out of the blue, e.g., the references to OMNI that seem artificially spre=
ad
> regardless of the context of the section. OMNI is used throughout, both a=
s
> an
> open ended toolbox, and as a carpet under which all problems can be hidde=
n.
>
> Reading this doc, OMNI shows as an interface to a software mobile router,
> with
> multiple of the device physical interfaces connected to the mobile router=
.
> This
> makes the stack very simple as the complexity moves to the router. But no=
w
> you
> have to implement the router. Presented as that, the OMNI router deserves
> its
> name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANET=
 (many to
> choose from) and NEMO (and all the MIP protocol family across address
> families), all the possible radio interfaces on which the ND problems go
> away
> by magic, and whatever else you want to put in there. Is that the
> intention?
>
> Instead of referring to OMNI for virtually anything, the doc should refer
> to
> MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),
> draft-nordmark-intarea-ippl for split subnets, and
> draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet
> models. And
> then you can say that all those components can be plugged in the OMNI
> router,
> and you can discuss which MANET and which MIP you want, including using
> OMNI=E2=80=99s
> built in mobility.
>
> Note that my objections are not against the OMNI design, it might be the
> perfect thing and I am already aware of use cases that could be served by=
 a
> P2MP interface like OMNI in conjunction with RFC8505 on the P2P
> subinterfaces
> (recycling the high level design we=E2=80=99ve been shipping for IPv4 / f=
rame
> relay for
> the last 30 years). My objection is of the way the draft uses [OMNI] as t=
he
> magic wand that solves all the problems when what you really do is throw
> them
> over the fence. I=E2=80=99d rather you focus on problems and use cases, f=
or which
> there=E2=80=99s excellent text, and indicate what needs to be done withou=
t making
> assumption on how the needful things will be solved.
>
> In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to s=
plit,
> keep all
> that=E2=80=99s use case and problem description and ship it, remove refer=
ences to
> protocols envisioned in the solution, and start the work on architecture
> of the
> solution and the protocol applicability statements separately. An alterna=
te
> would be to centralize the discussion on protocols to annex, and explain
> that
> protocol A or B could be envisioned in solution space because to over thi=
s
> gap
> or implement that function.
>
> In any fashion, the current text is not ready for publication as
> applicability
> statement, architecture and or/solution, so the related work should be
> removed
> from the main text. But I find it mostly ready for use case and problem
> statement, more below.
>
> Review:
>
> Abstract
>
>    This document discusses the problem statement and use cases of
>    IPv6-based vehicular networking for Intelligent Transportation
>    Systems (ITS).
>
> >>> The document goes beyond that; there was actually a thread at 6MAN
> where
> Bob Hinden said =E2=80=9C This document says it is a problem statement, b=
ut then
> becomes a solution document.   Might be better to cut it down to only the
> problem statement part. =E2=80=9C >>> Would you consider doing this? If n=
ot, why?
> Note:
> you may want to respond on 6MAN as well. >>> >>>I would have thought that
> the
> traditional steps of problem statement and applicability statement of
> existing
> work could be expected from IPWAVE too. >>> Please clarify the steps that
> you
> intend to follow next with this work.
>
> <snip>
>
> 1.  Introduction
>
> >>> Very readable and informative section, many thanks!
>
>    Along with these WAVE standards and C-V2X standards, regardless of a
>    wireless access technology under the IP stack of a vehicle, vehicular
>    networks can operate IP mobility with IPv6 [RFC8200] and Mobile IPv6
>    protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (PMIPv6)
>    [RFC5213], Distributed Mobility Management (DMM) [RFC7333], Locator/
>    ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Extended
>    Route Optimization (AERO) [RFC6706BIS]).
>
> >>> NEMO (RFC 3963) is not cited. Any reason why the vehicle would not
> transport a network?
>
> <snip>
>
>    This document describes use cases and a problem statement about
>    IPv6-based vehicular networking for ITS, which is named IPv6 Wireless
>    Access in Vehicular Environments (IPWAVE).  First, it introduces the
>    use cases for using V2V, V2I, and V2X networking in ITS.  Next, for
>    IPv6-based vehicular networks, it makes a gap analysis of current
>    IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Management,
>    and Security & Privacy), and then enumerates requirements for the
>    extensions of those IPv6 protocols, which are tailored to IPv6-based
>    vehicular networking.  Thus, this document is intended to motivate
>    development of key protocols for IPWAVE.
>
> >>>
>
> <snip>
>
> 2.  Terminology
>
> >>>
>
> <snip>
>
>    o  IP-OBU: "Internet Protocol On-Board Unit": An IP-OBU denotes a
>       computer situated in a vehicle (e.g., car, bicycle, autobike,
>       motor cycle, and a similar one) and a device (e.g., smartphone and
>       IoT device).  It has at least one IP interface that runs in IEEE
>       802.11-OCB and has an "OBU" transceiver.  Also, it may have an IP
>       interface that runs in Cellular V2X (C-V2X) [TS-23.285-3GPP]
>       [TR-22.886-3GPP][TS-23.287-3GPP].  See the definition of the term
>       "OBU" in [RFC8691].
>
> >>> Can that be a router connecting multiple computers?
>
> <snip>
>
> 3.  Use Cases
>
> >>> This is another great read and an enlightening section. Maybe mention
> in
> the abstract that the doc also covers use cases?
>
> <snip>
>
>    Although a Layer-2 solution can provide a support for multihop
>    communications in vehicular networks, the scalability issue related
>    to multihop forwarding still remains when vehicles need to
>    disseminate or forward packets toward multihop-away destinations.  In
>    addition, the IPv6-based approach for V2V as a network layer protocol
>    can accommodate multiple radio technologies as MAC protocols, such as
>    5G V2X and DSRC.  Therefore, the existing IPv6 protocol can be
>    augmented through the addition of an Overlay Multilink Network (OMNI)
>    Interface [OMNI] and/or protocol changes in order to support both
>    wireless single-hop/multihop V2V communications and multiple radio
>    technologies in vehicular networks.  In such a way, vehicles can
>    communicate with each other by V2V communications to share either an
>    emergency situation or road hazard in a highway having multiple kinds
>    of radio technologies, such as 5G V2X and DSRC.
>
> >>> This text appears in the middle of high level use case, with a crude
> list
> of protocols; this is not a place for it
>
> >>> On a 6MAN Thread, Brian Carpenter said that the above:
> =E2=80=9C
> is of concern regardless of the mention of OMNI. Does it mean "can be" or
> "needs to be"? This paragraph seems like a very short summary of a big
> problem
> area. At the end of page 13 there is some related discussion, which
> mentions
> RPL as part of the solution (good choice, IMHO) but again seems to depend
> on
> OMNI. I don't think the fix of simply removing references to OMNI works,
> because it would leave a gap. In an informational document, that is not a
> formal problem but as far as this draft describes architecture, I don't
> think
> that big a gap is reasonable. "OMNI" is mentioned more than 20 times in t=
he
> document. There are also several references to AERO, which is strongly
> associated with OMNI. =E2=80=9C >>> I agree with Brian. Here the document=
 seems to
> be
> mixing solution with problem and putting the cart before the horse. My
> recommendation is to stick to what needs to be done that IPv6 does not do
> yet
> -the reqs and gaps-; but the doc should not step in the how things will b=
e
> done
> unless the group already decided to do it. The logical next steps to a PS
> are
> an applicability statement of existing work, and if the gaps cannot be
> filled,
> there may be one or more WG chartered to fill those gaps.
>
> >>> I=E2=80=99d still be happy to see an annex with leads on where the so=
lution
> might
> come from like RFC 8691 does.
>
> <snip>
>
>    The existing IPv6 protocol must be augmented through the addition of
>    an OMNI interface and/or protocol changes in order to support
>    wireless multihop V2I communications in a highway where RSUs are
>    sparsely deployed, so a vehicle can reach the wireless coverage of an
>    RSU through the multihop data forwarding of intermediate vehicles.
>    Thus, IPv6 needs to be extended for multihop V2I communications.
>
> >>> Note that I have no clue on how well OMNI applies in that space, mayb=
e
> it
> does very well; but here it comes out of the blue with no justification.
> If you
> mention OMNI you need to detail what it is and which of the V2V  problems
> you
> expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.
>
> <snip>
>
>    The existing IPv6 protocol must be augmented through the addition of
>    an OMNI interface and/or protocol changes in order to support
>    wireless multihop V2X (or V2I2X) communications in an urban road
>    network where RSUs are deployed at intersections, so a vehicle (or a
>    pedestrian's smartphone) can reach the wireless coverage of an RSU
>    through the multihop data forwarding of intermediate vehicles (or
>    pedestrians' smartphones).  Thus, IPv6 needs to be extended for
>    multihop V2X (or V2I2X) communications.
>
> >>> Please be more specific on what the missing functions are and whether
> they
> are missing from the stack development standpoint or if there=E2=80=99s w=
ork needed
> from the IETF. 1)      If something is really missing in our specs, the
> text to
> prove from the use case above is missing 2)      how OMNI serves the use
> case
> could be elaborated in an applicability statement of OMNI for V2xyz, but
> it is
> a bit blunt to present it as panacea when the problems to be solved are n=
ot
> listed. 3)      If you look at it, OMNI seems like a software mobile rout=
er
> within a bump in the stack. Can that become too big?
>
> >>> my view is that the text above and the similar occasions should be
> replaced
> by something like :
>
>    The existing IPv6 protocol must be augmented to provide the following
>    functions: 1) =E2=80=A6
>
> >>> and / or something like:
>
>    In addition to the IPv6 node requirements [RFC 8504], the IPv6 protoco=
l
>    stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=A6
>
> <snip>
>
>    To support applications of these V2X use cases, the functions of IPv6
>    such as VND, VMM, and VSP are prerequisites for IPv6-based packet
>    exchange, transport-layer session continuity, and secure, safe
>    communication between a vehicle and a pedestrian either directly or
>    indirectly via an IP-RSU.
>
> >>> =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=9D doe=
s not parse.
> There=E2=80=99s
> no IPv6 reference that provides those functions. If the intention is to s=
ay
> that there=E2=80=99s stuff to add to IPv6 to support, like, say,  VND, th=
en this
> document fails to define how an IPv6 VND should behave, though it=E2=80=
=99s
> precisely
> what I=E2=80=99d expect from a problem statement.
>
> <snip>
>
> 4.  Vehicular Networks
>
> >>> What is the purpose of section 4 as a whole, problem statement or
> applicability statement of the listed protocols? In the former case what=
=E2=80=99s
> the
> problem? In the latter case it is incomplete and needs to be exported to =
an
> applicability statement doc with all the possible technologies evaluated.
>
>    This section describes an example vehicular network architecture
>    supporting V2V, V2I, and V2X communications in vehicular networks.
>
> >>> I read this as presenting a context to explain what the problems are
> instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe us=
ing the term
> =E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=99=
s comment.
>
> <snip>
>
> 4.1.  Vehicular Network Architecture
>
>    Figure 1 shows an example vehicular network architecture for V2I and
>    V2V in a road network [OMNI].
>
> a.      Is using OMNI a decision that the WG made for the future work ?
> what
> does it do and what does it not do? b.      Is there work left to be done=
?
> Who
> will do that work? Or is it the expectation that OMNI has it all defined
> already?
>
> <snip>
>
>    An existing network architecture (e.g., an IP-based aeronautical
>    network architecture [OMNI][UAM-ITS], a network architecture of
>    PMIPv6 [RFC5213], and a low-power and lossy network architecture
>    [RFC6550]) can be extended to a vehicular network architecture for
>    multihop V2V, V2I, and V2X, as shown in Figure 1.  In a highway
>    scenario, a vehicle may not access an RSU directly because of the
>    distance of the DSRC coverage (up to 1 km).  For example, the OMNI
>    interface and/or RPL (IPv6 Routing Protocol for Low-Power and Lossy
>    Networks) [RFC6550] can be extended to support a multihop V2I since a
>    vehicle can take advantage of other vehicles as relay nodes to reach
>    the RSU.  Also, RPL can be extended to support both multihop V2V and
>    V2X in the similar way.
>
> >>> all this could fit well in annex; anyway you need to explain what you
> expect the protocols to do and which extension is needed. In the case of
> RPL at
> least you indicate that it would do routing, but not why you cannot use i=
t
> of
> the shelf; for OMNI, what you expect is less clear, though there=E2=80=99=
s text
> elsewhere about the many radio interfaces that could be used for the
> purpose,
> and the text in the UAM below that is enlightening.
>
> <snip>
>
>                                   To support not only the mobility
>    management of the UAM end systems, but also the multihop and
>    multilink communications of the UAM interfaces, the UAM end systems
>    can employ an Overlay Multilink Network (OMNI) interface [OMNI] as a
>    virtual Non-Broadcast Multiple Access (NBMA) connection to a serving
>    ground domain infrastructure.
>
> >>> Again, what is the expectation for OMNI? As an overlay it requires an
> underlay; when connecting to a MANET it needs support for that MANET. The
> text
> above seems to imply that is solves everything in V2xyz like magic;
> reminds me
> of the IPv6 multicast abstraction that was supposed to solve the broadcas=
t
> problem and ended up worsening it.
>
> <snip>
>
>                             This infrastructure can be configured
>    over the underlying data links.  The OMNI interface and its link
>    model provide a means of multilink, multihop and mobility
>    coordination to the legacy IPv6 ND messaging [RFC4861] according to
>    the NBMA principle.  Thus, the OMNI link model can support efficient
>    UAM internetworking services without additional mobility messaging,
>    and without any modification to the IPv6 ND messaging services or
>    link model.
>
> >>> Again, what is the expectation for OMNI? As an overlay it requires an
> underlay; the text above seems to imply that is solves everything in V2xy=
z
> like
> magic; that would be a stretch, that reminds me of IPv6 multicast that wa=
s
> supposed to solve the broadcast problem and ended up worsening it.
>
> <snip>
>
>    Multiple vehicles under the coverage of an RSU share a prefix just as
>    mobile nodes share a prefix of a Wi-Fi access point in a wireless
>    LAN.  This is a natural characteristic in infrastructure-based
>    wireless networks.  For example, in Figure 1, two vehicles (i.e.,
>    Vehicle2, and Vehicle5) can use Prefix 1 to configure their IPv6
>    global addresses for V2I communication.  Alternatively, mobile nodes
>    can employ an OMNI interface and use their own IPv6 Unique Local
>    Addresses (ULAs) [RFC4193] over the wireless network without
>    requiring the messaging of IPv6 Stateless Address Autoconfiguration
>   (SLAAC) [RFC4862], which uses an on-link prefix provided by the
>    (visited) wireless LAN; this technique is known as "Bring-Your-Own-
>    Addresses".
>
> >>>  Is OMNI the only way to "Bring-Your-Own-Addresses=E2=80=9D? Else the=
 text
> could be
> more generic, at least use e.g., like the ref to AERO later. >>> What are
> the
> implications / limitations of doing that =E2=80=93 like they can do line =
of sight
> V2V
> but not reach the internet, or the need of  a local MANET / RPL that will
> accept to route those addresses, or the security / address ownership
> validation
> issues ?
>
> <snip>
>
>    A single subnet prefix announced by an RSU can span multiple vehicles
>    in VANET.  For example, in Figure 1, for Prefix 1, three vehicles
>    (i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a connected
>    VANET.  Also, for Prefix 2, two vehicles (i.e., Vehicle3 and
>    Vehicle6) can construct another connected VANET, and for Prefix 3,
>    two vehicles (i.e., Vehicle4 and Vehicle7) can construct another
>    connected VANET.  Alternatively, each vehicle could employ an OMNI
>    interface with their own ULAs such that no topologically-oriented
>    subnet prefixes need be announced by the RSU.
>
> >>>  same as above. This seems to restate the same thing, derive an addre=
ss
> from a topologically correct prefix or use your own with limitations to b=
e
> described.
>
> <snip>
>
>    For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]
>    specifies several details, including Maximum Transmission Unit (MTU),
>    frame format, link-local address, address mapping for unicast and
>    multicast, stateless autoconfiguration, and subnet structure.  An
>    Ethernet Adaptation (EA) layer is in charge of transforming some
>    parameters between the IEEE 802.11 MAC layer and the IPv6 network
>    layer, which is located between the IEEE 802.11-OCB's logical link
>    control layer and the IPv6 network layer.  This IPv6 over 802.11-OCB
>    can be used for both V2V and V2I in IPv6-based vehicular networks.
>
> >>>  solution space.
>
> <snip>
>
>    An IPv6 mobility solution is needed for the guarantee of
>    communication continuity in vehicular networks so that a vehicle's
>    TCP session can be continued, or UDP packets can be delivered to a
>    vehicle as a destination without loss while it moves from an IP-RSU's
>    wireless coverage to another IP-RSU's wireless coverage.  In
>    Figure 1, assuming that Vehicle2 has a TCP session (or a UDP session)
>    with a corresponding node in the vehicular cloud, Vehicle2 can move
>    from IP-RSU1's wireless coverage to IP-RSU2's wireless coverage.  In
>    this case, a handover for Vehicle2 needs to be performed by either a
>    host-based mobility management scheme (e.g., MIPv6 [RFC6275]) or a
>    network-based mobility management scheme (e.g., PMIPv6 [RFC5213] and
>    AERO [RFC6706BIS]).
>
>    In the host-based mobility scheme (e.g., MIPv6), an IP-RSU plays a
>    role of a home agent.  On the other hand, in the network-based
>    mobility scheme (e.g., PMIPv6, an MA plays a role of a mobility
>    management controller such as a Local Mobility Anchor (LMA) in
>    PMIPv6, which also serves vehicles as a home agent, and an IP-RSU
>    plays a role of an access router such as a Mobile Access Gateway
>    (MAG) in PMIPv6 [RFC5213].  The host-based mobility scheme needs
>    client functionality in IPv6 stack of a vehicle as a mobile node for
>    mobility signaling message exchange between the vehicle and home
>    agent.  On the other hand, the network-based mobility scheme does not
>    need such a client functionality for a vehicle because the network
>    infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility agent
>    handles the mobility signaling message exchange with the home agent
>    (e.g., LMA in PMIPv6) for the sake of the vehicle.
>
>    There are a scalability issue and a route optimization issue in the
>    network-based mobility scheme (e.g., PMIPv6) when an MA covers a
>    large vehicular network governing many IP-RSUs.  In this case, a
>    distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate the
>    scalability issue by distributing multiple MAs in the vehicular
>    network such that they are positioned closer to vehicles for route
>    optimization and bottleneck mitigation in a central MA in the
>    network-based mobility scheme.  All these mobility approaches (i.e.,
>    a host-based mobility scheme, network-based mobility scheme, and
>    distributed mobility scheme) and a hybrid approach of a combination
>    of them need to provide an efficient mobility service to vehicles
>    moving fast and moving along with the relatively predictable
>    trajectories along the roadways.
>
>    In vehicular networks, the control plane can be separated from the
>    data plane for efficient mobility management and data forwarding by
>    using the concept of Software-Defined Networking (SDN)
>    [RFC7149][DMM-FPC].  Note that Forwarding Policy Configuration (FPC)
>    in [DMM-FPC], which is a flexible mobility management system, can
>    manage the separation of data-plane and control-plane in DMM.  In
>    SDN, the control plane and data plane are separated for the efficient
>    management of forwarding elements (e.g., switches and routers) where
>    an SDN controller configures the forwarding elements in a centralized
>    way and they perform packet forwarding according to their forwarding
>    tables that are configured by the SDN controller.  An MA as an SDN
>    controller needs to efficiently configure and monitor its IP-RSUs and
>    vehicles for mobility management, location management, and security
>    services.
>
>    The mobility information of a GPS receiver mounted in its vehicle
>    (e.g., position, speed, and direction) can be used to accommodate
>    mobility-aware proactive handover schemes, which can perform the
>    handover of a vehicle according to its mobility and the wireless
>    signal strength of a vehicle and an IP-RSU in a proactive way.
>
>    Vehicles can use the TCC as their Home Network having a home agent
>    for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5213],
>    so the TCC (or an MA inside the TCC) maintains the mobility
>    information of vehicles for location management.  IP tunneling over
>    the wireless link should be avoided for performance efficiency.
>    Also, in vehicular networks, asymmetric links sometimes exist and
>    must be considered for wireless communications such as V2V and V2I.
>
> >>>  This is all very informative text but does not state a problem. Is
> there a
> problem is left to be solved or are we assessing the applicability of
> protocols? Could it for instance, forward point to issues discussed in
> section
> 5?
>
> <snip>
>
>    As shown in Figure 3, as internal networks, a vehicle's moving
>    network and an EN's fixed network are self-contained networks having
>    multiple subnets and having an edge router (e.g., IP-OBU and IP-RSU)
>    for the communication with another vehicle or another EN.  The
>    internetworking between two internal networks via V2I communication
>    requires the exchange of the network parameters and the network
>    prefixes of the internal networks.  For the efficiency, the network
>    prefixes of the internal networks (as a moving network) in a vehicle
>    need to be delegated and configured automatically.  Note that a
>    moving network's network prefix can be called a Mobile Network Prefix
>    (MNP) [OMNI].
>
> >>> Then again you=E2=80=99re overselling OMNI. MNP is originally defined=
 here
> https://datatracker.ietf.org/doc/html/rfc3963#section-2 and that=E2=80=99=
s a
> reference
> you can use normatively.
>
> <snip>
>
>    As shown in Figure 3, the addresses used for IPv6 transmissions over
>    the wireless link interfaces for IP-OBU and IP-RSU can be either
>    global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets can be
>    routed within vehicular networks [OMNI].
>
> >>> Then again you=E2=80=99re overselling OMNI. There needs to  be a rout=
ing
> protocol
> like a MANET that will accept to carry the
>  MNPs, and that must be implemented by the infra and both cars. The OMNI
> spec
>  is clear on that. This is why at first glance I see OMNI as a full mobil=
e
>  router in a bump in the stack. Now what is the problem behind this? No
> such
>  protocol at IETF? Too many to choose from? No deployment?
> <snip>
>
> When global IPv6 addresses
>    are used, wireless interface configuration and control overhead for
>    Duplicate Address Detection (DAD) [RFC4862] and Multicast Listener
>    Discovery (MLD) [RFC2710][RFC3810] should be minimized to support V2I
>    and V2X communications for vehicles moving fast along roadways; when
>    ULAs and the OMNI interface are used, no DAD nor MLD messaging is
>    needed.
>
> >>> Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it the no d=
ad needed a
> property
> of injecting a BYOA in the fabric for an GUA MIP Home Address which is
> known to
> be unique at home? >>> OTOH, autoconf=E2=80=99ing a random ULA =E2=80=9CF=
D=E2=80=A6=E2=80=9Dprefix has
> lesser
> DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classica=
l subnet.
> So
> who says DAD isn=E2=80=99t required for OMNI ULA? >>> note that IMHO DAD =
on
> wireless is
> a lot more harm than good, and I agree that with a good pseudo random
> generator
> the ULA has no chance to collision in the real world, as OMNI claims. It=
=E2=80=99s
> just
> that your argument here plays the other way, because there are less rando=
m
> bits
> (56)  in the ULA prefix than in the IID (62), and if one starts using mor=
e
> prefix bits to be non-random, there will be a time when DAD on prefix is
> needed.
>
> <snip>
>
>    Let us consider the upload/download time of a vehicle when it passes
>    through the wireless communication coverage of an IP-RSU.  For a
>    given typical setting where 1km is the maximum DSRC communication
>    range [DSRC] and 100km/h is the speed limit in highway, the dwelling
>    time can be calculated to be 72 seconds by dividing the diameter of
>    the 2km (i.e., two times of DSRC communication range where an IP-RSU
>    is located in the center of the circle of wireless communication) by
>    the speed limit of 100km/h (i.e., about 28m/s).  For the 72 seconds,
>    a vehicle passing through the coverage of an IP-RSU can upload and
>    download data packets to/from the IP-RSU.
>
> <snip>
>
> 4.3.  V2V-based Internetworking
>
> >>> In this section it looks like the cars are in a stable line of sight
> relationship. Which is probably fine for a platoon, but when you drive
> along
> with friends in different cars, you realize that the line of sight
> assumption
> does not stand over time. Soon enough, other cars meddle in, and possibly
> one
> of the cars drives faster and too far ahead so you need the infra to rela=
y,
> possibly over multiple infra hops.
>
> >>> so in this section, I=E2=80=99d expect to see a Vehicle communicating=
 with
> another
> one and using either line of sight or V2V relaying but also using relay
> via V2I
> (multihop I2I not just hub and spoke V2I2V ), alternatively to together f=
or
> redundancy. Is that part of the problem?
>
> >>> reading deeper section 5 I found excellent text on routing via V and
> via I.
> This tells that section 4 does not play a good role at justifying section
> 5.
> Maybe keep section 4 for another doc?
>
> >>> What kind or reliability is required in a V2V use case? Do you think
> ND can
> handle it? Or MANET? What would be the assumption on L2 (roaming time,
> unicast
> vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3
> redundancy?
>
> <snip>
>
> 5.  Problem Statement
>
> <snip>
>
>    In order to specify protocols using the architecture mentioned in
>    Section 4.1, IPv6 core protocols have to be adapted to overcome
>    certain challenging aspects of vehicular networking.  Since the
>    vehicles are likely to be moving at great speed, protocol exchanges
>    need to be completed in a time relatively short compared to the
>    lifetime of a link between a vehicle and an IP-RSU, or between two
>    vehicles.
>
> >>> Any order of magnitude?
> >>> Can you indicate whether this already rules out certain procedures,
> e.g.
> DAD ?
>
>    The lifetime of a session varies depending on the session's type such
>    as a web surfing, voice call over IP, and DNS query.  Regardless of a
>    session's type, to guide all the IPv6 packets to their destination
>    host, IP mobility should be supported for the session.
>
> >>> this seems to be for unicast when you know who to talk to. Is there a
> need
> some multicast groups like anybody around interested in topic blah like I
> could
> be multicasting the speed of vehicles coming the other way that I crossed
> recently, for use of vehicles that I=E2=80=99m crossing now, so they can =
see a
> slowdown
> on advance
>
>    Thus, the time constraint of a wireless link has a major impact on
>    IPv6 Neighbor Discovery (ND).  Mobility Management (MM) is also
>    vulnerable to disconnections that occur before the completion of
>    identity verification and tunnel management.  This is especially true
>    given the unreliable nature of wireless communication.  This section
>    presents key topics such as neighbor discovery and mobility
>    management.
>
> >>> Only ND? What about the MANET?
> >>> how fast should ND be to be suitable?
> >>> is there also a bandwidth check? You can make things much faster if y=
ou
> dedicate a lot of spectrum to it. But that can also be a waste.
>
> 5.1.  Neighbor Discovery
>
> <snip>
>
>    The requirements for IPv6 ND for vehicular networks are efficient DAD
>    and NUD operations.
>
> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast,
> which
> is a good idea in my book?
>
>  <snip>
>
>       This merging and partitioning should be considered for the
>    IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAAC)
>    [RFC4862].
>
> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast,
> which
> is a good idea in my book?
>
>  <snip>
>
>    Also, the partitioning of a VANET may make vehicles with the same
>    prefix be physically unreachable.  Also, SLAAC needs to prevent IPv6
>    address duplication due to the merging of VANETs.  According to the
>    merging and partitioning, a destination vehicle (as an IPv6 host)
>    needs to be distinguished as either an on-link host or an off-link
>    host even though the source vehicle uses the same prefix as the
>    destination vehicle.
>
> >>> should reference to draft-nordmark-intarea-ippl
>
>    To efficiently prevent IPv6 address duplication due to the VANET
>    partitioning and merging from happening in vehicular networks, the
>    vehicular networks need to support a vehicular-network-wide DAD by
>    defining a scope that is compatible with the legacy DAD.  In this
>    case, two vehicles can communicate with each other when there exists
>    a communication path over VANET or a combination of VANETs and IP-
>    RSUs, as shown in Figure 1.  By using the vehicular-network-wide DAD,
>    vehicles can assure that their IPv6 addresses are unique in the
>    vehicular network whenever they are connected to the vehicular
>    infrastructure or become disconnected from it in the form of VANET.
>
> >>> Excellent
>
>    ND time-related parameters such as router lifetime and Neighbor
>    Advertisement (NA) interval need to be adjusted for vehicle speed and
>    vehicle density.  For example, the NA interval needs to be
>    dynamically adjusted according to a vehicle's speed so that the
>    vehicle can maintain its neighboring vehicles in a stable way,
>    considering the collision probability with the NA messages sent by
>    other vehicles.
>
> >>> Is that a problem or just an operational setting that needs to be
> found?
> >>> Do we need to reconsider the concepts of those timers?
>
> <snip>
>
>    Thus, in IPv6-based vehicular networking, IPv6 ND should have minimum
>    changes for the interoperability with the legacy IPv6 ND used in the
>    Internet, including the DAD and NUD operations.
>
> >>> I do not find the logical link with the text before, why is this a
> =E2=80=9Cthus=E2=80=9D?
> >>> why should the ND inside the VANET be constrained to be interoperable=
?
> This
> may place constraints on the solution.
>
> 5.1.1.  Link Model
>
>    A prefix model for a vehicular network needs to facilitate the
>
> >>> Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=80=9Cp=
refix model=E2=80=9D.
> >>> it would make this piece and the next should refer to
> draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both
> link
> and subnet issues. The general ideas are the same, but the gory details
> here
> are slightly incorrect, like this notion of prefix model than comes out o=
f
> the
> blue. The model is really the subnet model for the subnet associated to
> P2MP.
>
>    communication between two vehicles with the same prefix regardless of
>    the vehicular network topology as long as there exist bidirectional
>    E2E paths between them in the vehicular network including VANETs and
>    IP-RSUs.  This prefix model allows vehicles with the same prefix to
>    communicate with each other via a combination of multihop V2V and
>    multihop V2I with VANETs and IP-RSUs.  Note that the OMNI interface
>    supports an NBMA link model where multihop V2V and V2I communications
>    use each mobile node's ULAs without need for any DAD or MLD
>    messaging.
>
> >>> again overselling OMNI.
> >>> I kinda agree about the OMNI interface model, nothing against that.
> But you
> must see that there needs a lot more than what the OMNI interface to get
> packets across V and I hops to the destination. Like routing ala MANET,
> redundancy handling ala DetNet because it will be very lossy, path
> management
> ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND so=
 it does
> not
> solve the ND problems above.
>
>    IPv6 protocols work under certain assumptions that do not necessarily
>    hold for vehicular wireless access link types other than OMNI/NBMA
>    [VIP-WAVE][RFC5889]; the rest of this section discusses implications
>    for those link types that do not apply when the OMNI/NBMA link model
>
> >>> again overselling OMNI.
> >>> The keyword here is P2MP / NBMA, and OMNI is one interface that accep=
ts
> that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already P=
2MP /
> NBMA,
> using routing to complete the partial mesh in P2MP. The text seems to imp=
ly
> that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI =
is loaded
> with
> other stuff than a plain P2MP capable interface. And ND over P2MP is not
> done
> by OMNI, OMNI only makes classical ND worse and only works in a full mesh=
.
> OTOH
> RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work ver=
y
> well
> within an OMNI interface and solve those problems. >>> My point is that y=
ou
> need to tell the full story or refrain from entering solution space in
> this doc
>
> <snip>
>
>    There is a relationship between a link and a prefix, besides the
>    different scopes that are expected from the link-local and global
>    types of IPv6 addresses.  In an IPv6 link, it is assumed that all
>    interfaces which are configured with the same subnet prefix and with
>    on-link bit set can communicate with each other on an IPv6 link.
>
> >>> not assumed; that=E2=80=99s what the onlink but set tells. The conclu=
sion
> should be
> that the VANET cannot set the O bit.
>
>    However, the vehicular link model needs to define the relationship
>    between a link and a prefix, considering the dynamics of wireless
>    links and the characteristics of VANET.
>
> <snip>
>
>    From the previous observation, a vehicular link model should consider
>    the frequent partitioning and merging of VANETs due to vehicle
>    mobility.  Therefore, the vehicular link model needs to use an on-
>    link prefix and off-link prefix according to the network topology of
>    vehicles such as a one-hop reachable network and a multihop reachable
>
> >>> No, the once a node saw a O bit set that sticks even if it sees other
> advertisements of the PIO with the O bit not set. >>> This is a global an=
d
> intrinsic property of the prefix (and an attack vector that could be
> mentioned
> in the sec section). >>> the VANET prefix must never come with the O bit
> set.
>
> <snip>
>
>    network (or partitioned networks).  If the vehicles with the same
>    prefix are reachable from each other in one hop, the prefix should be
>    on-link.
>
> >>>> No, see above; but the router may redirect though it is really risky
> unless this is a stable situation like a parking place.
>
>    Thus, in IPv6-based vehicular networking, the vehicular link model
>    should have minimum changes for interoperability with standard IPv6
>    links in an efficient fashion to support IPv6 DAD, MLD and NUD
>    operations.  When the OMNI NBMA link model is used, there are no link
>    model changes nor DAD/MLD messaging required.
>
> >>>> again overselling OMNI.
> >>>> You need a good P2MP subnet model with routing support when the mesh
> is
> partial. My company alone has been shipping million of nodes that build
> subnets
> of thousands, and that was done using IETF standards.
>
> <snip>
>
>    For vehicular networks with high mobility and density, the DAD needs
>    to be performed efficiently with minimum overhead so that the
>    vehicles can exchange a driving safety message (e.g., collision
>    avoidance and accident notification) with each other with a short
>    interval (e.g., 0.5 second) by a technical report from NHTSA
>    (National Highway Traffic Safety Administration) [NHTSA-ACAS-Report].
>    Such a driving safety message may include a vehicle's mobility
>    information (i.e., position, speed, direction, and acceleration/
>    deceleration).  The exchange interval of this message is 0.5 second,
>    which is required to allow a driver to avoid a rear-end crash from
>    another vehicle.
>
> >>> IPv6 over broadcast MAC (used to be called internet 0, 10+ years ago)
> solves that MAC issue since there is no MAC.
>
> 5.1.3.  Routing
>
>    For multihop V2V communications in either a VANET or VANETs via IP-
>    RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing protocol may
>    be required to support both unicast and multicast in the links of the
>    subnet with the same IPv6 prefix.  However, it will be costly to run
>    both vehicular ND and a vehicular ad hoc routing protocol in terms of
>    control traffic overhead [ID-Multicast-Problems].
>
> >>> we do that with IETF standards on battery operated devices already.
> Using
> RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve s=
een 30
> hops in
> meshes of thousands in the real world though it=E2=80=99s not the normal
> operational
> model, but can happen to maintain connectivity during the reboot of a
> root) and
> does not use broadcast. RPL was initially designed as a V2V2V protocol bu=
t
> found its market on the IoT. I=E2=80=99m sure the protocol would gladly c=
ome back
> to
> its roots.
>
>    A routing protocol for a VANET may cause redundant wireless frames in
>    the air to check the neighborhood of each vehicle and compute the
>    routing information in a VANET with a dynamic network topology
>    because the IPv6 ND is used to check the neighborhood of each
>    vehicle.  Thus, the vehicular routing needs to take advantage of the
>    IPv6 ND to minimize its control overhead.
>
> >>> A clean description of the interaction of RPL and RFC 8505 in our IoT
> networks. Note that the speed of the PHY in VANET balanced the instabilit=
y
> of
> the topology, and RPL still applies. Note also that RPL uses DV with a
> routing
> stretch in order to minimize the topology awareness that=E2=80=99s needed=
 in each
> node,
> which results in minimal signaling.
>
> 5.2.  Mobility Management
>
> <snip>
>
>    For a mobility management scheme in a shared link, where the wireless
>    subnets of multiple IP-RSUs share the same prefix, an efficient
>    vehicular-network-wide DAD is required.  If DHCPv6 is used to assign
>    a unique IPv6 address to each vehicle in this shared link,
>
> >>> I would not use the term link, or shared. Maybe shared link -> domain=
?
> <snip>
>
> the DAD is
>    not required.  On the other hand, for a mobility management scheme
>    with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] and OMNI
>    [OMNI]), DAD is not required because the IPv6 address of a vehicle's
>    external wireless interface is guaranteed to be unique.
>
> >>> again overselling OMNI
> >>> As I said earlier, this is wring there are (64*) more chances of a
> collision in OMNI prefixes than in IPv6 IIDs. >>> OMNI prefixes can
> collision,
> home addresses that are unique on a home network cannot. >>> Now if both
> the
> OMNI prefix and the IID are good randoms, then obviously, the chances of
> collisions round up to 0. >>> Collision is certainly not my worst fear.
>
>   There is a
>    tradeoff between the prefix usage efficiency and DAD overhead.  Thus,
>    the IPv6 address autoconfiguration for vehicular networks needs to
>    consider this tradeoff to support efficient mobility management.
>
> >>> This is way too superficial and hides the reality of things.
> - Using a VANET Infra prefix allows direct routability to the internet
> which
> BYOA does not since the BYOA is not topologically correct. Yes, it costs =
a
> DAD
> with classic ND, but it does not with RCF8505 and the draft fails to
> mention
> that. - A BYOA needs a tunnel home, and the node needs to know who is
> reachable
> inside the VANET and what is not to decide to tunnel or not; this is a
> difficult problem (vs. control place overhead) that is not discussed here=
.
>
> <snip>
>
>    For the case of a multihomed network, a vehicle can follow the first-
>    hop router selection rule described in [RFC8028].  That is, the
>    vehicle should select its default router for each prefix by
>    preferring the router that advertised the prefix.
>
> >>> Still router discovery (in and out) must be very fast. Thing of the R=
A
> intervale in MIPv6. Is that sufficient? Too expensive?
>
> <snip>
>
> 6.  Security Considerations
> >>> Any discussion on the security of classical ND and other operational
> issues
> (rfc6583) ?
>
> <snip>
>
>    Security and privacy are paramount in V2I, V2V, and V2X networking.
>    Vehicles and infrastructure must be authenticated in order to
>    participate in vehicular networking.  Also, in-vehicle devices (e.g.,
>    ECU) and a driver/passenger's mobile devices (e.g., smartphone and
>    tablet PC) in a vehicle need to communicate with other in-vehicle
>    devices and another driver/passenger's mobile devices in another
>    vehicle, or other servers behind an IP-RSU in a secure way.  Even
>    though a vehicle is perfectly authenticated and legitimate, it may be
>    hacked for running malicious applications to track and collect its
>    and other vehicles' information.  In this case, an attack mitigation
>    process may be required to reduce the aftermath of malicious
>    behaviors.
>
> >>> The section should mention that both with classical ND and BYOA,
> addresses
> can be impersonated, and RFC 8928 protects against that in both cases whi=
le
> maintaining privacy.
>
>    Even though vehicles can be authenticated with valid certificates by
>    an authentication server in the vehicular cloud, the authenticated
>
> >>> Is PKI feasible (deploying it in every car?). Is it fast enough? Is i=
t
> really what IPWAVE thinks vehicle should use????? >>> e.g. why would one
> need
> to authenticate to a V2I network? >>> from the text earlier in the doc, i=
t
> seemed that what you really want is access that is fast to join, capable =
of
> offering the reachability you want, anonymous, and innocuous (cars can no=
t
> harm
> one another).
>
>    vehicles may harm other vehicles, so their communication activities
>    need to be logged in either a central way through a logging server
>    (e.g., TCC) in the vehicular cloud or a distributed way (e.g.,
>    blockchain [Bitcoin]) along with other vehicles or infrastructure.
>    For the non-repudiation of the harmful activities of malicious nodes,
>    a blockchain technology can be used [Bitcoin].  Each message from a
>    vehicle can be treated as a transaction and the neighboring vehicles
>    can play the role of peers in a consensus method of a blockchain
>    [Bitcoin][Vehicular-BlockChain].  For a blockchain's efficient
>    consensus in vehicular networks having fast moving vehicles, a new
>    consensus algorithm needs to be developed or an existing consensus
>    algorithm needs to be enhanced.
>
> >>> solution space; better express the  security needs since this is a PS=
.
>
> <snip>
>
>    To identify malicious vehicles among vehicles, an authentication
>    method is required.
>
> >>> No. As said earlier a vehicle can be infected. You need
> innocuousness.which
> can come from things like isolation, zerotrust, and protocols that are
> difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 is
> protected by construction, anonymous, and fast.
>
> <snip>
>
>    For the setup of a secure channel over IPsec or TLS, the multihop V2I
>    communications over DSRC is required in a highway for the
>    authentication by involving multiple intermediate vehicles as relay
>    nodes toward an IP-RSU connected to an authentication server in the
>    vehicular cloud.  The V2I communications over 5G V2X (or LTE V2X) is
>    required to allow a vehicle to communicate directly with a gNodeB (or
>    eNodeB) connected to an authentication server in the vehicular cloud.
>
> >>> solution space. Instead, you could mention that setting up secured
> channels
> between cars that cross one another might not complete in time to
> establish the
> communication channel, and that the innocuousness must come from zerotrus=
t
> in
> the transactions between the cars.
>    For the IPv6 ND, the DAD is required to ensure the uniqueness of the
>    IPv6 address of a vehicle's wireless interface.
>
> >>> for classical ND (SLAAC) that=E2=80=99s true. That is not with RFC 85=
05, since
> the
> infra maintains a table of all addresses in use in the prefix and blocks
> duplicates without the RFC 4862 DAD method. The stateful autoconf address
> grant
> is immediate.
>
>                                This DAD can be used
>    as a flooding attack that uses the DAD-related ND packets
>    disseminated over the VANET or vehicular networks.
>
> >>> also for DOS attacks. You can block a owner from using an address. A
> reference to rfc6959 is much needed here.
>
> <snip>
>
>  This possibility
>    indicates that the vehicles and IP-RSUs need to filter out suspicious
>    ND traffic in advance.  Based on the SEND [RFC3971] mechanism, the
>    authentication for routers (i.e., IP-RSUs) can be conducted by only
>    selecting an IP-RSU that has a certification path toward trusted
>    parties.  For authenticating other vehicles, the cryptographically
>    generated address (CGA) can be used to verify the true owner of a
>    received ND message, which requires to use the CGA ND option in the
>    ND protocols.  For a general protection of the ND mechanism, the RSA
>    Signature ND option can also be used to protect the integrity of the
>    messages by public key signatures.  For a more advanced
>    authentication mechanism, a distributed blockchain-based mechanism
>    [Vehicular-BlockChain] can be used.
>
> >>> solution space. Again, the draft should focus on problems and needs.
> The
> problem here is that SEND is complex, and not implemented in the major
> stack.
> It relies on PKI for trusting the router. The V2I need is a zerotrust mod=
el
> where one V, the other local Vs, and the I, can help each other
> anonymously and
> harmlessly. <snip>
>
> 8.  Informative References
>
> >>> no normative reference?
>
> >>> no normative reference?
>
> <snip>
>
> Voila!
>
> Keep safe;
>
> Pascal
>
>
>
> _______________________________________________
> its mailing list
> its@ietf.org
> https://www.ietf.org/mailman/listinfo/its
>
>

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<div dir=3D"ltr">Hi Pascal,<div>I have reflected your comments on=C2=A0the =
revision:</div><div><a href=3D"https://datatracker.ietf.org/doc/html/draft-=
ietf-ipwave-vehicular-networking-22">https://datatracker.ietf.org/doc/html/=
draft-ietf-ipwave-vehicular-networking-22</a><br></div><div><br></div><div>=
Though the text provided by you is excellent, it is long, so I place it on =
Appendix B:</div><div><a href=3D"https://datatracker.ietf.org/doc/html/draf=
t-ietf-ipwave-vehicular-networking-22#appendix-B">https://datatracker.ietf.=
org/doc/html/draft-ietf-ipwave-vehicular-networking-22#appendix-B</a><br></=
div><div><br></div><div>In Section=C2=A05.1.3.=C2=A0 Routing, I explain RPL=
 concisely along with pros and cons:</div><div><a href=3D"https://datatrack=
er.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networking-22#section-5.1.=
3">https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networ=
king-22#section-5.1.3</a><br></div><div><br></div><div>The changes with my =
some editings look like the following:</div><div>--------------------------=
---------------------------------------------------------------------------=
-----------------</div><div>5.1.3. Routing<br>...<br>RPL [RFC6550] defines =
a routing protocol for low-power and lossy networks, which constructs and</=
div><div>maintains DODAGs optimized by an Objective Function (OF). A define=
d OF provides route selection</div><div>and optimization within an RPL topo=
logy. A node in a DODAG uses DODAG Information Objects (DIOs)</div><div>mes=
sages to discover and maintain the upward routes toward the root node. Refe=
r to Appendix B for</div><div>the detailed description of RPL for multihop =
V2X networking.<br>...<br>----------<br>Appendix B. Support of Multihop V2X=
 Networking<br>...<br>RPL is primarily designed to minimize the control pla=
ne activity, which is the relative amount of routing</div><div>protocol exc=
hanges versus data traffic; this approach is beneficial for situations wher=
e the power and</div><div>bandwidth are scarce (e.g., an IoT LLN where RPL =
is typically used today), but also in situations of</div><div>high relative=
 mobility between the nodes in the network (also known as swarming, e.g., w=
ithin a</div><div>variable set of vehicles with a similar global motion, or=
 a variable set of drones flying toward the same</div><div>direction).<br><=
br>To reduce the routing exchanges, RPL leverages a Distance Vector approac=
h, which does not need a</div><div>global knowledge of the topology, and on=
ly optimizes the routes to and from the root, allowing</div><div>Peer-to-Pe=
er (P2P) paths to be stretched. Although RPL installs its routes proactivel=
y, it only maintains</div><div>them lazily, that is, in reaction to actual =
traffic, or as a slow background activity. Additionally, RPL</div><div>leve=
rages the concept of an objective function (called OF), which allows to ada=
pt the activity of the</div><div>routing protocol to use cases, e.g., type,=
 speed, and quality of the radios. RPL does not need converge,</div><div>an=
d provides connectivity to most nodes most of the time. The default route t=
oward the root is</div><div>maintained aggressively and may change while a =
packet progresses without causing loops, so the</div><div>packet will still=
 reach the root. There are two modes for routing in RPL such as non-storing=
 mode and</div><div>storing mode. In non-storing mode, a node inside the me=
sh/swarm that changes its point(s) of</div><div>attachment to the graph inf=
orms the root with a single unicast packet flowing along the default route,=
</div><div>and the connectivity is restored immediately; this mode is prefe=
rable for use cases where Internet</div><div>connectivity is dominant. On t=
he other hand, in storing mode, the routing stretch is reduced, for a</div>=
<div>better P2P connectivity, while the Internet connectivity is restored m=
ore slowly, during the time for</div><div>the DV operation to operate hop-b=
y-hop. While an RPL topology can quickly scale up and down and</div><div>fi=
ts the needs of mobility of vehicles, the total performance of the system w=
ill also depend on how</div><div>quickly a node can form an address, join t=
he mesh (including Authentication, Authorization, and</div><div>Accounting =
(AAA)), and manage its global mobility to become reachable from another nod=
e outside</div><div>the mesh.<br>...<br></div><div>------------------------=
---------------------------------------------------------------------------=
-------------------<br></div><div><br></div><div>If you=C2=A0have further c=
omments, please let me know.</div><div><br></div><div>Thanks.</div><div><br=
></div><div>Best Regards,</div><div>Paul</div></div><br><div class=3D"gmail=
_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Sep 2, 2021 at 3:49 P=
M Pascal Thubert (pthubert) &lt;<a href=3D"mailto:pthubert@cisco.com">pthub=
ert@cisco.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddi=
ng-left:1ex">





<div lang=3D"EN-US" style=3D"overflow-wrap: break-word;">
<div class=3D"gmail-m_-65818725454620154WordSection1">
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Hello Paul<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">This is absolutely excellent. I=E2=80=99m very happy will all =
the changes and your attached pdf made my life as a reviewer a lot simpler.
<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">This is really a great way of progressing together. Many thank=
s for that!<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">I=E2=80=99m all good but for a little snippet in the new text =
which is actually incorrect, and denotes a usual misunderstanding of RPL th=
at your doc may help correct for the future:<u></u><u></u></span></font></p=
>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Although RPL can be used in IPv6-based veh=
icular networks, it is primarily designed for lossy<u></u><u></u></span></f=
ont></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">networks, which puts energy efficiency fir=
st. In addition, the topology it considers may not<u></u><u></u></span></fo=
nt></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">quickly scale up and down for IPv6-based v=
ehicular networks, since the mobility of vehicles is<u></u><u></u></span></=
font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">much more diverse with a high speed, so it=
 can frequently alter a tree-like topology formed by<u></u><u></u></span></=
font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">RPL, which may cause network fragmentation=
 and merging with more control traffic<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">The roots of my contribution to RPL are in=
 vehicular networks, exactly the use case you describe. Based on that exper=
ience (including some actual test with
 NASA) I=E2=80=99d change the text above with:<u></u><u></u></span></font><=
/p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">RPL is primarily designed to minimize the =
control plane activity, that is the relative amount of routing protocol exc=
hanges vs. data traffic; this approach
 is beneficial for situations where the power and bandwidth are scarce (e.g=
., an IoT LLN where RPL is typically used today), but also in situations of=
 high relative mobility between the nodes in the network (aka swarming, e.g=
., within a variable set of vehicles
 with a similar global motion, or a toon of drones).<u></u><u></u></span></=
font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">To reduce the routing exchanges, RPL lever=
ages a Distance Vector approach, which does not need a global knowledge of =
the topology,
 and only optimizes the routes to and from the root, allowing P2P paths to =
be stretched. Although RPL installs its routes proactively, it only maintai=
ns them lazily, in reaction to actual traffic, or as a slow background acti=
vity. Additionally, RPL leverages
 the concept of an objective function, which allows to adapt the activity o=
f the routing protocol to the use case, e.g., type, speed, and quality of t=
he radios. RPL does not need converge, and provides connectivity to most no=
des most of the time. The default
 route towards the Root is maintained aggressively and may change while a p=
acket progresses without causing loops, so the packet will still reach the =
root. In non-storing mode, a node inside the mesh/swarm that changes its po=
int(s) of attachment to the graph
 informs the root with a single unicast packet the flows along the default =
route, and the connectivity is restored immediately; this mode is preferabl=
e for use cases where internet connectivity is dominant. OTOH, in storing m=
ode, the routing stretch is reduced,
 for a better P2P connectivity, while the internet connectivity is restored=
 more slowly, time for the DV operation to operate hop-by-hop. While a RPL =
topology can quickly scale up and down and fits the needs of mobility of ve=
hicles, the total performance of
 the system will also depend on how quickly a node can form an address, joi=
n the mesh (including AAA), and manage its global mobility to become reacha=
ble from outside the mesh.<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Otherwise, all good!<u></u><u></u></span><=
/font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Take care,<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Pascal<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0cm 0cm 0cm 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><span style=3D"=
font-size:11pt;font-weight:bold">From:</span></font></b> Mr. Jaehoon Paul J=
eong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" target=3D"_blank">jaehoo=
n.paul@gmail.com</a>&gt;
<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> lundi 30 ao=C3=BBt 202=
1 15:12<br>
<b><span style=3D"font-weight:bold">To:</span></b> Pascal Thubert (pthubert=
) &lt;<a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisc=
o.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Cc:</span></b> <a href=3D"mailto:int-di=
r@ietf.org" target=3D"_blank">int-dir@ietf.org</a>; Last Call &lt;<a href=
=3D"mailto:last-call@ietf.org" target=3D"_blank">last-call@ietf.org</a>&gt;=
; <a href=3D"mailto:draft-ietf-ipwave-vehicular-networking.all@ietf.org" ta=
rget=3D"_blank">draft-ietf-ipwave-vehicular-networking.all@ietf.org</a>; <a=
 href=3D"mailto:its@ietf.org" target=3D"_blank">its@ietf.org</a>; Russ Hous=
ley &lt;<a href=3D"mailto:housley@vigilsec.com" target=3D"_blank">housley@v=
igilsec.com</a>&gt;; CARLOS JESUS BERNARDOS CANO &lt;<a href=3D"mailto:cjbc=
@it.uc3m.es" target=3D"_blank">cjbc@it.uc3m.es</a>&gt;; skku-iotlab-members
 &lt;<a href=3D"mailto:skku-iotlab-members@googlegroups.com" target=3D"_bla=
nk">skku-iotlab-members@googlegroups.com</a>&gt;; Chris Shen &lt;<a href=3D=
"mailto:shenyiwen7@gmail.com" target=3D"_blank">shenyiwen7@gmail.com</a>&gt=
;; Mr. Jaehoon Paul Jeong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" tar=
get=3D"_blank">jaehoon.paul@gmail.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Subject:</span></b> Re: [ipwave] Intdir=
 last call review of draft-ietf-ipwave-vehicular-networking-20<u></u><u></u=
></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Hi Pascal,<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Here is the revision (-21) of IPWAVE PS Draft:<u></u><u></u></=
span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-ip=
wave-vehicular-networking-21" target=3D"_blank">https://datatracker.ietf.or=
g/doc/html/draft-ietf-ipwave-vehicular-networking-21</a><u></u><u></u></spa=
n></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">I attach the revision letter to show how I have addressed your=
 comments on the revision.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Chris and I have worked for this revision together.<u></u><u><=
/u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">If you have further comments, please let me know.<u></u><u></u=
></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Thanks.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Best Regards,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Paul<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert via Datatracker=
 &lt;<a href=3D"mailto:noreply@ietf.org" target=3D"_blank">noreply@ietf.org=
</a>&gt; wrote:<u></u><u></u></span></font></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4=
.8pt;margin-right:0cm">
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Reviewer: Pascal Thubert<br>
Review result: Not Ready<br>
<br>
Dear authors<br>
<br>
In summary:<br>
<br>
I read a number of very good drafts collated in one, from the use cases tha=
t<br>
very complete and ready to publish, to the architecture and protocol soluti=
on<br>
in section 4 that would require more work for completeness.<br>
<br>
There are multiple instances in the use cases where protocols are listed co=
ming<br>
out of the blue, e.g., the references to OMNI that seem artificially spread=
<br>
regardless of the context of the section. OMNI is used throughout, both as =
an<br>
open ended toolbox, and as a carpet under which all problems can be hidden.=
<br>
<br>
Reading this doc, OMNI shows as an interface to a software mobile router, w=
ith<br>
multiple of the device physical interfaces connected to the mobile router. =
This<br>
makes the stack very simple as the complexity moves to the router. But now =
you<br>
have to implement the router. Presented as that, the OMNI router deserves i=
ts<br>
name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANET (=
many to<br>
choose from) and NEMO (and all the MIP protocol family across address<br>
families), all the possible radio interfaces on which the ND problems go aw=
ay<br>
by magic, and whatever else you want to put in there. Is that the intention=
?<br>
<br>
Instead of referring to OMNI for virtually anything, the doc should refer t=
o<br>
MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),<br>
draft-nordmark-intarea-ippl for split subnets, and<br>
draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet models.=
 And<br>
then you can say that all those components can be plugged in the OMNI route=
r,<br>
and you can discuss which MANET and which MIP you want, including using OMN=
I=E2=80=99s<br>
built in mobility.<br>
<br>
Note that my objections are not against the OMNI design, it might be the<br=
>
perfect thing and I am already aware of use cases that could be served by a=
<br>
P2MP interface like OMNI in conjunction with RFC8505 on the P2P subinterfac=
es<br>
(recycling the high level design we=E2=80=99ve been shipping for IPv4 / fra=
me relay for<br>
the last 30 years). My objection is of the way the draft uses [OMNI] as the=
<br>
magic wand that solves all the problems when what you really do is throw th=
em<br>
over the fence. I=E2=80=99d rather you focus on problems and use cases, for=
 which<br>
there=E2=80=99s excellent text, and indicate what needs to be done without =
making<br>
assumption on how the needful things will be solved.<br>
<br>
In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to spl=
it, keep all<br>
that=E2=80=99s use case and problem description and ship it, remove referen=
ces to<br>
protocols envisioned in the solution, and start the work on architecture of=
 the<br>
solution and the protocol applicability statements separately. An alternate=
<br>
would be to centralize the discussion on protocols to annex, and explain th=
at<br>
protocol A or B could be envisioned in solution space because to over this =
gap<br>
or implement that function.<br>
<br>
In any fashion, the current text is not ready for publication as applicabil=
ity<br>
statement, architecture and or/solution, so the related work should be remo=
ved<br>
from the main text. But I find it mostly ready for use case and problem<br>
statement, more below.<br>
<br>
Review:<br>
<br>
Abstract<br>
<br>
=C2=A0 =C2=A0This document discusses the problem statement and use cases of=
<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for Intelligent Transportation=
<br>
=C2=A0 =C2=A0Systems (ITS).<br>
<br>
&gt;&gt;&gt; The document goes beyond that; there was actually a thread at =
6MAN where<br>
Bob Hinden said =E2=80=9C This document says it is a problem statement, but=
 then<br>
becomes a solution document.=C2=A0 =C2=A0Might be better to cut it down to =
only the<br>
problem statement part. =E2=80=9C &gt;&gt;&gt; Would you consider doing thi=
s? If not, why? Note:<br>
you may want to respond on 6MAN as well. &gt;&gt;&gt; &gt;&gt;&gt;I would h=
ave thought that the<br>
traditional steps of problem statement and applicability statement of exist=
ing<br>
work could be expected from IPWAVE too. &gt;&gt;&gt; Please clarify the ste=
ps that you<br>
intend to follow next with this work.<br>
<br>
&lt;snip&gt;<br>
<br>
1.=C2=A0 Introduction<br>
<br>
&gt;&gt;&gt; Very readable and informative section, many thanks!<br>
<br>
=C2=A0 =C2=A0Along with these WAVE standards and C-V2X standards, regardles=
s of a<br>
=C2=A0 =C2=A0wireless access technology under the IP stack of a vehicle, ve=
hicular<br>
=C2=A0 =C2=A0networks can operate IP mobility with IPv6 [RFC8200] and Mobil=
e IPv6<br>
=C2=A0 =C2=A0protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (P=
MIPv6)<br>
=C2=A0 =C2=A0[RFC5213], Distributed Mobility Management (DMM) [RFC7333], Lo=
cator/<br>
=C2=A0 =C2=A0ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Ext=
ended<br>
=C2=A0 =C2=A0Route Optimization (AERO) [RFC6706BIS]).<br>
<br>
&gt;&gt;&gt; NEMO (RFC 3963) is not cited. Any reason why the vehicle would=
 not<br>
transport a network?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0This document describes use cases and a problem statement abou=
t<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for ITS, which is named IPv6 W=
ireless<br>
=C2=A0 =C2=A0Access in Vehicular Environments (IPWAVE).=C2=A0 First, it int=
roduces the<br>
=C2=A0 =C2=A0use cases for using V2V, V2I, and V2X networking in ITS.=C2=A0=
 Next, for<br>
=C2=A0 =C2=A0IPv6-based vehicular networks, it makes a gap analysis of curr=
ent<br>
=C2=A0 =C2=A0IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Manage=
ment,<br>
=C2=A0 =C2=A0and Security &amp; Privacy), and then enumerates requirements =
for the<br>
=C2=A0 =C2=A0extensions of those IPv6 protocols, which are tailored to IPv6=
-based<br>
=C2=A0 =C2=A0vehicular networking.=C2=A0 Thus, this document is intended to=
 motivate<br>
=C2=A0 =C2=A0development of key protocols for IPWAVE.<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
2.=C2=A0 Terminology<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0o=C2=A0 IP-OBU: &quot;Internet Protocol On-Board Unit&quot;: A=
n IP-OBU denotes a<br>
=C2=A0 =C2=A0 =C2=A0 computer situated in a vehicle (e.g., car, bicycle, au=
tobike,<br>
=C2=A0 =C2=A0 =C2=A0 motor cycle, and a similar one) and a device (e.g., sm=
artphone and<br>
=C2=A0 =C2=A0 =C2=A0 IoT device).=C2=A0 It has at least one IP interface th=
at runs in IEEE<br>
=C2=A0 =C2=A0 =C2=A0 802.11-OCB and has an &quot;OBU&quot; transceiver.=C2=
=A0 Also, it may have an IP<br>
=C2=A0 =C2=A0 =C2=A0 interface that runs in Cellular V2X (C-V2X) [TS-23.285=
-3GPP]<br>
=C2=A0 =C2=A0 =C2=A0 [TR-22.886-3GPP][TS-23.287-3GPP].=C2=A0 See the defini=
tion of the term<br>
=C2=A0 =C2=A0 =C2=A0 &quot;OBU&quot; in [RFC8691].<br>
<br>
&gt;&gt;&gt; Can that be a router connecting multiple computers?<br>
<br>
&lt;snip&gt;<br>
<br>
3.=C2=A0 Use Cases<br>
<br>
&gt;&gt;&gt; This is another great read and an enlightening section. Maybe =
mention in<br>
the abstract that the doc also covers use cases?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Although a Layer-2 solution can provide a support for multihop=
<br>
=C2=A0 =C2=A0communications in vehicular networks, the scalability issue re=
lated<br>
=C2=A0 =C2=A0to multihop forwarding still remains when vehicles need to<br>
=C2=A0 =C2=A0disseminate or forward packets toward multihop-away destinatio=
ns.=C2=A0 In<br>
=C2=A0 =C2=A0addition, the IPv6-based approach for V2V as a network layer p=
rotocol<br>
=C2=A0 =C2=A0can accommodate multiple radio technologies as MAC protocols, =
such as<br>
=C2=A0 =C2=A05G V2X and DSRC.=C2=A0 Therefore, the existing IPv6 protocol c=
an be<br>
=C2=A0 =C2=A0augmented through the addition of an Overlay Multilink Network=
 (OMNI)<br>
=C2=A0 =C2=A0Interface [OMNI] and/or protocol changes in order to support b=
oth<br>
=C2=A0 =C2=A0wireless single-hop/multihop V2V communications and multiple r=
adio<br>
=C2=A0 =C2=A0technologies in vehicular networks.=C2=A0 In such a way, vehic=
les can<br>
=C2=A0 =C2=A0communicate with each other by V2V communications to share eit=
her an<br>
=C2=A0 =C2=A0emergency situation or road hazard in a highway having multipl=
e kinds<br>
=C2=A0 =C2=A0of radio technologies, such as 5G V2X and DSRC.<br>
<br>
&gt;&gt;&gt; This text appears in the middle of high level use case, with a=
 crude list<br>
of protocols; this is not a place for it<br>
<br>
&gt;&gt;&gt; On a 6MAN Thread, Brian Carpenter said that the above:<br>
=E2=80=9C<br>
is of concern regardless of the mention of OMNI. Does it mean &quot;can be&=
quot; or<br>
&quot;needs to be&quot;? This paragraph seems like a very short summary of =
a big problem<br>
area. At the end of page 13 there is some related discussion, which mention=
s<br>
RPL as part of the solution (good choice, IMHO) but again seems to depend o=
n<br>
OMNI. I don&#39;t think the fix of simply removing references to OMNI works=
,<br>
because it would leave a gap. In an informational document, that is not a<b=
r>
formal problem but as far as this draft describes architecture, I don&#39;t=
 think<br>
that big a gap is reasonable. &quot;OMNI&quot; is mentioned more than 20 ti=
mes in the<br>
document. There are also several references to AERO, which is strongly<br>
associated with OMNI. =E2=80=9C &gt;&gt;&gt; I agree with Brian. Here the d=
ocument seems to be<br>
mixing solution with problem and putting the cart before the horse. My<br>
recommendation is to stick to what needs to be done that IPv6 does not do y=
et<br>
-the reqs and gaps-; but the doc should not step in the how things will be =
done<br>
unless the group already decided to do it. The logical next steps to a PS a=
re<br>
an applicability statement of existing work, and if the gaps cannot be fill=
ed,<br>
there may be one or more WG chartered to fill those gaps.<br>
<br>
&gt;&gt;&gt; I=E2=80=99d still be happy to see an annex with leads on where=
 the solution might<br>
come from like RFC 8691 does.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2I communications in a highway where RSUs a=
re<br>
=C2=A0 =C2=A0sparsely deployed, so a vehicle can reach the wireless coverag=
e of an<br>
=C2=A0 =C2=A0RSU through the multihop data forwarding of intermediate vehic=
les.<br>
=C2=A0 =C2=A0Thus, IPv6 needs to be extended for multihop V2I communication=
s.<br>
<br>
&gt;&gt;&gt; Note that I have no clue on how well OMNI applies in that spac=
e, maybe it<br>
does very well; but here it comes out of the blue with no justification. If=
 you<br>
mention OMNI you need to detail what it is and which of the V2V=C2=A0 probl=
ems you<br>
expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2X (or V2I2X) communications in an urban ro=
ad<br>
=C2=A0 =C2=A0network where RSUs are deployed at intersections, so a vehicle=
 (or a<br>
=C2=A0 =C2=A0pedestrian&#39;s smartphone) can reach the wireless coverage o=
f an RSU<br>
=C2=A0 =C2=A0through the multihop data forwarding of intermediate vehicles =
(or<br>
=C2=A0 =C2=A0pedestrians&#39; smartphones).=C2=A0 Thus, IPv6 needs to be ex=
tended for<br>
=C2=A0 =C2=A0multihop V2X (or V2I2X) communications.<br>
<br>
&gt;&gt;&gt; Please be more specific on what the missing functions are and =
whether they<br>
are missing from the stack development standpoint or if there=E2=80=99s wor=
k needed<br>
from the IETF. 1)=C2=A0 =C2=A0 =C2=A0 If something is really missing in our=
 specs, the text to<br>
prove from the use case above is missing 2)=C2=A0 =C2=A0 =C2=A0 how OMNI se=
rves the use case<br>
could be elaborated in an applicability statement of OMNI for V2xyz, but it=
 is<br>
a bit blunt to present it as panacea when the problems to be solved are not=
<br>
listed. 3)=C2=A0 =C2=A0 =C2=A0 If you look at it, OMNI seems like a softwar=
e mobile router<br>
within a bump in the stack. Can that become too big?<br>
<br>
&gt;&gt;&gt; my view is that the text above and the similar occasions shoul=
d be replaced<br>
by something like :<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented to provide the fo=
llowing<br>
=C2=A0 =C2=A0functions: 1) =E2=80=A6<br>
<br>
&gt;&gt;&gt; and / or something like:<br>
<br>
=C2=A0 =C2=A0In addition to the IPv6 node requirements [RFC 8504], the IPv6=
 protocol<br>
=C2=A0 =C2=A0stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=
=A6<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To support applications of these V2X use cases, the functions =
of IPv6<br>
=C2=A0 =C2=A0such as VND, VMM, and VSP are prerequisites for IPv6-based pac=
ket<br>
=C2=A0 =C2=A0exchange, transport-layer session continuity, and secure, safe=
<br>
=C2=A0 =C2=A0communication between a vehicle and a pedestrian either direct=
ly or<br>
=C2=A0 =C2=A0indirectly via an IP-RSU.<br>
<br>
&gt;&gt;&gt; =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=
=9D does not parse. There=E2=80=99s<br>
no IPv6 reference that provides those functions. If the intention is to say=
<br>
that there=E2=80=99s stuff to add to IPv6 to support, like, say,=C2=A0 VND,=
 then this<br>
document fails to define how an IPv6 VND should behave, though it=E2=80=99s=
 precisely<br>
what I=E2=80=99d expect from a problem statement.<br>
<br>
&lt;snip&gt;<br>
<br>
4.=C2=A0 Vehicular Networks<br>
<br>
&gt;&gt;&gt; What is the purpose of section 4 as a whole, problem statement=
 or<br>
applicability statement of the listed protocols? In the former case what=E2=
=80=99s the<br>
problem? In the latter case it is incomplete and needs to be exported to an=
<br>
applicability statement doc with all the possible technologies evaluated.<b=
r>
<br>
=C2=A0 =C2=A0This section describes an example vehicular network architectu=
re<br>
=C2=A0 =C2=A0supporting V2V, V2I, and V2X communications in vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt; I read this as presenting a context to explain what the proble=
ms are<br>
instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe usin=
g the term<br>
=E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=99s =
comment.<br>
<br>
&lt;snip&gt;<br>
<br>
4.1.=C2=A0 Vehicular Network Architecture<br>
<br>
=C2=A0 =C2=A0Figure 1 shows an example vehicular network architecture for V=
2I and<br>
=C2=A0 =C2=A0V2V in a road network [OMNI].<br>
<br>
a.=C2=A0 =C2=A0 =C2=A0 Is using OMNI a decision that the WG made for the fu=
ture work ? what<br>
does it do and what does it not do? b.=C2=A0 =C2=A0 =C2=A0 Is there work le=
ft to be done? Who<br>
will do that work? Or is it the expectation that OMNI has it all defined<br=
>
already?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An existing network architecture (e.g., an IP-based aeronautic=
al<br>
=C2=A0 =C2=A0network architecture [OMNI][UAM-ITS], a network architecture o=
f<br>
=C2=A0 =C2=A0PMIPv6 [RFC5213], and a low-power and lossy network architectu=
re<br>
=C2=A0 =C2=A0[RFC6550]) can be extended to a vehicular network architecture=
 for<br>
=C2=A0 =C2=A0multihop V2V, V2I, and V2X, as shown in Figure 1.=C2=A0 In a h=
ighway<br>
=C2=A0 =C2=A0scenario, a vehicle may not access an RSU directly because of =
the<br>
=C2=A0 =C2=A0distance of the DSRC coverage (up to 1 km).=C2=A0 For example,=
 the OMNI<br>
=C2=A0 =C2=A0interface and/or RPL (IPv6 Routing Protocol for Low-Power and =
Lossy<br>
=C2=A0 =C2=A0Networks) [RFC6550] can be extended to support a multihop V2I =
since a<br>
=C2=A0 =C2=A0vehicle can take advantage of other vehicles as relay nodes to=
 reach<br>
=C2=A0 =C2=A0the RSU.=C2=A0 Also, RPL can be extended to support both multi=
hop V2V and<br>
=C2=A0 =C2=A0V2X in the similar way.<br>
<br>
&gt;&gt;&gt; all this could fit well in annex; anyway you need to explain w=
hat you<br>
expect the protocols to do and which extension is needed. In the case of RP=
L at<br>
least you indicate that it would do routing, but not why you cannot use it =
of<br>
the shelf; for OMNI, what you expect is less clear, though there=E2=80=99s =
text<br>
elsewhere about the many radio interfaces that could be used for the purpos=
e,<br>
and the text in the UAM below that is enlightening.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 To support not only the mobil=
ity<br>
=C2=A0 =C2=A0management of the UAM end systems, but also the multihop and<b=
r>
=C2=A0 =C2=A0multilink communications of the UAM interfaces, the UAM end sy=
stems<br>
=C2=A0 =C2=A0can employ an Overlay Multilink Network (OMNI) interface [OMNI=
] as a<br>
=C2=A0 =C2=A0virtual Non-Broadcast Multiple Access (NBMA) connection to a s=
erving<br>
=C2=A0 =C2=A0ground domain infrastructure.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; when connecting to a MANET it needs support for that MANET. The t=
ext<br>
above seems to imply that is solves everything in V2xyz like magic; reminds=
 me<br>
of the IPv6 multicast abstraction that was supposed to solve the broadcast<=
br>
problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 This infrastructure can be configured<br>
=C2=A0 =C2=A0over the underlying data links.=C2=A0 The OMNI interface and i=
ts link<br>
=C2=A0 =C2=A0model provide a means of multilink, multihop and mobility<br>
=C2=A0 =C2=A0coordination to the legacy IPv6 ND messaging [RFC4861] accordi=
ng to<br>
=C2=A0 =C2=A0the NBMA principle.=C2=A0 Thus, the OMNI link model can suppor=
t efficient<br>
=C2=A0 =C2=A0UAM internetworking services without additional mobility messa=
ging,<br>
=C2=A0 =C2=A0and without any modification to the IPv6 ND messaging services=
 or<br>
=C2=A0 =C2=A0link model.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; the text above seems to imply that is solves everything in V2xyz =
like<br>
magic; that would be a stretch, that reminds me of IPv6 multicast that was<=
br>
supposed to solve the broadcast problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Multiple vehicles under the coverage of an RSU share a prefix =
just as<br>
=C2=A0 =C2=A0mobile nodes share a prefix of a Wi-Fi access point in a wirel=
ess<br>
=C2=A0 =C2=A0LAN.=C2=A0 This is a natural characteristic in infrastructure-=
based<br>
=C2=A0 =C2=A0wireless networks.=C2=A0 For example, in Figure 1, two vehicle=
s (i.e.,<br>
=C2=A0 =C2=A0Vehicle2, and Vehicle5) can use Prefix 1 to configure their IP=
v6<br>
=C2=A0 =C2=A0global addresses for V2I communication.=C2=A0 Alternatively, m=
obile nodes<br>
=C2=A0 =C2=A0can employ an OMNI interface and use their own IPv6 Unique Loc=
al<br>
=C2=A0 =C2=A0Addresses (ULAs) [RFC4193] over the wireless network without<b=
r>
=C2=A0 =C2=A0requiring the messaging of IPv6 Stateless Address Autoconfigur=
ation<br>
=C2=A0 (SLAAC) [RFC4862], which uses an on-link prefix provided by the<br>
=C2=A0 =C2=A0(visited) wireless LAN; this technique is known as &quot;Bring=
-Your-Own-<br>
=C2=A0 =C2=A0Addresses&quot;.<br>
<br>
&gt;&gt;&gt;=C2=A0 Is OMNI the only way to &quot;Bring-Your-Own-Addresses=
=E2=80=9D? Else the text could be<br>
more generic, at least use e.g., like the ref to AERO later. &gt;&gt;&gt; W=
hat are the<br>
implications / limitations of doing that =E2=80=93 like they can do line of=
 sight V2V<br>
but not reach the internet, or the need of=C2=A0 a local MANET / RPL that w=
ill<br>
accept to route those addresses, or the security / address ownership valida=
tion<br>
issues ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0A single subnet prefix announced by an RSU can span multiple v=
ehicles<br>
=C2=A0 =C2=A0in VANET.=C2=A0 For example, in Figure 1, for Prefix 1, three =
vehicles<br>
=C2=A0 =C2=A0(i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a conne=
cted<br>
=C2=A0 =C2=A0VANET.=C2=A0 Also, for Prefix 2, two vehicles (i.e., Vehicle3 =
and<br>
=C2=A0 =C2=A0Vehicle6) can construct another connected VANET, and for Prefi=
x 3,<br>
=C2=A0 =C2=A0two vehicles (i.e., Vehicle4 and Vehicle7) can construct anoth=
er<br>
=C2=A0 =C2=A0connected VANET.=C2=A0 Alternatively, each vehicle could emplo=
y an OMNI<br>
=C2=A0 =C2=A0interface with their own ULAs such that no topologically-orien=
ted<br>
=C2=A0 =C2=A0subnet prefixes need be announced by the RSU.<br>
<br>
&gt;&gt;&gt;=C2=A0 same as above. This seems to restate the same thing, der=
ive an address<br>
from a topologically correct prefix or use your own with limitations to be<=
br>
described.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]<b=
r>
=C2=A0 =C2=A0specifies several details, including Maximum Transmission Unit=
 (MTU),<br>
=C2=A0 =C2=A0frame format, link-local address, address mapping for unicast =
and<br>
=C2=A0 =C2=A0multicast, stateless autoconfiguration, and subnet structure.=
=C2=A0 An<br>
=C2=A0 =C2=A0Ethernet Adaptation (EA) layer is in charge of transforming so=
me<br>
=C2=A0 =C2=A0parameters between the IEEE 802.11 MAC layer and the IPv6 netw=
ork<br>
=C2=A0 =C2=A0layer, which is located between the IEEE 802.11-OCB&#39;s logi=
cal link<br>
=C2=A0 =C2=A0control layer and the IPv6 network layer.=C2=A0 This IPv6 over=
 802.11-OCB<br>
=C2=A0 =C2=A0can be used for both V2V and V2I in IPv6-based vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt;=C2=A0 solution space.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An IPv6 mobility solution is needed for the guarantee of<br>
=C2=A0 =C2=A0communication continuity in vehicular networks so that a vehic=
le&#39;s<br>
=C2=A0 =C2=A0TCP session can be continued, or UDP packets can be delivered =
to a<br>
=C2=A0 =C2=A0vehicle as a destination without loss while it moves from an I=
P-RSU&#39;s<br>
=C2=A0 =C2=A0wireless coverage to another IP-RSU&#39;s wireless coverage.=
=C2=A0 In<br>
=C2=A0 =C2=A0Figure 1, assuming that Vehicle2 has a TCP session (or a UDP s=
ession)<br>
=C2=A0 =C2=A0with a corresponding node in the vehicular cloud, Vehicle2 can=
 move<br>
=C2=A0 =C2=A0from IP-RSU1&#39;s wireless coverage to IP-RSU2&#39;s wireless=
 coverage.=C2=A0 In<br>
=C2=A0 =C2=A0this case, a handover for Vehicle2 needs to be performed by ei=
ther a<br>
=C2=A0 =C2=A0host-based mobility management scheme (e.g., MIPv6 [RFC6275]) =
or a<br>
=C2=A0 =C2=A0network-based mobility management scheme (e.g., PMIPv6 [RFC521=
3] and<br>
=C2=A0 =C2=A0AERO [RFC6706BIS]).<br>
<br>
=C2=A0 =C2=A0In the host-based mobility scheme (e.g., MIPv6), an IP-RSU pla=
ys a<br>
=C2=A0 =C2=A0role of a home agent.=C2=A0 On the other hand, in the network-=
based<br>
=C2=A0 =C2=A0mobility scheme (e.g., PMIPv6, an MA plays a role of a mobilit=
y<br>
=C2=A0 =C2=A0management controller such as a Local Mobility Anchor (LMA) in=
<br>
=C2=A0 =C2=A0PMIPv6, which also serves vehicles as a home agent, and an IP-=
RSU<br>
=C2=A0 =C2=A0plays a role of an access router such as a Mobile Access Gatew=
ay<br>
=C2=A0 =C2=A0(MAG) in PMIPv6 [RFC5213].=C2=A0 The host-based mobility schem=
e needs<br>
=C2=A0 =C2=A0client functionality in IPv6 stack of a vehicle as a mobile no=
de for<br>
=C2=A0 =C2=A0mobility signaling message exchange between the vehicle and ho=
me<br>
=C2=A0 =C2=A0agent.=C2=A0 On the other hand, the network-based mobility sch=
eme does not<br>
=C2=A0 =C2=A0need such a client functionality for a vehicle because the net=
work<br>
=C2=A0 =C2=A0infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility =
agent<br>
=C2=A0 =C2=A0handles the mobility signaling message exchange with the home =
agent<br>
=C2=A0 =C2=A0(e.g., LMA in PMIPv6) for the sake of the vehicle.<br>
<br>
=C2=A0 =C2=A0There are a scalability issue and a route optimization issue i=
n the<br>
=C2=A0 =C2=A0network-based mobility scheme (e.g., PMIPv6) when an MA covers=
 a<br>
=C2=A0 =C2=A0large vehicular network governing many IP-RSUs.=C2=A0 In this =
case, a<br>
=C2=A0 =C2=A0distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate=
 the<br>
=C2=A0 =C2=A0scalability issue by distributing multiple MAs in the vehicula=
r<br>
=C2=A0 =C2=A0network such that they are positioned closer to vehicles for r=
oute<br>
=C2=A0 =C2=A0optimization and bottleneck mitigation in a central MA in the<=
br>
=C2=A0 =C2=A0network-based mobility scheme.=C2=A0 All these mobility approa=
ches (i.e.,<br>
=C2=A0 =C2=A0a host-based mobility scheme, network-based mobility scheme, a=
nd<br>
=C2=A0 =C2=A0distributed mobility scheme) and a hybrid approach of a combin=
ation<br>
=C2=A0 =C2=A0of them need to provide an efficient mobility service to vehic=
les<br>
=C2=A0 =C2=A0moving fast and moving along with the relatively predictable<b=
r>
=C2=A0 =C2=A0trajectories along the roadways.<br>
<br>
=C2=A0 =C2=A0In vehicular networks, the control plane can be separated from=
 the<br>
=C2=A0 =C2=A0data plane for efficient mobility management and data forwardi=
ng by<br>
=C2=A0 =C2=A0using the concept of Software-Defined Networking (SDN)<br>
=C2=A0 =C2=A0[RFC7149][DMM-FPC].=C2=A0 Note that Forwarding Policy Configur=
ation (FPC)<br>
=C2=A0 =C2=A0in [DMM-FPC], which is a flexible mobility management system, =
can<br>
=C2=A0 =C2=A0manage the separation of data-plane and control-plane in DMM.=
=C2=A0 In<br>
=C2=A0 =C2=A0SDN, the control plane and data plane are separated for the ef=
ficient<br>
=C2=A0 =C2=A0management of forwarding elements (e.g., switches and routers)=
 where<br>
=C2=A0 =C2=A0an SDN controller configures the forwarding elements in a cent=
ralized<br>
=C2=A0 =C2=A0way and they perform packet forwarding according to their forw=
arding<br>
=C2=A0 =C2=A0tables that are configured by the SDN controller.=C2=A0 An MA =
as an SDN<br>
=C2=A0 =C2=A0controller needs to efficiently configure and monitor its IP-R=
SUs and<br>
=C2=A0 =C2=A0vehicles for mobility management, location management, and sec=
urity<br>
=C2=A0 =C2=A0services.<br>
<br>
=C2=A0 =C2=A0The mobility information of a GPS receiver mounted in its vehi=
cle<br>
=C2=A0 =C2=A0(e.g., position, speed, and direction) can be used to accommod=
ate<br>
=C2=A0 =C2=A0mobility-aware proactive handover schemes, which can perform t=
he<br>
=C2=A0 =C2=A0handover of a vehicle according to its mobility and the wirele=
ss<br>
=C2=A0 =C2=A0signal strength of a vehicle and an IP-RSU in a proactive way.=
<br>
<br>
=C2=A0 =C2=A0Vehicles can use the TCC as their Home Network having a home a=
gent<br>
=C2=A0 =C2=A0for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5=
213],<br>
=C2=A0 =C2=A0so the TCC (or an MA inside the TCC) maintains the mobility<br=
>
=C2=A0 =C2=A0information of vehicles for location management.=C2=A0 IP tunn=
eling over<br>
=C2=A0 =C2=A0the wireless link should be avoided for performance efficiency=
.<br>
=C2=A0 =C2=A0Also, in vehicular networks, asymmetric links sometimes exist =
and<br>
=C2=A0 =C2=A0must be considered for wireless communications such as V2V and=
 V2I.<br>
<br>
&gt;&gt;&gt;=C2=A0 This is all very informative text but does not state a p=
roblem. Is there a<br>
problem is left to be solved or are we assessing the applicability of<br>
protocols? Could it for instance, forward point to issues discussed in sect=
ion<br>
5?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, as internal networks, a vehicle&#39;s mo=
ving<br>
=C2=A0 =C2=A0network and an EN&#39;s fixed network are self-contained netwo=
rks having<br>
=C2=A0 =C2=A0multiple subnets and having an edge router (e.g., IP-OBU and I=
P-RSU)<br>
=C2=A0 =C2=A0for the communication with another vehicle or another EN.=C2=
=A0 The<br>
=C2=A0 =C2=A0internetworking between two internal networks via V2I communic=
ation<br>
=C2=A0 =C2=A0requires the exchange of the network parameters and the networ=
k<br>
=C2=A0 =C2=A0prefixes of the internal networks.=C2=A0 For the efficiency, t=
he network<br>
=C2=A0 =C2=A0prefixes of the internal networks (as a moving network) in a v=
ehicle<br>
=C2=A0 =C2=A0need to be delegated and configured automatically.=C2=A0 Note =
that a<br>
=C2=A0 =C2=A0moving network&#39;s network prefix can be called a Mobile Net=
work Prefix<br>
=C2=A0 =C2=A0(MNP) [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. MNP is originally =
defined here<br>
<a href=3D"https://datatracker.ietf.org/doc/html/rfc3963#section-2" target=
=3D"_blank">https://datatracker.ietf.org/doc/html/rfc3963#section-2</a> and=
 that=E2=80=99s a reference<br>
you can use normatively.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, the addresses used for IPv6 transmission=
s over<br>
=C2=A0 =C2=A0the wireless link interfaces for IP-OBU and IP-RSU can be eith=
er<br>
=C2=A0 =C2=A0global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets ca=
n be<br>
=C2=A0 =C2=A0routed within vehicular networks [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. There needs to=C2=
=A0 be a routing protocol<br>
like a MANET that will accept to carry the<br>
=C2=A0MNPs, and that must be implemented by the infra and both cars. The OM=
NI spec<br>
=C2=A0is clear on that. This is why at first glance I see OMNI as a full mo=
bile<br>
=C2=A0router in a bump in the stack. Now what is the problem behind this? N=
o such<br>
=C2=A0protocol at IETF? Too many to choose from? No deployment?<br>
&lt;snip&gt;<br>
<br>
When global IPv6 addresses<br>
=C2=A0 =C2=A0are used, wireless interface configuration and control overhea=
d for<br>
=C2=A0 =C2=A0Duplicate Address Detection (DAD) [RFC4862] and Multicast List=
ener<br>
=C2=A0 =C2=A0Discovery (MLD) [RFC2710][RFC3810] should be minimized to supp=
ort V2I<br>
=C2=A0 =C2=A0and V2X communications for vehicles moving fast along roadways=
; when<br>
=C2=A0 =C2=A0ULAs and the OMNI interface are used, no DAD nor MLD messaging=
 is<br>
=C2=A0 =C2=A0needed.<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it t=
he no dad needed a property<br>
of injecting a BYOA in the fabric for an GUA MIP Home Address which is know=
n to<br>
be unique at home? &gt;&gt;&gt; OTOH, autoconf=E2=80=99ing a random ULA =E2=
=80=9CFD=E2=80=A6=E2=80=9Dprefix has lesser<br>
DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classical =
subnet. So<br>
who says DAD isn=E2=80=99t required for OMNI ULA? &gt;&gt;&gt; note that IM=
HO DAD on wireless is<br>
a lot more harm than good, and I agree that with a good pseudo random gener=
ator<br>
the ULA has no chance to collision in the real world, as OMNI claims. It=E2=
=80=99s just<br>
that your argument here plays the other way, because there are less random =
bits<br>
(56)=C2=A0 in the ULA prefix than in the IID (62), and if one starts using =
more<br>
prefix bits to be non-random, there will be a time when DAD on prefix is ne=
eded.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Let us consider the upload/download time of a vehicle when it =
passes<br>
=C2=A0 =C2=A0through the wireless communication coverage of an IP-RSU.=C2=
=A0 For a<br>
=C2=A0 =C2=A0given typical setting where 1km is the maximum DSRC communicat=
ion<br>
=C2=A0 =C2=A0range [DSRC] and 100km/h is the speed limit in highway, the dw=
elling<br>
=C2=A0 =C2=A0time can be calculated to be 72 seconds by dividing the diamet=
er of<br>
=C2=A0 =C2=A0the 2km (i.e., two times of DSRC communication range where an =
IP-RSU<br>
=C2=A0 =C2=A0is located in the center of the circle of wireless communicati=
on) by<br>
=C2=A0 =C2=A0the speed limit of 100km/h (i.e., about 28m/s).=C2=A0 For the =
72 seconds,<br>
=C2=A0 =C2=A0a vehicle passing through the coverage of an IP-RSU can upload=
 and<br>
=C2=A0 =C2=A0download data packets to/from the IP-RSU.<br>
<br>
&lt;snip&gt;<br>
<br>
4.3.=C2=A0 V2V-based Internetworking<br>
<br>
&gt;&gt;&gt; In this section it looks like the cars are in a stable line of=
 sight<br>
relationship. Which is probably fine for a platoon, but when you drive alon=
g<br>
with friends in different cars, you realize that the line of sight assumpti=
on<br>
does not stand over time. Soon enough, other cars meddle in, and possibly o=
ne<br>
of the cars drives faster and too far ahead so you need the infra to relay,=
<br>
possibly over multiple infra hops.<br>
<br>
&gt;&gt;&gt; so in this section, I=E2=80=99d expect to see a Vehicle commun=
icating with another<br>
one and using either line of sight or V2V relaying but also using relay via=
 V2I<br>
(multihop I2I not just hub and spoke V2I2V ), alternatively to together for=
<br>
redundancy. Is that part of the problem?<br>
<br>
&gt;&gt;&gt; reading deeper section 5 I found excellent text on routing via=
 V and via I.<br>
This tells that section 4 does not play a good role at justifying section 5=
.<br>
Maybe keep section 4 for another doc?<br>
<br>
&gt;&gt;&gt; What kind or reliability is required in a V2V use case? Do you=
 think ND can<br>
handle it? Or MANET? What would be the assumption on L2 (roaming time, unic=
ast<br>
vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3 <br=
>
redundancy?<br>
<br>
&lt;snip&gt;<br>
<br>
5.=C2=A0 Problem Statement<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0In order to specify protocols using the architecture mentioned=
 in<br>
=C2=A0 =C2=A0Section 4.1, IPv6 core protocols have to be adapted to overcom=
e<br>
=C2=A0 =C2=A0certain challenging aspects of vehicular networking.=C2=A0 Sin=
ce the<br>
=C2=A0 =C2=A0vehicles are likely to be moving at great speed, protocol exch=
anges<br>
=C2=A0 =C2=A0need to be completed in a time relatively short compared to th=
e<br>
=C2=A0 =C2=A0lifetime of a link between a vehicle and an IP-RSU, or between=
 two<br>
=C2=A0 =C2=A0vehicles.<br>
<br>
&gt;&gt;&gt; Any order of magnitude?<br>
&gt;&gt;&gt; Can you indicate whether this already rules out certain proced=
ures, e.g.<br>
DAD ?<br>
<br>
=C2=A0 =C2=A0The lifetime of a session varies depending on the session&#39;=
s type such<br>
=C2=A0 =C2=A0as a web surfing, voice call over IP, and DNS query.=C2=A0 Reg=
ardless of a<br>
=C2=A0 =C2=A0session&#39;s type, to guide all the IPv6 packets to their des=
tination<br>
=C2=A0 =C2=A0host, IP mobility should be supported for the session.<br>
<br>
&gt;&gt;&gt; this seems to be for unicast when you know who to talk to. Is =
there a need<br>
some multicast groups like anybody around interested in topic blah like I c=
ould<br>
be multicasting the speed of vehicles coming the other way that I crossed<b=
r>
recently, for use of vehicles that I=E2=80=99m crossing now, so they can se=
e a slowdown<br>
on advance<br>
<br>
=C2=A0 =C2=A0Thus, the time constraint of a wireless link has a major impac=
t on<br>
=C2=A0 =C2=A0IPv6 Neighbor Discovery (ND).=C2=A0 Mobility Management (MM) i=
s also<br>
=C2=A0 =C2=A0vulnerable to disconnections that occur before the completion =
of<br>
=C2=A0 =C2=A0identity verification and tunnel management.=C2=A0 This is esp=
ecially true<br>
=C2=A0 =C2=A0given the unreliable nature of wireless communication.=C2=A0 T=
his section<br>
=C2=A0 =C2=A0presents key topics such as neighbor discovery and mobility<br=
>
=C2=A0 =C2=A0management.<br>
<br>
&gt;&gt;&gt; Only ND? What about the MANET?<br>
&gt;&gt;&gt; how fast should ND be to be suitable?<br>
&gt;&gt;&gt; is there also a bandwidth check? You can make things much fast=
er if you<br>
dedicate a lot of spectrum to it. But that can also be a waste.<br>
<br>
5.1.=C2=A0 Neighbor Discovery<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The requirements for IPv6 ND for vehicular networks are effici=
ent DAD<br>
=C2=A0 =C2=A0and NUD operations.<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 This merging and partitioning should be considered for=
 the<br>
=C2=A0 =C2=A0IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAA=
C)<br>
=C2=A0 =C2=A0[RFC4862].<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Also, the partitioning of a VANET may make vehicles with the s=
ame<br>
=C2=A0 =C2=A0prefix be physically unreachable.=C2=A0 Also, SLAAC needs to p=
revent IPv6<br>
=C2=A0 =C2=A0address duplication due to the merging of VANETs.=C2=A0 Accord=
ing to the<br>
=C2=A0 =C2=A0merging and partitioning, a destination vehicle (as an IPv6 ho=
st)<br>
=C2=A0 =C2=A0needs to be distinguished as either an on-link host or an off-=
link<br>
=C2=A0 =C2=A0host even though the source vehicle uses the same prefix as th=
e<br>
=C2=A0 =C2=A0destination vehicle.<br>
<br>
&gt;&gt;&gt; should reference to draft-nordmark-intarea-ippl<br>
<br>
=C2=A0 =C2=A0To efficiently prevent IPv6 address duplication due to the VAN=
ET<br>
=C2=A0 =C2=A0partitioning and merging from happening in vehicular networks,=
 the<br>
=C2=A0 =C2=A0vehicular networks need to support a vehicular-network-wide DA=
D by<br>
=C2=A0 =C2=A0defining a scope that is compatible with the legacy DAD.=C2=A0=
 In this<br>
=C2=A0 =C2=A0case, two vehicles can communicate with each other when there =
exists<br>
=C2=A0 =C2=A0a communication path over VANET or a combination of VANETs and=
 IP-<br>
=C2=A0 =C2=A0RSUs, as shown in Figure 1.=C2=A0 By using the vehicular-netwo=
rk-wide DAD,<br>
=C2=A0 =C2=A0vehicles can assure that their IPv6 addresses are unique in th=
e<br>
=C2=A0 =C2=A0vehicular network whenever they are connected to the vehicular=
<br>
=C2=A0 =C2=A0infrastructure or become disconnected from it in the form of V=
ANET.<br>
<br>
&gt;&gt;&gt; Excellent<br>
<br>
=C2=A0 =C2=A0ND time-related parameters such as router lifetime and Neighbo=
r<br>
=C2=A0 =C2=A0Advertisement (NA) interval need to be adjusted for vehicle sp=
eed and<br>
=C2=A0 =C2=A0vehicle density.=C2=A0 For example, the NA interval needs to b=
e<br>
=C2=A0 =C2=A0dynamically adjusted according to a vehicle&#39;s speed so tha=
t the<br>
=C2=A0 =C2=A0vehicle can maintain its neighboring vehicles in a stable way,=
<br>
=C2=A0 =C2=A0considering the collision probability with the NA messages sen=
t by<br>
=C2=A0 =C2=A0other vehicles.<br>
<br>
&gt;&gt;&gt; Is that a problem or just an operational setting that needs to=
 be found?<br>
&gt;&gt;&gt; Do we need to reconsider the concepts of those timers?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, IPv6 ND should have =
minimum<br>
=C2=A0 =C2=A0changes for the interoperability with the legacy IPv6 ND used =
in the<br>
=C2=A0 =C2=A0Internet, including the DAD and NUD operations.<br>
<br>
&gt;&gt;&gt; I do not find the logical link with the text before, why is th=
is a =E2=80=9Cthus=E2=80=9D?<br>
&gt;&gt;&gt; why should the ND inside the VANET be constrained to be intero=
perable? This<br>
may place constraints on the solution.<br>
<br>
5.1.1.=C2=A0 Link Model<br>
<br>
=C2=A0 =C2=A0A prefix model for a vehicular network needs to facilitate the=
<br>
<br>
&gt;&gt;&gt; Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=
=80=9Cprefix model=E2=80=9D.<br>
&gt;&gt;&gt; it would make this piece and the next should refer to<br>
draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both li=
nk<br>
and subnet issues. The general ideas are the same, but the gory details her=
e<br>
are slightly incorrect, like this notion of prefix model than comes out of =
the<br>
blue. The model is really the subnet model for the subnet associated to P2M=
P.<br>
<br>
=C2=A0 =C2=A0communication between two vehicles with the same prefix regard=
less of<br>
=C2=A0 =C2=A0the vehicular network topology as long as there exist bidirect=
ional<br>
=C2=A0 =C2=A0E2E paths between them in the vehicular network including VANE=
Ts and<br>
=C2=A0 =C2=A0IP-RSUs.=C2=A0 This prefix model allows vehicles with the same=
 prefix to<br>
=C2=A0 =C2=A0communicate with each other via a combination of multihop V2V =
and<br>
=C2=A0 =C2=A0multihop V2I with VANETs and IP-RSUs.=C2=A0 Note that the OMNI=
 interface<br>
=C2=A0 =C2=A0supports an NBMA link model where multihop V2V and V2I communi=
cations<br>
=C2=A0 =C2=A0use each mobile node&#39;s ULAs without need for any DAD or ML=
D<br>
=C2=A0 =C2=A0messaging.<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; I kinda agree about the OMNI interface model, nothing against =
that. But you<br>
must see that there needs a lot more than what the OMNI interface to get<br=
>
packets across V and I hops to the destination. Like routing ala MANET,<br>
redundancy handling ala DetNet because it will be very lossy, path manageme=
nt<br>
ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND so i=
t does not<br>
solve the ND problems above.<br>
<br>
=C2=A0 =C2=A0IPv6 protocols work under certain assumptions that do not nece=
ssarily<br>
=C2=A0 =C2=A0hold for vehicular wireless access link types other than OMNI/=
NBMA<br>
=C2=A0 =C2=A0[VIP-WAVE][RFC5889]; the rest of this section discusses implic=
ations<br>
=C2=A0 =C2=A0for those link types that do not apply when the OMNI/NBMA link=
 model<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; The keyword here is P2MP / NBMA, and OMNI is one interface tha=
t accepts<br>
that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already P2M=
P / NBMA,<br>
using routing to complete the partial mesh in P2MP. The text seems to imply=
<br>
that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI is=
 loaded with<br>
other stuff than a plain P2MP capable interface. And ND over P2MP is not do=
ne<br>
by OMNI, OMNI only makes classical ND worse and only works in a full mesh. =
OTOH<br>
RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work very =
well<br>
within an OMNI interface and solve those problems. &gt;&gt;&gt; My point is=
 that you<br>
need to tell the full story or refrain from entering solution space in this=
 doc<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0There is a relationship between a link and a prefix, besides t=
he<br>
=C2=A0 =C2=A0different scopes that are expected from the link-local and glo=
bal<br>
=C2=A0 =C2=A0types of IPv6 addresses.=C2=A0 In an IPv6 link, it is assumed =
that all<br>
=C2=A0 =C2=A0interfaces which are configured with the same subnet prefix an=
d with<br>
=C2=A0 =C2=A0on-link bit set can communicate with each other on an IPv6 lin=
k.<br>
<br>
&gt;&gt;&gt; not assumed; that=E2=80=99s what the onlink but set tells. The=
 conclusion should be<br>
that the VANET cannot set the O bit.<br>
<br>
=C2=A0 =C2=A0However, the vehicular link model needs to define the relation=
ship<br>
=C2=A0 =C2=A0between a link and a prefix, considering the dynamics of wirel=
ess<br>
=C2=A0 =C2=A0links and the characteristics of VANET.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0From the previous observation, a vehicular link model should c=
onsider<br>
=C2=A0 =C2=A0the frequent partitioning and merging of VANETs due to vehicle=
<br>
=C2=A0 =C2=A0mobility.=C2=A0 Therefore, the vehicular link model needs to u=
se an on-<br>
=C2=A0 =C2=A0link prefix and off-link prefix according to the network topol=
ogy of<br>
=C2=A0 =C2=A0vehicles such as a one-hop reachable network and a multihop re=
achable<br>
<br>
&gt;&gt;&gt; No, the once a node saw a O bit set that sticks even if it see=
s other<br>
advertisements of the PIO with the O bit not set. &gt;&gt;&gt; This is a gl=
obal and<br>
intrinsic property of the prefix (and an attack vector that could be mentio=
ned<br>
in the sec section). &gt;&gt;&gt; the VANET prefix must never come with the=
 O bit set.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0network (or partitioned networks).=C2=A0 If the vehicles with =
the same<br>
=C2=A0 =C2=A0prefix are reachable from each other in one hop, the prefix sh=
ould be<br>
=C2=A0 =C2=A0on-link.<br>
<br>
&gt;&gt;&gt;&gt; No, see above; but the router may redirect though it is re=
ally risky<br>
unless this is a stable situation like a parking place.<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, the vehicular link m=
odel<br>
=C2=A0 =C2=A0should have minimum changes for interoperability with standard=
 IPv6<br>
=C2=A0 =C2=A0links in an efficient fashion to support IPv6 DAD, MLD and NUD=
<br>
=C2=A0 =C2=A0operations.=C2=A0 When the OMNI NBMA link model is used, there=
 are no link<br>
=C2=A0 =C2=A0model changes nor DAD/MLD messaging required.<br>
<br>
&gt;&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt;&gt; You need a good P2MP subnet model with routing support whe=
n the mesh is<br>
partial. My company alone has been shipping million of nodes that build sub=
nets<br>
of thousands, and that was done using IETF standards.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For vehicular networks with high mobility and density, the DAD=
 needs<br>
=C2=A0 =C2=A0to be performed efficiently with minimum overhead so that the<=
br>
=C2=A0 =C2=A0vehicles can exchange a driving safety message (e.g., collisio=
n<br>
=C2=A0 =C2=A0avoidance and accident notification) with each other with a sh=
ort<br>
=C2=A0 =C2=A0interval (e.g., 0.5 second) by a technical report from NHTSA<b=
r>
=C2=A0 =C2=A0(National Highway Traffic Safety Administration) [NHTSA-ACAS-R=
eport].<br>
=C2=A0 =C2=A0Such a driving safety message may include a vehicle&#39;s mobi=
lity<br>
=C2=A0 =C2=A0information (i.e., position, speed, direction, and acceleratio=
n/<br>
=C2=A0 =C2=A0deceleration).=C2=A0 The exchange interval of this message is =
0.5 second,<br>
=C2=A0 =C2=A0which is required to allow a driver to avoid a rear-end crash =
from<br>
=C2=A0 =C2=A0another vehicle.<br>
<br>
&gt;&gt;&gt; IPv6 over broadcast MAC (used to be called internet 0, 10+ yea=
rs ago)<br>
solves that MAC issue since there is no MAC.<br>
<br>
5.1.3.=C2=A0 Routing<br>
<br>
=C2=A0 =C2=A0For multihop V2V communications in either a VANET or VANETs vi=
a IP-<br>
=C2=A0 =C2=A0RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing proto=
col may<br>
=C2=A0 =C2=A0be required to support both unicast and multicast in the links=
 of the<br>
=C2=A0 =C2=A0subnet with the same IPv6 prefix.=C2=A0 However, it will be co=
stly to run<br>
=C2=A0 =C2=A0both vehicular ND and a vehicular ad hoc routing protocol in t=
erms of<br>
=C2=A0 =C2=A0control traffic overhead [ID-Multicast-Problems].<br>
<br>
&gt;&gt;&gt; we do that with IETF standards on battery operated devices alr=
eady. Using<br>
RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve see=
n 30 hops in<br>
meshes of thousands in the real world though it=E2=80=99s not the normal op=
erational<br>
model, but can happen to maintain connectivity during the reboot of a root)=
 and<br>
does not use broadcast. RPL was initially designed as a V2V2V protocol but<=
br>
found its market on the IoT. I=E2=80=99m sure the protocol would gladly com=
e back to<br>
its roots.<br>
<br>
=C2=A0 =C2=A0A routing protocol for a VANET may cause redundant wireless fr=
ames in<br>
=C2=A0 =C2=A0the air to check the neighborhood of each vehicle and compute =
the<br>
=C2=A0 =C2=A0routing information in a VANET with a dynamic network topology=
<br>
=C2=A0 =C2=A0because the IPv6 ND is used to check the neighborhood of each<=
br>
=C2=A0 =C2=A0vehicle.=C2=A0 Thus, the vehicular routing needs to take advan=
tage of the<br>
=C2=A0 =C2=A0IPv6 ND to minimize its control overhead.<br>
<br>
&gt;&gt;&gt; A clean description of the interaction of RPL and RFC 8505 in =
our IoT<br>
networks. Note that the speed of the PHY in VANET balanced the instability =
of<br>
the topology, and RPL still applies. Note also that RPL uses DV with a rout=
ing<br>
stretch in order to minimize the topology awareness that=E2=80=99s needed i=
n each node,<br>
which results in minimal signaling.<br>
<br>
5.2.=C2=A0 Mobility Management<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For a mobility management scheme in a shared link, where the w=
ireless<br>
=C2=A0 =C2=A0subnets of multiple IP-RSUs share the same prefix, an efficien=
t<br>
=C2=A0 =C2=A0vehicular-network-wide DAD is required.=C2=A0 If DHCPv6 is use=
d to assign<br>
=C2=A0 =C2=A0a unique IPv6 address to each vehicle in this shared link,<br>
<br>
&gt;&gt;&gt; I would not use the term link, or shared. Maybe shared link -&=
gt; domain?<br>
&lt;snip&gt;<br>
<br>
the DAD is<br>
=C2=A0 =C2=A0not required.=C2=A0 On the other hand, for a mobility manageme=
nt scheme<br>
=C2=A0 =C2=A0with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] a=
nd OMNI<br>
=C2=A0 =C2=A0[OMNI]), DAD is not required because the IPv6 address of a veh=
icle&#39;s<br>
=C2=A0 =C2=A0external wireless interface is guaranteed to be unique.<br>
<br>
&gt;&gt;&gt; again overselling OMNI<br>
&gt;&gt;&gt; As I said earlier, this is wring there are (64*) more chances =
of a<br>
collision in OMNI prefixes than in IPv6 IIDs. &gt;&gt;&gt; OMNI prefixes ca=
n collision,<br>
home addresses that are unique on a home network cannot. &gt;&gt;&gt; Now i=
f both the<br>
OMNI prefix and the IID are good randoms, then obviously, the chances of<br=
>
collisions round up to 0. &gt;&gt;&gt; Collision is certainly not my worst =
fear.<br>
<br>
=C2=A0 There is a<br>
=C2=A0 =C2=A0tradeoff between the prefix usage efficiency and DAD overhead.=
=C2=A0 Thus,<br>
=C2=A0 =C2=A0the IPv6 address autoconfiguration for vehicular networks need=
s to<br>
=C2=A0 =C2=A0consider this tradeoff to support efficient mobility managemen=
t.<br>
<br>
&gt;&gt;&gt; This is way too superficial and hides the reality of things.<b=
r>
- Using a VANET Infra prefix allows direct routability to the internet whic=
h<br>
BYOA does not since the BYOA is not topologically correct. Yes, it costs a =
DAD<br>
with classic ND, but it does not with RCF8505 and the draft fails to mentio=
n<br>
that. - A BYOA needs a tunnel home, and the node needs to know who is reach=
able<br>
inside the VANET and what is not to decide to tunnel or not; this is a<br>
difficult problem (vs. control place overhead) that is not discussed here.<=
br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the case of a multihomed network, a vehicle can follow the=
 first-<br>
=C2=A0 =C2=A0hop router selection rule described in [RFC8028].=C2=A0 That i=
s, the<br>
=C2=A0 =C2=A0vehicle should select its default router for each prefix by<br=
>
=C2=A0 =C2=A0preferring the router that advertised the prefix.<br>
<br>
&gt;&gt;&gt; Still router discovery (in and out) must be very fast. Thing o=
f the RA<br>
intervale in MIPv6. Is that sufficient? Too expensive?<br>
<br>
&lt;snip&gt;<br>
<br>
6.=C2=A0 Security Considerations<br>
&gt;&gt;&gt; Any discussion on the security of classical ND and other opera=
tional issues<br>
(rfc6583) ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Security and privacy are paramount in V2I, V2V, and V2X networ=
king.<br>
=C2=A0 =C2=A0Vehicles and infrastructure must be authenticated in order to<=
br>
=C2=A0 =C2=A0participate in vehicular networking.=C2=A0 Also, in-vehicle de=
vices (e.g.,<br>
=C2=A0 =C2=A0ECU) and a driver/passenger&#39;s mobile devices (e.g., smartp=
hone and<br>
=C2=A0 =C2=A0tablet PC) in a vehicle need to communicate with other in-vehi=
cle<br>
=C2=A0 =C2=A0devices and another driver/passenger&#39;s mobile devices in a=
nother<br>
=C2=A0 =C2=A0vehicle, or other servers behind an IP-RSU in a secure way.=C2=
=A0 Even<br>
=C2=A0 =C2=A0though a vehicle is perfectly authenticated and legitimate, it=
 may be<br>
=C2=A0 =C2=A0hacked for running malicious applications to track and collect=
 its<br>
=C2=A0 =C2=A0and other vehicles&#39; information.=C2=A0 In this case, an at=
tack mitigation<br>
=C2=A0 =C2=A0process may be required to reduce the aftermath of malicious<b=
r>
=C2=A0 =C2=A0behaviors.<br>
<br>
&gt;&gt;&gt; The section should mention that both with classical ND and BYO=
A, addresses<br>
can be impersonated, and RFC 8928 protects against that in both cases while=
<br>
maintaining privacy.<br>
<br>
=C2=A0 =C2=A0Even though vehicles can be authenticated with valid certifica=
tes by<br>
=C2=A0 =C2=A0an authentication server in the vehicular cloud, the authentic=
ated<br>
<br>
&gt;&gt;&gt; Is PKI feasible (deploying it in every car?). Is it fast enoug=
h? Is it<br>
really what IPWAVE thinks vehicle should use????? &gt;&gt;&gt; e.g. why wou=
ld one need<br>
to authenticate to a V2I network? &gt;&gt;&gt; from the text earlier in the=
 doc, it<br>
seemed that what you really want is access that is fast to join, capable of=
<br>
offering the reachability you want, anonymous, and innocuous (cars can not =
harm<br>
one another).<br>
<br>
=C2=A0 =C2=A0vehicles may harm other vehicles, so their communication activ=
ities<br>
=C2=A0 =C2=A0need to be logged in either a central way through a logging se=
rver<br>
=C2=A0 =C2=A0(e.g., TCC) in the vehicular cloud or a distributed way (e.g.,=
<br>
=C2=A0 =C2=A0blockchain [Bitcoin]) along with other vehicles or infrastruct=
ure.<br>
=C2=A0 =C2=A0For the non-repudiation of the harmful activities of malicious=
 nodes,<br>
=C2=A0 =C2=A0a blockchain technology can be used [Bitcoin].=C2=A0 Each mess=
age from a<br>
=C2=A0 =C2=A0vehicle can be treated as a transaction and the neighboring ve=
hicles<br>
=C2=A0 =C2=A0can play the role of peers in a consensus method of a blockcha=
in<br>
=C2=A0 =C2=A0[Bitcoin][Vehicular-BlockChain].=C2=A0 For a blockchain&#39;s =
efficient<br>
=C2=A0 =C2=A0consensus in vehicular networks having fast moving vehicles, a=
 new<br>
=C2=A0 =C2=A0consensus algorithm needs to be developed or an existing conse=
nsus<br>
=C2=A0 =C2=A0algorithm needs to be enhanced.<br>
<br>
&gt;&gt;&gt; solution space; better express the=C2=A0 security needs since =
this is a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To identify malicious vehicles among vehicles, an authenticati=
on<br>
=C2=A0 =C2=A0method is required.<br>
<br>
&gt;&gt;&gt; No. As said earlier a vehicle can be infected. You need innocu=
ousness.which<br>
can come from things like isolation, zerotrust, and protocols that are<br>
difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 is<b=
r>
protected by construction, anonymous, and fast.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the setup of a secure channel over IPsec or TLS, the multi=
hop V2I<br>
=C2=A0 =C2=A0communications over DSRC is required in a highway for the<br>
=C2=A0 =C2=A0authentication by involving multiple intermediate vehicles as =
relay<br>
=C2=A0 =C2=A0nodes toward an IP-RSU connected to an authentication server i=
n the<br>
=C2=A0 =C2=A0vehicular cloud.=C2=A0 The V2I communications over 5G V2X (or =
LTE V2X) is<br>
=C2=A0 =C2=A0required to allow a vehicle to communicate directly with a gNo=
deB (or<br>
=C2=A0 =C2=A0eNodeB) connected to an authentication server in the vehicular=
 cloud.<br>
<br>
&gt;&gt;&gt; solution space. Instead, you could mention that setting up sec=
ured channels<br>
between cars that cross one another might not complete in time to establish=
 the<br>
communication channel, and that the innocuousness must come from zerotrust =
in<br>
the transactions between the cars.<br>
=C2=A0 =C2=A0For the IPv6 ND, the DAD is required to ensure the uniqueness =
of the<br>
=C2=A0 =C2=A0IPv6 address of a vehicle&#39;s wireless interface.<br>
<br>
&gt;&gt;&gt; for classical ND (SLAAC) that=E2=80=99s true. That is not with=
 RFC 8505, since the<br>
infra maintains a table of all addresses in use in the prefix and blocks<br=
>
duplicates without the RFC 4862 DAD method. The stateful autoconf address g=
rant<br>
is immediate.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This DAD can be used<br>
=C2=A0 =C2=A0as a flooding attack that uses the DAD-related ND packets<br>
=C2=A0 =C2=A0disseminated over the VANET or vehicular networks.<br>
<br>
&gt;&gt;&gt; also for DOS attacks. You can block a owner from using an addr=
ess. A<br>
reference to rfc6959 is much needed here.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0This possibility<br>
=C2=A0 =C2=A0indicates that the vehicles and IP-RSUs need to filter out sus=
picious<br>
=C2=A0 =C2=A0ND traffic in advance.=C2=A0 Based on the SEND [RFC3971] mecha=
nism, the<br>
=C2=A0 =C2=A0authentication for routers (i.e., IP-RSUs) can be conducted by=
 only<br>
=C2=A0 =C2=A0selecting an IP-RSU that has a certification path toward trust=
ed<br>
=C2=A0 =C2=A0parties.=C2=A0 For authenticating other vehicles, the cryptogr=
aphically<br>
=C2=A0 =C2=A0generated address (CGA) can be used to verify the true owner o=
f a<br>
=C2=A0 =C2=A0received ND message, which requires to use the CGA ND option i=
n the<br>
=C2=A0 =C2=A0ND protocols.=C2=A0 For a general protection of the ND mechani=
sm, the RSA<br>
=C2=A0 =C2=A0Signature ND option can also be used to protect the integrity =
of the<br>
=C2=A0 =C2=A0messages by public key signatures.=C2=A0 For a more advanced<b=
r>
=C2=A0 =C2=A0authentication mechanism, a distributed blockchain-based mecha=
nism<br>
=C2=A0 =C2=A0[Vehicular-BlockChain] can be used.<br>
<br>
&gt;&gt;&gt; solution space. Again, the draft should focus on problems and =
needs. The<br>
problem here is that SEND is complex, and not implemented in the major stac=
k.<br>
It relies on PKI for trusting the router. The V2I need is a zerotrust model=
<br>
where one V, the other local Vs, and the I, can help each other anonymously=
 and<br>
harmlessly. &lt;snip&gt;<br>
<br>
8.=C2=A0 Informative References<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&lt;snip&gt;<br>
<br>
Voila!<br>
<br>
Keep safe;<br>
<br>
Pascal<br>
<br>
<br>
<br>
_______________________________________________<br>
its mailing list<br>
<a href=3D"mailto:its@ietf.org" target=3D"_blank">its@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/its" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/its</a><u></u><u></u></span></font></p>
</blockquote>
</div>
</div>
</div>
</div>

</blockquote></div>

--000000000000192c9a05cb04de32--


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
CC: "int-dir@ietf.org" <int-dir@ietf.org>, Last Call <last-call@ietf.org>, "its@ietf.org" <its@ietf.org>, Russ Housley <housley@vigilsec.com>, "CARLOS JESUS BERNARDOS CANO" <cjbc@it.uc3m.es>, Chris Shen <shenyiwen7@gmail.com>
Thread-Topic: [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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Subject: Re: [Int-dir] [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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From: CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es>
Date: Thu, 2 Sep 2021 20:29:41 +0200
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
Cc: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>, "int-dir@ietf.org" <int-dir@ietf.org>, Last Call <last-call@ietf.org>,  "draft-ietf-ipwave-vehicular-networking.all@ietf.org" <draft-ietf-ipwave-vehicular-networking.all@ietf.org>, its <its@ietf.org>,  Russ Housley <housley@vigilsec.com>,  skku-iotlab-members <skku-iotlab-members@googlegroups.com>, Chris Shen <shenyiwen7@gmail.com>
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Subject: Re: [Int-dir] [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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Thanks a lot Pascal! This is extremely helpful.

Carlos

On Wed, Sep 1, 2021 at 10:09 PM Pascal Thubert (pthubert) <
pthubert@cisco.com> wrote:

> Hello Carlos
>
> Will do ASAP =F0=9F=98=80
>
>
> Regards,
>
> Pascal
>
> Le 1 sept. 2021 =C3=A0 20:49, CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.e=
s> a
> =C3=A9crit :
>
> =EF=BB=BF
> Thanks Paul for the review!
>
> Pascal, would it be possible for you to take a look and comment if you ar=
e
> happy with the new version?
>
> Thanks!
>
> Carlos
>
> On Mon, Aug 30, 2021 at 3:13 PM Mr. Jaehoon Paul Jeong <
> jaehoon.paul@gmail.com> wrote:
>
>> Hi Pascal,
>> Here is the revision (-21) of IPWAVE PS Draft:
>>
>> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networ=
king-21
>>
>> I attach the revision letter to show how I have addressed your comments
>> on the revision.
>>
>> Chris and I have worked for this revision together.
>>
>> If you have further comments, please let me know.
>>
>> Thanks.
>>
>> Best Regards,
>> Paul
>>
>>
>>
>> On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert via Datatracker <
>> noreply@ietf.org> wrote:
>>
>>> Reviewer: Pascal Thubert
>>> Review result: Not Ready
>>>
>>> Dear authors
>>>
>>> In summary:
>>>
>>> I read a number of very good drafts collated in one, from the use cases
>>> that
>>> very complete and ready to publish, to the architecture and protocol
>>> solution
>>> in section 4 that would require more work for completeness.
>>>
>>> There are multiple instances in the use cases where protocols are liste=
d
>>> coming
>>> out of the blue, e.g., the references to OMNI that seem artificially
>>> spread
>>> regardless of the context of the section. OMNI is used throughout, both
>>> as an
>>> open ended toolbox, and as a carpet under which all problems can be
>>> hidden.
>>>
>>> Reading this doc, OMNI shows as an interface to a software mobile
>>> router, with
>>> multiple of the device physical interfaces connected to the mobile
>>> router. This
>>> makes the stack very simple as the complexity moves to the router. But
>>> now you
>>> have to implement the router. Presented as that, the OMNI router
>>> deserves its
>>> name, it=E2=80=99s indeed very rich; it seems to cover all forms of MAN=
ET (many
>>> to
>>> choose from) and NEMO (and all the MIP protocol family across address
>>> families), all the possible radio interfaces on which the ND problems g=
o
>>> away
>>> by magic, and whatever else you want to put in there. Is that the
>>> intention?
>>>
>>> Instead of referring to OMNI for virtually anything, the doc should
>>> refer to
>>> MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),
>>> draft-nordmark-intarea-ippl for split subnets, and
>>> draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet
>>> models. And
>>> then you can say that all those components can be plugged in the OMNI
>>> router,
>>> and you can discuss which MANET and which MIP you want, including using
>>> OMNI=E2=80=99s
>>> built in mobility.
>>>
>>> Note that my objections are not against the OMNI design, it might be th=
e
>>> perfect thing and I am already aware of use cases that could be served
>>> by a
>>> P2MP interface like OMNI in conjunction with RFC8505 on the P2P
>>> subinterfaces
>>> (recycling the high level design we=E2=80=99ve been shipping for IPv4 /=
 frame
>>> relay for
>>> the last 30 years). My objection is of the way the draft uses [OMNI] as
>>> the
>>> magic wand that solves all the problems when what you really do is thro=
w
>>> them
>>> over the fence. I=E2=80=99d rather you focus on problems and use cases,=
 for which
>>> there=E2=80=99s excellent text, and indicate what needs to be done with=
out making
>>> assumption on how the needful things will be solved.
>>>
>>> In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to=
 split,
>>> keep all
>>> that=E2=80=99s use case and problem description and ship it, remove ref=
erences to
>>> protocols envisioned in the solution, and start the work on architectur=
e
>>> of the
>>> solution and the protocol applicability statements separately. An
>>> alternate
>>> would be to centralize the discussion on protocols to annex, and explai=
n
>>> that
>>> protocol A or B could be envisioned in solution space because to over
>>> this gap
>>> or implement that function.
>>>
>>> In any fashion, the current text is not ready for publication as
>>> applicability
>>> statement, architecture and or/solution, so the related work should be
>>> removed
>>> from the main text. But I find it mostly ready for use case and problem
>>> statement, more below.
>>>
>>> Review:
>>>
>>> Abstract
>>>
>>>    This document discusses the problem statement and use cases of
>>>    IPv6-based vehicular networking for Intelligent Transportation
>>>    Systems (ITS).
>>>
>>> >>> The document goes beyond that; there was actually a thread at 6MAN
>>> where
>>> Bob Hinden said =E2=80=9C This document says it is a problem statement,=
 but then
>>> becomes a solution document.   Might be better to cut it down to only t=
he
>>> problem statement part. =E2=80=9C >>> Would you consider doing this? If=
 not,
>>> why? Note:
>>> you may want to respond on 6MAN as well. >>> >>>I would have thought
>>> that the
>>> traditional steps of problem statement and applicability statement of
>>> existing
>>> work could be expected from IPWAVE too. >>> Please clarify the steps
>>> that you
>>> intend to follow next with this work.
>>>
>>> <snip>
>>>
>>> 1.  Introduction
>>>
>>> >>> Very readable and informative section, many thanks!
>>>
>>>    Along with these WAVE standards and C-V2X standards, regardless of a
>>>    wireless access technology under the IP stack of a vehicle, vehicula=
r
>>>    networks can operate IP mobility with IPv6 [RFC8200] and Mobile IPv6
>>>    protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (PMIPv6)
>>>    [RFC5213], Distributed Mobility Management (DMM) [RFC7333], Locator/
>>>    ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Extended
>>>    Route Optimization (AERO) [RFC6706BIS]).
>>>
>>> >>> NEMO (RFC 3963) is not cited. Any reason why the vehicle would not
>>> transport a network?
>>>
>>> <snip>
>>>
>>>    This document describes use cases and a problem statement about
>>>    IPv6-based vehicular networking for ITS, which is named IPv6 Wireles=
s
>>>    Access in Vehicular Environments (IPWAVE).  First, it introduces the
>>>    use cases for using V2V, V2I, and V2X networking in ITS.  Next, for
>>>    IPv6-based vehicular networks, it makes a gap analysis of current
>>>    IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Management,
>>>    and Security & Privacy), and then enumerates requirements for the
>>>    extensions of those IPv6 protocols, which are tailored to IPv6-based
>>>    vehicular networking.  Thus, this document is intended to motivate
>>>    development of key protocols for IPWAVE.
>>>
>>> >>>
>>>
>>> <snip>
>>>
>>> 2.  Terminology
>>>
>>> >>>
>>>
>>> <snip>
>>>
>>>    o  IP-OBU: "Internet Protocol On-Board Unit": An IP-OBU denotes a
>>>       computer situated in a vehicle (e.g., car, bicycle, autobike,
>>>       motor cycle, and a similar one) and a device (e.g., smartphone an=
d
>>>       IoT device).  It has at least one IP interface that runs in IEEE
>>>       802.11-OCB and has an "OBU" transceiver.  Also, it may have an IP
>>>       interface that runs in Cellular V2X (C-V2X) [TS-23.285-3GPP]
>>>       [TR-22.886-3GPP][TS-23.287-3GPP].  See the definition of the term
>>>       "OBU" in [RFC8691].
>>>
>>> >>> Can that be a router connecting multiple computers?
>>>
>>> <snip>
>>>
>>> 3.  Use Cases
>>>
>>> >>> This is another great read and an enlightening section. Maybe
>>> mention in
>>> the abstract that the doc also covers use cases?
>>>
>>> <snip>
>>>
>>>    Although a Layer-2 solution can provide a support for multihop
>>>    communications in vehicular networks, the scalability issue related
>>>    to multihop forwarding still remains when vehicles need to
>>>    disseminate or forward packets toward multihop-away destinations.  I=
n
>>>    addition, the IPv6-based approach for V2V as a network layer protoco=
l
>>>    can accommodate multiple radio technologies as MAC protocols, such a=
s
>>>    5G V2X and DSRC.  Therefore, the existing IPv6 protocol can be
>>>    augmented through the addition of an Overlay Multilink Network (OMNI=
)
>>>    Interface [OMNI] and/or protocol changes in order to support both
>>>    wireless single-hop/multihop V2V communications and multiple radio
>>>    technologies in vehicular networks.  In such a way, vehicles can
>>>    communicate with each other by V2V communications to share either an
>>>    emergency situation or road hazard in a highway having multiple kind=
s
>>>    of radio technologies, such as 5G V2X and DSRC.
>>>
>>> >>> This text appears in the middle of high level use case, with a crud=
e
>>> list
>>> of protocols; this is not a place for it
>>>
>>> >>> On a 6MAN Thread, Brian Carpenter said that the above:
>>> =E2=80=9C
>>> is of concern regardless of the mention of OMNI. Does it mean "can be" =
or
>>> "needs to be"? This paragraph seems like a very short summary of a big
>>> problem
>>> area. At the end of page 13 there is some related discussion, which
>>> mentions
>>> RPL as part of the solution (good choice, IMHO) but again seems to
>>> depend on
>>> OMNI. I don't think the fix of simply removing references to OMNI works=
,
>>> because it would leave a gap. In an informational document, that is not=
 a
>>> formal problem but as far as this draft describes architecture, I don't
>>> think
>>> that big a gap is reasonable. "OMNI" is mentioned more than 20 times in
>>> the
>>> document. There are also several references to AERO, which is strongly
>>> associated with OMNI. =E2=80=9C >>> I agree with Brian. Here the docume=
nt seems
>>> to be
>>> mixing solution with problem and putting the cart before the horse. My
>>> recommendation is to stick to what needs to be done that IPv6 does not
>>> do yet
>>> -the reqs and gaps-; but the doc should not step in the how things will
>>> be done
>>> unless the group already decided to do it. The logical next steps to a
>>> PS are
>>> an applicability statement of existing work, and if the gaps cannot be
>>> filled,
>>> there may be one or more WG chartered to fill those gaps.
>>>
>>> >>> I=E2=80=99d still be happy to see an annex with leads on where the =
solution
>>> might
>>> come from like RFC 8691 does.
>>>
>>> <snip>
>>>
>>>    The existing IPv6 protocol must be augmented through the addition of
>>>    an OMNI interface and/or protocol changes in order to support
>>>    wireless multihop V2I communications in a highway where RSUs are
>>>    sparsely deployed, so a vehicle can reach the wireless coverage of a=
n
>>>    RSU through the multihop data forwarding of intermediate vehicles.
>>>    Thus, IPv6 needs to be extended for multihop V2I communications.
>>>
>>> >>> Note that I have no clue on how well OMNI applies in that space,
>>> maybe it
>>> does very well; but here it comes out of the blue with no justification=
.
>>> If you
>>> mention OMNI you need to detail what it is and which of the V2V
>>> problems you
>>> expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.
>>>
>>> <snip>
>>>
>>>    The existing IPv6 protocol must be augmented through the addition of
>>>    an OMNI interface and/or protocol changes in order to support
>>>    wireless multihop V2X (or V2I2X) communications in an urban road
>>>    network where RSUs are deployed at intersections, so a vehicle (or a
>>>    pedestrian's smartphone) can reach the wireless coverage of an RSU
>>>    through the multihop data forwarding of intermediate vehicles (or
>>>    pedestrians' smartphones).  Thus, IPv6 needs to be extended for
>>>    multihop V2X (or V2I2X) communications.
>>>
>>> >>> Please be more specific on what the missing functions are and
>>> whether they
>>> are missing from the stack development standpoint or if there=E2=80=99s=
 work
>>> needed
>>> from the IETF. 1)      If something is really missing in our specs, the
>>> text to
>>> prove from the use case above is missing 2)      how OMNI serves the us=
e
>>> case
>>> could be elaborated in an applicability statement of OMNI for V2xyz, bu=
t
>>> it is
>>> a bit blunt to present it as panacea when the problems to be solved are
>>> not
>>> listed. 3)      If you look at it, OMNI seems like a software mobile
>>> router
>>> within a bump in the stack. Can that become too big?
>>>
>>> >>> my view is that the text above and the similar occasions should be
>>> replaced
>>> by something like :
>>>
>>>    The existing IPv6 protocol must be augmented to provide the followin=
g
>>>    functions: 1) =E2=80=A6
>>>
>>> >>> and / or something like:
>>>
>>>    In addition to the IPv6 node requirements [RFC 8504], the IPv6
>>> protocol
>>>    stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=A6
>>>
>>> <snip>
>>>
>>>    To support applications of these V2X use cases, the functions of IPv=
6
>>>    such as VND, VMM, and VSP are prerequisites for IPv6-based packet
>>>    exchange, transport-layer session continuity, and secure, safe
>>>    communication between a vehicle and a pedestrian either directly or
>>>    indirectly via an IP-RSU.
>>>
>>> >>> =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=9D d=
oes not parse.
>>> There=E2=80=99s
>>> no IPv6 reference that provides those functions. If the intention is to
>>> say
>>> that there=E2=80=99s stuff to add to IPv6 to support, like, say,  VND, =
then this
>>> document fails to define how an IPv6 VND should behave, though it=E2=80=
=99s
>>> precisely
>>> what I=E2=80=99d expect from a problem statement.
>>>
>>> <snip>
>>>
>>> 4.  Vehicular Networks
>>>
>>> >>> What is the purpose of section 4 as a whole, problem statement or
>>> applicability statement of the listed protocols? In the former case
>>> what=E2=80=99s the
>>> problem? In the latter case it is incomplete and needs to be exported t=
o
>>> an
>>> applicability statement doc with all the possible technologies evaluate=
d.
>>>
>>>    This section describes an example vehicular network architecture
>>>    supporting V2V, V2I, and V2X communications in vehicular networks.
>>>
>>> >>> I read this as presenting a context to explain what the problems ar=
e
>>> instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe =
using the term
>>> =E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=
=99s comment.
>>>
>>> <snip>
>>>
>>> 4.1.  Vehicular Network Architecture
>>>
>>>    Figure 1 shows an example vehicular network architecture for V2I and
>>>    V2V in a road network [OMNI].
>>>
>>> a.      Is using OMNI a decision that the WG made for the future work ?
>>> what
>>> does it do and what does it not do? b.      Is there work left to be
>>> done? Who
>>> will do that work? Or is it the expectation that OMNI has it all define=
d
>>> already?
>>>
>>> <snip>
>>>
>>>    An existing network architecture (e.g., an IP-based aeronautical
>>>    network architecture [OMNI][UAM-ITS], a network architecture of
>>>    PMIPv6 [RFC5213], and a low-power and lossy network architecture
>>>    [RFC6550]) can be extended to a vehicular network architecture for
>>>    multihop V2V, V2I, and V2X, as shown in Figure 1.  In a highway
>>>    scenario, a vehicle may not access an RSU directly because of the
>>>    distance of the DSRC coverage (up to 1 km).  For example, the OMNI
>>>    interface and/or RPL (IPv6 Routing Protocol for Low-Power and Lossy
>>>    Networks) [RFC6550] can be extended to support a multihop V2I since =
a
>>>    vehicle can take advantage of other vehicles as relay nodes to reach
>>>    the RSU.  Also, RPL can be extended to support both multihop V2V and
>>>    V2X in the similar way.
>>>
>>> >>> all this could fit well in annex; anyway you need to explain what y=
ou
>>> expect the protocols to do and which extension is needed. In the case o=
f
>>> RPL at
>>> least you indicate that it would do routing, but not why you cannot use
>>> it of
>>> the shelf; for OMNI, what you expect is less clear, though there=E2=80=
=99s text
>>> elsewhere about the many radio interfaces that could be used for the
>>> purpose,
>>> and the text in the UAM below that is enlightening.
>>>
>>> <snip>
>>>
>>>                                   To support not only the mobility
>>>    management of the UAM end systems, but also the multihop and
>>>    multilink communications of the UAM interfaces, the UAM end systems
>>>    can employ an Overlay Multilink Network (OMNI) interface [OMNI] as a
>>>    virtual Non-Broadcast Multiple Access (NBMA) connection to a serving
>>>    ground domain infrastructure.
>>>
>>> >>> Again, what is the expectation for OMNI? As an overlay it requires =
an
>>> underlay; when connecting to a MANET it needs support for that MANET.
>>> The text
>>> above seems to imply that is solves everything in V2xyz like magic;
>>> reminds me
>>> of the IPv6 multicast abstraction that was supposed to solve the
>>> broadcast
>>> problem and ended up worsening it.
>>>
>>> <snip>
>>>
>>>                             This infrastructure can be configured
>>>    over the underlying data links.  The OMNI interface and its link
>>>    model provide a means of multilink, multihop and mobility
>>>    coordination to the legacy IPv6 ND messaging [RFC4861] according to
>>>    the NBMA principle.  Thus, the OMNI link model can support efficient
>>>    UAM internetworking services without additional mobility messaging,
>>>    and without any modification to the IPv6 ND messaging services or
>>>    link model.
>>>
>>> >>> Again, what is the expectation for OMNI? As an overlay it requires =
an
>>> underlay; the text above seems to imply that is solves everything in
>>> V2xyz like
>>> magic; that would be a stretch, that reminds me of IPv6 multicast that
>>> was
>>> supposed to solve the broadcast problem and ended up worsening it.
>>>
>>> <snip>
>>>
>>>    Multiple vehicles under the coverage of an RSU share a prefix just a=
s
>>>    mobile nodes share a prefix of a Wi-Fi access point in a wireless
>>>    LAN.  This is a natural characteristic in infrastructure-based
>>>    wireless networks.  For example, in Figure 1, two vehicles (i.e.,
>>>    Vehicle2, and Vehicle5) can use Prefix 1 to configure their IPv6
>>>    global addresses for V2I communication.  Alternatively, mobile nodes
>>>    can employ an OMNI interface and use their own IPv6 Unique Local
>>>    Addresses (ULAs) [RFC4193] over the wireless network without
>>>    requiring the messaging of IPv6 Stateless Address Autoconfiguration
>>>   (SLAAC) [RFC4862], which uses an on-link prefix provided by the
>>>    (visited) wireless LAN; this technique is known as "Bring-Your-Own-
>>>    Addresses".
>>>
>>> >>>  Is OMNI the only way to "Bring-Your-Own-Addresses=E2=80=9D? Else t=
he text
>>> could be
>>> more generic, at least use e.g., like the ref to AERO later. >>> What
>>> are the
>>> implications / limitations of doing that =E2=80=93 like they can do lin=
e of
>>> sight V2V
>>> but not reach the internet, or the need of  a local MANET / RPL that wi=
ll
>>> accept to route those addresses, or the security / address ownership
>>> validation
>>> issues ?
>>>
>>> <snip>
>>>
>>>    A single subnet prefix announced by an RSU can span multiple vehicle=
s
>>>    in VANET.  For example, in Figure 1, for Prefix 1, three vehicles
>>>    (i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a connected
>>>    VANET.  Also, for Prefix 2, two vehicles (i.e., Vehicle3 and
>>>    Vehicle6) can construct another connected VANET, and for Prefix 3,
>>>    two vehicles (i.e., Vehicle4 and Vehicle7) can construct another
>>>    connected VANET.  Alternatively, each vehicle could employ an OMNI
>>>    interface with their own ULAs such that no topologically-oriented
>>>    subnet prefixes need be announced by the RSU.
>>>
>>> >>>  same as above. This seems to restate the same thing, derive an
>>> address
>>> from a topologically correct prefix or use your own with limitations to
>>> be
>>> described.
>>>
>>> <snip>
>>>
>>>    For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]
>>>    specifies several details, including Maximum Transmission Unit (MTU)=
,
>>>    frame format, link-local address, address mapping for unicast and
>>>    multicast, stateless autoconfiguration, and subnet structure.  An
>>>    Ethernet Adaptation (EA) layer is in charge of transforming some
>>>    parameters between the IEEE 802.11 MAC layer and the IPv6 network
>>>    layer, which is located between the IEEE 802.11-OCB's logical link
>>>    control layer and the IPv6 network layer.  This IPv6 over 802.11-OCB
>>>    can be used for both V2V and V2I in IPv6-based vehicular networks.
>>>
>>> >>>  solution space.
>>>
>>> <snip>
>>>
>>>    An IPv6 mobility solution is needed for the guarantee of
>>>    communication continuity in vehicular networks so that a vehicle's
>>>    TCP session can be continued, or UDP packets can be delivered to a
>>>    vehicle as a destination without loss while it moves from an IP-RSU'=
s
>>>    wireless coverage to another IP-RSU's wireless coverage.  In
>>>    Figure 1, assuming that Vehicle2 has a TCP session (or a UDP session=
)
>>>    with a corresponding node in the vehicular cloud, Vehicle2 can move
>>>    from IP-RSU1's wireless coverage to IP-RSU2's wireless coverage.  In
>>>    this case, a handover for Vehicle2 needs to be performed by either a
>>>    host-based mobility management scheme (e.g., MIPv6 [RFC6275]) or a
>>>    network-based mobility management scheme (e.g., PMIPv6 [RFC5213] and
>>>    AERO [RFC6706BIS]).
>>>
>>>    In the host-based mobility scheme (e.g., MIPv6), an IP-RSU plays a
>>>    role of a home agent.  On the other hand, in the network-based
>>>    mobility scheme (e.g., PMIPv6, an MA plays a role of a mobility
>>>    management controller such as a Local Mobility Anchor (LMA) in
>>>    PMIPv6, which also serves vehicles as a home agent, and an IP-RSU
>>>    plays a role of an access router such as a Mobile Access Gateway
>>>    (MAG) in PMIPv6 [RFC5213].  The host-based mobility scheme needs
>>>    client functionality in IPv6 stack of a vehicle as a mobile node for
>>>    mobility signaling message exchange between the vehicle and home
>>>    agent.  On the other hand, the network-based mobility scheme does no=
t
>>>    need such a client functionality for a vehicle because the network
>>>    infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility agent
>>>    handles the mobility signaling message exchange with the home agent
>>>    (e.g., LMA in PMIPv6) for the sake of the vehicle.
>>>
>>>    There are a scalability issue and a route optimization issue in the
>>>    network-based mobility scheme (e.g., PMIPv6) when an MA covers a
>>>    large vehicular network governing many IP-RSUs.  In this case, a
>>>    distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate the
>>>    scalability issue by distributing multiple MAs in the vehicular
>>>    network such that they are positioned closer to vehicles for route
>>>    optimization and bottleneck mitigation in a central MA in the
>>>    network-based mobility scheme.  All these mobility approaches (i.e.,
>>>    a host-based mobility scheme, network-based mobility scheme, and
>>>    distributed mobility scheme) and a hybrid approach of a combination
>>>    of them need to provide an efficient mobility service to vehicles
>>>    moving fast and moving along with the relatively predictable
>>>    trajectories along the roadways.
>>>
>>>    In vehicular networks, the control plane can be separated from the
>>>    data plane for efficient mobility management and data forwarding by
>>>    using the concept of Software-Defined Networking (SDN)
>>>    [RFC7149][DMM-FPC].  Note that Forwarding Policy Configuration (FPC)
>>>    in [DMM-FPC], which is a flexible mobility management system, can
>>>    manage the separation of data-plane and control-plane in DMM.  In
>>>    SDN, the control plane and data plane are separated for the efficien=
t
>>>    management of forwarding elements (e.g., switches and routers) where
>>>    an SDN controller configures the forwarding elements in a centralize=
d
>>>    way and they perform packet forwarding according to their forwarding
>>>    tables that are configured by the SDN controller.  An MA as an SDN
>>>    controller needs to efficiently configure and monitor its IP-RSUs an=
d
>>>    vehicles for mobility management, location management, and security
>>>    services.
>>>
>>>    The mobility information of a GPS receiver mounted in its vehicle
>>>    (e.g., position, speed, and direction) can be used to accommodate
>>>    mobility-aware proactive handover schemes, which can perform the
>>>    handover of a vehicle according to its mobility and the wireless
>>>    signal strength of a vehicle and an IP-RSU in a proactive way.
>>>
>>>    Vehicles can use the TCC as their Home Network having a home agent
>>>    for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5213],
>>>    so the TCC (or an MA inside the TCC) maintains the mobility
>>>    information of vehicles for location management.  IP tunneling over
>>>    the wireless link should be avoided for performance efficiency.
>>>    Also, in vehicular networks, asymmetric links sometimes exist and
>>>    must be considered for wireless communications such as V2V and V2I.
>>>
>>> >>>  This is all very informative text but does not state a problem. Is
>>> there a
>>> problem is left to be solved or are we assessing the applicability of
>>> protocols? Could it for instance, forward point to issues discussed in
>>> section
>>> 5?
>>>
>>> <snip>
>>>
>>>    As shown in Figure 3, as internal networks, a vehicle's moving
>>>    network and an EN's fixed network are self-contained networks having
>>>    multiple subnets and having an edge router (e.g., IP-OBU and IP-RSU)
>>>    for the communication with another vehicle or another EN.  The
>>>    internetworking between two internal networks via V2I communication
>>>    requires the exchange of the network parameters and the network
>>>    prefixes of the internal networks.  For the efficiency, the network
>>>    prefixes of the internal networks (as a moving network) in a vehicle
>>>    need to be delegated and configured automatically.  Note that a
>>>    moving network's network prefix can be called a Mobile Network Prefi=
x
>>>    (MNP) [OMNI].
>>>
>>> >>> Then again you=E2=80=99re overselling OMNI. MNP is originally defin=
ed here
>>> https://datatracker.ietf.org/doc/html/rfc3963#section-2 and that=E2=80=
=99s a
>>> reference
>>> you can use normatively.
>>>
>>> <snip>
>>>
>>>    As shown in Figure 3, the addresses used for IPv6 transmissions over
>>>    the wireless link interfaces for IP-OBU and IP-RSU can be either
>>>    global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets can be
>>>    routed within vehicular networks [OMNI].
>>>
>>> >>> Then again you=E2=80=99re overselling OMNI. There needs to  be a ro=
uting
>>> protocol
>>> like a MANET that will accept to carry the
>>>  MNPs, and that must be implemented by the infra and both cars. The OMN=
I
>>> spec
>>>  is clear on that. This is why at first glance I see OMNI as a full
>>> mobile
>>>  router in a bump in the stack. Now what is the problem behind this? No
>>> such
>>>  protocol at IETF? Too many to choose from? No deployment?
>>> <snip>
>>>
>>> When global IPv6 addresses
>>>    are used, wireless interface configuration and control overhead for
>>>    Duplicate Address Detection (DAD) [RFC4862] and Multicast Listener
>>>    Discovery (MLD) [RFC2710][RFC3810] should be minimized to support V2=
I
>>>    and V2X communications for vehicles moving fast along roadways; when
>>>    ULAs and the OMNI interface are used, no DAD nor MLD messaging is
>>>    needed.
>>>
>>> >>> Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it the no=
 dad needed a
>>> property
>>> of injecting a BYOA in the fabric for an GUA MIP Home Address which is
>>> known to
>>> be unique at home? >>> OTOH, autoconf=E2=80=99ing a random ULA =E2=80=
=9CFD=E2=80=A6=E2=80=9Dprefix has
>>> lesser
>>> DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classi=
cal
>>> subnet. So
>>> who says DAD isn=E2=80=99t required for OMNI ULA? >>> note that IMHO DA=
D on
>>> wireless is
>>> a lot more harm than good, and I agree that with a good pseudo random
>>> generator
>>> the ULA has no chance to collision in the real world, as OMNI claims.
>>> It=E2=80=99s just
>>> that your argument here plays the other way, because there are less
>>> random bits
>>> (56)  in the ULA prefix than in the IID (62), and if one starts using
>>> more
>>> prefix bits to be non-random, there will be a time when DAD on prefix i=
s
>>> needed.
>>>
>>> <snip>
>>>
>>>    Let us consider the upload/download time of a vehicle when it passes
>>>    through the wireless communication coverage of an IP-RSU.  For a
>>>    given typical setting where 1km is the maximum DSRC communication
>>>    range [DSRC] and 100km/h is the speed limit in highway, the dwelling
>>>    time can be calculated to be 72 seconds by dividing the diameter of
>>>    the 2km (i.e., two times of DSRC communication range where an IP-RSU
>>>    is located in the center of the circle of wireless communication) by
>>>    the speed limit of 100km/h (i.e., about 28m/s).  For the 72 seconds,
>>>    a vehicle passing through the coverage of an IP-RSU can upload and
>>>    download data packets to/from the IP-RSU.
>>>
>>> <snip>
>>>
>>> 4.3.  V2V-based Internetworking
>>>
>>> >>> In this section it looks like the cars are in a stable line of sigh=
t
>>> relationship. Which is probably fine for a platoon, but when you drive
>>> along
>>> with friends in different cars, you realize that the line of sight
>>> assumption
>>> does not stand over time. Soon enough, other cars meddle in, and
>>> possibly one
>>> of the cars drives faster and too far ahead so you need the infra to
>>> relay,
>>> possibly over multiple infra hops.
>>>
>>> >>> so in this section, I=E2=80=99d expect to see a Vehicle communicati=
ng with
>>> another
>>> one and using either line of sight or V2V relaying but also using relay
>>> via V2I
>>> (multihop I2I not just hub and spoke V2I2V ), alternatively to together
>>> for
>>> redundancy. Is that part of the problem?
>>>
>>> >>> reading deeper section 5 I found excellent text on routing via V an=
d
>>> via I.
>>> This tells that section 4 does not play a good role at justifying
>>> section 5.
>>> Maybe keep section 4 for another doc?
>>>
>>> >>> What kind or reliability is required in a V2V use case? Do you thin=
k
>>> ND can
>>> handle it? Or MANET? What would be the assumption on L2 (roaming time,
>>> unicast
>>> vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3
>>> redundancy?
>>>
>>> <snip>
>>>
>>> 5.  Problem Statement
>>>
>>> <snip>
>>>
>>>    In order to specify protocols using the architecture mentioned in
>>>    Section 4.1, IPv6 core protocols have to be adapted to overcome
>>>    certain challenging aspects of vehicular networking.  Since the
>>>    vehicles are likely to be moving at great speed, protocol exchanges
>>>    need to be completed in a time relatively short compared to the
>>>    lifetime of a link between a vehicle and an IP-RSU, or between two
>>>    vehicles.
>>>
>>> >>> Any order of magnitude?
>>> >>> Can you indicate whether this already rules out certain procedures,
>>> e.g.
>>> DAD ?
>>>
>>>    The lifetime of a session varies depending on the session's type suc=
h
>>>    as a web surfing, voice call over IP, and DNS query.  Regardless of =
a
>>>    session's type, to guide all the IPv6 packets to their destination
>>>    host, IP mobility should be supported for the session.
>>>
>>> >>> this seems to be for unicast when you know who to talk to. Is there
>>> a need
>>> some multicast groups like anybody around interested in topic blah like
>>> I could
>>> be multicasting the speed of vehicles coming the other way that I cross=
ed
>>> recently, for use of vehicles that I=E2=80=99m crossing now, so they ca=
n see a
>>> slowdown
>>> on advance
>>>
>>>    Thus, the time constraint of a wireless link has a major impact on
>>>    IPv6 Neighbor Discovery (ND).  Mobility Management (MM) is also
>>>    vulnerable to disconnections that occur before the completion of
>>>    identity verification and tunnel management.  This is especially tru=
e
>>>    given the unreliable nature of wireless communication.  This section
>>>    presents key topics such as neighbor discovery and mobility
>>>    management.
>>>
>>> >>> Only ND? What about the MANET?
>>> >>> how fast should ND be to be suitable?
>>> >>> is there also a bandwidth check? You can make things much faster if
>>> you
>>> dedicate a lot of spectrum to it. But that can also be a waste.
>>>
>>> 5.1.  Neighbor Discovery
>>>
>>> <snip>
>>>
>>>    The requirements for IPv6 ND for vehicular networks are efficient DA=
D
>>>    and NUD operations.
>>>
>>> >>> Not lookup? Is it the intention to use IP unicast over MAC
>>> broadcast, which
>>> is a good idea in my book?
>>>
>>>  <snip>
>>>
>>>       This merging and partitioning should be considered for the
>>>    IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAAC)
>>>    [RFC4862].
>>>
>>> >>> Not lookup? Is it the intention to use IP unicast over MAC
>>> broadcast, which
>>> is a good idea in my book?
>>>
>>>  <snip>
>>>
>>>    Also, the partitioning of a VANET may make vehicles with the same
>>>    prefix be physically unreachable.  Also, SLAAC needs to prevent IPv6
>>>    address duplication due to the merging of VANETs.  According to the
>>>    merging and partitioning, a destination vehicle (as an IPv6 host)
>>>    needs to be distinguished as either an on-link host or an off-link
>>>    host even though the source vehicle uses the same prefix as the
>>>    destination vehicle.
>>>
>>> >>> should reference to draft-nordmark-intarea-ippl
>>>
>>>    To efficiently prevent IPv6 address duplication due to the VANET
>>>    partitioning and merging from happening in vehicular networks, the
>>>    vehicular networks need to support a vehicular-network-wide DAD by
>>>    defining a scope that is compatible with the legacy DAD.  In this
>>>    case, two vehicles can communicate with each other when there exists
>>>    a communication path over VANET or a combination of VANETs and IP-
>>>    RSUs, as shown in Figure 1.  By using the vehicular-network-wide DAD=
,
>>>    vehicles can assure that their IPv6 addresses are unique in the
>>>    vehicular network whenever they are connected to the vehicular
>>>    infrastructure or become disconnected from it in the form of VANET.
>>>
>>> >>> Excellent
>>>
>>>    ND time-related parameters such as router lifetime and Neighbor
>>>    Advertisement (NA) interval need to be adjusted for vehicle speed an=
d
>>>    vehicle density.  For example, the NA interval needs to be
>>>    dynamically adjusted according to a vehicle's speed so that the
>>>    vehicle can maintain its neighboring vehicles in a stable way,
>>>    considering the collision probability with the NA messages sent by
>>>    other vehicles.
>>>
>>> >>> Is that a problem or just an operational setting that needs to be
>>> found?
>>> >>> Do we need to reconsider the concepts of those timers?
>>>
>>> <snip>
>>>
>>>    Thus, in IPv6-based vehicular networking, IPv6 ND should have minimu=
m
>>>    changes for the interoperability with the legacy IPv6 ND used in the
>>>    Internet, including the DAD and NUD operations.
>>>
>>> >>> I do not find the logical link with the text before, why is this a
>>> =E2=80=9Cthus=E2=80=9D?
>>> >>> why should the ND inside the VANET be constrained to be
>>> interoperable? This
>>> may place constraints on the solution.
>>>
>>> 5.1.1.  Link Model
>>>
>>>    A prefix model for a vehicular network needs to facilitate the
>>>
>>> >>> Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=80=
=9Cprefix model=E2=80=9D.
>>> >>> it would make this piece and the next should refer to
>>> draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for bot=
h
>>> link
>>> and subnet issues. The general ideas are the same, but the gory details
>>> here
>>> are slightly incorrect, like this notion of prefix model than comes out
>>> of the
>>> blue. The model is really the subnet model for the subnet associated to
>>> P2MP.
>>>
>>>    communication between two vehicles with the same prefix regardless o=
f
>>>    the vehicular network topology as long as there exist bidirectional
>>>    E2E paths between them in the vehicular network including VANETs and
>>>    IP-RSUs.  This prefix model allows vehicles with the same prefix to
>>>    communicate with each other via a combination of multihop V2V and
>>>    multihop V2I with VANETs and IP-RSUs.  Note that the OMNI interface
>>>    supports an NBMA link model where multihop V2V and V2I communication=
s
>>>    use each mobile node's ULAs without need for any DAD or MLD
>>>    messaging.
>>>
>>> >>> again overselling OMNI.
>>> >>> I kinda agree about the OMNI interface model, nothing against that.
>>> But you
>>> must see that there needs a lot more than what the OMNI interface to ge=
t
>>> packets across V and I hops to the destination. Like routing ala MANET,
>>> redundancy handling ala DetNet because it will be very lossy, path
>>> management
>>> ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND =
so it
>>> does not
>>> solve the ND problems above.
>>>
>>>    IPv6 protocols work under certain assumptions that do not necessaril=
y
>>>    hold for vehicular wireless access link types other than OMNI/NBMA
>>>    [VIP-WAVE][RFC5889]; the rest of this section discusses implications
>>>    for those link types that do not apply when the OMNI/NBMA link model
>>>
>>> >>> again overselling OMNI.
>>> >>> The keyword here is P2MP / NBMA, and OMNI is one interface that
>>> accepts
>>> that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already=
 P2MP /
>>> NBMA,
>>> using routing to complete the partial mesh in P2MP. The text seems to
>>> imply
>>> that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMN=
I is
>>> loaded with
>>> other stuff than a plain P2MP capable interface. And ND over P2MP is no=
t
>>> done
>>> by OMNI, OMNI only makes classical ND worse and only works in a full
>>> mesh. OTOH
>>> RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work
>>> very well
>>> within an OMNI interface and solve those problems. >>> My point is that
>>> you
>>> need to tell the full story or refrain from entering solution space in
>>> this doc
>>>
>>> <snip>
>>>
>>>    There is a relationship between a link and a prefix, besides the
>>>    different scopes that are expected from the link-local and global
>>>    types of IPv6 addresses.  In an IPv6 link, it is assumed that all
>>>    interfaces which are configured with the same subnet prefix and with
>>>    on-link bit set can communicate with each other on an IPv6 link.
>>>
>>> >>> not assumed; that=E2=80=99s what the onlink but set tells. The conc=
lusion
>>> should be
>>> that the VANET cannot set the O bit.
>>>
>>>    However, the vehicular link model needs to define the relationship
>>>    between a link and a prefix, considering the dynamics of wireless
>>>    links and the characteristics of VANET.
>>>
>>> <snip>
>>>
>>>    From the previous observation, a vehicular link model should conside=
r
>>>    the frequent partitioning and merging of VANETs due to vehicle
>>>    mobility.  Therefore, the vehicular link model needs to use an on-
>>>    link prefix and off-link prefix according to the network topology of
>>>    vehicles such as a one-hop reachable network and a multihop reachabl=
e
>>>
>>> >>> No, the once a node saw a O bit set that sticks even if it sees oth=
er
>>> advertisements of the PIO with the O bit not set. >>> This is a global
>>> and
>>> intrinsic property of the prefix (and an attack vector that could be
>>> mentioned
>>> in the sec section). >>> the VANET prefix must never come with the O bi=
t
>>> set.
>>>
>>> <snip>
>>>
>>>    network (or partitioned networks).  If the vehicles with the same
>>>    prefix are reachable from each other in one hop, the prefix should b=
e
>>>    on-link.
>>>
>>> >>>> No, see above; but the router may redirect though it is really ris=
ky
>>> unless this is a stable situation like a parking place.
>>>
>>>    Thus, in IPv6-based vehicular networking, the vehicular link model
>>>    should have minimum changes for interoperability with standard IPv6
>>>    links in an efficient fashion to support IPv6 DAD, MLD and NUD
>>>    operations.  When the OMNI NBMA link model is used, there are no lin=
k
>>>    model changes nor DAD/MLD messaging required.
>>>
>>> >>>> again overselling OMNI.
>>> >>>> You need a good P2MP subnet model with routing support when the
>>> mesh is
>>> partial. My company alone has been shipping million of nodes that build
>>> subnets
>>> of thousands, and that was done using IETF standards.
>>>
>>> <snip>
>>>
>>>    For vehicular networks with high mobility and density, the DAD needs
>>>    to be performed efficiently with minimum overhead so that the
>>>    vehicles can exchange a driving safety message (e.g., collision
>>>    avoidance and accident notification) with each other with a short
>>>    interval (e.g., 0.5 second) by a technical report from NHTSA
>>>    (National Highway Traffic Safety Administration) [NHTSA-ACAS-Report]=
.
>>>    Such a driving safety message may include a vehicle's mobility
>>>    information (i.e., position, speed, direction, and acceleration/
>>>    deceleration).  The exchange interval of this message is 0.5 second,
>>>    which is required to allow a driver to avoid a rear-end crash from
>>>    another vehicle.
>>>
>>> >>> IPv6 over broadcast MAC (used to be called internet 0, 10+ years ag=
o)
>>> solves that MAC issue since there is no MAC.
>>>
>>> 5.1.3.  Routing
>>>
>>>    For multihop V2V communications in either a VANET or VANETs via IP-
>>>    RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing protocol ma=
y
>>>    be required to support both unicast and multicast in the links of th=
e
>>>    subnet with the same IPv6 prefix.  However, it will be costly to run
>>>    both vehicular ND and a vehicular ad hoc routing protocol in terms o=
f
>>>    control traffic overhead [ID-Multicast-Problems].
>>>
>>> >>> we do that with IETF standards on battery operated devices already.
>>> Using
>>> RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve=
 seen 30
>>> hops in
>>> meshes of thousands in the real world though it=E2=80=99s not the norma=
l
>>> operational
>>> model, but can happen to maintain connectivity during the reboot of a
>>> root) and
>>> does not use broadcast. RPL was initially designed as a V2V2V protocol
>>> but
>>> found its market on the IoT. I=E2=80=99m sure the protocol would gladly=
 come
>>> back to
>>> its roots.
>>>
>>>    A routing protocol for a VANET may cause redundant wireless frames i=
n
>>>    the air to check the neighborhood of each vehicle and compute the
>>>    routing information in a VANET with a dynamic network topology
>>>    because the IPv6 ND is used to check the neighborhood of each
>>>    vehicle.  Thus, the vehicular routing needs to take advantage of the
>>>    IPv6 ND to minimize its control overhead.
>>>
>>> >>> A clean description of the interaction of RPL and RFC 8505 in our I=
oT
>>> networks. Note that the speed of the PHY in VANET balanced the
>>> instability of
>>> the topology, and RPL still applies. Note also that RPL uses DV with a
>>> routing
>>> stretch in order to minimize the topology awareness that=E2=80=99s need=
ed in
>>> each node,
>>> which results in minimal signaling.
>>>
>>> 5.2.  Mobility Management
>>>
>>> <snip>
>>>
>>>    For a mobility management scheme in a shared link, where the wireles=
s
>>>    subnets of multiple IP-RSUs share the same prefix, an efficient
>>>    vehicular-network-wide DAD is required.  If DHCPv6 is used to assign
>>>    a unique IPv6 address to each vehicle in this shared link,
>>>
>>> >>> I would not use the term link, or shared. Maybe shared link ->
>>> domain?
>>> <snip>
>>>
>>> the DAD is
>>>    not required.  On the other hand, for a mobility management scheme
>>>    with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] and OMN=
I
>>>    [OMNI]), DAD is not required because the IPv6 address of a vehicle's
>>>    external wireless interface is guaranteed to be unique.
>>>
>>> >>> again overselling OMNI
>>> >>> As I said earlier, this is wring there are (64*) more chances of a
>>> collision in OMNI prefixes than in IPv6 IIDs. >>> OMNI prefixes can
>>> collision,
>>> home addresses that are unique on a home network cannot. >>> Now if bot=
h
>>> the
>>> OMNI prefix and the IID are good randoms, then obviously, the chances o=
f
>>> collisions round up to 0. >>> Collision is certainly not my worst fear.
>>>
>>>   There is a
>>>    tradeoff between the prefix usage efficiency and DAD overhead.  Thus=
,
>>>    the IPv6 address autoconfiguration for vehicular networks needs to
>>>    consider this tradeoff to support efficient mobility management.
>>>
>>> >>> This is way too superficial and hides the reality of things.
>>> - Using a VANET Infra prefix allows direct routability to the internet
>>> which
>>> BYOA does not since the BYOA is not topologically correct. Yes, it cost=
s
>>> a DAD
>>> with classic ND, but it does not with RCF8505 and the draft fails to
>>> mention
>>> that. - A BYOA needs a tunnel home, and the node needs to know who is
>>> reachable
>>> inside the VANET and what is not to decide to tunnel or not; this is a
>>> difficult problem (vs. control place overhead) that is not discussed
>>> here.
>>>
>>> <snip>
>>>
>>>    For the case of a multihomed network, a vehicle can follow the first=
-
>>>    hop router selection rule described in [RFC8028].  That is, the
>>>    vehicle should select its default router for each prefix by
>>>    preferring the router that advertised the prefix.
>>>
>>> >>> Still router discovery (in and out) must be very fast. Thing of the
>>> RA
>>> intervale in MIPv6. Is that sufficient? Too expensive?
>>>
>>> <snip>
>>>
>>> 6.  Security Considerations
>>> >>> Any discussion on the security of classical ND and other operationa=
l
>>> issues
>>> (rfc6583) ?
>>>
>>> <snip>
>>>
>>>    Security and privacy are paramount in V2I, V2V, and V2X networking.
>>>    Vehicles and infrastructure must be authenticated in order to
>>>    participate in vehicular networking.  Also, in-vehicle devices (e.g.=
,
>>>    ECU) and a driver/passenger's mobile devices (e.g., smartphone and
>>>    tablet PC) in a vehicle need to communicate with other in-vehicle
>>>    devices and another driver/passenger's mobile devices in another
>>>    vehicle, or other servers behind an IP-RSU in a secure way.  Even
>>>    though a vehicle is perfectly authenticated and legitimate, it may b=
e
>>>    hacked for running malicious applications to track and collect its
>>>    and other vehicles' information.  In this case, an attack mitigation
>>>    process may be required to reduce the aftermath of malicious
>>>    behaviors.
>>>
>>> >>> The section should mention that both with classical ND and BYOA,
>>> addresses
>>> can be impersonated, and RFC 8928 protects against that in both cases
>>> while
>>> maintaining privacy.
>>>
>>>    Even though vehicles can be authenticated with valid certificates by
>>>    an authentication server in the vehicular cloud, the authenticated
>>>
>>> >>> Is PKI feasible (deploying it in every car?). Is it fast enough? Is
>>> it
>>> really what IPWAVE thinks vehicle should use????? >>> e.g. why would on=
e
>>> need
>>> to authenticate to a V2I network? >>> from the text earlier in the doc,
>>> it
>>> seemed that what you really want is access that is fast to join, capabl=
e
>>> of
>>> offering the reachability you want, anonymous, and innocuous (cars can
>>> not harm
>>> one another).
>>>
>>>    vehicles may harm other vehicles, so their communication activities
>>>    need to be logged in either a central way through a logging server
>>>    (e.g., TCC) in the vehicular cloud or a distributed way (e.g.,
>>>    blockchain [Bitcoin]) along with other vehicles or infrastructure.
>>>    For the non-repudiation of the harmful activities of malicious nodes=
,
>>>    a blockchain technology can be used [Bitcoin].  Each message from a
>>>    vehicle can be treated as a transaction and the neighboring vehicles
>>>    can play the role of peers in a consensus method of a blockchain
>>>    [Bitcoin][Vehicular-BlockChain].  For a blockchain's efficient
>>>    consensus in vehicular networks having fast moving vehicles, a new
>>>    consensus algorithm needs to be developed or an existing consensus
>>>    algorithm needs to be enhanced.
>>>
>>> >>> solution space; better express the  security needs since this is a
>>> PS.
>>>
>>> <snip>
>>>
>>>    To identify malicious vehicles among vehicles, an authentication
>>>    method is required.
>>>
>>> >>> No. As said earlier a vehicle can be infected. You need
>>> innocuousness.which
>>> can come from things like isolation, zerotrust, and protocols that are
>>> difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 =
is
>>> protected by construction, anonymous, and fast.
>>>
>>> <snip>
>>>
>>>    For the setup of a secure channel over IPsec or TLS, the multihop V2=
I
>>>    communications over DSRC is required in a highway for the
>>>    authentication by involving multiple intermediate vehicles as relay
>>>    nodes toward an IP-RSU connected to an authentication server in the
>>>    vehicular cloud.  The V2I communications over 5G V2X (or LTE V2X) is
>>>    required to allow a vehicle to communicate directly with a gNodeB (o=
r
>>>    eNodeB) connected to an authentication server in the vehicular cloud=
.
>>>
>>> >>> solution space. Instead, you could mention that setting up secured
>>> channels
>>> between cars that cross one another might not complete in time to
>>> establish the
>>> communication channel, and that the innocuousness must come from
>>> zerotrust in
>>> the transactions between the cars.
>>>    For the IPv6 ND, the DAD is required to ensure the uniqueness of the
>>>    IPv6 address of a vehicle's wireless interface.
>>>
>>> >>> for classical ND (SLAAC) that=E2=80=99s true. That is not with RFC =
8505,
>>> since the
>>> infra maintains a table of all addresses in use in the prefix and block=
s
>>> duplicates without the RFC 4862 DAD method. The stateful autoconf
>>> address grant
>>> is immediate.
>>>
>>>                                This DAD can be used
>>>    as a flooding attack that uses the DAD-related ND packets
>>>    disseminated over the VANET or vehicular networks.
>>>
>>> >>> also for DOS attacks. You can block a owner from using an address. =
A
>>> reference to rfc6959 is much needed here.
>>>
>>> <snip>
>>>
>>>  This possibility
>>>    indicates that the vehicles and IP-RSUs need to filter out suspiciou=
s
>>>    ND traffic in advance.  Based on the SEND [RFC3971] mechanism, the
>>>    authentication for routers (i.e., IP-RSUs) can be conducted by only
>>>    selecting an IP-RSU that has a certification path toward trusted
>>>    parties.  For authenticating other vehicles, the cryptographically
>>>    generated address (CGA) can be used to verify the true owner of a
>>>    received ND message, which requires to use the CGA ND option in the
>>>    ND protocols.  For a general protection of the ND mechanism, the RSA
>>>    Signature ND option can also be used to protect the integrity of the
>>>    messages by public key signatures.  For a more advanced
>>>    authentication mechanism, a distributed blockchain-based mechanism
>>>    [Vehicular-BlockChain] can be used.
>>>
>>> >>> solution space. Again, the draft should focus on problems and needs=
.
>>> The
>>> problem here is that SEND is complex, and not implemented in the major
>>> stack.
>>> It relies on PKI for trusting the router. The V2I need is a zerotrust
>>> model
>>> where one V, the other local Vs, and the I, can help each other
>>> anonymously and
>>> harmlessly. <snip>
>>>
>>> 8.  Informative References
>>>
>>> >>> no normative reference?
>>>
>>> >>> no normative reference?
>>>
>>> <snip>
>>>
>>> Voila!
>>>
>>> Keep safe;
>>>
>>> Pascal
>>>
>>>
>>>
>>> _______________________________________________
>>> its mailing list
>>> its@ietf.org
>>> https://www.ietf.org/mailman/listinfo/its
>>>
>>

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<div dir=3D"ltr">Thanks a lot Pascal! This is extremely helpful.<div><br></=
div><div>Carlos</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Wed, Sep 1, 2021 at 10:09 PM Pascal Thubert (pthube=
rt) &lt;<a href=3D"mailto:pthubert@cisco.com">pthubert@cisco.com</a>&gt; wr=
ote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px=
 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">



<div dir=3D"auto">
Hello Carlos=C2=A0
<div><br>
</div>
<div>Will do ASAP =F0=9F=98=80<br>
<br>
<div dir=3D"ltr">
<div><br>
</div>
Regards,
<div><br>
</div>
<div>Pascal</div>
</div>
<div dir=3D"ltr"><br>
<blockquote type=3D"cite">Le 1 sept. 2021 =C3=A0 20:49, CARLOS JESUS BERNAR=
DOS CANO &lt;<a href=3D"mailto:cjbc@it.uc3m.es" target=3D"_blank">cjbc@it.u=
c3m.es</a>&gt; a =C3=A9crit=C2=A0:<br>
<br>
</blockquote>
</div>
<blockquote type=3D"cite">
<div dir=3D"ltr">=EF=BB=BF
<div dir=3D"ltr">Thanks Paul for the review!
<div><br>
</div>
<div>Pascal, would it be possible for you to take a look and comment if you=
 are happy with the new version?</div>
<div><br>
</div>
<div>Thanks!</div>
<div><br>
</div>
<div>Carlos</div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Mon, Aug 30, 2021 at 3:13 PM Mr. J=
aehoon Paul Jeong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" target=3D"_=
blank">jaehoon.paul@gmail.com</a>&gt; wrote:<br>
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir=3D"ltr">Hi Pascal,
<div>Here is the revision (-21) of IPWAVE PS Draft:</div>
<div><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-veh=
icular-networking-21" target=3D"_blank">https://datatracker.ietf.org/doc/ht=
ml/draft-ietf-ipwave-vehicular-networking-21</a><br>
</div>
<div><br>
</div>
<div>I attach the revision letter to show how I have addressed your comment=
s on the revision.</div>
<div><br>
</div>
<div>Chris and I have worked for this revision together.</div>
<div><br>
</div>
<div>If you have further comments, please let me know.</div>
<div><br>
</div>
<div>Thanks.</div>
<div><br>
</div>
<div>Best Regards,</div>
<div>Paul</div>
<div><br>
</div>
<div><br>
</div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Fri, Jun 18, 2021 at 4:42 PM Pasca=
l Thubert via Datatracker &lt;<a href=3D"mailto:noreply@ietf.org" target=3D=
"_blank">noreply@ietf.org</a>&gt; wrote:<br>
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
Reviewer: Pascal Thubert<br>
Review result: Not Ready<br>
<br>
Dear authors<br>
<br>
In summary:<br>
<br>
I read a number of very good drafts collated in one, from the use cases tha=
t<br>
very complete and ready to publish, to the architecture and protocol soluti=
on<br>
in section 4 that would require more work for completeness.<br>
<br>
There are multiple instances in the use cases where protocols are listed co=
ming<br>
out of the blue, e.g., the references to OMNI that seem artificially spread=
<br>
regardless of the context of the section. OMNI is used throughout, both as =
an<br>
open ended toolbox, and as a carpet under which all problems can be hidden.=
<br>
<br>
Reading this doc, OMNI shows as an interface to a software mobile router, w=
ith<br>
multiple of the device physical interfaces connected to the mobile router. =
This<br>
makes the stack very simple as the complexity moves to the router. But now =
you<br>
have to implement the router. Presented as that, the OMNI router deserves i=
ts<br>
name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANET (=
many to<br>
choose from) and NEMO (and all the MIP protocol family across address<br>
families), all the possible radio interfaces on which the ND problems go aw=
ay<br>
by magic, and whatever else you want to put in there. Is that the intention=
?<br>
<br>
Instead of referring to OMNI for virtually anything, the doc should refer t=
o<br>
MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),<br>
draft-nordmark-intarea-ippl for split subnets, and<br>
draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet models.=
 And<br>
then you can say that all those components can be plugged in the OMNI route=
r,<br>
and you can discuss which MANET and which MIP you want, including using OMN=
I=E2=80=99s<br>
built in mobility.<br>
<br>
Note that my objections are not against the OMNI design, it might be the<br=
>
perfect thing and I am already aware of use cases that could be served by a=
<br>
P2MP interface like OMNI in conjunction with RFC8505 on the P2P subinterfac=
es<br>
(recycling the high level design we=E2=80=99ve been shipping for IPv4 / fra=
me relay for<br>
the last 30 years). My objection is of the way the draft uses [OMNI] as the=
<br>
magic wand that solves all the problems when what you really do is throw th=
em<br>
over the fence. I=E2=80=99d rather you focus on problems and use cases, for=
 which<br>
there=E2=80=99s excellent text, and indicate what needs to be done without =
making<br>
assumption on how the needful things will be solved.<br>
<br>
In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to spl=
it, keep all<br>
that=E2=80=99s use case and problem description and ship it, remove referen=
ces to<br>
protocols envisioned in the solution, and start the work on architecture of=
 the<br>
solution and the protocol applicability statements separately. An alternate=
<br>
would be to centralize the discussion on protocols to annex, and explain th=
at<br>
protocol A or B could be envisioned in solution space because to over this =
gap<br>
or implement that function.<br>
<br>
In any fashion, the current text is not ready for publication as applicabil=
ity<br>
statement, architecture and or/solution, so the related work should be remo=
ved<br>
from the main text. But I find it mostly ready for use case and problem<br>
statement, more below.<br>
<br>
Review:<br>
<br>
Abstract<br>
<br>
=C2=A0 =C2=A0This document discusses the problem statement and use cases of=
<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for Intelligent Transportation=
<br>
=C2=A0 =C2=A0Systems (ITS).<br>
<br>
&gt;&gt;&gt; The document goes beyond that; there was actually a thread at =
6MAN where<br>
Bob Hinden said =E2=80=9C This document says it is a problem statement, but=
 then<br>
becomes a solution document.=C2=A0 =C2=A0Might be better to cut it down to =
only the<br>
problem statement part. =E2=80=9C &gt;&gt;&gt; Would you consider doing thi=
s? If not, why? Note:<br>
you may want to respond on 6MAN as well. &gt;&gt;&gt; &gt;&gt;&gt;I would h=
ave thought that the<br>
traditional steps of problem statement and applicability statement of exist=
ing<br>
work could be expected from IPWAVE too. &gt;&gt;&gt; Please clarify the ste=
ps that you<br>
intend to follow next with this work.<br>
<br>
&lt;snip&gt;<br>
<br>
1.=C2=A0 Introduction<br>
<br>
&gt;&gt;&gt; Very readable and informative section, many thanks!<br>
<br>
=C2=A0 =C2=A0Along with these WAVE standards and C-V2X standards, regardles=
s of a<br>
=C2=A0 =C2=A0wireless access technology under the IP stack of a vehicle, ve=
hicular<br>
=C2=A0 =C2=A0networks can operate IP mobility with IPv6 [RFC8200] and Mobil=
e IPv6<br>
=C2=A0 =C2=A0protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (P=
MIPv6)<br>
=C2=A0 =C2=A0[RFC5213], Distributed Mobility Management (DMM) [RFC7333], Lo=
cator/<br>
=C2=A0 =C2=A0ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Ext=
ended<br>
=C2=A0 =C2=A0Route Optimization (AERO) [RFC6706BIS]).<br>
<br>
&gt;&gt;&gt; NEMO (RFC 3963) is not cited. Any reason why the vehicle would=
 not<br>
transport a network?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0This document describes use cases and a problem statement abou=
t<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for ITS, which is named IPv6 W=
ireless<br>
=C2=A0 =C2=A0Access in Vehicular Environments (IPWAVE).=C2=A0 First, it int=
roduces the<br>
=C2=A0 =C2=A0use cases for using V2V, V2I, and V2X networking in ITS.=C2=A0=
 Next, for<br>
=C2=A0 =C2=A0IPv6-based vehicular networks, it makes a gap analysis of curr=
ent<br>
=C2=A0 =C2=A0IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Manage=
ment,<br>
=C2=A0 =C2=A0and Security &amp; Privacy), and then enumerates requirements =
for the<br>
=C2=A0 =C2=A0extensions of those IPv6 protocols, which are tailored to IPv6=
-based<br>
=C2=A0 =C2=A0vehicular networking.=C2=A0 Thus, this document is intended to=
 motivate<br>
=C2=A0 =C2=A0development of key protocols for IPWAVE.<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
2.=C2=A0 Terminology<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0o=C2=A0 IP-OBU: &quot;Internet Protocol On-Board Unit&quot;: A=
n IP-OBU denotes a<br>
=C2=A0 =C2=A0 =C2=A0 computer situated in a vehicle (e.g., car, bicycle, au=
tobike,<br>
=C2=A0 =C2=A0 =C2=A0 motor cycle, and a similar one) and a device (e.g., sm=
artphone and<br>
=C2=A0 =C2=A0 =C2=A0 IoT device).=C2=A0 It has at least one IP interface th=
at runs in IEEE<br>
=C2=A0 =C2=A0 =C2=A0 802.11-OCB and has an &quot;OBU&quot; transceiver.=C2=
=A0 Also, it may have an IP<br>
=C2=A0 =C2=A0 =C2=A0 interface that runs in Cellular V2X (C-V2X) [TS-23.285=
-3GPP]<br>
=C2=A0 =C2=A0 =C2=A0 [TR-22.886-3GPP][TS-23.287-3GPP].=C2=A0 See the defini=
tion of the term<br>
=C2=A0 =C2=A0 =C2=A0 &quot;OBU&quot; in [RFC8691].<br>
<br>
&gt;&gt;&gt; Can that be a router connecting multiple computers?<br>
<br>
&lt;snip&gt;<br>
<br>
3.=C2=A0 Use Cases<br>
<br>
&gt;&gt;&gt; This is another great read and an enlightening section. Maybe =
mention in<br>
the abstract that the doc also covers use cases?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Although a Layer-2 solution can provide a support for multihop=
<br>
=C2=A0 =C2=A0communications in vehicular networks, the scalability issue re=
lated<br>
=C2=A0 =C2=A0to multihop forwarding still remains when vehicles need to<br>
=C2=A0 =C2=A0disseminate or forward packets toward multihop-away destinatio=
ns.=C2=A0 In<br>
=C2=A0 =C2=A0addition, the IPv6-based approach for V2V as a network layer p=
rotocol<br>
=C2=A0 =C2=A0can accommodate multiple radio technologies as MAC protocols, =
such as<br>
=C2=A0 =C2=A05G V2X and DSRC.=C2=A0 Therefore, the existing IPv6 protocol c=
an be<br>
=C2=A0 =C2=A0augmented through the addition of an Overlay Multilink Network=
 (OMNI)<br>
=C2=A0 =C2=A0Interface [OMNI] and/or protocol changes in order to support b=
oth<br>
=C2=A0 =C2=A0wireless single-hop/multihop V2V communications and multiple r=
adio<br>
=C2=A0 =C2=A0technologies in vehicular networks.=C2=A0 In such a way, vehic=
les can<br>
=C2=A0 =C2=A0communicate with each other by V2V communications to share eit=
her an<br>
=C2=A0 =C2=A0emergency situation or road hazard in a highway having multipl=
e kinds<br>
=C2=A0 =C2=A0of radio technologies, such as 5G V2X and DSRC.<br>
<br>
&gt;&gt;&gt; This text appears in the middle of high level use case, with a=
 crude list<br>
of protocols; this is not a place for it<br>
<br>
&gt;&gt;&gt; On a 6MAN Thread, Brian Carpenter said that the above:<br>
=E2=80=9C<br>
is of concern regardless of the mention of OMNI. Does it mean &quot;can be&=
quot; or<br>
&quot;needs to be&quot;? This paragraph seems like a very short summary of =
a big problem<br>
area. At the end of page 13 there is some related discussion, which mention=
s<br>
RPL as part of the solution (good choice, IMHO) but again seems to depend o=
n<br>
OMNI. I don&#39;t think the fix of simply removing references to OMNI works=
,<br>
because it would leave a gap. In an informational document, that is not a<b=
r>
formal problem but as far as this draft describes architecture, I don&#39;t=
 think<br>
that big a gap is reasonable. &quot;OMNI&quot; is mentioned more than 20 ti=
mes in the<br>
document. There are also several references to AERO, which is strongly<br>
associated with OMNI. =E2=80=9C &gt;&gt;&gt; I agree with Brian. Here the d=
ocument seems to be<br>
mixing solution with problem and putting the cart before the horse. My<br>
recommendation is to stick to what needs to be done that IPv6 does not do y=
et<br>
-the reqs and gaps-; but the doc should not step in the how things will be =
done<br>
unless the group already decided to do it. The logical next steps to a PS a=
re<br>
an applicability statement of existing work, and if the gaps cannot be fill=
ed,<br>
there may be one or more WG chartered to fill those gaps.<br>
<br>
&gt;&gt;&gt; I=E2=80=99d still be happy to see an annex with leads on where=
 the solution might<br>
come from like RFC 8691 does.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2I communications in a highway where RSUs a=
re<br>
=C2=A0 =C2=A0sparsely deployed, so a vehicle can reach the wireless coverag=
e of an<br>
=C2=A0 =C2=A0RSU through the multihop data forwarding of intermediate vehic=
les.<br>
=C2=A0 =C2=A0Thus, IPv6 needs to be extended for multihop V2I communication=
s.<br>
<br>
&gt;&gt;&gt; Note that I have no clue on how well OMNI applies in that spac=
e, maybe it<br>
does very well; but here it comes out of the blue with no justification. If=
 you<br>
mention OMNI you need to detail what it is and which of the V2V=C2=A0 probl=
ems you<br>
expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2X (or V2I2X) communications in an urban ro=
ad<br>
=C2=A0 =C2=A0network where RSUs are deployed at intersections, so a vehicle=
 (or a<br>
=C2=A0 =C2=A0pedestrian&#39;s smartphone) can reach the wireless coverage o=
f an RSU<br>
=C2=A0 =C2=A0through the multihop data forwarding of intermediate vehicles =
(or<br>
=C2=A0 =C2=A0pedestrians&#39; smartphones).=C2=A0 Thus, IPv6 needs to be ex=
tended for<br>
=C2=A0 =C2=A0multihop V2X (or V2I2X) communications.<br>
<br>
&gt;&gt;&gt; Please be more specific on what the missing functions are and =
whether they<br>
are missing from the stack development standpoint or if there=E2=80=99s wor=
k needed<br>
from the IETF. 1)=C2=A0 =C2=A0 =C2=A0 If something is really missing in our=
 specs, the text to<br>
prove from the use case above is missing 2)=C2=A0 =C2=A0 =C2=A0 how OMNI se=
rves the use case<br>
could be elaborated in an applicability statement of OMNI for V2xyz, but it=
 is<br>
a bit blunt to present it as panacea when the problems to be solved are not=
<br>
listed. 3)=C2=A0 =C2=A0 =C2=A0 If you look at it, OMNI seems like a softwar=
e mobile router<br>
within a bump in the stack. Can that become too big?<br>
<br>
&gt;&gt;&gt; my view is that the text above and the similar occasions shoul=
d be replaced<br>
by something like :<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented to provide the fo=
llowing<br>
=C2=A0 =C2=A0functions: 1) =E2=80=A6<br>
<br>
&gt;&gt;&gt; and / or something like:<br>
<br>
=C2=A0 =C2=A0In addition to the IPv6 node requirements [RFC 8504], the IPv6=
 protocol<br>
=C2=A0 =C2=A0stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=
=A6<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To support applications of these V2X use cases, the functions =
of IPv6<br>
=C2=A0 =C2=A0such as VND, VMM, and VSP are prerequisites for IPv6-based pac=
ket<br>
=C2=A0 =C2=A0exchange, transport-layer session continuity, and secure, safe=
<br>
=C2=A0 =C2=A0communication between a vehicle and a pedestrian either direct=
ly or<br>
=C2=A0 =C2=A0indirectly via an IP-RSU.<br>
<br>
&gt;&gt;&gt; =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=
=9D does not parse. There=E2=80=99s<br>
no IPv6 reference that provides those functions. If the intention is to say=
<br>
that there=E2=80=99s stuff to add to IPv6 to support, like, say,=C2=A0 VND,=
 then this<br>
document fails to define how an IPv6 VND should behave, though it=E2=80=99s=
 precisely<br>
what I=E2=80=99d expect from a problem statement.<br>
<br>
&lt;snip&gt;<br>
<br>
4.=C2=A0 Vehicular Networks<br>
<br>
&gt;&gt;&gt; What is the purpose of section 4 as a whole, problem statement=
 or<br>
applicability statement of the listed protocols? In the former case what=E2=
=80=99s the<br>
problem? In the latter case it is incomplete and needs to be exported to an=
<br>
applicability statement doc with all the possible technologies evaluated.<b=
r>
<br>
=C2=A0 =C2=A0This section describes an example vehicular network architectu=
re<br>
=C2=A0 =C2=A0supporting V2V, V2I, and V2X communications in vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt; I read this as presenting a context to explain what the proble=
ms are<br>
instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe usin=
g the term<br>
=E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=99s =
comment.<br>
<br>
&lt;snip&gt;<br>
<br>
4.1.=C2=A0 Vehicular Network Architecture<br>
<br>
=C2=A0 =C2=A0Figure 1 shows an example vehicular network architecture for V=
2I and<br>
=C2=A0 =C2=A0V2V in a road network [OMNI].<br>
<br>
a.=C2=A0 =C2=A0 =C2=A0 Is using OMNI a decision that the WG made for the fu=
ture work ? what<br>
does it do and what does it not do? b.=C2=A0 =C2=A0 =C2=A0 Is there work le=
ft to be done? Who<br>
will do that work? Or is it the expectation that OMNI has it all defined<br=
>
already?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An existing network architecture (e.g., an IP-based aeronautic=
al<br>
=C2=A0 =C2=A0network architecture [OMNI][UAM-ITS], a network architecture o=
f<br>
=C2=A0 =C2=A0PMIPv6 [RFC5213], and a low-power and lossy network architectu=
re<br>
=C2=A0 =C2=A0[RFC6550]) can be extended to a vehicular network architecture=
 for<br>
=C2=A0 =C2=A0multihop V2V, V2I, and V2X, as shown in Figure 1.=C2=A0 In a h=
ighway<br>
=C2=A0 =C2=A0scenario, a vehicle may not access an RSU directly because of =
the<br>
=C2=A0 =C2=A0distance of the DSRC coverage (up to 1 km).=C2=A0 For example,=
 the OMNI<br>
=C2=A0 =C2=A0interface and/or RPL (IPv6 Routing Protocol for Low-Power and =
Lossy<br>
=C2=A0 =C2=A0Networks) [RFC6550] can be extended to support a multihop V2I =
since a<br>
=C2=A0 =C2=A0vehicle can take advantage of other vehicles as relay nodes to=
 reach<br>
=C2=A0 =C2=A0the RSU.=C2=A0 Also, RPL can be extended to support both multi=
hop V2V and<br>
=C2=A0 =C2=A0V2X in the similar way.<br>
<br>
&gt;&gt;&gt; all this could fit well in annex; anyway you need to explain w=
hat you<br>
expect the protocols to do and which extension is needed. In the case of RP=
L at<br>
least you indicate that it would do routing, but not why you cannot use it =
of<br>
the shelf; for OMNI, what you expect is less clear, though there=E2=80=99s =
text<br>
elsewhere about the many radio interfaces that could be used for the purpos=
e,<br>
and the text in the UAM below that is enlightening.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 To support not only the mobil=
ity<br>
=C2=A0 =C2=A0management of the UAM end systems, but also the multihop and<b=
r>
=C2=A0 =C2=A0multilink communications of the UAM interfaces, the UAM end sy=
stems<br>
=C2=A0 =C2=A0can employ an Overlay Multilink Network (OMNI) interface [OMNI=
] as a<br>
=C2=A0 =C2=A0virtual Non-Broadcast Multiple Access (NBMA) connection to a s=
erving<br>
=C2=A0 =C2=A0ground domain infrastructure.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; when connecting to a MANET it needs support for that MANET. The t=
ext<br>
above seems to imply that is solves everything in V2xyz like magic; reminds=
 me<br>
of the IPv6 multicast abstraction that was supposed to solve the broadcast<=
br>
problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 This infrastructure can be configured<br>
=C2=A0 =C2=A0over the underlying data links.=C2=A0 The OMNI interface and i=
ts link<br>
=C2=A0 =C2=A0model provide a means of multilink, multihop and mobility<br>
=C2=A0 =C2=A0coordination to the legacy IPv6 ND messaging [RFC4861] accordi=
ng to<br>
=C2=A0 =C2=A0the NBMA principle.=C2=A0 Thus, the OMNI link model can suppor=
t efficient<br>
=C2=A0 =C2=A0UAM internetworking services without additional mobility messa=
ging,<br>
=C2=A0 =C2=A0and without any modification to the IPv6 ND messaging services=
 or<br>
=C2=A0 =C2=A0link model.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; the text above seems to imply that is solves everything in V2xyz =
like<br>
magic; that would be a stretch, that reminds me of IPv6 multicast that was<=
br>
supposed to solve the broadcast problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Multiple vehicles under the coverage of an RSU share a prefix =
just as<br>
=C2=A0 =C2=A0mobile nodes share a prefix of a Wi-Fi access point in a wirel=
ess<br>
=C2=A0 =C2=A0LAN.=C2=A0 This is a natural characteristic in infrastructure-=
based<br>
=C2=A0 =C2=A0wireless networks.=C2=A0 For example, in Figure 1, two vehicle=
s (i.e.,<br>
=C2=A0 =C2=A0Vehicle2, and Vehicle5) can use Prefix 1 to configure their IP=
v6<br>
=C2=A0 =C2=A0global addresses for V2I communication.=C2=A0 Alternatively, m=
obile nodes<br>
=C2=A0 =C2=A0can employ an OMNI interface and use their own IPv6 Unique Loc=
al<br>
=C2=A0 =C2=A0Addresses (ULAs) [RFC4193] over the wireless network without<b=
r>
=C2=A0 =C2=A0requiring the messaging of IPv6 Stateless Address Autoconfigur=
ation<br>
=C2=A0 (SLAAC) [RFC4862], which uses an on-link prefix provided by the<br>
=C2=A0 =C2=A0(visited) wireless LAN; this technique is known as &quot;Bring=
-Your-Own-<br>
=C2=A0 =C2=A0Addresses&quot;.<br>
<br>
&gt;&gt;&gt;=C2=A0 Is OMNI the only way to &quot;Bring-Your-Own-Addresses=
=E2=80=9D? Else the text could be<br>
more generic, at least use e.g., like the ref to AERO later. &gt;&gt;&gt; W=
hat are the<br>
implications / limitations of doing that =E2=80=93 like they can do line of=
 sight V2V<br>
but not reach the internet, or the need of=C2=A0 a local MANET / RPL that w=
ill<br>
accept to route those addresses, or the security / address ownership valida=
tion<br>
issues ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0A single subnet prefix announced by an RSU can span multiple v=
ehicles<br>
=C2=A0 =C2=A0in VANET.=C2=A0 For example, in Figure 1, for Prefix 1, three =
vehicles<br>
=C2=A0 =C2=A0(i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a conne=
cted<br>
=C2=A0 =C2=A0VANET.=C2=A0 Also, for Prefix 2, two vehicles (i.e., Vehicle3 =
and<br>
=C2=A0 =C2=A0Vehicle6) can construct another connected VANET, and for Prefi=
x 3,<br>
=C2=A0 =C2=A0two vehicles (i.e., Vehicle4 and Vehicle7) can construct anoth=
er<br>
=C2=A0 =C2=A0connected VANET.=C2=A0 Alternatively, each vehicle could emplo=
y an OMNI<br>
=C2=A0 =C2=A0interface with their own ULAs such that no topologically-orien=
ted<br>
=C2=A0 =C2=A0subnet prefixes need be announced by the RSU.<br>
<br>
&gt;&gt;&gt;=C2=A0 same as above. This seems to restate the same thing, der=
ive an address<br>
from a topologically correct prefix or use your own with limitations to be<=
br>
described.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]<b=
r>
=C2=A0 =C2=A0specifies several details, including Maximum Transmission Unit=
 (MTU),<br>
=C2=A0 =C2=A0frame format, link-local address, address mapping for unicast =
and<br>
=C2=A0 =C2=A0multicast, stateless autoconfiguration, and subnet structure.=
=C2=A0 An<br>
=C2=A0 =C2=A0Ethernet Adaptation (EA) layer is in charge of transforming so=
me<br>
=C2=A0 =C2=A0parameters between the IEEE 802.11 MAC layer and the IPv6 netw=
ork<br>
=C2=A0 =C2=A0layer, which is located between the IEEE 802.11-OCB&#39;s logi=
cal link<br>
=C2=A0 =C2=A0control layer and the IPv6 network layer.=C2=A0 This IPv6 over=
 802.11-OCB<br>
=C2=A0 =C2=A0can be used for both V2V and V2I in IPv6-based vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt;=C2=A0 solution space.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An IPv6 mobility solution is needed for the guarantee of<br>
=C2=A0 =C2=A0communication continuity in vehicular networks so that a vehic=
le&#39;s<br>
=C2=A0 =C2=A0TCP session can be continued, or UDP packets can be delivered =
to a<br>
=C2=A0 =C2=A0vehicle as a destination without loss while it moves from an I=
P-RSU&#39;s<br>
=C2=A0 =C2=A0wireless coverage to another IP-RSU&#39;s wireless coverage.=
=C2=A0 In<br>
=C2=A0 =C2=A0Figure 1, assuming that Vehicle2 has a TCP session (or a UDP s=
ession)<br>
=C2=A0 =C2=A0with a corresponding node in the vehicular cloud, Vehicle2 can=
 move<br>
=C2=A0 =C2=A0from IP-RSU1&#39;s wireless coverage to IP-RSU2&#39;s wireless=
 coverage.=C2=A0 In<br>
=C2=A0 =C2=A0this case, a handover for Vehicle2 needs to be performed by ei=
ther a<br>
=C2=A0 =C2=A0host-based mobility management scheme (e.g., MIPv6 [RFC6275]) =
or a<br>
=C2=A0 =C2=A0network-based mobility management scheme (e.g., PMIPv6 [RFC521=
3] and<br>
=C2=A0 =C2=A0AERO [RFC6706BIS]).<br>
<br>
=C2=A0 =C2=A0In the host-based mobility scheme (e.g., MIPv6), an IP-RSU pla=
ys a<br>
=C2=A0 =C2=A0role of a home agent.=C2=A0 On the other hand, in the network-=
based<br>
=C2=A0 =C2=A0mobility scheme (e.g., PMIPv6, an MA plays a role of a mobilit=
y<br>
=C2=A0 =C2=A0management controller such as a Local Mobility Anchor (LMA) in=
<br>
=C2=A0 =C2=A0PMIPv6, which also serves vehicles as a home agent, and an IP-=
RSU<br>
=C2=A0 =C2=A0plays a role of an access router such as a Mobile Access Gatew=
ay<br>
=C2=A0 =C2=A0(MAG) in PMIPv6 [RFC5213].=C2=A0 The host-based mobility schem=
e needs<br>
=C2=A0 =C2=A0client functionality in IPv6 stack of a vehicle as a mobile no=
de for<br>
=C2=A0 =C2=A0mobility signaling message exchange between the vehicle and ho=
me<br>
=C2=A0 =C2=A0agent.=C2=A0 On the other hand, the network-based mobility sch=
eme does not<br>
=C2=A0 =C2=A0need such a client functionality for a vehicle because the net=
work<br>
=C2=A0 =C2=A0infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility =
agent<br>
=C2=A0 =C2=A0handles the mobility signaling message exchange with the home =
agent<br>
=C2=A0 =C2=A0(e.g., LMA in PMIPv6) for the sake of the vehicle.<br>
<br>
=C2=A0 =C2=A0There are a scalability issue and a route optimization issue i=
n the<br>
=C2=A0 =C2=A0network-based mobility scheme (e.g., PMIPv6) when an MA covers=
 a<br>
=C2=A0 =C2=A0large vehicular network governing many IP-RSUs.=C2=A0 In this =
case, a<br>
=C2=A0 =C2=A0distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate=
 the<br>
=C2=A0 =C2=A0scalability issue by distributing multiple MAs in the vehicula=
r<br>
=C2=A0 =C2=A0network such that they are positioned closer to vehicles for r=
oute<br>
=C2=A0 =C2=A0optimization and bottleneck mitigation in a central MA in the<=
br>
=C2=A0 =C2=A0network-based mobility scheme.=C2=A0 All these mobility approa=
ches (i.e.,<br>
=C2=A0 =C2=A0a host-based mobility scheme, network-based mobility scheme, a=
nd<br>
=C2=A0 =C2=A0distributed mobility scheme) and a hybrid approach of a combin=
ation<br>
=C2=A0 =C2=A0of them need to provide an efficient mobility service to vehic=
les<br>
=C2=A0 =C2=A0moving fast and moving along with the relatively predictable<b=
r>
=C2=A0 =C2=A0trajectories along the roadways.<br>
<br>
=C2=A0 =C2=A0In vehicular networks, the control plane can be separated from=
 the<br>
=C2=A0 =C2=A0data plane for efficient mobility management and data forwardi=
ng by<br>
=C2=A0 =C2=A0using the concept of Software-Defined Networking (SDN)<br>
=C2=A0 =C2=A0[RFC7149][DMM-FPC].=C2=A0 Note that Forwarding Policy Configur=
ation (FPC)<br>
=C2=A0 =C2=A0in [DMM-FPC], which is a flexible mobility management system, =
can<br>
=C2=A0 =C2=A0manage the separation of data-plane and control-plane in DMM.=
=C2=A0 In<br>
=C2=A0 =C2=A0SDN, the control plane and data plane are separated for the ef=
ficient<br>
=C2=A0 =C2=A0management of forwarding elements (e.g., switches and routers)=
 where<br>
=C2=A0 =C2=A0an SDN controller configures the forwarding elements in a cent=
ralized<br>
=C2=A0 =C2=A0way and they perform packet forwarding according to their forw=
arding<br>
=C2=A0 =C2=A0tables that are configured by the SDN controller.=C2=A0 An MA =
as an SDN<br>
=C2=A0 =C2=A0controller needs to efficiently configure and monitor its IP-R=
SUs and<br>
=C2=A0 =C2=A0vehicles for mobility management, location management, and sec=
urity<br>
=C2=A0 =C2=A0services.<br>
<br>
=C2=A0 =C2=A0The mobility information of a GPS receiver mounted in its vehi=
cle<br>
=C2=A0 =C2=A0(e.g., position, speed, and direction) can be used to accommod=
ate<br>
=C2=A0 =C2=A0mobility-aware proactive handover schemes, which can perform t=
he<br>
=C2=A0 =C2=A0handover of a vehicle according to its mobility and the wirele=
ss<br>
=C2=A0 =C2=A0signal strength of a vehicle and an IP-RSU in a proactive way.=
<br>
<br>
=C2=A0 =C2=A0Vehicles can use the TCC as their Home Network having a home a=
gent<br>
=C2=A0 =C2=A0for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5=
213],<br>
=C2=A0 =C2=A0so the TCC (or an MA inside the TCC) maintains the mobility<br=
>
=C2=A0 =C2=A0information of vehicles for location management.=C2=A0 IP tunn=
eling over<br>
=C2=A0 =C2=A0the wireless link should be avoided for performance efficiency=
.<br>
=C2=A0 =C2=A0Also, in vehicular networks, asymmetric links sometimes exist =
and<br>
=C2=A0 =C2=A0must be considered for wireless communications such as V2V and=
 V2I.<br>
<br>
&gt;&gt;&gt;=C2=A0 This is all very informative text but does not state a p=
roblem. Is there a<br>
problem is left to be solved or are we assessing the applicability of<br>
protocols? Could it for instance, forward point to issues discussed in sect=
ion<br>
5?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, as internal networks, a vehicle&#39;s mo=
ving<br>
=C2=A0 =C2=A0network and an EN&#39;s fixed network are self-contained netwo=
rks having<br>
=C2=A0 =C2=A0multiple subnets and having an edge router (e.g., IP-OBU and I=
P-RSU)<br>
=C2=A0 =C2=A0for the communication with another vehicle or another EN.=C2=
=A0 The<br>
=C2=A0 =C2=A0internetworking between two internal networks via V2I communic=
ation<br>
=C2=A0 =C2=A0requires the exchange of the network parameters and the networ=
k<br>
=C2=A0 =C2=A0prefixes of the internal networks.=C2=A0 For the efficiency, t=
he network<br>
=C2=A0 =C2=A0prefixes of the internal networks (as a moving network) in a v=
ehicle<br>
=C2=A0 =C2=A0need to be delegated and configured automatically.=C2=A0 Note =
that a<br>
=C2=A0 =C2=A0moving network&#39;s network prefix can be called a Mobile Net=
work Prefix<br>
=C2=A0 =C2=A0(MNP) [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. MNP is originally =
defined here<br>
<a href=3D"https://datatracker.ietf.org/doc/html/rfc3963#section-2" rel=3D"=
noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/html/rfc3963=
#section-2</a> and that=E2=80=99s a reference<br>
you can use normatively.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, the addresses used for IPv6 transmission=
s over<br>
=C2=A0 =C2=A0the wireless link interfaces for IP-OBU and IP-RSU can be eith=
er<br>
=C2=A0 =C2=A0global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets ca=
n be<br>
=C2=A0 =C2=A0routed within vehicular networks [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. There needs to=C2=
=A0 be a routing protocol<br>
like a MANET that will accept to carry the<br>
=C2=A0MNPs, and that must be implemented by the infra and both cars. The OM=
NI spec<br>
=C2=A0is clear on that. This is why at first glance I see OMNI as a full mo=
bile<br>
=C2=A0router in a bump in the stack. Now what is the problem behind this? N=
o such<br>
=C2=A0protocol at IETF? Too many to choose from? No deployment?<br>
&lt;snip&gt;<br>
<br>
When global IPv6 addresses<br>
=C2=A0 =C2=A0are used, wireless interface configuration and control overhea=
d for<br>
=C2=A0 =C2=A0Duplicate Address Detection (DAD) [RFC4862] and Multicast List=
ener<br>
=C2=A0 =C2=A0Discovery (MLD) [RFC2710][RFC3810] should be minimized to supp=
ort V2I<br>
=C2=A0 =C2=A0and V2X communications for vehicles moving fast along roadways=
; when<br>
=C2=A0 =C2=A0ULAs and the OMNI interface are used, no DAD nor MLD messaging=
 is<br>
=C2=A0 =C2=A0needed.<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it t=
he no dad needed a property<br>
of injecting a BYOA in the fabric for an GUA MIP Home Address which is know=
n to<br>
be unique at home? &gt;&gt;&gt; OTOH, autoconf=E2=80=99ing a random ULA =E2=
=80=9CFD=E2=80=A6=E2=80=9Dprefix has lesser<br>
DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classical =
subnet. So<br>
who says DAD isn=E2=80=99t required for OMNI ULA? &gt;&gt;&gt; note that IM=
HO DAD on wireless is<br>
a lot more harm than good, and I agree that with a good pseudo random gener=
ator<br>
the ULA has no chance to collision in the real world, as OMNI claims. It=E2=
=80=99s just<br>
that your argument here plays the other way, because there are less random =
bits<br>
(56)=C2=A0 in the ULA prefix than in the IID (62), and if one starts using =
more<br>
prefix bits to be non-random, there will be a time when DAD on prefix is ne=
eded.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Let us consider the upload/download time of a vehicle when it =
passes<br>
=C2=A0 =C2=A0through the wireless communication coverage of an IP-RSU.=C2=
=A0 For a<br>
=C2=A0 =C2=A0given typical setting where 1km is the maximum DSRC communicat=
ion<br>
=C2=A0 =C2=A0range [DSRC] and 100km/h is the speed limit in highway, the dw=
elling<br>
=C2=A0 =C2=A0time can be calculated to be 72 seconds by dividing the diamet=
er of<br>
=C2=A0 =C2=A0the 2km (i.e., two times of DSRC communication range where an =
IP-RSU<br>
=C2=A0 =C2=A0is located in the center of the circle of wireless communicati=
on) by<br>
=C2=A0 =C2=A0the speed limit of 100km/h (i.e., about 28m/s).=C2=A0 For the =
72 seconds,<br>
=C2=A0 =C2=A0a vehicle passing through the coverage of an IP-RSU can upload=
 and<br>
=C2=A0 =C2=A0download data packets to/from the IP-RSU.<br>
<br>
&lt;snip&gt;<br>
<br>
4.3.=C2=A0 V2V-based Internetworking<br>
<br>
&gt;&gt;&gt; In this section it looks like the cars are in a stable line of=
 sight<br>
relationship. Which is probably fine for a platoon, but when you drive alon=
g<br>
with friends in different cars, you realize that the line of sight assumpti=
on<br>
does not stand over time. Soon enough, other cars meddle in, and possibly o=
ne<br>
of the cars drives faster and too far ahead so you need the infra to relay,=
<br>
possibly over multiple infra hops.<br>
<br>
&gt;&gt;&gt; so in this section, I=E2=80=99d expect to see a Vehicle commun=
icating with another<br>
one and using either line of sight or V2V relaying but also using relay via=
 V2I<br>
(multihop I2I not just hub and spoke V2I2V ), alternatively to together for=
<br>
redundancy. Is that part of the problem?<br>
<br>
&gt;&gt;&gt; reading deeper section 5 I found excellent text on routing via=
 V and via I.<br>
This tells that section 4 does not play a good role at justifying section 5=
.<br>
Maybe keep section 4 for another doc?<br>
<br>
&gt;&gt;&gt; What kind or reliability is required in a V2V use case? Do you=
 think ND can<br>
handle it? Or MANET? What would be the assumption on L2 (roaming time, unic=
ast<br>
vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3 <br=
>
redundancy?<br>
<br>
&lt;snip&gt;<br>
<br>
5.=C2=A0 Problem Statement<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0In order to specify protocols using the architecture mentioned=
 in<br>
=C2=A0 =C2=A0Section 4.1, IPv6 core protocols have to be adapted to overcom=
e<br>
=C2=A0 =C2=A0certain challenging aspects of vehicular networking.=C2=A0 Sin=
ce the<br>
=C2=A0 =C2=A0vehicles are likely to be moving at great speed, protocol exch=
anges<br>
=C2=A0 =C2=A0need to be completed in a time relatively short compared to th=
e<br>
=C2=A0 =C2=A0lifetime of a link between a vehicle and an IP-RSU, or between=
 two<br>
=C2=A0 =C2=A0vehicles.<br>
<br>
&gt;&gt;&gt; Any order of magnitude?<br>
&gt;&gt;&gt; Can you indicate whether this already rules out certain proced=
ures, e.g.<br>
DAD ?<br>
<br>
=C2=A0 =C2=A0The lifetime of a session varies depending on the session&#39;=
s type such<br>
=C2=A0 =C2=A0as a web surfing, voice call over IP, and DNS query.=C2=A0 Reg=
ardless of a<br>
=C2=A0 =C2=A0session&#39;s type, to guide all the IPv6 packets to their des=
tination<br>
=C2=A0 =C2=A0host, IP mobility should be supported for the session.<br>
<br>
&gt;&gt;&gt; this seems to be for unicast when you know who to talk to. Is =
there a need<br>
some multicast groups like anybody around interested in topic blah like I c=
ould<br>
be multicasting the speed of vehicles coming the other way that I crossed<b=
r>
recently, for use of vehicles that I=E2=80=99m crossing now, so they can se=
e a slowdown<br>
on advance<br>
<br>
=C2=A0 =C2=A0Thus, the time constraint of a wireless link has a major impac=
t on<br>
=C2=A0 =C2=A0IPv6 Neighbor Discovery (ND).=C2=A0 Mobility Management (MM) i=
s also<br>
=C2=A0 =C2=A0vulnerable to disconnections that occur before the completion =
of<br>
=C2=A0 =C2=A0identity verification and tunnel management.=C2=A0 This is esp=
ecially true<br>
=C2=A0 =C2=A0given the unreliable nature of wireless communication.=C2=A0 T=
his section<br>
=C2=A0 =C2=A0presents key topics such as neighbor discovery and mobility<br=
>
=C2=A0 =C2=A0management.<br>
<br>
&gt;&gt;&gt; Only ND? What about the MANET?<br>
&gt;&gt;&gt; how fast should ND be to be suitable?<br>
&gt;&gt;&gt; is there also a bandwidth check? You can make things much fast=
er if you<br>
dedicate a lot of spectrum to it. But that can also be a waste.<br>
<br>
5.1.=C2=A0 Neighbor Discovery<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The requirements for IPv6 ND for vehicular networks are effici=
ent DAD<br>
=C2=A0 =C2=A0and NUD operations.<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 This merging and partitioning should be considered for=
 the<br>
=C2=A0 =C2=A0IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAA=
C)<br>
=C2=A0 =C2=A0[RFC4862].<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Also, the partitioning of a VANET may make vehicles with the s=
ame<br>
=C2=A0 =C2=A0prefix be physically unreachable.=C2=A0 Also, SLAAC needs to p=
revent IPv6<br>
=C2=A0 =C2=A0address duplication due to the merging of VANETs.=C2=A0 Accord=
ing to the<br>
=C2=A0 =C2=A0merging and partitioning, a destination vehicle (as an IPv6 ho=
st)<br>
=C2=A0 =C2=A0needs to be distinguished as either an on-link host or an off-=
link<br>
=C2=A0 =C2=A0host even though the source vehicle uses the same prefix as th=
e<br>
=C2=A0 =C2=A0destination vehicle.<br>
<br>
&gt;&gt;&gt; should reference to draft-nordmark-intarea-ippl<br>
<br>
=C2=A0 =C2=A0To efficiently prevent IPv6 address duplication due to the VAN=
ET<br>
=C2=A0 =C2=A0partitioning and merging from happening in vehicular networks,=
 the<br>
=C2=A0 =C2=A0vehicular networks need to support a vehicular-network-wide DA=
D by<br>
=C2=A0 =C2=A0defining a scope that is compatible with the legacy DAD.=C2=A0=
 In this<br>
=C2=A0 =C2=A0case, two vehicles can communicate with each other when there =
exists<br>
=C2=A0 =C2=A0a communication path over VANET or a combination of VANETs and=
 IP-<br>
=C2=A0 =C2=A0RSUs, as shown in Figure 1.=C2=A0 By using the vehicular-netwo=
rk-wide DAD,<br>
=C2=A0 =C2=A0vehicles can assure that their IPv6 addresses are unique in th=
e<br>
=C2=A0 =C2=A0vehicular network whenever they are connected to the vehicular=
<br>
=C2=A0 =C2=A0infrastructure or become disconnected from it in the form of V=
ANET.<br>
<br>
&gt;&gt;&gt; Excellent<br>
<br>
=C2=A0 =C2=A0ND time-related parameters such as router lifetime and Neighbo=
r<br>
=C2=A0 =C2=A0Advertisement (NA) interval need to be adjusted for vehicle sp=
eed and<br>
=C2=A0 =C2=A0vehicle density.=C2=A0 For example, the NA interval needs to b=
e<br>
=C2=A0 =C2=A0dynamically adjusted according to a vehicle&#39;s speed so tha=
t the<br>
=C2=A0 =C2=A0vehicle can maintain its neighboring vehicles in a stable way,=
<br>
=C2=A0 =C2=A0considering the collision probability with the NA messages sen=
t by<br>
=C2=A0 =C2=A0other vehicles.<br>
<br>
&gt;&gt;&gt; Is that a problem or just an operational setting that needs to=
 be found?<br>
&gt;&gt;&gt; Do we need to reconsider the concepts of those timers?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, IPv6 ND should have =
minimum<br>
=C2=A0 =C2=A0changes for the interoperability with the legacy IPv6 ND used =
in the<br>
=C2=A0 =C2=A0Internet, including the DAD and NUD operations.<br>
<br>
&gt;&gt;&gt; I do not find the logical link with the text before, why is th=
is a =E2=80=9Cthus=E2=80=9D?<br>
&gt;&gt;&gt; why should the ND inside the VANET be constrained to be intero=
perable? This<br>
may place constraints on the solution.<br>
<br>
5.1.1.=C2=A0 Link Model<br>
<br>
=C2=A0 =C2=A0A prefix model for a vehicular network needs to facilitate the=
<br>
<br>
&gt;&gt;&gt; Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=
=80=9Cprefix model=E2=80=9D.<br>
&gt;&gt;&gt; it would make this piece and the next should refer to<br>
draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both li=
nk<br>
and subnet issues. The general ideas are the same, but the gory details her=
e<br>
are slightly incorrect, like this notion of prefix model than comes out of =
the<br>
blue. The model is really the subnet model for the subnet associated to P2M=
P.<br>
<br>
=C2=A0 =C2=A0communication between two vehicles with the same prefix regard=
less of<br>
=C2=A0 =C2=A0the vehicular network topology as long as there exist bidirect=
ional<br>
=C2=A0 =C2=A0E2E paths between them in the vehicular network including VANE=
Ts and<br>
=C2=A0 =C2=A0IP-RSUs.=C2=A0 This prefix model allows vehicles with the same=
 prefix to<br>
=C2=A0 =C2=A0communicate with each other via a combination of multihop V2V =
and<br>
=C2=A0 =C2=A0multihop V2I with VANETs and IP-RSUs.=C2=A0 Note that the OMNI=
 interface<br>
=C2=A0 =C2=A0supports an NBMA link model where multihop V2V and V2I communi=
cations<br>
=C2=A0 =C2=A0use each mobile node&#39;s ULAs without need for any DAD or ML=
D<br>
=C2=A0 =C2=A0messaging.<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; I kinda agree about the OMNI interface model, nothing against =
that. But you<br>
must see that there needs a lot more than what the OMNI interface to get<br=
>
packets across V and I hops to the destination. Like routing ala MANET,<br>
redundancy handling ala DetNet because it will be very lossy, path manageme=
nt<br>
ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND so i=
t does not<br>
solve the ND problems above.<br>
<br>
=C2=A0 =C2=A0IPv6 protocols work under certain assumptions that do not nece=
ssarily<br>
=C2=A0 =C2=A0hold for vehicular wireless access link types other than OMNI/=
NBMA<br>
=C2=A0 =C2=A0[VIP-WAVE][RFC5889]; the rest of this section discusses implic=
ations<br>
=C2=A0 =C2=A0for those link types that do not apply when the OMNI/NBMA link=
 model<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; The keyword here is P2MP / NBMA, and OMNI is one interface tha=
t accepts<br>
that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already P2M=
P / NBMA,<br>
using routing to complete the partial mesh in P2MP. The text seems to imply=
<br>
that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI is=
 loaded with<br>
other stuff than a plain P2MP capable interface. And ND over P2MP is not do=
ne<br>
by OMNI, OMNI only makes classical ND worse and only works in a full mesh. =
OTOH<br>
RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work very =
well<br>
within an OMNI interface and solve those problems. &gt;&gt;&gt; My point is=
 that you<br>
need to tell the full story or refrain from entering solution space in this=
 doc<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0There is a relationship between a link and a prefix, besides t=
he<br>
=C2=A0 =C2=A0different scopes that are expected from the link-local and glo=
bal<br>
=C2=A0 =C2=A0types of IPv6 addresses.=C2=A0 In an IPv6 link, it is assumed =
that all<br>
=C2=A0 =C2=A0interfaces which are configured with the same subnet prefix an=
d with<br>
=C2=A0 =C2=A0on-link bit set can communicate with each other on an IPv6 lin=
k.<br>
<br>
&gt;&gt;&gt; not assumed; that=E2=80=99s what the onlink but set tells. The=
 conclusion should be<br>
that the VANET cannot set the O bit.<br>
<br>
=C2=A0 =C2=A0However, the vehicular link model needs to define the relation=
ship<br>
=C2=A0 =C2=A0between a link and a prefix, considering the dynamics of wirel=
ess<br>
=C2=A0 =C2=A0links and the characteristics of VANET.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0From the previous observation, a vehicular link model should c=
onsider<br>
=C2=A0 =C2=A0the frequent partitioning and merging of VANETs due to vehicle=
<br>
=C2=A0 =C2=A0mobility.=C2=A0 Therefore, the vehicular link model needs to u=
se an on-<br>
=C2=A0 =C2=A0link prefix and off-link prefix according to the network topol=
ogy of<br>
=C2=A0 =C2=A0vehicles such as a one-hop reachable network and a multihop re=
achable<br>
<br>
&gt;&gt;&gt; No, the once a node saw a O bit set that sticks even if it see=
s other<br>
advertisements of the PIO with the O bit not set. &gt;&gt;&gt; This is a gl=
obal and<br>
intrinsic property of the prefix (and an attack vector that could be mentio=
ned<br>
in the sec section). &gt;&gt;&gt; the VANET prefix must never come with the=
 O bit set.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0network (or partitioned networks).=C2=A0 If the vehicles with =
the same<br>
=C2=A0 =C2=A0prefix are reachable from each other in one hop, the prefix sh=
ould be<br>
=C2=A0 =C2=A0on-link.<br>
<br>
&gt;&gt;&gt;&gt; No, see above; but the router may redirect though it is re=
ally risky<br>
unless this is a stable situation like a parking place.<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, the vehicular link m=
odel<br>
=C2=A0 =C2=A0should have minimum changes for interoperability with standard=
 IPv6<br>
=C2=A0 =C2=A0links in an efficient fashion to support IPv6 DAD, MLD and NUD=
<br>
=C2=A0 =C2=A0operations.=C2=A0 When the OMNI NBMA link model is used, there=
 are no link<br>
=C2=A0 =C2=A0model changes nor DAD/MLD messaging required.<br>
<br>
&gt;&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt;&gt; You need a good P2MP subnet model with routing support whe=
n the mesh is<br>
partial. My company alone has been shipping million of nodes that build sub=
nets<br>
of thousands, and that was done using IETF standards.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For vehicular networks with high mobility and density, the DAD=
 needs<br>
=C2=A0 =C2=A0to be performed efficiently with minimum overhead so that the<=
br>
=C2=A0 =C2=A0vehicles can exchange a driving safety message (e.g., collisio=
n<br>
=C2=A0 =C2=A0avoidance and accident notification) with each other with a sh=
ort<br>
=C2=A0 =C2=A0interval (e.g., 0.5 second) by a technical report from NHTSA<b=
r>
=C2=A0 =C2=A0(National Highway Traffic Safety Administration) [NHTSA-ACAS-R=
eport].<br>
=C2=A0 =C2=A0Such a driving safety message may include a vehicle&#39;s mobi=
lity<br>
=C2=A0 =C2=A0information (i.e., position, speed, direction, and acceleratio=
n/<br>
=C2=A0 =C2=A0deceleration).=C2=A0 The exchange interval of this message is =
0.5 second,<br>
=C2=A0 =C2=A0which is required to allow a driver to avoid a rear-end crash =
from<br>
=C2=A0 =C2=A0another vehicle.<br>
<br>
&gt;&gt;&gt; IPv6 over broadcast MAC (used to be called internet 0, 10+ yea=
rs ago)<br>
solves that MAC issue since there is no MAC.<br>
<br>
5.1.3.=C2=A0 Routing<br>
<br>
=C2=A0 =C2=A0For multihop V2V communications in either a VANET or VANETs vi=
a IP-<br>
=C2=A0 =C2=A0RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing proto=
col may<br>
=C2=A0 =C2=A0be required to support both unicast and multicast in the links=
 of the<br>
=C2=A0 =C2=A0subnet with the same IPv6 prefix.=C2=A0 However, it will be co=
stly to run<br>
=C2=A0 =C2=A0both vehicular ND and a vehicular ad hoc routing protocol in t=
erms of<br>
=C2=A0 =C2=A0control traffic overhead [ID-Multicast-Problems].<br>
<br>
&gt;&gt;&gt; we do that with IETF standards on battery operated devices alr=
eady. Using<br>
RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve see=
n 30 hops in<br>
meshes of thousands in the real world though it=E2=80=99s not the normal op=
erational<br>
model, but can happen to maintain connectivity during the reboot of a root)=
 and<br>
does not use broadcast. RPL was initially designed as a V2V2V protocol but<=
br>
found its market on the IoT. I=E2=80=99m sure the protocol would gladly com=
e back to<br>
its roots.<br>
<br>
=C2=A0 =C2=A0A routing protocol for a VANET may cause redundant wireless fr=
ames in<br>
=C2=A0 =C2=A0the air to check the neighborhood of each vehicle and compute =
the<br>
=C2=A0 =C2=A0routing information in a VANET with a dynamic network topology=
<br>
=C2=A0 =C2=A0because the IPv6 ND is used to check the neighborhood of each<=
br>
=C2=A0 =C2=A0vehicle.=C2=A0 Thus, the vehicular routing needs to take advan=
tage of the<br>
=C2=A0 =C2=A0IPv6 ND to minimize its control overhead.<br>
<br>
&gt;&gt;&gt; A clean description of the interaction of RPL and RFC 8505 in =
our IoT<br>
networks. Note that the speed of the PHY in VANET balanced the instability =
of<br>
the topology, and RPL still applies. Note also that RPL uses DV with a rout=
ing<br>
stretch in order to minimize the topology awareness that=E2=80=99s needed i=
n each node,<br>
which results in minimal signaling.<br>
<br>
5.2.=C2=A0 Mobility Management<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For a mobility management scheme in a shared link, where the w=
ireless<br>
=C2=A0 =C2=A0subnets of multiple IP-RSUs share the same prefix, an efficien=
t<br>
=C2=A0 =C2=A0vehicular-network-wide DAD is required.=C2=A0 If DHCPv6 is use=
d to assign<br>
=C2=A0 =C2=A0a unique IPv6 address to each vehicle in this shared link,<br>
<br>
&gt;&gt;&gt; I would not use the term link, or shared. Maybe shared link -&=
gt; domain?<br>
&lt;snip&gt;<br>
<br>
the DAD is<br>
=C2=A0 =C2=A0not required.=C2=A0 On the other hand, for a mobility manageme=
nt scheme<br>
=C2=A0 =C2=A0with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] a=
nd OMNI<br>
=C2=A0 =C2=A0[OMNI]), DAD is not required because the IPv6 address of a veh=
icle&#39;s<br>
=C2=A0 =C2=A0external wireless interface is guaranteed to be unique.<br>
<br>
&gt;&gt;&gt; again overselling OMNI<br>
&gt;&gt;&gt; As I said earlier, this is wring there are (64*) more chances =
of a<br>
collision in OMNI prefixes than in IPv6 IIDs. &gt;&gt;&gt; OMNI prefixes ca=
n collision,<br>
home addresses that are unique on a home network cannot. &gt;&gt;&gt; Now i=
f both the<br>
OMNI prefix and the IID are good randoms, then obviously, the chances of<br=
>
collisions round up to 0. &gt;&gt;&gt; Collision is certainly not my worst =
fear.<br>
<br>
=C2=A0 There is a<br>
=C2=A0 =C2=A0tradeoff between the prefix usage efficiency and DAD overhead.=
=C2=A0 Thus,<br>
=C2=A0 =C2=A0the IPv6 address autoconfiguration for vehicular networks need=
s to<br>
=C2=A0 =C2=A0consider this tradeoff to support efficient mobility managemen=
t.<br>
<br>
&gt;&gt;&gt; This is way too superficial and hides the reality of things.<b=
r>
- Using a VANET Infra prefix allows direct routability to the internet whic=
h<br>
BYOA does not since the BYOA is not topologically correct. Yes, it costs a =
DAD<br>
with classic ND, but it does not with RCF8505 and the draft fails to mentio=
n<br>
that. - A BYOA needs a tunnel home, and the node needs to know who is reach=
able<br>
inside the VANET and what is not to decide to tunnel or not; this is a<br>
difficult problem (vs. control place overhead) that is not discussed here.<=
br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the case of a multihomed network, a vehicle can follow the=
 first-<br>
=C2=A0 =C2=A0hop router selection rule described in [RFC8028].=C2=A0 That i=
s, the<br>
=C2=A0 =C2=A0vehicle should select its default router for each prefix by<br=
>
=C2=A0 =C2=A0preferring the router that advertised the prefix.<br>
<br>
&gt;&gt;&gt; Still router discovery (in and out) must be very fast. Thing o=
f the RA<br>
intervale in MIPv6. Is that sufficient? Too expensive?<br>
<br>
&lt;snip&gt;<br>
<br>
6.=C2=A0 Security Considerations<br>
&gt;&gt;&gt; Any discussion on the security of classical ND and other opera=
tional issues<br>
(rfc6583) ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Security and privacy are paramount in V2I, V2V, and V2X networ=
king.<br>
=C2=A0 =C2=A0Vehicles and infrastructure must be authenticated in order to<=
br>
=C2=A0 =C2=A0participate in vehicular networking.=C2=A0 Also, in-vehicle de=
vices (e.g.,<br>
=C2=A0 =C2=A0ECU) and a driver/passenger&#39;s mobile devices (e.g., smartp=
hone and<br>
=C2=A0 =C2=A0tablet PC) in a vehicle need to communicate with other in-vehi=
cle<br>
=C2=A0 =C2=A0devices and another driver/passenger&#39;s mobile devices in a=
nother<br>
=C2=A0 =C2=A0vehicle, or other servers behind an IP-RSU in a secure way.=C2=
=A0 Even<br>
=C2=A0 =C2=A0though a vehicle is perfectly authenticated and legitimate, it=
 may be<br>
=C2=A0 =C2=A0hacked for running malicious applications to track and collect=
 its<br>
=C2=A0 =C2=A0and other vehicles&#39; information.=C2=A0 In this case, an at=
tack mitigation<br>
=C2=A0 =C2=A0process may be required to reduce the aftermath of malicious<b=
r>
=C2=A0 =C2=A0behaviors.<br>
<br>
&gt;&gt;&gt; The section should mention that both with classical ND and BYO=
A, addresses<br>
can be impersonated, and RFC 8928 protects against that in both cases while=
<br>
maintaining privacy.<br>
<br>
=C2=A0 =C2=A0Even though vehicles can be authenticated with valid certifica=
tes by<br>
=C2=A0 =C2=A0an authentication server in the vehicular cloud, the authentic=
ated<br>
<br>
&gt;&gt;&gt; Is PKI feasible (deploying it in every car?). Is it fast enoug=
h? Is it<br>
really what IPWAVE thinks vehicle should use????? &gt;&gt;&gt; e.g. why wou=
ld one need<br>
to authenticate to a V2I network? &gt;&gt;&gt; from the text earlier in the=
 doc, it<br>
seemed that what you really want is access that is fast to join, capable of=
<br>
offering the reachability you want, anonymous, and innocuous (cars can not =
harm<br>
one another).<br>
<br>
=C2=A0 =C2=A0vehicles may harm other vehicles, so their communication activ=
ities<br>
=C2=A0 =C2=A0need to be logged in either a central way through a logging se=
rver<br>
=C2=A0 =C2=A0(e.g., TCC) in the vehicular cloud or a distributed way (e.g.,=
<br>
=C2=A0 =C2=A0blockchain [Bitcoin]) along with other vehicles or infrastruct=
ure.<br>
=C2=A0 =C2=A0For the non-repudiation of the harmful activities of malicious=
 nodes,<br>
=C2=A0 =C2=A0a blockchain technology can be used [Bitcoin].=C2=A0 Each mess=
age from a<br>
=C2=A0 =C2=A0vehicle can be treated as a transaction and the neighboring ve=
hicles<br>
=C2=A0 =C2=A0can play the role of peers in a consensus method of a blockcha=
in<br>
=C2=A0 =C2=A0[Bitcoin][Vehicular-BlockChain].=C2=A0 For a blockchain&#39;s =
efficient<br>
=C2=A0 =C2=A0consensus in vehicular networks having fast moving vehicles, a=
 new<br>
=C2=A0 =C2=A0consensus algorithm needs to be developed or an existing conse=
nsus<br>
=C2=A0 =C2=A0algorithm needs to be enhanced.<br>
<br>
&gt;&gt;&gt; solution space; better express the=C2=A0 security needs since =
this is a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To identify malicious vehicles among vehicles, an authenticati=
on<br>
=C2=A0 =C2=A0method is required.<br>
<br>
&gt;&gt;&gt; No. As said earlier a vehicle can be infected. You need innocu=
ousness.which<br>
can come from things like isolation, zerotrust, and protocols that are<br>
difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 is<b=
r>
protected by construction, anonymous, and fast.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the setup of a secure channel over IPsec or TLS, the multi=
hop V2I<br>
=C2=A0 =C2=A0communications over DSRC is required in a highway for the<br>
=C2=A0 =C2=A0authentication by involving multiple intermediate vehicles as =
relay<br>
=C2=A0 =C2=A0nodes toward an IP-RSU connected to an authentication server i=
n the<br>
=C2=A0 =C2=A0vehicular cloud.=C2=A0 The V2I communications over 5G V2X (or =
LTE V2X) is<br>
=C2=A0 =C2=A0required to allow a vehicle to communicate directly with a gNo=
deB (or<br>
=C2=A0 =C2=A0eNodeB) connected to an authentication server in the vehicular=
 cloud.<br>
<br>
&gt;&gt;&gt; solution space. Instead, you could mention that setting up sec=
ured channels<br>
between cars that cross one another might not complete in time to establish=
 the<br>
communication channel, and that the innocuousness must come from zerotrust =
in<br>
the transactions between the cars.<br>
=C2=A0 =C2=A0For the IPv6 ND, the DAD is required to ensure the uniqueness =
of the<br>
=C2=A0 =C2=A0IPv6 address of a vehicle&#39;s wireless interface.<br>
<br>
&gt;&gt;&gt; for classical ND (SLAAC) that=E2=80=99s true. That is not with=
 RFC 8505, since the<br>
infra maintains a table of all addresses in use in the prefix and blocks<br=
>
duplicates without the RFC 4862 DAD method. The stateful autoconf address g=
rant<br>
is immediate.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This DAD can be used<br>
=C2=A0 =C2=A0as a flooding attack that uses the DAD-related ND packets<br>
=C2=A0 =C2=A0disseminated over the VANET or vehicular networks.<br>
<br>
&gt;&gt;&gt; also for DOS attacks. You can block a owner from using an addr=
ess. A<br>
reference to rfc6959 is much needed here.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0This possibility<br>
=C2=A0 =C2=A0indicates that the vehicles and IP-RSUs need to filter out sus=
picious<br>
=C2=A0 =C2=A0ND traffic in advance.=C2=A0 Based on the SEND [RFC3971] mecha=
nism, the<br>
=C2=A0 =C2=A0authentication for routers (i.e., IP-RSUs) can be conducted by=
 only<br>
=C2=A0 =C2=A0selecting an IP-RSU that has a certification path toward trust=
ed<br>
=C2=A0 =C2=A0parties.=C2=A0 For authenticating other vehicles, the cryptogr=
aphically<br>
=C2=A0 =C2=A0generated address (CGA) can be used to verify the true owner o=
f a<br>
=C2=A0 =C2=A0received ND message, which requires to use the CGA ND option i=
n the<br>
=C2=A0 =C2=A0ND protocols.=C2=A0 For a general protection of the ND mechani=
sm, the RSA<br>
=C2=A0 =C2=A0Signature ND option can also be used to protect the integrity =
of the<br>
=C2=A0 =C2=A0messages by public key signatures.=C2=A0 For a more advanced<b=
r>
=C2=A0 =C2=A0authentication mechanism, a distributed blockchain-based mecha=
nism<br>
=C2=A0 =C2=A0[Vehicular-BlockChain] can be used.<br>
<br>
&gt;&gt;&gt; solution space. Again, the draft should focus on problems and =
needs. The<br>
problem here is that SEND is complex, and not implemented in the major stac=
k.<br>
It relies on PKI for trusting the router. The V2I need is a zerotrust model=
<br>
where one V, the other local Vs, and the I, can help each other anonymously=
 and<br>
harmlessly. &lt;snip&gt;<br>
<br>
8.=C2=A0 Informative References<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&lt;snip&gt;<br>
<br>
Voila!<br>
<br>
Keep safe;<br>
<br>
Pascal<br>
<br>
<br>
<br>
_______________________________________________<br>
its mailing list<br>
<a href=3D"mailto:its@ietf.org" target=3D"_blank">its@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/its" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/its</a><br>
</blockquote>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div>
</div>

</blockquote></div>

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
CC: CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es>, Erik Kline <ek.ietf@gmail.com>, "int-dir@ietf.org" <int-dir@ietf.org>, Last Call <last-call@ietf.org>, "its@ietf.org" <its@ietf.org>, Russ Housley <housley@vigilsec.com>, Chris Shen <shenyiwen7@gmail.com>, skku-iotlab-members <skku-iotlab-members@googlegroups.com>
Thread-Topic: [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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Subject: Re: [Int-dir] [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
CC: CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es>, Erik Kline <ek.ietf@gmail.com>, "int-dir@ietf.org" <int-dir@ietf.org>, Last Call <last-call@ietf.org>, "its@ietf.org" <its@ietf.org>, Russ Housley <housley@vigilsec.com>, Chris Shen <shenyiwen7@gmail.com>, skku-iotlab-members <skku-iotlab-members@googlegroups.com>
Thread-Topic: [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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Subject: Re: [Int-dir] [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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From: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
Date: Fri, 3 Sep 2021 16:00:44 +0900
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
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Subject: Re: [Int-dir] [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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Pascal,
Sure, I will reflect your suggested text on the next revision.

Thanks.

Best Regards,
Paul

2021=EB=85=84 9=EC=9B=94 3=EC=9D=BC (=EA=B8=88) =EC=98=A4=ED=9B=84 3:56, Pa=
scal Thubert (pthubert) <pthubert@cisco.com>=EB=8B=98=EC=9D=B4
=EC=9E=91=EC=84=B1:

> Hello Paul
>
>
>
> Rereading a sentence I found it could be clarified at the next occasion.
> No need to publish a fix now =F0=9F=98=8A
>
>
>
> The sentence is
>
>
>
> =E2=80=9C
>
>                    A node in a DODAG discovers and maintains the
>
>    upward routes toward the root node of the DODAG.  RPL uses a Distance
>
>    Vector (DV) approach, with lazy maintenance and stretched anisotropic
>
>    routing.
>
>
>
> =E2=80=9C
>
>
>
> As I reread it, it seems to mean that the DODAG comes first and then the
> nodes discover and maintain the upwards routes.
>
> The DODAG is indeed the coalescence of all upwards routes. Also, it is
> unclear that the sentence after refers to the downwards routes.
>
>
>
> What about
>
>
>
> =E2=80=9C
>
>    The RPL nodes uses an anisotropic Distance Vector (DV)approach to form
>
>    a DODAG by discovering and aggressively maintaining the upward default=
 route
>
>    towards the root of the DODAG.  Downwards routes follow the same DODAG=
,
>
> ,  with lazy maintenance and stretched P2P routing in the so-called stori=
ng
>
>    mode.
>
>
>
> =E2=80=9C
>
>
>
> Keep safe;
>
>
>
> Pascal
>
>
>
> *From:* Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
> *Sent:* vendredi 3 septembre 2021 6:52
> *To:* Pascal Thubert (pthubert) <pthubert@cisco.com>
> *Cc:* CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es>; Erik Kline <
> ek.ietf@gmail.com>; int-dir@ietf.org; Last Call <last-call@ietf.org>;
> its@ietf.org; Russ Housley <housley@vigilsec.com>; Chris Shen <
> shenyiwen7@gmail.com>; skku-iotlab-members <
> skku-iotlab-members@googlegroups.com>; Mr. Jaehoon Paul Jeong <
> jaehoon.paul@gmail.com>
> *Subject:* Re: [ipwave] Intdir last call review of
> draft-ietf-ipwave-vehicular-networking-20
>
>
>
> Pascal,
>
> Thanks a lot for your help and confirmation.
>
>
>
> Take care, too.
>
>
>
> Best Regards,
>
> Paul
>
>
>
> On Fri, Sep 3, 2021 at 1:23 PM Pascal Thubert (pthubert) <
> pthubert@cisco.com> wrote:
>
> All good Paul,
>
>
>
> we=E2=80=99re done for this round. Good luck for the next steps!
>
> Take care,
>
>
>
> Pascal
>
>
>
> Le 3 sept. 2021 =C3=A0 05:22, Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.=
com>
> a =C3=A9crit :
>
> =EF=BB=BF
>
> Hi Pascal,
>
> Thanks for your help to improve this draft significantly.
>
>
>
> I have included your suggested text in the revision (-23) as follows:
>
>
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-network=
ing-23
>
>
> -------------------------------------------------------------------------=
---------------------------------------------------------------
>
> Section 5.1.3. Routing
> ...
> RPL [RFC6550] defines a routing protocol for low-power and
> lossy networks, which constructs and maintains Destination-Oriented
> Directed Acyclic Graphs (DODAGs) optimized by an Objective Function
> (OF). A defined OF provides route selection and optimization within
> an RPL topology. A node in a DODAG discovers and maintains the
> upward routes toward the root node of the DODAG. RPL uses a Distance
> Vector (DV) approach, with lazy maintenance and stretched anisotropic
> routing. It is well-designed to reduce the topological knowledge and
> routing state that needs to be exchanged. As a result, the routing
> protocol overhead is minimized, which allows either highly
> constrained stable networks or less constrained, highly dynamic
> networks. Refer to Appendix B for the detailed description of RPL for
> multihop V2X networking.
>
> An address registration extension for 6LoWPAN (IPv6 over Low-Power
> Wireless Personal Area Network) in [RFC8505] can support light-weight
> mobility for nodes moving through different parents. [RFC8505], as
> opposed to [RFC4861], is stateful and proactively installs the ND
> cache entries, which saves broadcasts and provides a deterministic
> presence information for IPv6 addresses. Mainly it updates the
> Address Registration Option (ARO) of ND defined in [RFC6775] to
> include a status field that can indicate the movement of a node and
> optionally a Transaction ID (TID) field, i.e., a sequence number that
> can be used to determine the most recent location of a node. Thus,
> RPL can use the information provided by the Extended ARO (EARO)
> defined in [RFC8505] to deal with a certain level of node mobility.
> When a leaf node moves to the coverage of another parent node, it
> should de-register its addresses to the previous parent node and
> register itself with a new parent node along with an incremented TID.
>
>
> -------------------------------------------------------------------------=
---------------------------------------------------------------
>
>
>
> If you are satisfied with this revision, could you update
>
> the status of INTDIR Last Call Review into Ready?
>
> https://datatracker.ietf.org/doc/draft-ietf-ipwave-vehicular-networking/
>
>
>
> Carlos and Erik,
>
> If Pascal confirms the readiness of this draft,
>
> let's move it out to the next step.
>
>
>
> Thanks.
>
>
>
> Best Regards,
>
> Paul
>
>
>
> On Fri, Sep 3, 2021 at 12:50 AM Pascal Thubert (pthubert) <
> pthubert@cisco.com> wrote:
>
> You did well Paul, but I wonder if the reader of section 5.1 really cares
> about the guts of the protocols (DIO messages, who cares?) vs. what the
> protocol is optimized for.
>
>
>
> I had the same feeling about the next paragraph where you describe 8505.
> While what you are saying is correct is that of interest for the reader?
>
>
>
> The interesting piece IMHO is that 8505, as opposed to 4861,  is stateful
> and proactively installs the ND cache entries, which saves broadcasts and
> provides a deterministic presence information for IPv6 addresses=E2=80=9D=
. This is
> what I=E2=80=99d like to see written there. For the RPL piece, if you wan=
t to
> summarize my text, please insist on the fact that it=E2=80=99s =E2=80=9CD=
V, with lazy
> maintenance and stretched anisotropic routing, all designed to reduce the
> topological knowledge and routing state that needs to be exchanged. As a
> result, the routing protocol overhead is minimized, which allows either
> highly constrained stable networks or less constrained highly dynamic
> networks=E2=80=9D.
>
>
>
> *From:* Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
> *Sent:* jeudi 2 septembre 2021 17:30
> *To:* Pascal Thubert (pthubert) <pthubert@cisco.com>
> *Cc:* int-dir@ietf.org; Last Call <last-call@ietf.org>; its@ietf.org;
> Russ Housley <housley@vigilsec.com>; CARLOS JESUS BERNARDOS CANO <
> cjbc@it.uc3m.es>; Chris Shen <shenyiwen7@gmail.com>; Mr. Jaehoon Paul
> Jeong <jaehoon.paul@gmail.com>
> *Subject:* Re: [ipwave] Intdir last call review of
> draft-ietf-ipwave-vehicular-networking-20
>
>
>
> Hi Pascal,
>
> I have reflected your comments on the revision:
>
>
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-network=
ing-22
>
>
>
> Though the text provided by you is excellent, it is long, so I place it o=
n
> Appendix B:
>
>
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-network=
ing-22#appendix-B
>
>
>
> In Section 5.1.3.  Routing, I explain RPL concisely along with pros and
> cons:
>
>
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-network=
ing-22#section-5.1.3
>
>
>
> The changes with my some editings look like the following:
>
>
> -------------------------------------------------------------------------=
---------------------------------------------
>
> 5.1.3. Routing
> ...
> RPL [RFC6550] defines a routing protocol for low-power and lossy networks=
,
> which constructs and
>
> maintains DODAGs optimized by an Objective Function (OF). A defined OF
> provides route selection
>
> and optimization within an RPL topology. A node in a DODAG uses DODAG
> Information Objects (DIOs)
>
> messages to discover and maintain the upward routes toward the root node.
> Refer to Appendix B for
>
> the detailed description of RPL for multihop V2X networking.
> ...
> ----------
> Appendix B. Support of Multihop V2X Networking
> ...
> RPL is primarily designed to minimize the control plane activity, which i=
s
> the relative amount of routing
>
> protocol exchanges versus data traffic; this approach is beneficial for
> situations where the power and
>
> bandwidth are scarce (e.g., an IoT LLN where RPL is typically used today)=
,
> but also in situations of
>
> high relative mobility between the nodes in the network (also known as
> swarming, e.g., within a
>
> variable set of vehicles with a similar global motion, or a variable set
> of drones flying toward the same
>
> direction).
>
> To reduce the routing exchanges, RPL leverages a Distance Vector approach=
,
> which does not need a
>
> global knowledge of the topology, and only optimizes the routes to and
> from the root, allowing
>
> Peer-to-Peer (P2P) paths to be stretched. Although RPL installs its route=
s
> proactively, it only maintains
>
> them lazily, that is, in reaction to actual traffic, or as a slow
> background activity. Additionally, RPL
>
> leverages the concept of an objective function (called OF), which allows
> to adapt the activity of the
>
> routing protocol to use cases, e.g., type, speed, and quality of the
> radios. RPL does not need converge,
>
> and provides connectivity to most nodes most of the time. The default
> route toward the root is
>
> maintained aggressively and may change while a packet progresses without
> causing loops, so the
>
> packet will still reach the root. There are two modes for routing in RPL
> such as non-storing mode and
>
> storing mode. In non-storing mode, a node inside the mesh/swarm that
> changes its point(s) of
>
> attachment to the graph informs the root with a single unicast packet
> flowing along the default route,
>
> and the connectivity is restored immediately; this mode is preferable for
> use cases where Internet
>
> connectivity is dominant. On the other hand, in storing mode, the routing
> stretch is reduced, for a
>
> better P2P connectivity, while the Internet connectivity is restored more
> slowly, during the time for
>
> the DV operation to operate hop-by-hop. While an RPL topology can quickly
> scale up and down and
>
> fits the needs of mobility of vehicles, the total performance of the
> system will also depend on how
>
> quickly a node can form an address, join the mesh (including
> Authentication, Authorization, and
>
> Accounting (AAA)), and manage its global mobility to become reachable fro=
m
> another node outside
>
> the mesh.
> ...
>
>
> -------------------------------------------------------------------------=
---------------------------------------------
>
>
>
> If you have further comments, please let me know.
>
>
>
> Thanks.
>
>
>
> Best Regards,
>
> Paul
>
>
>
> On Thu, Sep 2, 2021 at 3:49 PM Pascal Thubert (pthubert) <
> pthubert@cisco.com> wrote:
>
> Hello Paul
>
>
>
> This is absolutely excellent. I=E2=80=99m very happy will all the changes=
 and your
> attached pdf made my life as a reviewer a lot simpler.
>
>
>
> This is really a great way of progressing together. Many thanks for that!
>
>
>
> I=E2=80=99m all good but for a little snippet in the new text which is ac=
tually
> incorrect, and denotes a usual misunderstanding of RPL that your doc may
> help correct for the future:
>
>
>
> =E2=80=9C
>
> Although RPL can be used in IPv6-based vehicular networks, it is primaril=
y
> designed for lossy
>
> networks, which puts energy efficiency first. In addition, the topology i=
t
> considers may not
>
> quickly scale up and down for IPv6-based vehicular networks, since the
> mobility of vehicles is
>
> much more diverse with a high speed, so it can frequently alter a
> tree-like topology formed by
>
> RPL, which may cause network fragmentation and merging with more control
> traffic
>
> =E2=80=9C
>
>
>
>
>
> The roots of my contribution to RPL are in vehicular networks, exactly th=
e
> use case you describe. Based on that experience (including some actual te=
st
> with NASA) I=E2=80=99d change the text above with:
>
>
>
>
>
> =E2=80=9C
>
> RPL is primarily designed to minimize the control plane activity, that is
> the relative amount of routing protocol exchanges vs. data traffic; this
> approach is beneficial for situations where the power and bandwidth are
> scarce (e.g., an IoT LLN where RPL is typically used today), but also in
> situations of high relative mobility between the nodes in the network (ak=
a
> swarming, e.g., within a variable set of vehicles with a similar global
> motion, or a toon of drones).
>
> To reduce the routing exchanges, RPL leverages a Distance Vector approach=
,
> which does not need a global knowledge of the topology, and only optimize=
s
> the routes to and from the root, allowing P2P paths to be stretched.
> Although RPL installs its routes proactively, it only maintains them
> lazily, in reaction to actual traffic, or as a slow background activity.
> Additionally, RPL leverages the concept of an objective function, which
> allows to adapt the activity of the routing protocol to the use case, e.g=
.,
> type, speed, and quality of the radios. RPL does not need converge, and
> provides connectivity to most nodes most of the time. The default route
> towards the Root is maintained aggressively and may change while a packet
> progresses without causing loops, so the packet will still reach the root=
.
> In non-storing mode, a node inside the mesh/swarm that changes its point(=
s)
> of attachment to the graph informs the root with a single unicast packet
> the flows along the default route, and the connectivity is restored
> immediately; this mode is preferable for use cases where internet
> connectivity is dominant. OTOH, in storing mode, the routing stretch is
> reduced, for a better P2P connectivity, while the internet connectivity i=
s
> restored more slowly, time for the DV operation to operate hop-by-hop.
> While a RPL topology can quickly scale up and down and fits the needs of
> mobility of vehicles, the total performance of the system will also depen=
d
> on how quickly a node can form an address, join the mesh (including AAA),
> and manage its global mobility to become reachable from outside the mesh.
>
> =E2=80=9C
>
>
>
> Otherwise, all good!
>
>
>
> Take care,
>
>
>
> Pascal
>
>
>
>
>
> *From:* Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
> *Sent:* lundi 30 ao=C3=BBt 2021 15:12
> *To:* Pascal Thubert (pthubert) <pthubert@cisco.com>
> *Cc:* int-dir@ietf.org; Last Call <last-call@ietf.org>;
> draft-ietf-ipwave-vehicular-networking.all@ietf.org; its@ietf.org; Russ
> Housley <housley@vigilsec.com>; CARLOS JESUS BERNARDOS CANO <
> cjbc@it.uc3m.es>; skku-iotlab-members <
> skku-iotlab-members@googlegroups.com>; Chris Shen <shenyiwen7@gmail.com>;
> Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
> *Subject:* Re: [ipwave] Intdir last call review of
> draft-ietf-ipwave-vehicular-networking-20
>
>
>
> Hi Pascal,
>
> Here is the revision (-21) of IPWAVE PS Draft:
>
>
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-network=
ing-21
>
>
>
> I attach the revision letter to show how I have addressed your comments o=
n
> the revision.
>
>
>
> Chris and I have worked for this revision together.
>
>
>
> If you have further comments, please let me know.
>
>
>
> Thanks.
>
>
>
> Best Regards,
>
> Paul
>
>
>
>
>
>
>
> On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert via Datatracker <
> noreply@ietf.org> wrote:
>
> Reviewer: Pascal Thubert
> Review result: Not Ready
>
> Dear authors
>
> In summary:
>
> I read a number of very good drafts collated in one, from the use cases
> that
> very complete and ready to publish, to the architecture and protocol
> solution
> in section 4 that would require more work for completeness.
>
> There are multiple instances in the use cases where protocols are listed
> coming
> out of the blue, e.g., the references to OMNI that seem artificially spre=
ad
> regardless of the context of the section. OMNI is used throughout, both a=
s
> an
> open ended toolbox, and as a carpet under which all problems can be hidde=
n.
>
> Reading this doc, OMNI shows as an interface to a software mobile router,
> with
> multiple of the device physical interfaces connected to the mobile router=
.
> This
> makes the stack very simple as the complexity moves to the router. But no=
w
> you
> have to implement the router. Presented as that, the OMNI router deserves
> its
> name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANET=
 (many to
> choose from) and NEMO (and all the MIP protocol family across address
> families), all the possible radio interfaces on which the ND problems go
> away
> by magic, and whatever else you want to put in there. Is that the
> intention?
>
> Instead of referring to OMNI for virtually anything, the doc should refer
> to
> MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),
> draft-nordmark-intarea-ippl for split subnets, and
> draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet
> models. And
> then you can say that all those components can be plugged in the OMNI
> router,
> and you can discuss which MANET and which MIP you want, including using
> OMNI=E2=80=99s
> built in mobility.
>
> Note that my objections are not against the OMNI design, it might be the
> perfect thing and I am already aware of use cases that could be served by=
 a
> P2MP interface like OMNI in conjunction with RFC8505 on the P2P
> subinterfaces
> (recycling the high level design we=E2=80=99ve been shipping for IPv4 / f=
rame
> relay for
> the last 30 years). My objection is of the way the draft uses [OMNI] as t=
he
> magic wand that solves all the problems when what you really do is throw
> them
> over the fence. I=E2=80=99d rather you focus on problems and use cases, f=
or which
> there=E2=80=99s excellent text, and indicate what needs to be done withou=
t making
> assumption on how the needful things will be solved.
>
> In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to s=
plit,
> keep all
> that=E2=80=99s use case and problem description and ship it, remove refer=
ences to
> protocols envisioned in the solution, and start the work on architecture
> of the
> solution and the protocol applicability statements separately. An alterna=
te
> would be to centralize the discussion on protocols to annex, and explain
> that
> protocol A or B could be envisioned in solution space because to over thi=
s
> gap
> or implement that function.
>
> In any fashion, the current text is not ready for publication as
> applicability
> statement, architecture and or/solution, so the related work should be
> removed
> from the main text. But I find it mostly ready for use case and problem
> statement, more below.
>
> Review:
>
> Abstract
>
>    This document discusses the problem statement and use cases of
>    IPv6-based vehicular networking for Intelligent Transportation
>    Systems (ITS).
>
> >>> The document goes beyond that; there was actually a thread at 6MAN
> where
> Bob Hinden said =E2=80=9C This document says it is a problem statement, b=
ut then
> becomes a solution document.   Might be better to cut it down to only the
> problem statement part. =E2=80=9C >>> Would you consider doing this? If n=
ot, why?
> Note:
> you may want to respond on 6MAN as well. >>> >>>I would have thought that
> the
> traditional steps of problem statement and applicability statement of
> existing
> work could be expected from IPWAVE too. >>> Please clarify the steps that
> you
> intend to follow next with this work.
>
> <snip>
>
> 1.  Introduction
>
> >>> Very readable and informative section, many thanks!
>
>    Along with these WAVE standards and C-V2X standards, regardless of a
>    wireless access technology under the IP stack of a vehicle, vehicular
>    networks can operate IP mobility with IPv6 [RFC8200] and Mobile IPv6
>    protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (PMIPv6)
>    [RFC5213], Distributed Mobility Management (DMM) [RFC7333], Locator/
>    ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Extended
>    Route Optimization (AERO) [RFC6706BIS]).
>
> >>> NEMO (RFC 3963) is not cited. Any reason why the vehicle would not
> transport a network?
>
> <snip>
>
>    This document describes use cases and a problem statement about
>    IPv6-based vehicular networking for ITS, which is named IPv6 Wireless
>    Access in Vehicular Environments (IPWAVE).  First, it introduces the
>    use cases for using V2V, V2I, and V2X networking in ITS.  Next, for
>    IPv6-based vehicular networks, it makes a gap analysis of current
>    IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Management,
>    and Security & Privacy), and then enumerates requirements for the
>    extensions of those IPv6 protocols, which are tailored to IPv6-based
>    vehicular networking.  Thus, this document is intended to motivate
>    development of key protocols for IPWAVE.
>
> >>>
>
> <snip>
>
> 2.  Terminology
>
> >>>
>
> <snip>
>
>    o  IP-OBU: "Internet Protocol On-Board Unit": An IP-OBU denotes a
>       computer situated in a vehicle (e.g., car, bicycle, autobike,
>       motor cycle, and a similar one) and a device (e.g., smartphone and
>       IoT device).  It has at least one IP interface that runs in IEEE
>       802.11-OCB and has an "OBU" transceiver.  Also, it may have an IP
>       interface that runs in Cellular V2X (C-V2X) [TS-23.285-3GPP]
>       [TR-22.886-3GPP][TS-23.287-3GPP].  See the definition of the term
>       "OBU" in [RFC8691].
>
> >>> Can that be a router connecting multiple computers?
>
> <snip>
>
> 3.  Use Cases
>
> >>> This is another great read and an enlightening section. Maybe mention
> in
> the abstract that the doc also covers use cases?
>
> <snip>
>
>    Although a Layer-2 solution can provide a support for multihop
>    communications in vehicular networks, the scalability issue related
>    to multihop forwarding still remains when vehicles need to
>    disseminate or forward packets toward multihop-away destinations.  In
>    addition, the IPv6-based approach for V2V as a network layer protocol
>    can accommodate multiple radio technologies as MAC protocols, such as
>    5G V2X and DSRC.  Therefore, the existing IPv6 protocol can be
>    augmented through the addition of an Overlay Multilink Network (OMNI)
>    Interface [OMNI] and/or protocol changes in order to support both
>    wireless single-hop/multihop V2V communications and multiple radio
>    technologies in vehicular networks.  In such a way, vehicles can
>    communicate with each other by V2V communications to share either an
>    emergency situation or road hazard in a highway having multiple kinds
>    of radio technologies, such as 5G V2X and DSRC.
>
> >>> This text appears in the middle of high level use case, with a crude
> list
> of protocols; this is not a place for it
>
> >>> On a 6MAN Thread, Brian Carpenter said that the above:
> =E2=80=9C
> is of concern regardless of the mention of OMNI. Does it mean "can be" or
> "needs to be"? This paragraph seems like a very short summary of a big
> problem
> area. At the end of page 13 there is some related discussion, which
> mentions
> RPL as part of the solution (good choice, IMHO) but again seems to depend
> on
> OMNI. I don't think the fix of simply removing references to OMNI works,
> because it would leave a gap. In an informational document, that is not a
> formal problem but as far as this draft describes architecture, I don't
> think
> that big a gap is reasonable. "OMNI" is mentioned more than 20 times in t=
he
> document. There are also several references to AERO, which is strongly
> associated with OMNI. =E2=80=9C >>> I agree with Brian. Here the document=
 seems to
> be
> mixing solution with problem and putting the cart before the horse. My
> recommendation is to stick to what needs to be done that IPv6 does not do
> yet
> -the reqs and gaps-; but the doc should not step in the how things will b=
e
> done
> unless the group already decided to do it. The logical next steps to a PS
> are
> an applicability statement of existing work, and if the gaps cannot be
> filled,
> there may be one or more WG chartered to fill those gaps.
>
> >>> I=E2=80=99d still be happy to see an annex with leads on where the so=
lution
> might
> come from like RFC 8691 does.
>
> <snip>
>
>    The existing IPv6 protocol must be augmented through the addition of
>    an OMNI interface and/or protocol changes in order to support
>    wireless multihop V2I communications in a highway where RSUs are
>    sparsely deployed, so a vehicle can reach the wireless coverage of an
>    RSU through the multihop data forwarding of intermediate vehicles.
>    Thus, IPv6 needs to be extended for multihop V2I communications.
>
> >>> Note that I have no clue on how well OMNI applies in that space, mayb=
e
> it
> does very well; but here it comes out of the blue with no justification.
> If you
> mention OMNI you need to detail what it is and which of the V2V  problems
> you
> expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.
>
> <snip>
>
>    The existing IPv6 protocol must be augmented through the addition of
>    an OMNI interface and/or protocol changes in order to support
>    wireless multihop V2X (or V2I2X) communications in an urban road
>    network where RSUs are deployed at intersections, so a vehicle (or a
>    pedestrian's smartphone) can reach the wireless coverage of an RSU
>    through the multihop data forwarding of intermediate vehicles (or
>    pedestrians' smartphones).  Thus, IPv6 needs to be extended for
>    multihop V2X (or V2I2X) communications.
>
> >>> Please be more specific on what the missing functions are and whether
> they
> are missing from the stack development standpoint or if there=E2=80=99s w=
ork needed
> from the IETF. 1)      If something is really missing in our specs, the
> text to
> prove from the use case above is missing 2)      how OMNI serves the use
> case
> could be elaborated in an applicability statement of OMNI for V2xyz, but
> it is
> a bit blunt to present it as panacea when the problems to be solved are n=
ot
> listed. 3)      If you look at it, OMNI seems like a software mobile rout=
er
> within a bump in the stack. Can that become too big?
>
> >>> my view is that the text above and the similar occasions should be
> replaced
> by something like :
>
>    The existing IPv6 protocol must be augmented to provide the following
>    functions: 1) =E2=80=A6
>
> >>> and / or something like:
>
>    In addition to the IPv6 node requirements [RFC 8504], the IPv6 protoco=
l
>    stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=A6
>
> <snip>
>
>    To support applications of these V2X use cases, the functions of IPv6
>    such as VND, VMM, and VSP are prerequisites for IPv6-based packet
>    exchange, transport-layer session continuity, and secure, safe
>    communication between a vehicle and a pedestrian either directly or
>    indirectly via an IP-RSU.
>
> >>> =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=9D doe=
s not parse.
> There=E2=80=99s
> no IPv6 reference that provides those functions. If the intention is to s=
ay
> that there=E2=80=99s stuff to add to IPv6 to support, like, say,  VND, th=
en this
> document fails to define how an IPv6 VND should behave, though it=E2=80=
=99s
> precisely
> what I=E2=80=99d expect from a problem statement.
>
> <snip>
>
> 4.  Vehicular Networks
>
> >>> What is the purpose of section 4 as a whole, problem statement or
> applicability statement of the listed protocols? In the former case what=
=E2=80=99s
> the
> problem? In the latter case it is incomplete and needs to be exported to =
an
> applicability statement doc with all the possible technologies evaluated.
>
>    This section describes an example vehicular network architecture
>    supporting V2V, V2I, and V2X communications in vehicular networks.
>
> >>> I read this as presenting a context to explain what the problems are
> instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe us=
ing the term
> =E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=99=
s comment.
>
> <snip>
>
> 4.1.  Vehicular Network Architecture
>
>    Figure 1 shows an example vehicular network architecture for V2I and
>    V2V in a road network [OMNI].
>
> a.      Is using OMNI a decision that the WG made for the future work ?
> what
> does it do and what does it not do? b.      Is there work left to be done=
?
> Who
> will do that work? Or is it the expectation that OMNI has it all defined
> already?
>
> <snip>
>
>    An existing network architecture (e.g., an IP-based aeronautical
>    network architecture [OMNI][UAM-ITS], a network architecture of
>    PMIPv6 [RFC5213], and a low-power and lossy network architecture
>    [RFC6550]) can be extended to a vehicular network architecture for
>    multihop V2V, V2I, and V2X, as shown in Figure 1.  In a highway
>    scenario, a vehicle may not access an RSU directly because of the
>    distance of the DSRC coverage (up to 1 km).  For example, the OMNI
>    interface and/or RPL (IPv6 Routing Protocol for Low-Power and Lossy
>    Networks) [RFC6550] can be extended to support a multihop V2I since a
>    vehicle can take advantage of other vehicles as relay nodes to reach
>    the RSU.  Also, RPL can be extended to support both multihop V2V and
>    V2X in the similar way.
>
> >>> all this could fit well in annex; anyway you need to explain what you
> expect the protocols to do and which extension is needed. In the case of
> RPL at
> least you indicate that it would do routing, but not why you cannot use i=
t
> of
> the shelf; for OMNI, what you expect is less clear, though there=E2=80=99=
s text
> elsewhere about the many radio interfaces that could be used for the
> purpose,
> and the text in the UAM below that is enlightening.
>
> <snip>
>
>                                   To support not only the mobility
>    management of the UAM end systems, but also the multihop and
>    multilink communications of the UAM interfaces, the UAM end systems
>    can employ an Overlay Multilink Network (OMNI) interface [OMNI] as a
>    virtual Non-Broadcast Multiple Access (NBMA) connection to a serving
>    ground domain infrastructure.
>
> >>> Again, what is the expectation for OMNI? As an overlay it requires an
> underlay; when connecting to a MANET it needs support for that MANET. The
> text
> above seems to imply that is solves everything in V2xyz like magic;
> reminds me
> of the IPv6 multicast abstraction that was supposed to solve the broadcas=
t
> problem and ended up worsening it.
>
> <snip>
>
>                             This infrastructure can be configured
>    over the underlying data links.  The OMNI interface and its link
>    model provide a means of multilink, multihop and mobility
>    coordination to the legacy IPv6 ND messaging [RFC4861] according to
>    the NBMA principle.  Thus, the OMNI link model can support efficient
>    UAM internetworking services without additional mobility messaging,
>    and without any modification to the IPv6 ND messaging services or
>    link model.
>
> >>> Again, what is the expectation for OMNI? As an overlay it requires an
> underlay; the text above seems to imply that is solves everything in V2xy=
z
> like
> magic; that would be a stretch, that reminds me of IPv6 multicast that wa=
s
> supposed to solve the broadcast problem and ended up worsening it.
>
> <snip>
>
>    Multiple vehicles under the coverage of an RSU share a prefix just as
>    mobile nodes share a prefix of a Wi-Fi access point in a wireless
>    LAN.  This is a natural characteristic in infrastructure-based
>    wireless networks.  For example, in Figure 1, two vehicles (i.e.,
>    Vehicle2, and Vehicle5) can use Prefix 1 to configure their IPv6
>    global addresses for V2I communication.  Alternatively, mobile nodes
>    can employ an OMNI interface and use their own IPv6 Unique Local
>    Addresses (ULAs) [RFC4193] over the wireless network without
>    requiring the messaging of IPv6 Stateless Address Autoconfiguration
>   (SLAAC) [RFC4862], which uses an on-link prefix provided by the
>    (visited) wireless LAN; this technique is known as "Bring-Your-Own-
>    Addresses".
>
> >>>  Is OMNI the only way to "Bring-Your-Own-Addresses=E2=80=9D? Else the=
 text
> could be
> more generic, at least use e.g., like the ref to AERO later. >>> What are
> the
> implications / limitations of doing that =E2=80=93 like they can do line =
of sight
> V2V
> but not reach the internet, or the need of  a local MANET / RPL that will
> accept to route those addresses, or the security / address ownership
> validation
> issues ?
>
> <snip>
>
>    A single subnet prefix announced by an RSU can span multiple vehicles
>    in VANET.  For example, in Figure 1, for Prefix 1, three vehicles
>    (i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a connected
>    VANET.  Also, for Prefix 2, two vehicles (i.e., Vehicle3 and
>    Vehicle6) can construct another connected VANET, and for Prefix 3,
>    two vehicles (i.e., Vehicle4 and Vehicle7) can construct another
>    connected VANET.  Alternatively, each vehicle could employ an OMNI
>    interface with their own ULAs such that no topologically-oriented
>    subnet prefixes need be announced by the RSU.
>
> >>>  same as above. This seems to restate the same thing, derive an addre=
ss
> from a topologically correct prefix or use your own with limitations to b=
e
> described.
>
> <snip>
>
>    For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]
>    specifies several details, including Maximum Transmission Unit (MTU),
>    frame format, link-local address, address mapping for unicast and
>    multicast, stateless autoconfiguration, and subnet structure.  An
>    Ethernet Adaptation (EA) layer is in charge of transforming some
>    parameters between the IEEE 802.11 MAC layer and the IPv6 network
>    layer, which is located between the IEEE 802.11-OCB's logical link
>    control layer and the IPv6 network layer.  This IPv6 over 802.11-OCB
>    can be used for both V2V and V2I in IPv6-based vehicular networks.
>
> >>>  solution space.
>
> <snip>
>
>    An IPv6 mobility solution is needed for the guarantee of
>    communication continuity in vehicular networks so that a vehicle's
>    TCP session can be continued, or UDP packets can be delivered to a
>    vehicle as a destination without loss while it moves from an IP-RSU's
>    wireless coverage to another IP-RSU's wireless coverage.  In
>    Figure 1, assuming that Vehicle2 has a TCP session (or a UDP session)
>    with a corresponding node in the vehicular cloud, Vehicle2 can move
>    from IP-RSU1's wireless coverage to IP-RSU2's wireless coverage.  In
>    this case, a handover for Vehicle2 needs to be performed by either a
>    host-based mobility management scheme (e.g., MIPv6 [RFC6275]) or a
>    network-based mobility management scheme (e.g., PMIPv6 [RFC5213] and
>    AERO [RFC6706BIS]).
>
>    In the host-based mobility scheme (e.g., MIPv6), an IP-RSU plays a
>    role of a home agent.  On the other hand, in the network-based
>    mobility scheme (e.g., PMIPv6, an MA plays a role of a mobility
>    management controller such as a Local Mobility Anchor (LMA) in
>    PMIPv6, which also serves vehicles as a home agent, and an IP-RSU
>    plays a role of an access router such as a Mobile Access Gateway
>    (MAG) in PMIPv6 [RFC5213].  The host-based mobility scheme needs
>    client functionality in IPv6 stack of a vehicle as a mobile node for
>    mobility signaling message exchange between the vehicle and home
>    agent.  On the other hand, the network-based mobility scheme does not
>    need such a client functionality for a vehicle because the network
>    infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility agent
>    handles the mobility signaling message exchange with the home agent
>    (e.g., LMA in PMIPv6) for the sake of the vehicle.
>
>    There are a scalability issue and a route optimization issue in the
>    network-based mobility scheme (e.g., PMIPv6) when an MA covers a
>    large vehicular network governing many IP-RSUs.  In this case, a
>    distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate the
>    scalability issue by distributing multiple MAs in the vehicular
>    network such that they are positioned closer to vehicles for route
>    optimization and bottleneck mitigation in a central MA in the
>    network-based mobility scheme.  All these mobility approaches (i.e.,
>    a host-based mobility scheme, network-based mobility scheme, and
>    distributed mobility scheme) and a hybrid approach of a combination
>    of them need to provide an efficient mobility service to vehicles
>    moving fast and moving along with the relatively predictable
>    trajectories along the roadways.
>
>    In vehicular networks, the control plane can be separated from the
>    data plane for efficient mobility management and data forwarding by
>    using the concept of Software-Defined Networking (SDN)
>    [RFC7149][DMM-FPC].  Note that Forwarding Policy Configuration (FPC)
>    in [DMM-FPC], which is a flexible mobility management system, can
>    manage the separation of data-plane and control-plane in DMM.  In
>    SDN, the control plane and data plane are separated for the efficient
>    management of forwarding elements (e.g., switches and routers) where
>    an SDN controller configures the forwarding elements in a centralized
>    way and they perform packet forwarding according to their forwarding
>    tables that are configured by the SDN controller.  An MA as an SDN
>    controller needs to efficiently configure and monitor its IP-RSUs and
>    vehicles for mobility management, location management, and security
>    services.
>
>    The mobility information of a GPS receiver mounted in its vehicle
>    (e.g., position, speed, and direction) can be used to accommodate
>    mobility-aware proactive handover schemes, which can perform the
>    handover of a vehicle according to its mobility and the wireless
>    signal strength of a vehicle and an IP-RSU in a proactive way.
>
>    Vehicles can use the TCC as their Home Network having a home agent
>    for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5213],
>    so the TCC (or an MA inside the TCC) maintains the mobility
>    information of vehicles for location management.  IP tunneling over
>    the wireless link should be avoided for performance efficiency.
>    Also, in vehicular networks, asymmetric links sometimes exist and
>    must be considered for wireless communications such as V2V and V2I.
>
> >>>  This is all very informative text but does not state a problem. Is
> there a
> problem is left to be solved or are we assessing the applicability of
> protocols? Could it for instance, forward point to issues discussed in
> section
> 5?
>
> <snip>
>
>    As shown in Figure 3, as internal networks, a vehicle's moving
>    network and an EN's fixed network are self-contained networks having
>    multiple subnets and having an edge router (e.g., IP-OBU and IP-RSU)
>    for the communication with another vehicle or another EN.  The
>    internetworking between two internal networks via V2I communication
>    requires the exchange of the network parameters and the network
>    prefixes of the internal networks.  For the efficiency, the network
>    prefixes of the internal networks (as a moving network) in a vehicle
>    need to be delegated and configured automatically.  Note that a
>    moving network's network prefix can be called a Mobile Network Prefix
>    (MNP) [OMNI].
>
> >>> Then again you=E2=80=99re overselling OMNI. MNP is originally defined=
 here
> https://datatracker.ietf.org/doc/html/rfc3963#section-2 and that=E2=80=99=
s a
> reference
> you can use normatively.
>
> <snip>
>
>    As shown in Figure 3, the addresses used for IPv6 transmissions over
>    the wireless link interfaces for IP-OBU and IP-RSU can be either
>    global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets can be
>    routed within vehicular networks [OMNI].
>
> >>> Then again you=E2=80=99re overselling OMNI. There needs to  be a rout=
ing
> protocol
> like a MANET that will accept to carry the
>  MNPs, and that must be implemented by the infra and both cars. The OMNI
> spec
>  is clear on that. This is why at first glance I see OMNI as a full mobil=
e
>  router in a bump in the stack. Now what is the problem behind this? No
> such
>  protocol at IETF? Too many to choose from? No deployment?
> <snip>
>
> When global IPv6 addresses
>    are used, wireless interface configuration and control overhead for
>    Duplicate Address Detection (DAD) [RFC4862] and Multicast Listener
>    Discovery (MLD) [RFC2710][RFC3810] should be minimized to support V2I
>    and V2X communications for vehicles moving fast along roadways; when
>    ULAs and the OMNI interface are used, no DAD nor MLD messaging is
>    needed.
>
> >>> Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it the no d=
ad needed a
> property
> of injecting a BYOA in the fabric for an GUA MIP Home Address which is
> known to
> be unique at home? >>> OTOH, autoconf=E2=80=99ing a random ULA =E2=80=9CF=
D=E2=80=A6=E2=80=9Dprefix has
> lesser
> DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classica=
l subnet.
> So
> who says DAD isn=E2=80=99t required for OMNI ULA? >>> note that IMHO DAD =
on
> wireless is
> a lot more harm than good, and I agree that with a good pseudo random
> generator
> the ULA has no chance to collision in the real world, as OMNI claims. It=
=E2=80=99s
> just
> that your argument here plays the other way, because there are less rando=
m
> bits
> (56)  in the ULA prefix than in the IID (62), and if one starts using mor=
e
> prefix bits to be non-random, there will be a time when DAD on prefix is
> needed.
>
> <snip>
>
>    Let us consider the upload/download time of a vehicle when it passes
>    through the wireless communication coverage of an IP-RSU.  For a
>    given typical setting where 1km is the maximum DSRC communication
>    range [DSRC] and 100km/h is the speed limit in highway, the dwelling
>    time can be calculated to be 72 seconds by dividing the diameter of
>    the 2km (i.e., two times of DSRC communication range where an IP-RSU
>    is located in the center of the circle of wireless communication) by
>    the speed limit of 100km/h (i.e., about 28m/s).  For the 72 seconds,
>    a vehicle passing through the coverage of an IP-RSU can upload and
>    download data packets to/from the IP-RSU.
>
> <snip>
>
> 4.3.  V2V-based Internetworking
>
> >>> In this section it looks like the cars are in a stable line of sight
> relationship. Which is probably fine for a platoon, but when you drive
> along
> with friends in different cars, you realize that the line of sight
> assumption
> does not stand over time. Soon enough, other cars meddle in, and possibly
> one
> of the cars drives faster and too far ahead so you need the infra to rela=
y,
> possibly over multiple infra hops.
>
> >>> so in this section, I=E2=80=99d expect to see a Vehicle communicating=
 with
> another
> one and using either line of sight or V2V relaying but also using relay
> via V2I
> (multihop I2I not just hub and spoke V2I2V ), alternatively to together f=
or
> redundancy. Is that part of the problem?
>
> >>> reading deeper section 5 I found excellent text on routing via V and
> via I.
> This tells that section 4 does not play a good role at justifying section
> 5.
> Maybe keep section 4 for another doc?
>
> >>> What kind or reliability is required in a V2V use case? Do you think
> ND can
> handle it? Or MANET? What would be the assumption on L2 (roaming time,
> unicast
> vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3
> redundancy?
>
> <snip>
>
> 5.  Problem Statement
>
> <snip>
>
>    In order to specify protocols using the architecture mentioned in
>    Section 4.1, IPv6 core protocols have to be adapted to overcome
>    certain challenging aspects of vehicular networking.  Since the
>    vehicles are likely to be moving at great speed, protocol exchanges
>    need to be completed in a time relatively short compared to the
>    lifetime of a link between a vehicle and an IP-RSU, or between two
>    vehicles.
>
> >>> Any order of magnitude?
> >>> Can you indicate whether this already rules out certain procedures,
> e.g.
> DAD ?
>
>    The lifetime of a session varies depending on the session's type such
>    as a web surfing, voice call over IP, and DNS query.  Regardless of a
>    session's type, to guide all the IPv6 packets to their destination
>    host, IP mobility should be supported for the session.
>
> >>> this seems to be for unicast when you know who to talk to. Is there a
> need
> some multicast groups like anybody around interested in topic blah like I
> could
> be multicasting the speed of vehicles coming the other way that I crossed
> recently, for use of vehicles that I=E2=80=99m crossing now, so they can =
see a
> slowdown
> on advance
>
>    Thus, the time constraint of a wireless link has a major impact on
>    IPv6 Neighbor Discovery (ND).  Mobility Management (MM) is also
>    vulnerable to disconnections that occur before the completion of
>    identity verification and tunnel management.  This is especially true
>    given the unreliable nature of wireless communication.  This section
>    presents key topics such as neighbor discovery and mobility
>    management.
>
> >>> Only ND? What about the MANET?
> >>> how fast should ND be to be suitable?
> >>> is there also a bandwidth check? You can make things much faster if y=
ou
> dedicate a lot of spectrum to it. But that can also be a waste.
>
> 5.1.  Neighbor Discovery
>
> <snip>
>
>    The requirements for IPv6 ND for vehicular networks are efficient DAD
>    and NUD operations.
>
> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast,
> which
> is a good idea in my book?
>
>  <snip>
>
>       This merging and partitioning should be considered for the
>    IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAAC)
>    [RFC4862].
>
> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast,
> which
> is a good idea in my book?
>
>  <snip>
>
>    Also, the partitioning of a VANET may make vehicles with the same
>    prefix be physically unreachable.  Also, SLAAC needs to prevent IPv6
>    address duplication due to the merging of VANETs.  According to the
>    merging and partitioning, a destination vehicle (as an IPv6 host)
>    needs to be distinguished as either an on-link host or an off-link
>    host even though the source vehicle uses the same prefix as the
>    destination vehicle.
>
> >>> should reference to draft-nordmark-intarea-ippl
>
>    To efficiently prevent IPv6 address duplication due to the VANET
>    partitioning and merging from happening in vehicular networks, the
>    vehicular networks need to support a vehicular-network-wide DAD by
>    defining a scope that is compatible with the legacy DAD.  In this
>    case, two vehicles can communicate with each other when there exists
>    a communication path over VANET or a combination of VANETs and IP-
>    RSUs, as shown in Figure 1.  By using the vehicular-network-wide DAD,
>    vehicles can assure that their IPv6 addresses are unique in the
>    vehicular network whenever they are connected to the vehicular
>    infrastructure or become disconnected from it in the form of VANET.
>
> >>> Excellent
>
>    ND time-related parameters such as router lifetime and Neighbor
>    Advertisement (NA) interval need to be adjusted for vehicle speed and
>    vehicle density.  For example, the NA interval needs to be
>    dynamically adjusted according to a vehicle's speed so that the
>    vehicle can maintain its neighboring vehicles in a stable way,
>    considering the collision probability with the NA messages sent by
>    other vehicles.
>
> >>> Is that a problem or just an operational setting that needs to be
> found?
> >>> Do we need to reconsider the concepts of those timers?
>
> <snip>
>
>    Thus, in IPv6-based vehicular networking, IPv6 ND should have minimum
>    changes for the interoperability with the legacy IPv6 ND used in the
>    Internet, including the DAD and NUD operations.
>
> >>> I do not find the logical link with the text before, why is this a
> =E2=80=9Cthus=E2=80=9D?
> >>> why should the ND inside the VANET be constrained to be interoperable=
?
> This
> may place constraints on the solution.
>
> 5.1.1.  Link Model
>
>    A prefix model for a vehicular network needs to facilitate the
>
> >>> Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=80=9Cp=
refix model=E2=80=9D.
> >>> it would make this piece and the next should refer to
> draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both
> link
> and subnet issues. The general ideas are the same, but the gory details
> here
> are slightly incorrect, like this notion of prefix model than comes out o=
f
> the
> blue. The model is really the subnet model for the subnet associated to
> P2MP.
>
>    communication between two vehicles with the same prefix regardless of
>    the vehicular network topology as long as there exist bidirectional
>    E2E paths between them in the vehicular network including VANETs and
>    IP-RSUs.  This prefix model allows vehicles with the same prefix to
>    communicate with each other via a combination of multihop V2V and
>    multihop V2I with VANETs and IP-RSUs.  Note that the OMNI interface
>    supports an NBMA link model where multihop V2V and V2I communications
>    use each mobile node's ULAs without need for any DAD or MLD
>    messaging.
>
> >>> again overselling OMNI.
> >>> I kinda agree about the OMNI interface model, nothing against that.
> But you
> must see that there needs a lot more than what the OMNI interface to get
> packets across V and I hops to the destination. Like routing ala MANET,
> redundancy handling ala DetNet because it will be very lossy, path
> management
> ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND so=
 it does
> not
> solve the ND problems above.
>
>    IPv6 protocols work under certain assumptions that do not necessarily
>    hold for vehicular wireless access link types other than OMNI/NBMA
>    [VIP-WAVE][RFC5889]; the rest of this section discusses implications
>    for those link types that do not apply when the OMNI/NBMA link model
>
> >>> again overselling OMNI.
> >>> The keyword here is P2MP / NBMA, and OMNI is one interface that accep=
ts
> that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already P=
2MP /
> NBMA,
> using routing to complete the partial mesh in P2MP. The text seems to imp=
ly
> that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI =
is loaded
> with
> other stuff than a plain P2MP capable interface. And ND over P2MP is not
> done
> by OMNI, OMNI only makes classical ND worse and only works in a full mesh=
.
> OTOH
> RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work ver=
y
> well
> within an OMNI interface and solve those problems. >>> My point is that y=
ou
> need to tell the full story or refrain from entering solution space in
> this doc
>
> <snip>
>
>    There is a relationship between a link and a prefix, besides the
>    different scopes that are expected from the link-local and global
>    types of IPv6 addresses.  In an IPv6 link, it is assumed that all
>    interfaces which are configured with the same subnet prefix and with
>    on-link bit set can communicate with each other on an IPv6 link.
>
> >>> not assumed; that=E2=80=99s what the onlink but set tells. The conclu=
sion
> should be
> that the VANET cannot set the O bit.
>
>    However, the vehicular link model needs to define the relationship
>    between a link and a prefix, considering the dynamics of wireless
>    links and the characteristics of VANET.
>
> <snip>
>
>    From the previous observation, a vehicular link model should consider
>    the frequent partitioning and merging of VANETs due to vehicle
>    mobility.  Therefore, the vehicular link model needs to use an on-
>    link prefix and off-link prefix according to the network topology of
>    vehicles such as a one-hop reachable network and a multihop reachable
>
> >>> No, the once a node saw a O bit set that sticks even if it sees other
> advertisements of the PIO with the O bit not set. >>> This is a global an=
d
> intrinsic property of the prefix (and an attack vector that could be
> mentioned
> in the sec section). >>> the VANET prefix must never come with the O bit
> set.
>
> <snip>
>
>    network (or partitioned networks).  If the vehicles with the same
>    prefix are reachable from each other in one hop, the prefix should be
>    on-link.
>
> >>>> No, see above; but the router may redirect though it is really risky
> unless this is a stable situation like a parking place.
>
>    Thus, in IPv6-based vehicular networking, the vehicular link model
>    should have minimum changes for interoperability with standard IPv6
>    links in an efficient fashion to support IPv6 DAD, MLD and NUD
>    operations.  When the OMNI NBMA link model is used, there are no link
>    model changes nor DAD/MLD messaging required.
>
> >>>> again overselling OMNI.
> >>>> You need a good P2MP subnet model with routing support when the mesh
> is
> partial. My company alone has been shipping million of nodes that build
> subnets
> of thousands, and that was done using IETF standards.
>
> <snip>
>
>    For vehicular networks with high mobility and density, the DAD needs
>    to be performed efficiently with minimum overhead so that the
>    vehicles can exchange a driving safety message (e.g., collision
>    avoidance and accident notification) with each other with a short
>    interval (e.g., 0.5 second) by a technical report from NHTSA
>    (National Highway Traffic Safety Administration) [NHTSA-ACAS-Report].
>    Such a driving safety message may include a vehicle's mobility
>    information (i.e., position, speed, direction, and acceleration/
>    deceleration).  The exchange interval of this message is 0.5 second,
>    which is required to allow a driver to avoid a rear-end crash from
>    another vehicle.
>
> >>> IPv6 over broadcast MAC (used to be called internet 0, 10+ years ago)
> solves that MAC issue since there is no MAC.
>
> 5.1.3.  Routing
>
>    For multihop V2V communications in either a VANET or VANETs via IP-
>    RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing protocol may
>    be required to support both unicast and multicast in the links of the
>    subnet with the same IPv6 prefix.  However, it will be costly to run
>    both vehicular ND and a vehicular ad hoc routing protocol in terms of
>    control traffic overhead [ID-Multicast-Problems].
>
> >>> we do that with IETF standards on battery operated devices already.
> Using
> RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve s=
een 30
> hops in
> meshes of thousands in the real world though it=E2=80=99s not the normal
> operational
> model, but can happen to maintain connectivity during the reboot of a
> root) and
> does not use broadcast. RPL was initially designed as a V2V2V protocol bu=
t
> found its market on the IoT. I=E2=80=99m sure the protocol would gladly c=
ome back
> to
> its roots.
>
>    A routing protocol for a VANET may cause redundant wireless frames in
>    the air to check the neighborhood of each vehicle and compute the
>    routing information in a VANET with a dynamic network topology
>    because the IPv6 ND is used to check the neighborhood of each
>    vehicle.  Thus, the vehicular routing needs to take advantage of the
>    IPv6 ND to minimize its control overhead.
>
> >>> A clean description of the interaction of RPL and RFC 8505 in our IoT
> networks. Note that the speed of the PHY in VANET balanced the instabilit=
y
> of
> the topology, and RPL still applies. Note also that RPL uses DV with a
> routing
> stretch in order to minimize the topology awareness that=E2=80=99s needed=
 in each
> node,
> which results in minimal signaling.
>
> 5.2.  Mobility Management
>
> <snip>
>
>    For a mobility management scheme in a shared link, where the wireless
>    subnets of multiple IP-RSUs share the same prefix, an efficient
>    vehicular-network-wide DAD is required.  If DHCPv6 is used to assign
>    a unique IPv6 address to each vehicle in this shared link,
>
> >>> I would not use the term link, or shared. Maybe shared link -> domain=
?
> <snip>
>
> the DAD is
>    not required.  On the other hand, for a mobility management scheme
>    with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] and OMNI
>    [OMNI]), DAD is not required because the IPv6 address of a vehicle's
>    external wireless interface is guaranteed to be unique.
>
> >>> again overselling OMNI
> >>> As I said earlier, this is wring there are (64*) more chances of a
> collision in OMNI prefixes than in IPv6 IIDs. >>> OMNI prefixes can
> collision,
> home addresses that are unique on a home network cannot. >>> Now if both
> the
> OMNI prefix and the IID are good randoms, then obviously, the chances of
> collisions round up to 0. >>> Collision is certainly not my worst fear.
>
>   There is a
>    tradeoff between the prefix usage efficiency and DAD overhead.  Thus,
>    the IPv6 address autoconfiguration for vehicular networks needs to
>    consider this tradeoff to support efficient mobility management.
>
> >>> This is way too superficial and hides the reality of things.
> - Using a VANET Infra prefix allows direct routability to the internet
> which
> BYOA does not since the BYOA is not topologically correct. Yes, it costs =
a
> DAD
> with classic ND, but it does not with RCF8505 and the draft fails to
> mention
> that. - A BYOA needs a tunnel home, and the node needs to know who is
> reachable
> inside the VANET and what is not to decide to tunnel or not; this is a
> difficult problem (vs. control place overhead) that is not discussed here=
.
>
> <snip>
>
>    For the case of a multihomed network, a vehicle can follow the first-
>    hop router selection rule described in [RFC8028].  That is, the
>    vehicle should select its default router for each prefix by
>    preferring the router that advertised the prefix.
>
> >>> Still router discovery (in and out) must be very fast. Thing of the R=
A
> intervale in MIPv6. Is that sufficient? Too expensive?
>
> <snip>
>
> 6.  Security Considerations
> >>> Any discussion on the security of classical ND and other operational
> issues
> (rfc6583) ?
>
> <snip>
>
>    Security and privacy are paramount in V2I, V2V, and V2X networking.
>    Vehicles and infrastructure must be authenticated in order to
>    participate in vehicular networking.  Also, in-vehicle devices (e.g.,
>    ECU) and a driver/passenger's mobile devices (e.g., smartphone and
>    tablet PC) in a vehicle need to communicate with other in-vehicle
>    devices and another driver/passenger's mobile devices in another
>    vehicle, or other servers behind an IP-RSU in a secure way.  Even
>    though a vehicle is perfectly authenticated and legitimate, it may be
>    hacked for running malicious applications to track and collect its
>    and other vehicles' information.  In this case, an attack mitigation
>    process may be required to reduce the aftermath of malicious
>    behaviors.
>
> >>> The section should mention that both with classical ND and BYOA,
> addresses
> can be impersonated, and RFC 8928 protects against that in both cases whi=
le
> maintaining privacy.
>
>    Even though vehicles can be authenticated with valid certificates by
>    an authentication server in the vehicular cloud, the authenticated
>
> >>> Is PKI feasible (deploying it in every car?). Is it fast enough? Is i=
t
> really what IPWAVE thinks vehicle should use????? >>> e.g. why would one
> need
> to authenticate to a V2I network? >>> from the text earlier in the doc, i=
t
> seemed that what you really want is access that is fast to join, capable =
of
> offering the reachability you want, anonymous, and innocuous (cars can no=
t
> harm
> one another).
>
>    vehicles may harm other vehicles, so their communication activities
>    need to be logged in either a central way through a logging server
>    (e.g., TCC) in the vehicular cloud or a distributed way (e.g.,
>    blockchain [Bitcoin]) along with other vehicles or infrastructure.
>    For the non-repudiation of the harmful activities of malicious nodes,
>    a blockchain technology can be used [Bitcoin].  Each message from a
>    vehicle can be treated as a transaction and the neighboring vehicles
>    can play the role of peers in a consensus method of a blockchain
>    [Bitcoin][Vehicular-BlockChain].  For a blockchain's efficient
>    consensus in vehicular networks having fast moving vehicles, a new
>    consensus algorithm needs to be developed or an existing consensus
>    algorithm needs to be enhanced.
>
> >>> solution space; better express the  security needs since this is a PS=
.
>
> <snip>
>
>    To identify malicious vehicles among vehicles, an authentication
>    method is required.
>
> >>> No. As said earlier a vehicle can be infected. You need
> innocuousness.which
> can come from things like isolation, zerotrust, and protocols that are
> difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 is
> protected by construction, anonymous, and fast.
>
> <snip>
>
>    For the setup of a secure channel over IPsec or TLS, the multihop V2I
>    communications over DSRC is required in a highway for the
>    authentication by involving multiple intermediate vehicles as relay
>    nodes toward an IP-RSU connected to an authentication server in the
>    vehicular cloud.  The V2I communications over 5G V2X (or LTE V2X) is
>    required to allow a vehicle to communicate directly with a gNodeB (or
>    eNodeB) connected to an authentication server in the vehicular cloud.
>
> >>> solution space. Instead, you could mention that setting up secured
> channels
> between cars that cross one another might not complete in time to
> establish the
> communication channel, and that the innocuousness must come from zerotrus=
t
> in
> the transactions between the cars.
>    For the IPv6 ND, the DAD is required to ensure the uniqueness of the
>    IPv6 address of a vehicle's wireless interface.
>
> >>> for classical ND (SLAAC) that=E2=80=99s true. That is not with RFC 85=
05, since
> the
> infra maintains a table of all addresses in use in the prefix and blocks
> duplicates without the RFC 4862 DAD method. The stateful autoconf address
> grant
> is immediate.
>
>                                This DAD can be used
>    as a flooding attack that uses the DAD-related ND packets
>    disseminated over the VANET or vehicular networks.
>
> >>> also for DOS attacks. You can block a owner from using an address. A
> reference to rfc6959 is much needed here.
>
> <snip>
>
>  This possibility
>    indicates that the vehicles and IP-RSUs need to filter out suspicious
>    ND traffic in advance.  Based on the SEND [RFC3971] mechanism, the
>    authentication for routers (i.e., IP-RSUs) can be conducted by only
>    selecting an IP-RSU that has a certification path toward trusted
>    parties.  For authenticating other vehicles, the cryptographically
>    generated address (CGA) can be used to verify the true owner of a
>    received ND message, which requires to use the CGA ND option in the
>    ND protocols.  For a general protection of the ND mechanism, the RSA
>    Signature ND option can also be used to protect the integrity of the
>    messages by public key signatures.  For a more advanced
>    authentication mechanism, a distributed blockchain-based mechanism
>    [Vehicular-BlockChain] can be used.
>
> >>> solution space. Again, the draft should focus on problems and needs.
> The
> problem here is that SEND is complex, and not implemented in the major
> stack.
> It relies on PKI for trusting the router. The V2I need is a zerotrust mod=
el
> where one V, the other local Vs, and the I, can help each other
> anonymously and
> harmlessly. <snip>
>
> 8.  Informative References
>
> >>> no normative reference?
>
> >>> no normative reference?
>
> <snip>
>
> Voila!
>
> Keep safe;
>
> Pascal
>
>
>
> _______________________________________________
> its mailing list
> its@ietf.org
> https://www.ietf.org/mailman/listinfo/its
>
> --
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D
Mr. Jaehoon (Paul) Jeong, Ph.D.
Associate Professor
Department Head
Department of Computer Science and Engineering
Sungkyunkwan University
Office: +82-31-299-4957
Email: pauljeong@skku.edu, jaehoon.paul@gmail.com
Personal Homepage: http://iotlab.skku.edu/people-jaehoon-jeong.php
<http://cpslab.skku.edu/people-jaehoon-jeong.php>

--000000000000717a6805cb11dc13
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto">Pascal,</div><div dir=3D"auto">Sure, I will reflect your =
suggested text on the next revision.</div><div dir=3D"auto"><br></div><div =
dir=3D"auto">Thanks.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Bes=
t Regards,</div><div dir=3D"auto">Paul</div><div><br><div class=3D"gmail_qu=
ote"><div dir=3D"ltr" class=3D"gmail_attr">2021=EB=85=84 9=EC=9B=94 3=EC=9D=
=BC (=EA=B8=88) =EC=98=A4=ED=9B=84 3:56, Pascal Thubert (pthubert) &lt;<a h=
ref=3D"mailto:pthubert@cisco.com">pthubert@cisco.com</a>&gt;=EB=8B=98=EC=9D=
=B4 =EC=9E=91=EC=84=B1:<br></div><blockquote class=3D"gmail_quote" style=3D=
"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple" style=3D"word-wrap:break=
-word">
<div class=3D"m_-8945163600167749861WordSection1">
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Hello Paul<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Rereading a sentence I found it could be clarified at the ne=
xt occasion. No need to publish a fix now
</span></font><font face=3D"Segoe UI Emoji"><span style=3D"font-family:&quo=
t;Segoe UI Emoji&quot;,sans-serif">=F0=9F=98=8A</span></font><u></u><u></u>=
</p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">The sentence is<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Courier New"><span style=3D=
"font-size:10.0pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 A node in a DODAG discovers and maintains the<u></u><u></u>=
</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Courier New"><span style=3D=
"font-size:10.0pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 upward =
routes toward the root node of the DODAG.=C2=A0 RPL uses a Distance<u></u><=
u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Courier New"><span style=3D=
"font-size:10.0pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 Vector =
(DV) approach, with lazy maintenance and stretched anisotropic<u></u><u></u=
></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Courier New"><span style=3D=
"font-size:10.0pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 routing=
.=C2=A0
<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">As I reread it, it seems to mean that the DODAG comes first =
and then the nodes discover and maintain the upwards routes.
<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">The DODAG is indeed the coalescence of all upwards routes. A=
lso, it is unclear that the sentence after refers to the downwards routes.<=
u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">What about<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=E2=80=9C<u></u><u></u></span></font></p>
<pre><font size=3D"2" face=3D"Courier New"><span style=3D"font-size:10.0pt"=
>=C2=A0=C2=A0 The RPL nodes uses an anisotropic Distance Vector (DV)approac=
h to form<u></u><u></u></span></font></pre>
<pre><font size=3D"2" face=3D"Courier New"><span style=3D"font-size:10.0pt"=
>=C2=A0 =C2=A0a DODAG by discovering and aggressively maintaining the upwar=
d default route<u></u><u></u></span></font></pre>
<pre><font size=3D"2" face=3D"Courier New"><span style=3D"font-size:10.0pt"=
>=C2=A0 =C2=A0towards the root of the DODAG.=C2=A0 Downwards routes follow =
the same DODAG, <u></u><u></u></span></font></pre>
<pre><font size=3D"2" face=3D"Courier New"><span style=3D"font-size:10.0pt"=
>, =C2=A0with lazy maintenance and stretched P2P routing in the so-called s=
toring<u></u><u></u></span></font></pre>
<pre><font size=3D"2" face=3D"Courier New"><span style=3D"font-size:10.0pt"=
>=C2=A0 =C2=A0mode.=C2=A0 <u></u><u></u></span></font></pre>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Keep safe;<u></u><u></u></span></font></p></div></div><div l=
ang=3D"EN-US" link=3D"blue" vlink=3D"purple" style=3D"word-wrap:break-word"=
><div class=3D"m_-8945163600167749861WordSection1">
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Pascal<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><span style=3D"=
font-size:11.0pt;font-weight:bold">From:</span></font></b> Mr. Jaehoon Paul=
 Jeong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" target=3D"_blank">jaeh=
oon.paul@gmail.com</a>&gt;
<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> vendredi 3 septembre 2=
021 6:52<br>
<b><span style=3D"font-weight:bold">To:</span></b> Pascal Thubert (pthubert=
) &lt;<a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisc=
o.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Cc:</span></b> CARLOS JESUS BERNARDOS C=
ANO &lt;<a href=3D"mailto:cjbc@it.uc3m.es" target=3D"_blank">cjbc@it.uc3m.e=
s</a>&gt;; Erik Kline &lt;<a href=3D"mailto:ek.ietf@gmail.com" target=3D"_b=
lank">ek.ietf@gmail.com</a>&gt;; <a href=3D"mailto:int-dir@ietf.org" target=
=3D"_blank">int-dir@ietf.org</a>; Last Call &lt;<a href=3D"mailto:last-call=
@ietf.org" target=3D"_blank">last-call@ietf.org</a>&gt;; <a href=3D"mailto:=
its@ietf.org" target=3D"_blank">its@ietf.org</a>; Russ Housley &lt;<a href=
=3D"mailto:housley@vigilsec.com" target=3D"_blank">housley@vigilsec.com</a>=
&gt;; Chris Shen &lt;<a href=3D"mailto:shenyiwen7@gmail.com" target=3D"_bla=
nk">shenyiwen7@gmail.com</a>&gt;;
 skku-iotlab-members &lt;<a href=3D"mailto:skku-iotlab-members@googlegroups=
.com" target=3D"_blank">skku-iotlab-members@googlegroups.com</a>&gt;; Mr. J=
aehoon Paul Jeong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" target=3D"_=
blank">jaehoon.paul@gmail.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Subject:</span></b> Re: [ipwave] Intdir=
 last call review of draft-ietf-ipwave-vehicular-networking-20<u></u><u></u=
></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Pascal,<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Thanks a lot for your help and confirmation.<u></u><u></u></=
span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Take care, too.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Best Regards,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Paul<u></u><u></u></span></font></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">On Fri, Sep 3, 2021 at 1:23 PM Pascal Thubert (pthubert) &lt=
;<a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisco.com=
</a>&gt; wrote:<u></u><u></u></span></font></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">All good Paul,=C2=A0
<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><font size=3D"2" face=
=3D"Calibri"><span style=3D"font-size:11.0pt">we=E2=80=99re done for this r=
ound. Good luck for the next steps!<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Take care,<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Pascal<u></u><u></u></span></font></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><br>
<br>
<u></u><u></u></span></font></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><font size=3D"2" face=
=3D"Calibri"><span style=3D"font-size:11.0pt">Le 3 sept. 2021 =C3=A0 05:22,=
 Mr. Jaehoon Paul Jeong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" targe=
t=3D"_blank">jaehoon.paul@gmail.com</a>&gt; a =C3=A9crit=C2=A0:<u></u><u></=
u></span></font></p>
</blockquote>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=EF=BB=BF
<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Hi Pascal,
<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Thanks=C2=A0for your help to improve this draft significantl=
y.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">I have included your suggested text in the revision (-23) as=
 follows:<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-=
ipwave-vehicular-networking-23" target=3D"_blank">https://datatracker.ietf.=
org/doc/html/draft-ietf-ipwave-vehicular-networking-23</a><u></u><u></u></s=
pan></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">------------------------------------------------------------=
---------------------------------------------------------------------------=
-<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Section 5.1.3. Routing<br>
...<br>
RPL [RFC6550] defines a routing protocol for low-power and<br>
lossy networks, which constructs and maintains Destination-Oriented<br>
Directed Acyclic Graphs (DODAGs) optimized by an Objective Function<br>
(OF). A defined OF provides route selection and optimization within<br>
an RPL topology. A node in a DODAG discovers and maintains the<br>
upward routes toward the root node of the DODAG. RPL uses a Distance<br>
Vector (DV) approach, with lazy maintenance and stretched anisotropic<br>
routing. It is well-designed to reduce the topological knowledge and<br>
routing state that needs to be exchanged. As a result, the routing<br>
protocol overhead is minimized, which allows either highly<br>
constrained stable networks or less constrained, highly dynamic<br>
networks. Refer to Appendix B for the detailed description of RPL for<br>
multihop V2X networking.<br>
<br>
An address registration extension for 6LoWPAN (IPv6 over Low-Power<br>
Wireless Personal Area Network) in [RFC8505] can support light-weight<br>
mobility for nodes moving through different parents. [RFC8505], as<br>
opposed to [RFC4861], is stateful and proactively installs the ND<br>
cache entries, which saves broadcasts and provides a deterministic<br>
presence information for IPv6 addresses. Mainly it updates the<br>
Address Registration Option (ARO) of ND defined in [RFC6775] to<br>
include a status field that can indicate the movement of a node and<br>
optionally a Transaction ID (TID) field, i.e., a sequence number that<br>
can be used to determine the most recent location of a node. Thus,<br>
RPL can use the information provided by the Extended ARO (EARO)<br>
defined in [RFC8505] to deal with a certain level of node mobility.<br>
When a leaf node moves to the coverage of another parent node, it<br>
should de-register its addresses to the previous parent node and<br>
register itself with a new parent node along with an incremented TID.<u></u=
><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">------------------------------------------------------------=
---------------------------------------------------------------------------=
-<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">If you are satisfied with this revision, could you update<u>=
</u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">the status of INTDIR Last Call Review into Ready?<u></u><u><=
/u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><a href=3D"https://datatracker.ietf.org/doc/draft-ietf-ipwav=
e-vehicular-networking/" target=3D"_blank">https://datatracker.ietf.org/doc=
/draft-ietf-ipwave-vehicular-networking/</a><u></u><u></u></span></font></p=
>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Carlos and Erik,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">If Pascal confirms the readiness of this draft,<u></u><u></u=
></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">let&#39;s move it out to the next step.<u></u><u></u></span>=
</font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Thanks.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Best Regards,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Paul<u></u><u></u></span></font></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><u></u>=C2=A0<u></u></span></font></p>
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">On Fri, Sep 3, 2021 at 12:50 AM Pascal Thubert (pthubert) &l=
t;<a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisco.co=
m</a>&gt; wrote:<u></u><u></u></span></font></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">You did well Paul, but I wonder if the reader of section 5.1=
 really cares about the guts of the protocols (DIO messages,
 who cares?) vs. what the protocol is optimized for.<u></u><u></u></span></=
font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">I had the same feeling about the next paragraph where you de=
scribe 8505. While what you are saying is correct is that
 of interest for the reader? <u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">The interesting piece IMHO is that 8505, as opposed to 4861,=
 =C2=A0is stateful and proactively installs the ND cache entries,
 which saves broadcasts and provides a deterministic presence information f=
or IPv6 addresses=E2=80=9D. This is what I=E2=80=99d like to see written th=
ere. For the RPL piece, if you want to summarize my text, please insist on =
the fact that it=E2=80=99s =E2=80=9CDV, with lazy maintenance and
 stretched anisotropic routing, all designed to reduce the topological know=
ledge and routing state that needs to be exchanged. As a result, the routin=
g protocol overhead is minimized, which allows either highly constrained st=
able networks or less constrained
 highly dynamic networks=E2=80=9D.<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><span style=3D"=
font-size:11.0pt;font-weight:bold">From:</span></font></b> Mr. Jaehoon Paul=
 Jeong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" target=3D"_blank">jaeh=
oon.paul@gmail.com</a>&gt;
<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> jeudi 2 septembre 2021=
 17:30<br>
<b><span style=3D"font-weight:bold">To:</span></b> Pascal Thubert (pthubert=
) &lt;<a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisc=
o.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Cc:</span></b> <a href=3D"mailto:int-di=
r@ietf.org" target=3D"_blank">
int-dir@ietf.org</a>; Last Call &lt;<a href=3D"mailto:last-call@ietf.org" t=
arget=3D"_blank">last-call@ietf.org</a>&gt;;
<a href=3D"mailto:its@ietf.org" target=3D"_blank">its@ietf.org</a>; Russ Ho=
usley &lt;<a href=3D"mailto:housley@vigilsec.com" target=3D"_blank">housley=
@vigilsec.com</a>&gt;; CARLOS JESUS BERNARDOS CANO &lt;<a href=3D"mailto:cj=
bc@it.uc3m.es" target=3D"_blank">cjbc@it.uc3m.es</a>&gt;;
 Chris Shen &lt;<a href=3D"mailto:shenyiwen7@gmail.com" target=3D"_blank">s=
henyiwen7@gmail.com</a>&gt;; Mr. Jaehoon Paul Jeong &lt;<a href=3D"mailto:j=
aehoon.paul@gmail.com" target=3D"_blank">jaehoon.paul@gmail.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Subject:</span></b> Re: [ipwave] Intdir=
 last call review of draft-ietf-ipwave-vehicular-networking-20<u></u><u></u=
></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Hi Pascal,<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">I have reflected your comments on=C2=A0the revision:<u></u><=
u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-=
ipwave-vehicular-networking-22" target=3D"_blank">https://datatracker.ietf.=
org/doc/html/draft-ietf-ipwave-vehicular-networking-22</a><u></u><u></u></s=
pan></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Though the text provided by you is excellent, it is long, so=
 I place it on Appendix B:<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-=
ipwave-vehicular-networking-22#appendix-B" target=3D"_blank">https://datatr=
acker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networking-22#appendix-=
B</a><u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">In Section=C2=A05.1.3.=C2=A0 Routing, I explain RPL concisel=
y along with pros and cons:<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-=
ipwave-vehicular-networking-22#section-5.1.3" target=3D"_blank">https://dat=
atracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networking-22#sectio=
n-5.1.3</a><u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">The changes with my some editings look like the following:<u=
></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">------------------------------------------------------------=
----------------------------------------------------------<u></u><u></u></s=
pan></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">5.1.3. Routing<br>
...<br>
RPL [RFC6550] defines a routing protocol for low-power and lossy networks, =
which constructs and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">maintains DODAGs optimized by an Objective Function (OF). A =
defined OF provides route selection<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">and optimization within an RPL topology. A node in a DODAG u=
ses DODAG Information Objects (DIOs)<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">messages to discover and maintain the upward routes toward t=
he root node. Refer to Appendix B for<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">the detailed description of RPL for multihop V2X networking.=
<br>
...<br>
----------<br>
Appendix B. Support of Multihop V2X Networking<br>
...<br>
RPL is primarily designed to minimize the control plane activity, which is =
the relative amount of routing<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">protocol exchanges versus data traffic; this approach is ben=
eficial for situations where the power and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">bandwidth are scarce (e.g., an IoT LLN where RPL is typicall=
y used today), but also in situations of<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">high relative mobility between the nodes in the network (als=
o known as swarming, e.g., within a<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">variable set of vehicles with a similar global motion, or a =
variable set of drones flying toward the same<u></u><u></u></span></font></=
p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">direction).<br>
<br>
To reduce the routing exchanges, RPL leverages a Distance Vector approach, =
which does not need a<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">global knowledge of the topology, and only optimizes the rou=
tes to and from the root, allowing<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Peer-to-Peer (P2P) paths to be stretched. Although RPL insta=
lls its routes proactively, it only maintains<u></u><u></u></span></font></=
p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">them lazily, that is, in reaction to actual traffic, or as a=
 slow background activity. Additionally, RPL<u></u><u></u></span></font></p=
>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">leverages the concept of an objective function (called OF), =
which allows to adapt the activity of the<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">routing protocol to use cases, e.g., type, speed, and qualit=
y of the radios. RPL does not need converge,<u></u><u></u></span></font></p=
>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">and provides connectivity to most nodes most of the time. Th=
e default route toward the root is<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">maintained aggressively and may change while a packet progre=
sses without causing loops, so the<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">packet will still reach the root. There are two modes for ro=
uting in RPL such as non-storing mode and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">storing mode. In non-storing mode, a node inside the mesh/sw=
arm that changes its point(s) of<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">attachment to the graph informs the root with a single unica=
st packet flowing along the default route,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">and the connectivity is restored immediately; this mode is p=
referable for use cases where Internet<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">connectivity is dominant. On the other hand, in storing mode=
, the routing stretch is reduced, for a<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">better P2P connectivity, while the Internet connectivity is =
restored more slowly, during the time for<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">the DV operation to operate hop-by-hop. While an RPL topolog=
y can quickly scale up and down and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">fits the needs of mobility of vehicles, the total performanc=
e of the system will also depend on how<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">quickly a node can form an address, join the mesh (including=
 Authentication, Authorization, and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Accounting (AAA)), and manage its global mobility to become =
reachable from another node outside<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">the mesh.<br>
...<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">------------------------------------------------------------=
----------------------------------------------------------<u></u><u></u></s=
pan></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">If you=C2=A0have further comments, please let me know.<u></u=
><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Thanks.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Best Regards,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Paul<u></u><u></u></span></font></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">On Thu, Sep 2, 2021 at 3:49 PM Pascal Thubert (pthubert) &lt=
;<a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisco.com=
</a>&gt;
 wrote:<u></u><u></u></span></font></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Hello Paul<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">This is absolutely excellent. I=E2=80=99m very happy will al=
l the changes and your attached pdf made my life as a reviewer a
 lot simpler. <u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">This is really a great way of progressing together. Many tha=
nks for that!<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">I=E2=80=99m all good but for a little snippet in the new tex=
t which is actually incorrect, and denotes a usual misunderstanding
 of RPL that your doc may help correct for the future:<u></u><u></u></span>=
</font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">Although RPL can be used in IPv6-based v=
ehicular networks, it is primarily designed for lossy</span></font><u></u><=
u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">networks, which puts energy efficiency f=
irst. In addition, the topology it considers may not</span></font><u></u><u=
></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">quickly scale up and down for IPv6-based=
 vehicular networks, since the mobility of vehicles is</span></font><u></u>=
<u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">much more diverse with a high speed, so =
it can frequently alter a tree-like topology formed by</span></font><u></u>=
<u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">RPL, which may cause network fragmentati=
on and merging with more control traffic</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">=E2=80=9C</span></font><u></u><u></u></p=
>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">The roots of my contribution to RPL are =
in vehicular networks, exactly the use case you describe.
 Based on that experience (including some actual test with NASA) I=E2=80=99=
d change the text above with:</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">=E2=80=9C</span></font><u></u><u></u></p=
>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">RPL is primarily designed to minimize th=
e control plane activity, that is the relative amount of
 routing protocol exchanges vs. data traffic; this approach is beneficial f=
or situations where the power and bandwidth are scarce (e.g., an IoT LLN wh=
ere RPL is typically used today), but also in situations of high relative m=
obility between the nodes in the
 network (aka swarming, e.g., within a variable set of vehicles with a simi=
lar global motion, or a toon of drones).</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">To reduce the routing exchanges, RPL lev=
erages a Distance Vector approach, which does not need a
 global knowledge of the topology, and only optimizes the routes to and fro=
m the root, allowing P2P paths to be stretched. Although RPL installs its r=
outes proactively, it only maintains them lazily, in reaction to actual tra=
ffic, or as a slow background activity.
 Additionally, RPL leverages the concept of an objective function, which al=
lows to adapt the activity of the routing protocol to the use case, e.g., t=
ype, speed, and quality of the radios. RPL does not need converge, and prov=
ides connectivity to most nodes
 most of the time. The default route towards the Root is maintained aggress=
ively and may change while a packet progresses without causing loops, so th=
e packet will still reach the root. In non-storing mode, a node inside the =
mesh/swarm that changes its point(s)
 of attachment to the graph informs the root with a single unicast packet t=
he flows along the default route, and the connectivity is restored immediat=
ely; this mode is preferable for use cases where internet connectivity is d=
ominant. OTOH, in storing mode,
 the routing stretch is reduced, for a better P2P connectivity, while the i=
nternet connectivity is restored more slowly, time for the DV operation to =
operate hop-by-hop. While a RPL topology can quickly scale up and down and =
fits the needs of mobility of vehicles,
 the total performance of the system will also depend on how quickly a node=
 can form an address, join the mesh (including AAA), and manage its global =
mobility to become reachable from outside the mesh.</span></font><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">=E2=80=9C</span></font><u></u><u></u></p=
>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">Otherwise, all good!</span></font><u></u=
><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">Take care,</span></font><u></u><u></u></=
p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11.0pt;font-family:ArialMT">Pascal</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><span style=3D"=
font-size:11.0pt;font-weight:bold">From:</span></font></b> Mr. Jaehoon Paul=
 Jeong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" target=3D"_blank">jaeh=
oon.paul@gmail.com</a>&gt;
<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> lundi 30 ao=C3=BBt 202=
1 15:12<br>
<b><span style=3D"font-weight:bold">To:</span></b> Pascal Thubert (pthubert=
) &lt;<a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisc=
o.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Cc:</span></b> <a href=3D"mailto:int-di=
r@ietf.org" target=3D"_blank">
int-dir@ietf.org</a>; Last Call &lt;<a href=3D"mailto:last-call@ietf.org" t=
arget=3D"_blank">last-call@ietf.org</a>&gt;;
<a href=3D"mailto:draft-ietf-ipwave-vehicular-networking.all@ietf.org" targ=
et=3D"_blank">
draft-ietf-ipwave-vehicular-networking.all@ietf.org</a>; <a href=3D"mailto:=
its@ietf.org" target=3D"_blank">
its@ietf.org</a>; Russ Housley &lt;<a href=3D"mailto:housley@vigilsec.com" =
target=3D"_blank">housley@vigilsec.com</a>&gt;; CARLOS JESUS BERNARDOS CANO=
 &lt;<a href=3D"mailto:cjbc@it.uc3m.es" target=3D"_blank">cjbc@it.uc3m.es</=
a>&gt;; skku-iotlab-members &lt;<a href=3D"mailto:skku-iotlab-members@googl=
egroups.com" target=3D"_blank">skku-iotlab-members@googlegroups.com</a>&gt;=
;
 Chris Shen &lt;<a href=3D"mailto:shenyiwen7@gmail.com" target=3D"_blank">s=
henyiwen7@gmail.com</a>&gt;; Mr. Jaehoon Paul Jeong &lt;<a href=3D"mailto:j=
aehoon.paul@gmail.com" target=3D"_blank">jaehoon.paul@gmail.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Subject:</span></b> Re: [ipwave] Intdir=
 last call review of draft-ietf-ipwave-vehicular-networking-20<u></u><u></u=
></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Hi Pascal,<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Here is the revision (-21) of IPWAVE PS Draft:<u></u><u></u>=
</span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-=
ipwave-vehicular-networking-21" target=3D"_blank">https://datatracker.ietf.=
org/doc/html/draft-ietf-ipwave-vehicular-networking-21</a><u></u><u></u></s=
pan></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">I attach the revision letter to show how I have addressed yo=
ur comments on the revision.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Chris and I have worked for this revision together.<u></u><u=
></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">If you have further comments, please let me know.<u></u><u><=
/u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Thanks.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Best Regards,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Paul<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0<u></u><u></u></span></font></p>
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert via Datatrack=
er &lt;<a href=3D"mailto:noreply@ietf.org" target=3D"_blank">noreply@ietf.o=
rg</a>&gt;
 wrote:<u></u><u></u></span></font></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-=
bottom:5.0pt">
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Reviewer: Pascal Thubert<br>
Review result: Not Ready<br>
<br>
Dear authors<br>
<br>
In summary:<br>
<br>
I read a number of very good drafts collated in one, from the use cases tha=
t<br>
very complete and ready to publish, to the architecture and protocol soluti=
on<br>
in section 4 that would require more work for completeness.<br>
<br>
There are multiple instances in the use cases where protocols are listed co=
ming<br>
out of the blue, e.g., the references to OMNI that seem artificially spread=
<br>
regardless of the context of the section. OMNI is used throughout, both as =
an<br>
open ended toolbox, and as a carpet under which all problems can be hidden.=
<br>
<br>
Reading this doc, OMNI shows as an interface to a software mobile router, w=
ith<br>
multiple of the device physical interfaces connected to the mobile router. =
This<br>
makes the stack very simple as the complexity moves to the router. But now =
you<br>
have to implement the router. Presented as that, the OMNI router deserves i=
ts<br>
name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANET (=
many to<br>
choose from) and NEMO (and all the MIP protocol family across address<br>
families), all the possible radio interfaces on which the ND problems go aw=
ay<br>
by magic, and whatever else you want to put in there. Is that the intention=
?<br>
<br>
Instead of referring to OMNI for virtually anything, the doc should refer t=
o<br>
MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),<br>
draft-nordmark-intarea-ippl for split subnets, and<br>
draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet models.=
 And<br>
then you can say that all those components can be plugged in the OMNI route=
r,<br>
and you can discuss which MANET and which MIP you want, including using OMN=
I=E2=80=99s<br>
built in mobility.<br>
<br>
Note that my objections are not against the OMNI design, it might be the<br=
>
perfect thing and I am already aware of use cases that could be served by a=
<br>
P2MP interface like OMNI in conjunction with RFC8505 on the P2P subinterfac=
es<br>
(recycling the high level design we=E2=80=99ve been shipping for IPv4 / fra=
me relay for<br>
the last 30 years). My objection is of the way the draft uses [OMNI] as the=
<br>
magic wand that solves all the problems when what you really do is throw th=
em<br>
over the fence. I=E2=80=99d rather you focus on problems and use cases, for=
 which<br>
there=E2=80=99s excellent text, and indicate what needs to be done without =
making<br>
assumption on how the needful things will be solved.<br>
<br>
In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to spl=
it, keep all<br>
that=E2=80=99s use case and problem description and ship it, remove referen=
ces to<br>
protocols envisioned in the solution, and start the work on architecture of=
 the<br>
solution and the protocol applicability statements separately. An alternate=
<br>
would be to centralize the discussion on protocols to annex, and explain th=
at<br>
protocol A or B could be envisioned in solution space because to over this =
gap<br>
or implement that function.<br>
<br>
In any fashion, the current text is not ready for publication as applicabil=
ity<br>
statement, architecture and or/solution, so the related work should be remo=
ved<br>
from the main text. But I find it mostly ready for use case and problem<br>
statement, more below.<br>
<br>
Review:<br>
<br>
Abstract<br>
<br>
=C2=A0 =C2=A0This document discusses the problem statement and use cases of=
<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for Intelligent Transportation=
<br>
=C2=A0 =C2=A0Systems (ITS).<br>
<br>
&gt;&gt;&gt; The document goes beyond that; there was actually a thread at =
6MAN where<br>
Bob Hinden said =E2=80=9C This document says it is a problem statement, but=
 then<br>
becomes a solution document.=C2=A0 =C2=A0Might be better to cut it down to =
only the<br>
problem statement part. =E2=80=9C &gt;&gt;&gt; Would you consider doing thi=
s? If not, why? Note:<br>
you may want to respond on 6MAN as well. &gt;&gt;&gt; &gt;&gt;&gt;I would h=
ave thought that the<br>
traditional steps of problem statement and applicability statement of exist=
ing<br>
work could be expected from IPWAVE too. &gt;&gt;&gt; Please clarify the ste=
ps that you<br>
intend to follow next with this work.<br>
<br>
&lt;snip&gt;<br>
<br>
1.=C2=A0 Introduction<br>
<br>
&gt;&gt;&gt; Very readable and informative section, many thanks!<br>
<br>
=C2=A0 =C2=A0Along with these WAVE standards and C-V2X standards, regardles=
s of a<br>
=C2=A0 =C2=A0wireless access technology under the IP stack of a vehicle, ve=
hicular<br>
=C2=A0 =C2=A0networks can operate IP mobility with IPv6 [RFC8200] and Mobil=
e IPv6<br>
=C2=A0 =C2=A0protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (P=
MIPv6)<br>
=C2=A0 =C2=A0[RFC5213], Distributed Mobility Management (DMM) [RFC7333], Lo=
cator/<br>
=C2=A0 =C2=A0ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Ext=
ended<br>
=C2=A0 =C2=A0Route Optimization (AERO) [RFC6706BIS]).<br>
<br>
&gt;&gt;&gt; NEMO (RFC 3963) is not cited. Any reason why the vehicle would=
 not<br>
transport a network?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0This document describes use cases and a problem statement abou=
t<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for ITS, which is named IPv6 W=
ireless<br>
=C2=A0 =C2=A0Access in Vehicular Environments (IPWAVE).=C2=A0 First, it int=
roduces the<br>
=C2=A0 =C2=A0use cases for using V2V, V2I, and V2X networking in ITS.=C2=A0=
 Next, for<br>
=C2=A0 =C2=A0IPv6-based vehicular networks, it makes a gap analysis of curr=
ent<br>
=C2=A0 =C2=A0IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Manage=
ment,<br>
=C2=A0 =C2=A0and Security &amp; Privacy), and then enumerates requirements =
for the<br>
=C2=A0 =C2=A0extensions of those IPv6 protocols, which are tailored to IPv6=
-based<br>
=C2=A0 =C2=A0vehicular networking.=C2=A0 Thus, this document is intended to=
 motivate<br>
=C2=A0 =C2=A0development of key protocols for IPWAVE.<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
2.=C2=A0 Terminology<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0o=C2=A0 IP-OBU: &quot;Internet Protocol On-Board Unit&quot;: A=
n IP-OBU denotes a<br>
=C2=A0 =C2=A0 =C2=A0 computer situated in a vehicle (e.g., car, bicycle, au=
tobike,<br>
=C2=A0 =C2=A0 =C2=A0 motor cycle, and a similar one) and a device (e.g., sm=
artphone and<br>
=C2=A0 =C2=A0 =C2=A0 IoT device).=C2=A0 It has at least one IP interface th=
at runs in IEEE<br>
=C2=A0 =C2=A0 =C2=A0 802.11-OCB and has an &quot;OBU&quot; transceiver.=C2=
=A0 Also, it may have an IP<br>
=C2=A0 =C2=A0 =C2=A0 interface that runs in Cellular V2X (C-V2X) [TS-23.285=
-3GPP]<br>
=C2=A0 =C2=A0 =C2=A0 [TR-22.886-3GPP][TS-23.287-3GPP].=C2=A0 See the defini=
tion of the term<br>
=C2=A0 =C2=A0 =C2=A0 &quot;OBU&quot; in [RFC8691].<br>
<br>
&gt;&gt;&gt; Can that be a router connecting multiple computers?<br>
<br>
&lt;snip&gt;<br>
<br>
3.=C2=A0 Use Cases<br>
<br>
&gt;&gt;&gt; This is another great read and an enlightening section. Maybe =
mention in<br>
the abstract that the doc also covers use cases?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Although a Layer-2 solution can provide a support for multihop=
<br>
=C2=A0 =C2=A0communications in vehicular networks, the scalability issue re=
lated<br>
=C2=A0 =C2=A0to multihop forwarding still remains when vehicles need to<br>
=C2=A0 =C2=A0disseminate or forward packets toward multihop-away destinatio=
ns.=C2=A0 In<br>
=C2=A0 =C2=A0addition, the IPv6-based approach for V2V as a network layer p=
rotocol<br>
=C2=A0 =C2=A0can accommodate multiple radio technologies as MAC protocols, =
such as<br>
=C2=A0 =C2=A05G V2X and DSRC.=C2=A0 Therefore, the existing IPv6 protocol c=
an be<br>
=C2=A0 =C2=A0augmented through the addition of an Overlay Multilink Network=
 (OMNI)<br>
=C2=A0 =C2=A0Interface [OMNI] and/or protocol changes in order to support b=
oth<br>
=C2=A0 =C2=A0wireless single-hop/multihop V2V communications and multiple r=
adio<br>
=C2=A0 =C2=A0technologies in vehicular networks.=C2=A0 In such a way, vehic=
les can<br>
=C2=A0 =C2=A0communicate with each other by V2V communications to share eit=
her an<br>
=C2=A0 =C2=A0emergency situation or road hazard in a highway having multipl=
e kinds<br>
=C2=A0 =C2=A0of radio technologies, such as 5G V2X and DSRC.<br>
<br>
&gt;&gt;&gt; This text appears in the middle of high level use case, with a=
 crude list<br>
of protocols; this is not a place for it<br>
<br>
&gt;&gt;&gt; On a 6MAN Thread, Brian Carpenter said that the above:<br>
=E2=80=9C<br>
is of concern regardless of the mention of OMNI. Does it mean &quot;can be&=
quot; or<br>
&quot;needs to be&quot;? This paragraph seems like a very short summary of =
a big problem<br>
area. At the end of page 13 there is some related discussion, which mention=
s<br>
RPL as part of the solution (good choice, IMHO) but again seems to depend o=
n<br>
OMNI. I don&#39;t think the fix of simply removing references to OMNI works=
,<br>
because it would leave a gap. In an informational document, that is not a<b=
r>
formal problem but as far as this draft describes architecture, I don&#39;t=
 think<br>
that big a gap is reasonable. &quot;OMNI&quot; is mentioned more than 20 ti=
mes in the<br>
document. There are also several references to AERO, which is strongly<br>
associated with OMNI. =E2=80=9C &gt;&gt;&gt; I agree with Brian. Here the d=
ocument seems to be<br>
mixing solution with problem and putting the cart before the horse. My<br>
recommendation is to stick to what needs to be done that IPv6 does not do y=
et<br>
-the reqs and gaps-; but the doc should not step in the how things will be =
done<br>
unless the group already decided to do it. The logical next steps to a PS a=
re<br>
an applicability statement of existing work, and if the gaps cannot be fill=
ed,<br>
there may be one or more WG chartered to fill those gaps.<br>
<br>
&gt;&gt;&gt; I=E2=80=99d still be happy to see an annex with leads on where=
 the solution might<br>
come from like RFC 8691 does.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2I communications in a highway where RSUs a=
re<br>
=C2=A0 =C2=A0sparsely deployed, so a vehicle can reach the wireless coverag=
e of an<br>
=C2=A0 =C2=A0RSU through the multihop data forwarding of intermediate vehic=
les.<br>
=C2=A0 =C2=A0Thus, IPv6 needs to be extended for multihop V2I communication=
s.<br>
<br>
&gt;&gt;&gt; Note that I have no clue on how well OMNI applies in that spac=
e, maybe it<br>
does very well; but here it comes out of the blue with no justification. If=
 you<br>
mention OMNI you need to detail what it is and which of the V2V=C2=A0 probl=
ems you<br>
expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2X (or V2I2X) communications in an urban ro=
ad<br>
=C2=A0 =C2=A0network where RSUs are deployed at intersections, so a vehicle=
 (or a<br>
=C2=A0 =C2=A0pedestrian&#39;s smartphone) can reach the wireless coverage o=
f an RSU<br>
=C2=A0 =C2=A0through the multihop data forwarding of intermediate vehicles =
(or<br>
=C2=A0 =C2=A0pedestrians&#39; smartphones).=C2=A0 Thus, IPv6 needs to be ex=
tended for<br>
=C2=A0 =C2=A0multihop V2X (or V2I2X) communications.<br>
<br>
&gt;&gt;&gt; Please be more specific on what the missing functions are and =
whether they<br>
are missing from the stack development standpoint or if there=E2=80=99s wor=
k needed<br>
from the IETF. 1)=C2=A0 =C2=A0 =C2=A0 If something is really missing in our=
 specs, the text to<br>
prove from the use case above is missing 2)=C2=A0 =C2=A0 =C2=A0 how OMNI se=
rves the use case<br>
could be elaborated in an applicability statement of OMNI for V2xyz, but it=
 is<br>
a bit blunt to present it as panacea when the problems to be solved are not=
<br>
listed. 3)=C2=A0 =C2=A0 =C2=A0 If you look at it, OMNI seems like a softwar=
e mobile router<br>
within a bump in the stack. Can that become too big?<br>
<br>
&gt;&gt;&gt; my view is that the text above and the similar occasions shoul=
d be replaced<br>
by something like :<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented to provide the fo=
llowing<br>
=C2=A0 =C2=A0functions: 1) =E2=80=A6<br>
<br>
&gt;&gt;&gt; and / or something like:<br>
<br>
=C2=A0 =C2=A0In addition to the IPv6 node requirements [RFC 8504], the IPv6=
 protocol<br>
=C2=A0 =C2=A0stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=
=A6<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To support applications of these V2X use cases, the functions =
of IPv6<br>
=C2=A0 =C2=A0such as VND, VMM, and VSP are prerequisites for IPv6-based pac=
ket<br>
=C2=A0 =C2=A0exchange, transport-layer session continuity, and secure, safe=
<br>
=C2=A0 =C2=A0communication between a vehicle and a pedestrian either direct=
ly or<br>
=C2=A0 =C2=A0indirectly via an IP-RSU.<br>
<br>
&gt;&gt;&gt; =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=
=9D does not parse. There=E2=80=99s<br>
no IPv6 reference that provides those functions. If the intention is to say=
<br>
that there=E2=80=99s stuff to add to IPv6 to support, like, say,=C2=A0 VND,=
 then this<br>
document fails to define how an IPv6 VND should behave, though it=E2=80=99s=
 precisely<br>
what I=E2=80=99d expect from a problem statement.<br>
<br>
&lt;snip&gt;<br>
<br>
4.=C2=A0 Vehicular Networks<br>
<br>
&gt;&gt;&gt; What is the purpose of section 4 as a whole, problem statement=
 or<br>
applicability statement of the listed protocols? In the former case what=E2=
=80=99s the<br>
problem? In the latter case it is incomplete and needs to be exported to an=
<br>
applicability statement doc with all the possible technologies evaluated.<b=
r>
<br>
=C2=A0 =C2=A0This section describes an example vehicular network architectu=
re<br>
=C2=A0 =C2=A0supporting V2V, V2I, and V2X communications in vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt; I read this as presenting a context to explain what the proble=
ms are<br>
instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe usin=
g the term<br>
=E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=99s =
comment.<br>
<br>
&lt;snip&gt;<br>
<br>
4.1.=C2=A0 Vehicular Network Architecture<br>
<br>
=C2=A0 =C2=A0Figure 1 shows an example vehicular network architecture for V=
2I and<br>
=C2=A0 =C2=A0V2V in a road network [OMNI].<br>
<br>
a.=C2=A0 =C2=A0 =C2=A0 Is using OMNI a decision that the WG made for the fu=
ture work ? what<br>
does it do and what does it not do? b.=C2=A0 =C2=A0 =C2=A0 Is there work le=
ft to be done? Who<br>
will do that work? Or is it the expectation that OMNI has it all defined<br=
>
already?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An existing network architecture (e.g., an IP-based aeronautic=
al<br>
=C2=A0 =C2=A0network architecture [OMNI][UAM-ITS], a network architecture o=
f<br>
=C2=A0 =C2=A0PMIPv6 [RFC5213], and a low-power and lossy network architectu=
re<br>
=C2=A0 =C2=A0[RFC6550]) can be extended to a vehicular network architecture=
 for<br>
=C2=A0 =C2=A0multihop V2V, V2I, and V2X, as shown in Figure 1.=C2=A0 In a h=
ighway<br>
=C2=A0 =C2=A0scenario, a vehicle may not access an RSU directly because of =
the<br>
=C2=A0 =C2=A0distance of the DSRC coverage (up to 1 km).=C2=A0 For example,=
 the OMNI<br>
=C2=A0 =C2=A0interface and/or RPL (IPv6 Routing Protocol for Low-Power and =
Lossy<br>
=C2=A0 =C2=A0Networks) [RFC6550] can be extended to support a multihop V2I =
since a<br>
=C2=A0 =C2=A0vehicle can take advantage of other vehicles as relay nodes to=
 reach<br>
=C2=A0 =C2=A0the RSU.=C2=A0 Also, RPL can be extended to support both multi=
hop V2V and<br>
=C2=A0 =C2=A0V2X in the similar way.<br>
<br>
&gt;&gt;&gt; all this could fit well in annex; anyway you need to explain w=
hat you<br>
expect the protocols to do and which extension is needed. In the case of RP=
L at<br>
least you indicate that it would do routing, but not why you cannot use it =
of<br>
the shelf; for OMNI, what you expect is less clear, though there=E2=80=99s =
text<br>
elsewhere about the many radio interfaces that could be used for the purpos=
e,<br>
and the text in the UAM below that is enlightening.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 To support not only the mobil=
ity<br>
=C2=A0 =C2=A0management of the UAM end systems, but also the multihop and<b=
r>
=C2=A0 =C2=A0multilink communications of the UAM interfaces, the UAM end sy=
stems<br>
=C2=A0 =C2=A0can employ an Overlay Multilink Network (OMNI) interface [OMNI=
] as a<br>
=C2=A0 =C2=A0virtual Non-Broadcast Multiple Access (NBMA) connection to a s=
erving<br>
=C2=A0 =C2=A0ground domain infrastructure.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; when connecting to a MANET it needs support for that MANET. The t=
ext<br>
above seems to imply that is solves everything in V2xyz like magic; reminds=
 me<br>
of the IPv6 multicast abstraction that was supposed to solve the broadcast<=
br>
problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 This infrastructure can be configured<br>
=C2=A0 =C2=A0over the underlying data links.=C2=A0 The OMNI interface and i=
ts link<br>
=C2=A0 =C2=A0model provide a means of multilink, multihop and mobility<br>
=C2=A0 =C2=A0coordination to the legacy IPv6 ND messaging [RFC4861] accordi=
ng to<br>
=C2=A0 =C2=A0the NBMA principle.=C2=A0 Thus, the OMNI link model can suppor=
t efficient<br>
=C2=A0 =C2=A0UAM internetworking services without additional mobility messa=
ging,<br>
=C2=A0 =C2=A0and without any modification to the IPv6 ND messaging services=
 or<br>
=C2=A0 =C2=A0link model.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; the text above seems to imply that is solves everything in V2xyz =
like<br>
magic; that would be a stretch, that reminds me of IPv6 multicast that was<=
br>
supposed to solve the broadcast problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Multiple vehicles under the coverage of an RSU share a prefix =
just as<br>
=C2=A0 =C2=A0mobile nodes share a prefix of a Wi-Fi access point in a wirel=
ess<br>
=C2=A0 =C2=A0LAN.=C2=A0 This is a natural characteristic in infrastructure-=
based<br>
=C2=A0 =C2=A0wireless networks.=C2=A0 For example, in Figure 1, two vehicle=
s (i.e.,<br>
=C2=A0 =C2=A0Vehicle2, and Vehicle5) can use Prefix 1 to configure their IP=
v6<br>
=C2=A0 =C2=A0global addresses for V2I communication.=C2=A0 Alternatively, m=
obile nodes<br>
=C2=A0 =C2=A0can employ an OMNI interface and use their own IPv6 Unique Loc=
al<br>
=C2=A0 =C2=A0Addresses (ULAs) [RFC4193] over the wireless network without<b=
r>
=C2=A0 =C2=A0requiring the messaging of IPv6 Stateless Address Autoconfigur=
ation<br>
=C2=A0 (SLAAC) [RFC4862], which uses an on-link prefix provided by the<br>
=C2=A0 =C2=A0(visited) wireless LAN; this technique is known as &quot;Bring=
-Your-Own-<br>
=C2=A0 =C2=A0Addresses&quot;.<br>
<br>
&gt;&gt;&gt;=C2=A0 Is OMNI the only way to &quot;Bring-Your-Own-Addresses=
=E2=80=9D? Else the text could be<br>
more generic, at least use e.g., like the ref to AERO later. &gt;&gt;&gt; W=
hat are the<br>
implications / limitations of doing that =E2=80=93 like they can do line of=
 sight V2V<br>
but not reach the internet, or the need of=C2=A0 a local MANET / RPL that w=
ill<br>
accept to route those addresses, or the security / address ownership valida=
tion<br>
issues ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0A single subnet prefix announced by an RSU can span multiple v=
ehicles<br>
=C2=A0 =C2=A0in VANET.=C2=A0 For example, in Figure 1, for Prefix 1, three =
vehicles<br>
=C2=A0 =C2=A0(i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a conne=
cted<br>
=C2=A0 =C2=A0VANET.=C2=A0 Also, for Prefix 2, two vehicles (i.e., Vehicle3 =
and<br>
=C2=A0 =C2=A0Vehicle6) can construct another connected VANET, and for Prefi=
x 3,<br>
=C2=A0 =C2=A0two vehicles (i.e., Vehicle4 and Vehicle7) can construct anoth=
er<br>
=C2=A0 =C2=A0connected VANET.=C2=A0 Alternatively, each vehicle could emplo=
y an OMNI<br>
=C2=A0 =C2=A0interface with their own ULAs such that no topologically-orien=
ted<br>
=C2=A0 =C2=A0subnet prefixes need be announced by the RSU.<br>
<br>
&gt;&gt;&gt;=C2=A0 same as above. This seems to restate the same thing, der=
ive an address<br>
from a topologically correct prefix or use your own with limitations to be<=
br>
described.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]<b=
r>
=C2=A0 =C2=A0specifies several details, including Maximum Transmission Unit=
 (MTU),<br>
=C2=A0 =C2=A0frame format, link-local address, address mapping for unicast =
and<br>
=C2=A0 =C2=A0multicast, stateless autoconfiguration, and subnet structure.=
=C2=A0 An<br>
=C2=A0 =C2=A0Ethernet Adaptation (EA) layer is in charge of transforming so=
me<br>
=C2=A0 =C2=A0parameters between the IEEE 802.11 MAC layer and the IPv6 netw=
ork<br>
=C2=A0 =C2=A0layer, which is located between the IEEE 802.11-OCB&#39;s logi=
cal link<br>
=C2=A0 =C2=A0control layer and the IPv6 network layer.=C2=A0 This IPv6 over=
 802.11-OCB<br>
=C2=A0 =C2=A0can be used for both V2V and V2I in IPv6-based vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt;=C2=A0 solution space.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An IPv6 mobility solution is needed for the guarantee of<br>
=C2=A0 =C2=A0communication continuity in vehicular networks so that a vehic=
le&#39;s<br>
=C2=A0 =C2=A0TCP session can be continued, or UDP packets can be delivered =
to a<br>
=C2=A0 =C2=A0vehicle as a destination without loss while it moves from an I=
P-RSU&#39;s<br>
=C2=A0 =C2=A0wireless coverage to another IP-RSU&#39;s wireless coverage.=
=C2=A0 In<br>
=C2=A0 =C2=A0Figure 1, assuming that Vehicle2 has a TCP session (or a UDP s=
ession)<br>
=C2=A0 =C2=A0with a corresponding node in the vehicular cloud, Vehicle2 can=
 move<br>
=C2=A0 =C2=A0from IP-RSU1&#39;s wireless coverage to IP-RSU2&#39;s wireless=
 coverage.=C2=A0 In<br>
=C2=A0 =C2=A0this case, a handover for Vehicle2 needs to be performed by ei=
ther a<br>
=C2=A0 =C2=A0host-based mobility management scheme (e.g., MIPv6 [RFC6275]) =
or a<br>
=C2=A0 =C2=A0network-based mobility management scheme (e.g., PMIPv6 [RFC521=
3] and<br>
=C2=A0 =C2=A0AERO [RFC6706BIS]).<br>
<br>
=C2=A0 =C2=A0In the host-based mobility scheme (e.g., MIPv6), an IP-RSU pla=
ys a<br>
=C2=A0 =C2=A0role of a home agent.=C2=A0 On the other hand, in the network-=
based<br>
=C2=A0 =C2=A0mobility scheme (e.g., PMIPv6, an MA plays a role of a mobilit=
y<br>
=C2=A0 =C2=A0management controller such as a Local Mobility Anchor (LMA) in=
<br>
=C2=A0 =C2=A0PMIPv6, which also serves vehicles as a home agent, and an IP-=
RSU<br>
=C2=A0 =C2=A0plays a role of an access router such as a Mobile Access Gatew=
ay<br>
=C2=A0 =C2=A0(MAG) in PMIPv6 [RFC5213].=C2=A0 The host-based mobility schem=
e needs<br>
=C2=A0 =C2=A0client functionality in IPv6 stack of a vehicle as a mobile no=
de for<br>
=C2=A0 =C2=A0mobility signaling message exchange between the vehicle and ho=
me<br>
=C2=A0 =C2=A0agent.=C2=A0 On the other hand, the network-based mobility sch=
eme does not<br>
=C2=A0 =C2=A0need such a client functionality for a vehicle because the net=
work<br>
=C2=A0 =C2=A0infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility =
agent<br>
=C2=A0 =C2=A0handles the mobility signaling message exchange with the home =
agent<br>
=C2=A0 =C2=A0(e.g., LMA in PMIPv6) for the sake of the vehicle.<br>
<br>
=C2=A0 =C2=A0There are a scalability issue and a route optimization issue i=
n the<br>
=C2=A0 =C2=A0network-based mobility scheme (e.g., PMIPv6) when an MA covers=
 a<br>
=C2=A0 =C2=A0large vehicular network governing many IP-RSUs.=C2=A0 In this =
case, a<br>
=C2=A0 =C2=A0distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate=
 the<br>
=C2=A0 =C2=A0scalability issue by distributing multiple MAs in the vehicula=
r<br>
=C2=A0 =C2=A0network such that they are positioned closer to vehicles for r=
oute<br>
=C2=A0 =C2=A0optimization and bottleneck mitigation in a central MA in the<=
br>
=C2=A0 =C2=A0network-based mobility scheme.=C2=A0 All these mobility approa=
ches (i.e.,<br>
=C2=A0 =C2=A0a host-based mobility scheme, network-based mobility scheme, a=
nd<br>
=C2=A0 =C2=A0distributed mobility scheme) and a hybrid approach of a combin=
ation<br>
=C2=A0 =C2=A0of them need to provide an efficient mobility service to vehic=
les<br>
=C2=A0 =C2=A0moving fast and moving along with the relatively predictable<b=
r>
=C2=A0 =C2=A0trajectories along the roadways.<br>
<br>
=C2=A0 =C2=A0In vehicular networks, the control plane can be separated from=
 the<br>
=C2=A0 =C2=A0data plane for efficient mobility management and data forwardi=
ng by<br>
=C2=A0 =C2=A0using the concept of Software-Defined Networking (SDN)<br>
=C2=A0 =C2=A0[RFC7149][DMM-FPC].=C2=A0 Note that Forwarding Policy Configur=
ation (FPC)<br>
=C2=A0 =C2=A0in [DMM-FPC], which is a flexible mobility management system, =
can<br>
=C2=A0 =C2=A0manage the separation of data-plane and control-plane in DMM.=
=C2=A0 In<br>
=C2=A0 =C2=A0SDN, the control plane and data plane are separated for the ef=
ficient<br>
=C2=A0 =C2=A0management of forwarding elements (e.g., switches and routers)=
 where<br>
=C2=A0 =C2=A0an SDN controller configures the forwarding elements in a cent=
ralized<br>
=C2=A0 =C2=A0way and they perform packet forwarding according to their forw=
arding<br>
=C2=A0 =C2=A0tables that are configured by the SDN controller.=C2=A0 An MA =
as an SDN<br>
=C2=A0 =C2=A0controller needs to efficiently configure and monitor its IP-R=
SUs and<br>
=C2=A0 =C2=A0vehicles for mobility management, location management, and sec=
urity<br>
=C2=A0 =C2=A0services.<br>
<br>
=C2=A0 =C2=A0The mobility information of a GPS receiver mounted in its vehi=
cle<br>
=C2=A0 =C2=A0(e.g., position, speed, and direction) can be used to accommod=
ate<br>
=C2=A0 =C2=A0mobility-aware proactive handover schemes, which can perform t=
he<br>
=C2=A0 =C2=A0handover of a vehicle according to its mobility and the wirele=
ss<br>
=C2=A0 =C2=A0signal strength of a vehicle and an IP-RSU in a proactive way.=
<br>
<br>
=C2=A0 =C2=A0Vehicles can use the TCC as their Home Network having a home a=
gent<br>
=C2=A0 =C2=A0for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5=
213],<br>
=C2=A0 =C2=A0so the TCC (or an MA inside the TCC) maintains the mobility<br=
>
=C2=A0 =C2=A0information of vehicles for location management.=C2=A0 IP tunn=
eling over<br>
=C2=A0 =C2=A0the wireless link should be avoided for performance efficiency=
.<br>
=C2=A0 =C2=A0Also, in vehicular networks, asymmetric links sometimes exist =
and<br>
=C2=A0 =C2=A0must be considered for wireless communications such as V2V and=
 V2I.<br>
<br>
&gt;&gt;&gt;=C2=A0 This is all very informative text but does not state a p=
roblem. Is there a<br>
problem is left to be solved or are we assessing the applicability of<br>
protocols? Could it for instance, forward point to issues discussed in sect=
ion<br>
5?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, as internal networks, a vehicle&#39;s mo=
ving<br>
=C2=A0 =C2=A0network and an EN&#39;s fixed network are self-contained netwo=
rks having<br>
=C2=A0 =C2=A0multiple subnets and having an edge router (e.g., IP-OBU and I=
P-RSU)<br>
=C2=A0 =C2=A0for the communication with another vehicle or another EN.=C2=
=A0 The<br>
=C2=A0 =C2=A0internetworking between two internal networks via V2I communic=
ation<br>
=C2=A0 =C2=A0requires the exchange of the network parameters and the networ=
k<br>
=C2=A0 =C2=A0prefixes of the internal networks.=C2=A0 For the efficiency, t=
he network<br>
=C2=A0 =C2=A0prefixes of the internal networks (as a moving network) in a v=
ehicle<br>
=C2=A0 =C2=A0need to be delegated and configured automatically.=C2=A0 Note =
that a<br>
=C2=A0 =C2=A0moving network&#39;s network prefix can be called a Mobile Net=
work Prefix<br>
=C2=A0 =C2=A0(MNP) [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. MNP is originally =
defined here<br>
<a href=3D"https://datatracker.ietf.org/doc/html/rfc3963#section-2" target=
=3D"_blank">https://datatracker.ietf.org/doc/html/rfc3963#section-2</a> and=
 that=E2=80=99s a reference<br>
you can use normatively.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, the addresses used for IPv6 transmission=
s over<br>
=C2=A0 =C2=A0the wireless link interfaces for IP-OBU and IP-RSU can be eith=
er<br>
=C2=A0 =C2=A0global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets ca=
n be<br>
=C2=A0 =C2=A0routed within vehicular networks [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. There needs to=C2=
=A0 be a routing protocol<br>
like a MANET that will accept to carry the<br>
=C2=A0MNPs, and that must be implemented by the infra and both cars. The OM=
NI spec<br>
=C2=A0is clear on that. This is why at first glance I see OMNI as a full mo=
bile<br>
=C2=A0router in a bump in the stack. Now what is the problem behind this? N=
o such<br>
=C2=A0protocol at IETF? Too many to choose from? No deployment?<br>
&lt;snip&gt;<br>
<br>
When global IPv6 addresses<br>
=C2=A0 =C2=A0are used, wireless interface configuration and control overhea=
d for<br>
=C2=A0 =C2=A0Duplicate Address Detection (DAD) [RFC4862] and Multicast List=
ener<br>
=C2=A0 =C2=A0Discovery (MLD) [RFC2710][RFC3810] should be minimized to supp=
ort V2I<br>
=C2=A0 =C2=A0and V2X communications for vehicles moving fast along roadways=
; when<br>
=C2=A0 =C2=A0ULAs and the OMNI interface are used, no DAD nor MLD messaging=
 is<br>
=C2=A0 =C2=A0needed.<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it t=
he no dad needed a property<br>
of injecting a BYOA in the fabric for an GUA MIP Home Address which is know=
n to<br>
be unique at home? &gt;&gt;&gt; OTOH, autoconf=E2=80=99ing a random ULA =E2=
=80=9CFD=E2=80=A6=E2=80=9Dprefix has lesser<br>
DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classical =
subnet. So<br>
who says DAD isn=E2=80=99t required for OMNI ULA? &gt;&gt;&gt; note that IM=
HO DAD on wireless is<br>
a lot more harm than good, and I agree that with a good pseudo random gener=
ator<br>
the ULA has no chance to collision in the real world, as OMNI claims. It=E2=
=80=99s just<br>
that your argument here plays the other way, because there are less random =
bits<br>
(56)=C2=A0 in the ULA prefix than in the IID (62), and if one starts using =
more<br>
prefix bits to be non-random, there will be a time when DAD on prefix is ne=
eded.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Let us consider the upload/download time of a vehicle when it =
passes<br>
=C2=A0 =C2=A0through the wireless communication coverage of an IP-RSU.=C2=
=A0 For a<br>
=C2=A0 =C2=A0given typical setting where 1km is the maximum DSRC communicat=
ion<br>
=C2=A0 =C2=A0range [DSRC] and 100km/h is the speed limit in highway, the dw=
elling<br>
=C2=A0 =C2=A0time can be calculated to be 72 seconds by dividing the diamet=
er of<br>
=C2=A0 =C2=A0the 2km (i.e., two times of DSRC communication range where an =
IP-RSU<br>
=C2=A0 =C2=A0is located in the center of the circle of wireless communicati=
on) by<br>
=C2=A0 =C2=A0the speed limit of 100km/h (i.e., about 28m/s).=C2=A0 For the =
72 seconds,<br>
=C2=A0 =C2=A0a vehicle passing through the coverage of an IP-RSU can upload=
 and<br>
=C2=A0 =C2=A0download data packets to/from the IP-RSU.<br>
<br>
&lt;snip&gt;<br>
<br>
4.3.=C2=A0 V2V-based Internetworking<br>
<br>
&gt;&gt;&gt; In this section it looks like the cars are in a stable line of=
 sight<br>
relationship. Which is probably fine for a platoon, but when you drive alon=
g<br>
with friends in different cars, you realize that the line of sight assumpti=
on<br>
does not stand over time. Soon enough, other cars meddle in, and possibly o=
ne<br>
of the cars drives faster and too far ahead so you need the infra to relay,=
<br>
possibly over multiple infra hops.<br>
<br>
&gt;&gt;&gt; so in this section, I=E2=80=99d expect to see a Vehicle commun=
icating with another<br>
one and using either line of sight or V2V relaying but also using relay via=
 V2I<br>
(multihop I2I not just hub and spoke V2I2V ), alternatively to together for=
<br>
redundancy. Is that part of the problem?<br>
<br>
&gt;&gt;&gt; reading deeper section 5 I found excellent text on routing via=
 V and via I.<br>
This tells that section 4 does not play a good role at justifying section 5=
.<br>
Maybe keep section 4 for another doc?<br>
<br>
&gt;&gt;&gt; What kind or reliability is required in a V2V use case? Do you=
 think ND can<br>
handle it? Or MANET? What would be the assumption on L2 (roaming time, unic=
ast<br>
vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3 <br=
>
redundancy?<br>
<br>
&lt;snip&gt;<br>
<br>
5.=C2=A0 Problem Statement<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0In order to specify protocols using the architecture mentioned=
 in<br>
=C2=A0 =C2=A0Section 4.1, IPv6 core protocols have to be adapted to overcom=
e<br>
=C2=A0 =C2=A0certain challenging aspects of vehicular networking.=C2=A0 Sin=
ce the<br>
=C2=A0 =C2=A0vehicles are likely to be moving at great speed, protocol exch=
anges<br>
=C2=A0 =C2=A0need to be completed in a time relatively short compared to th=
e<br>
=C2=A0 =C2=A0lifetime of a link between a vehicle and an IP-RSU, or between=
 two<br>
=C2=A0 =C2=A0vehicles.<br>
<br>
&gt;&gt;&gt; Any order of magnitude?<br>
&gt;&gt;&gt; Can you indicate whether this already rules out certain proced=
ures, e.g.<br>
DAD ?<br>
<br>
=C2=A0 =C2=A0The lifetime of a session varies depending on the session&#39;=
s type such<br>
=C2=A0 =C2=A0as a web surfing, voice call over IP, and DNS query.=C2=A0 Reg=
ardless of a<br>
=C2=A0 =C2=A0session&#39;s type, to guide all the IPv6 packets to their des=
tination<br>
=C2=A0 =C2=A0host, IP mobility should be supported for the session.<br>
<br>
&gt;&gt;&gt; this seems to be for unicast when you know who to talk to. Is =
there a need<br>
some multicast groups like anybody around interested in topic blah like I c=
ould<br>
be multicasting the speed of vehicles coming the other way that I crossed<b=
r>
recently, for use of vehicles that I=E2=80=99m crossing now, so they can se=
e a slowdown<br>
on advance<br>
<br>
=C2=A0 =C2=A0Thus, the time constraint of a wireless link has a major impac=
t on<br>
=C2=A0 =C2=A0IPv6 Neighbor Discovery (ND).=C2=A0 Mobility Management (MM) i=
s also<br>
=C2=A0 =C2=A0vulnerable to disconnections that occur before the completion =
of<br>
=C2=A0 =C2=A0identity verification and tunnel management.=C2=A0 This is esp=
ecially true<br>
=C2=A0 =C2=A0given the unreliable nature of wireless communication.=C2=A0 T=
his section<br>
=C2=A0 =C2=A0presents key topics such as neighbor discovery and mobility<br=
>
=C2=A0 =C2=A0management.<br>
<br>
&gt;&gt;&gt; Only ND? What about the MANET?<br>
&gt;&gt;&gt; how fast should ND be to be suitable?<br>
&gt;&gt;&gt; is there also a bandwidth check? You can make things much fast=
er if you<br>
dedicate a lot of spectrum to it. But that can also be a waste.<br>
<br>
5.1.=C2=A0 Neighbor Discovery<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The requirements for IPv6 ND for vehicular networks are effici=
ent DAD<br>
=C2=A0 =C2=A0and NUD operations.<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 This merging and partitioning should be considered for=
 the<br>
=C2=A0 =C2=A0IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAA=
C)<br>
=C2=A0 =C2=A0[RFC4862].<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Also, the partitioning of a VANET may make vehicles with the s=
ame<br>
=C2=A0 =C2=A0prefix be physically unreachable.=C2=A0 Also, SLAAC needs to p=
revent IPv6<br>
=C2=A0 =C2=A0address duplication due to the merging of VANETs.=C2=A0 Accord=
ing to the<br>
=C2=A0 =C2=A0merging and partitioning, a destination vehicle (as an IPv6 ho=
st)<br>
=C2=A0 =C2=A0needs to be distinguished as either an on-link host or an off-=
link<br>
=C2=A0 =C2=A0host even though the source vehicle uses the same prefix as th=
e<br>
=C2=A0 =C2=A0destination vehicle.<br>
<br>
&gt;&gt;&gt; should reference to draft-nordmark-intarea-ippl<br>
<br>
=C2=A0 =C2=A0To efficiently prevent IPv6 address duplication due to the VAN=
ET<br>
=C2=A0 =C2=A0partitioning and merging from happening in vehicular networks,=
 the<br>
=C2=A0 =C2=A0vehicular networks need to support a vehicular-network-wide DA=
D by<br>
=C2=A0 =C2=A0defining a scope that is compatible with the legacy DAD.=C2=A0=
 In this<br>
=C2=A0 =C2=A0case, two vehicles can communicate with each other when there =
exists<br>
=C2=A0 =C2=A0a communication path over VANET or a combination of VANETs and=
 IP-<br>
=C2=A0 =C2=A0RSUs, as shown in Figure 1.=C2=A0 By using the vehicular-netwo=
rk-wide DAD,<br>
=C2=A0 =C2=A0vehicles can assure that their IPv6 addresses are unique in th=
e<br>
=C2=A0 =C2=A0vehicular network whenever they are connected to the vehicular=
<br>
=C2=A0 =C2=A0infrastructure or become disconnected from it in the form of V=
ANET.<br>
<br>
&gt;&gt;&gt; Excellent<br>
<br>
=C2=A0 =C2=A0ND time-related parameters such as router lifetime and Neighbo=
r<br>
=C2=A0 =C2=A0Advertisement (NA) interval need to be adjusted for vehicle sp=
eed and<br>
=C2=A0 =C2=A0vehicle density.=C2=A0 For example, the NA interval needs to b=
e<br>
=C2=A0 =C2=A0dynamically adjusted according to a vehicle&#39;s speed so tha=
t the<br>
=C2=A0 =C2=A0vehicle can maintain its neighboring vehicles in a stable way,=
<br>
=C2=A0 =C2=A0considering the collision probability with the NA messages sen=
t by<br>
=C2=A0 =C2=A0other vehicles.<br>
<br>
&gt;&gt;&gt; Is that a problem or just an operational setting that needs to=
 be found?<br>
&gt;&gt;&gt; Do we need to reconsider the concepts of those timers?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, IPv6 ND should have =
minimum<br>
=C2=A0 =C2=A0changes for the interoperability with the legacy IPv6 ND used =
in the<br>
=C2=A0 =C2=A0Internet, including the DAD and NUD operations.<br>
<br>
&gt;&gt;&gt; I do not find the logical link with the text before, why is th=
is a =E2=80=9Cthus=E2=80=9D?<br>
&gt;&gt;&gt; why should the ND inside the VANET be constrained to be intero=
perable? This<br>
may place constraints on the solution.<br>
<br>
5.1.1.=C2=A0 Link Model<br>
<br>
=C2=A0 =C2=A0A prefix model for a vehicular network needs to facilitate the=
<br>
<br>
&gt;&gt;&gt; Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=
=80=9Cprefix model=E2=80=9D.<br>
&gt;&gt;&gt; it would make this piece and the next should refer to<br>
draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both li=
nk<br>
and subnet issues. The general ideas are the same, but the gory details her=
e<br>
are slightly incorrect, like this notion of prefix model than comes out of =
the<br>
blue. The model is really the subnet model for the subnet associated to P2M=
P.<br>
<br>
=C2=A0 =C2=A0communication between two vehicles with the same prefix regard=
less of<br>
=C2=A0 =C2=A0the vehicular network topology as long as there exist bidirect=
ional<br>
=C2=A0 =C2=A0E2E paths between them in the vehicular network including VANE=
Ts and<br>
=C2=A0 =C2=A0IP-RSUs.=C2=A0 This prefix model allows vehicles with the same=
 prefix to<br>
=C2=A0 =C2=A0communicate with each other via a combination of multihop V2V =
and<br>
=C2=A0 =C2=A0multihop V2I with VANETs and IP-RSUs.=C2=A0 Note that the OMNI=
 interface<br>
=C2=A0 =C2=A0supports an NBMA link model where multihop V2V and V2I communi=
cations<br>
=C2=A0 =C2=A0use each mobile node&#39;s ULAs without need for any DAD or ML=
D<br>
=C2=A0 =C2=A0messaging.<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; I kinda agree about the OMNI interface model, nothing against =
that. But you<br>
must see that there needs a lot more than what the OMNI interface to get<br=
>
packets across V and I hops to the destination. Like routing ala MANET,<br>
redundancy handling ala DetNet because it will be very lossy, path manageme=
nt<br>
ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND so i=
t does not<br>
solve the ND problems above.<br>
<br>
=C2=A0 =C2=A0IPv6 protocols work under certain assumptions that do not nece=
ssarily<br>
=C2=A0 =C2=A0hold for vehicular wireless access link types other than OMNI/=
NBMA<br>
=C2=A0 =C2=A0[VIP-WAVE][RFC5889]; the rest of this section discusses implic=
ations<br>
=C2=A0 =C2=A0for those link types that do not apply when the OMNI/NBMA link=
 model<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; The keyword here is P2MP / NBMA, and OMNI is one interface tha=
t accepts<br>
that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already P2M=
P / NBMA,<br>
using routing to complete the partial mesh in P2MP. The text seems to imply=
<br>
that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI is=
 loaded with<br>
other stuff than a plain P2MP capable interface. And ND over P2MP is not do=
ne<br>
by OMNI, OMNI only makes classical ND worse and only works in a full mesh. =
OTOH<br>
RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work very =
well<br>
within an OMNI interface and solve those problems. &gt;&gt;&gt; My point is=
 that you<br>
need to tell the full story or refrain from entering solution space in this=
 doc<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0There is a relationship between a link and a prefix, besides t=
he<br>
=C2=A0 =C2=A0different scopes that are expected from the link-local and glo=
bal<br>
=C2=A0 =C2=A0types of IPv6 addresses.=C2=A0 In an IPv6 link, it is assumed =
that all<br>
=C2=A0 =C2=A0interfaces which are configured with the same subnet prefix an=
d with<br>
=C2=A0 =C2=A0on-link bit set can communicate with each other on an IPv6 lin=
k.<br>
<br>
&gt;&gt;&gt; not assumed; that=E2=80=99s what the onlink but set tells. The=
 conclusion should be<br>
that the VANET cannot set the O bit.<br>
<br>
=C2=A0 =C2=A0However, the vehicular link model needs to define the relation=
ship<br>
=C2=A0 =C2=A0between a link and a prefix, considering the dynamics of wirel=
ess<br>
=C2=A0 =C2=A0links and the characteristics of VANET.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0From the previous observation, a vehicular link model should c=
onsider<br>
=C2=A0 =C2=A0the frequent partitioning and merging of VANETs due to vehicle=
<br>
=C2=A0 =C2=A0mobility.=C2=A0 Therefore, the vehicular link model needs to u=
se an on-<br>
=C2=A0 =C2=A0link prefix and off-link prefix according to the network topol=
ogy of<br>
=C2=A0 =C2=A0vehicles such as a one-hop reachable network and a multihop re=
achable<br>
<br>
&gt;&gt;&gt; No, the once a node saw a O bit set that sticks even if it see=
s other<br>
advertisements of the PIO with the O bit not set. &gt;&gt;&gt; This is a gl=
obal and<br>
intrinsic property of the prefix (and an attack vector that could be mentio=
ned<br>
in the sec section). &gt;&gt;&gt; the VANET prefix must never come with the=
 O bit set.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0network (or partitioned networks).=C2=A0 If the vehicles with =
the same<br>
=C2=A0 =C2=A0prefix are reachable from each other in one hop, the prefix sh=
ould be<br>
=C2=A0 =C2=A0on-link.<br>
<br>
&gt;&gt;&gt;&gt; No, see above; but the router may redirect though it is re=
ally risky<br>
unless this is a stable situation like a parking place.<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, the vehicular link m=
odel<br>
=C2=A0 =C2=A0should have minimum changes for interoperability with standard=
 IPv6<br>
=C2=A0 =C2=A0links in an efficient fashion to support IPv6 DAD, MLD and NUD=
<br>
=C2=A0 =C2=A0operations.=C2=A0 When the OMNI NBMA link model is used, there=
 are no link<br>
=C2=A0 =C2=A0model changes nor DAD/MLD messaging required.<br>
<br>
&gt;&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt;&gt; You need a good P2MP subnet model with routing support whe=
n the mesh is<br>
partial. My company alone has been shipping million of nodes that build sub=
nets<br>
of thousands, and that was done using IETF standards.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For vehicular networks with high mobility and density, the DAD=
 needs<br>
=C2=A0 =C2=A0to be performed efficiently with minimum overhead so that the<=
br>
=C2=A0 =C2=A0vehicles can exchange a driving safety message (e.g., collisio=
n<br>
=C2=A0 =C2=A0avoidance and accident notification) with each other with a sh=
ort<br>
=C2=A0 =C2=A0interval (e.g., 0.5 second) by a technical report from NHTSA<b=
r>
=C2=A0 =C2=A0(National Highway Traffic Safety Administration) [NHTSA-ACAS-R=
eport].<br>
=C2=A0 =C2=A0Such a driving safety message may include a vehicle&#39;s mobi=
lity<br>
=C2=A0 =C2=A0information (i.e., position, speed, direction, and acceleratio=
n/<br>
=C2=A0 =C2=A0deceleration).=C2=A0 The exchange interval of this message is =
0.5 second,<br>
=C2=A0 =C2=A0which is required to allow a driver to avoid a rear-end crash =
from<br>
=C2=A0 =C2=A0another vehicle.<br>
<br>
&gt;&gt;&gt; IPv6 over broadcast MAC (used to be called internet 0, 10+ yea=
rs ago)<br>
solves that MAC issue since there is no MAC.<br>
<br>
5.1.3.=C2=A0 Routing<br>
<br>
=C2=A0 =C2=A0For multihop V2V communications in either a VANET or VANETs vi=
a IP-<br>
=C2=A0 =C2=A0RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing proto=
col may<br>
=C2=A0 =C2=A0be required to support both unicast and multicast in the links=
 of the<br>
=C2=A0 =C2=A0subnet with the same IPv6 prefix.=C2=A0 However, it will be co=
stly to run<br>
=C2=A0 =C2=A0both vehicular ND and a vehicular ad hoc routing protocol in t=
erms of<br>
=C2=A0 =C2=A0control traffic overhead [ID-Multicast-Problems].<br>
<br>
&gt;&gt;&gt; we do that with IETF standards on battery operated devices alr=
eady. Using<br>
RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve see=
n 30 hops in<br>
meshes of thousands in the real world though it=E2=80=99s not the normal op=
erational<br>
model, but can happen to maintain connectivity during the reboot of a root)=
 and<br>
does not use broadcast. RPL was initially designed as a V2V2V protocol but<=
br>
found its market on the IoT. I=E2=80=99m sure the protocol would gladly com=
e back to<br>
its roots.<br>
<br>
=C2=A0 =C2=A0A routing protocol for a VANET may cause redundant wireless fr=
ames in<br>
=C2=A0 =C2=A0the air to check the neighborhood of each vehicle and compute =
the<br>
=C2=A0 =C2=A0routing information in a VANET with a dynamic network topology=
<br>
=C2=A0 =C2=A0because the IPv6 ND is used to check the neighborhood of each<=
br>
=C2=A0 =C2=A0vehicle.=C2=A0 Thus, the vehicular routing needs to take advan=
tage of the<br>
=C2=A0 =C2=A0IPv6 ND to minimize its control overhead.<br>
<br>
&gt;&gt;&gt; A clean description of the interaction of RPL and RFC 8505 in =
our IoT<br>
networks. Note that the speed of the PHY in VANET balanced the instability =
of<br>
the topology, and RPL still applies. Note also that RPL uses DV with a rout=
ing<br>
stretch in order to minimize the topology awareness that=E2=80=99s needed i=
n each node,<br>
which results in minimal signaling.<br>
<br>
5.2.=C2=A0 Mobility Management<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For a mobility management scheme in a shared link, where the w=
ireless<br>
=C2=A0 =C2=A0subnets of multiple IP-RSUs share the same prefix, an efficien=
t<br>
=C2=A0 =C2=A0vehicular-network-wide DAD is required.=C2=A0 If DHCPv6 is use=
d to assign<br>
=C2=A0 =C2=A0a unique IPv6 address to each vehicle in this shared link,<br>
<br>
&gt;&gt;&gt; I would not use the term link, or shared. Maybe shared link -&=
gt; domain?<br>
&lt;snip&gt;<br>
<br>
the DAD is<br>
=C2=A0 =C2=A0not required.=C2=A0 On the other hand, for a mobility manageme=
nt scheme<br>
=C2=A0 =C2=A0with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] a=
nd OMNI<br>
=C2=A0 =C2=A0[OMNI]), DAD is not required because the IPv6 address of a veh=
icle&#39;s<br>
=C2=A0 =C2=A0external wireless interface is guaranteed to be unique.<br>
<br>
&gt;&gt;&gt; again overselling OMNI<br>
&gt;&gt;&gt; As I said earlier, this is wring there are (64*) more chances =
of a<br>
collision in OMNI prefixes than in IPv6 IIDs. &gt;&gt;&gt; OMNI prefixes ca=
n collision,<br>
home addresses that are unique on a home network cannot. &gt;&gt;&gt; Now i=
f both the<br>
OMNI prefix and the IID are good randoms, then obviously, the chances of<br=
>
collisions round up to 0. &gt;&gt;&gt; Collision is certainly not my worst =
fear.<br>
<br>
=C2=A0 There is a<br>
=C2=A0 =C2=A0tradeoff between the prefix usage efficiency and DAD overhead.=
=C2=A0 Thus,<br>
=C2=A0 =C2=A0the IPv6 address autoconfiguration for vehicular networks need=
s to<br>
=C2=A0 =C2=A0consider this tradeoff to support efficient mobility managemen=
t.<br>
<br>
&gt;&gt;&gt; This is way too superficial and hides the reality of things.<b=
r>
- Using a VANET Infra prefix allows direct routability to the internet whic=
h<br>
BYOA does not since the BYOA is not topologically correct. Yes, it costs a =
DAD<br>
with classic ND, but it does not with RCF8505 and the draft fails to mentio=
n<br>
that. - A BYOA needs a tunnel home, and the node needs to know who is reach=
able<br>
inside the VANET and what is not to decide to tunnel or not; this is a<br>
difficult problem (vs. control place overhead) that is not discussed here.<=
br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the case of a multihomed network, a vehicle can follow the=
 first-<br>
=C2=A0 =C2=A0hop router selection rule described in [RFC8028].=C2=A0 That i=
s, the<br>
=C2=A0 =C2=A0vehicle should select its default router for each prefix by<br=
>
=C2=A0 =C2=A0preferring the router that advertised the prefix.<br>
<br>
&gt;&gt;&gt; Still router discovery (in and out) must be very fast. Thing o=
f the RA<br>
intervale in MIPv6. Is that sufficient? Too expensive?<br>
<br>
&lt;snip&gt;<br>
<br>
6.=C2=A0 Security Considerations<br>
&gt;&gt;&gt; Any discussion on the security of classical ND and other opera=
tional issues<br>
(rfc6583) ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Security and privacy are paramount in V2I, V2V, and V2X networ=
king.<br>
=C2=A0 =C2=A0Vehicles and infrastructure must be authenticated in order to<=
br>
=C2=A0 =C2=A0participate in vehicular networking.=C2=A0 Also, in-vehicle de=
vices (e.g.,<br>
=C2=A0 =C2=A0ECU) and a driver/passenger&#39;s mobile devices (e.g., smartp=
hone and<br>
=C2=A0 =C2=A0tablet PC) in a vehicle need to communicate with other in-vehi=
cle<br>
=C2=A0 =C2=A0devices and another driver/passenger&#39;s mobile devices in a=
nother<br>
=C2=A0 =C2=A0vehicle, or other servers behind an IP-RSU in a secure way.=C2=
=A0 Even<br>
=C2=A0 =C2=A0though a vehicle is perfectly authenticated and legitimate, it=
 may be<br>
=C2=A0 =C2=A0hacked for running malicious applications to track and collect=
 its<br>
=C2=A0 =C2=A0and other vehicles&#39; information.=C2=A0 In this case, an at=
tack mitigation<br>
=C2=A0 =C2=A0process may be required to reduce the aftermath of malicious<b=
r>
=C2=A0 =C2=A0behaviors.<br>
<br>
&gt;&gt;&gt; The section should mention that both with classical ND and BYO=
A, addresses<br>
can be impersonated, and RFC 8928 protects against that in both cases while=
<br>
maintaining privacy.<br>
<br>
=C2=A0 =C2=A0Even though vehicles can be authenticated with valid certifica=
tes by<br>
=C2=A0 =C2=A0an authentication server in the vehicular cloud, the authentic=
ated<br>
<br>
&gt;&gt;&gt; Is PKI feasible (deploying it in every car?). Is it fast enoug=
h? Is it<br>
really what IPWAVE thinks vehicle should use????? &gt;&gt;&gt; e.g. why wou=
ld one need<br>
to authenticate to a V2I network? &gt;&gt;&gt; from the text earlier in the=
 doc, it<br>
seemed that what you really want is access that is fast to join, capable of=
<br>
offering the reachability you want, anonymous, and innocuous (cars can not =
harm<br>
one another).<br>
<br>
=C2=A0 =C2=A0vehicles may harm other vehicles, so their communication activ=
ities<br>
=C2=A0 =C2=A0need to be logged in either a central way through a logging se=
rver<br>
=C2=A0 =C2=A0(e.g., TCC) in the vehicular cloud or a distributed way (e.g.,=
<br>
=C2=A0 =C2=A0blockchain [Bitcoin]) along with other vehicles or infrastruct=
ure.<br>
=C2=A0 =C2=A0For the non-repudiation of the harmful activities of malicious=
 nodes,<br>
=C2=A0 =C2=A0a blockchain technology can be used [Bitcoin].=C2=A0 Each mess=
age from a<br>
=C2=A0 =C2=A0vehicle can be treated as a transaction and the neighboring ve=
hicles<br>
=C2=A0 =C2=A0can play the role of peers in a consensus method of a blockcha=
in<br>
=C2=A0 =C2=A0[Bitcoin][Vehicular-BlockChain].=C2=A0 For a blockchain&#39;s =
efficient<br>
=C2=A0 =C2=A0consensus in vehicular networks having fast moving vehicles, a=
 new<br>
=C2=A0 =C2=A0consensus algorithm needs to be developed or an existing conse=
nsus<br>
=C2=A0 =C2=A0algorithm needs to be enhanced.<br>
<br>
&gt;&gt;&gt; solution space; better express the=C2=A0 security needs since =
this is a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To identify malicious vehicles among vehicles, an authenticati=
on<br>
=C2=A0 =C2=A0method is required.<br>
<br>
&gt;&gt;&gt; No. As said earlier a vehicle can be infected. You need innocu=
ousness.which<br>
can come from things like isolation, zerotrust, and protocols that are<br>
difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 is<b=
r>
protected by construction, anonymous, and fast.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the setup of a secure channel over IPsec or TLS, the multi=
hop V2I<br>
=C2=A0 =C2=A0communications over DSRC is required in a highway for the<br>
=C2=A0 =C2=A0authentication by involving multiple intermediate vehicles as =
relay<br>
=C2=A0 =C2=A0nodes toward an IP-RSU connected to an authentication server i=
n the<br>
=C2=A0 =C2=A0vehicular cloud.=C2=A0 The V2I communications over 5G V2X (or =
LTE V2X) is<br>
=C2=A0 =C2=A0required to allow a vehicle to communicate directly with a gNo=
deB (or<br>
=C2=A0 =C2=A0eNodeB) connected to an authentication server in the vehicular=
 cloud.<br>
<br>
&gt;&gt;&gt; solution space. Instead, you could mention that setting up sec=
ured channels<br>
between cars that cross one another might not complete in time to establish=
 the<br>
communication channel, and that the innocuousness must come from zerotrust =
in<br>
the transactions between the cars.<br>
=C2=A0 =C2=A0For the IPv6 ND, the DAD is required to ensure the uniqueness =
of the<br>
=C2=A0 =C2=A0IPv6 address of a vehicle&#39;s wireless interface.<br>
<br>
&gt;&gt;&gt; for classical ND (SLAAC) that=E2=80=99s true. That is not with=
 RFC 8505, since the<br>
infra maintains a table of all addresses in use in the prefix and blocks<br=
>
duplicates without the RFC 4862 DAD method. The stateful autoconf address g=
rant<br>
is immediate.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This DAD can be used<br>
=C2=A0 =C2=A0as a flooding attack that uses the DAD-related ND packets<br>
=C2=A0 =C2=A0disseminated over the VANET or vehicular networks.<br>
<br>
&gt;&gt;&gt; also for DOS attacks. You can block a owner from using an addr=
ess. A<br>
reference to rfc6959 is much needed here.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0This possibility<br>
=C2=A0 =C2=A0indicates that the vehicles and IP-RSUs need to filter out sus=
picious<br>
=C2=A0 =C2=A0ND traffic in advance.=C2=A0 Based on the SEND [RFC3971] mecha=
nism, the<br>
=C2=A0 =C2=A0authentication for routers (i.e., IP-RSUs) can be conducted by=
 only<br>
=C2=A0 =C2=A0selecting an IP-RSU that has a certification path toward trust=
ed<br>
=C2=A0 =C2=A0parties.=C2=A0 For authenticating other vehicles, the cryptogr=
aphically<br>
=C2=A0 =C2=A0generated address (CGA) can be used to verify the true owner o=
f a<br>
=C2=A0 =C2=A0received ND message, which requires to use the CGA ND option i=
n the<br>
=C2=A0 =C2=A0ND protocols.=C2=A0 For a general protection of the ND mechani=
sm, the RSA<br>
=C2=A0 =C2=A0Signature ND option can also be used to protect the integrity =
of the<br>
=C2=A0 =C2=A0messages by public key signatures.=C2=A0 For a more advanced<b=
r>
=C2=A0 =C2=A0authentication mechanism, a distributed blockchain-based mecha=
nism<br>
=C2=A0 =C2=A0[Vehicular-BlockChain] can be used.<br>
<br>
&gt;&gt;&gt; solution space. Again, the draft should focus on problems and =
needs. The<br>
problem here is that SEND is complex, and not implemented in the major stac=
k.<br>
It relies on PKI for trusting the router. The V2I need is a zerotrust model=
<br>
where one V, the other local Vs, and the I, can help each other anonymously=
 and<br>
harmlessly. &lt;snip&gt;<br>
<br>
8.=C2=A0 Informative References<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&lt;snip&gt;<br>
<br>
Voila!<br>
<br>
Keep safe;<br>
<br>
Pascal<br>
<br>
<br>
<br>
_______________________________________________<br>
its mailing list<br>
<a href=3D"mailto:its@ietf.org" target=3D"_blank">its@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/its" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/its</a><u></u><u></u></span></font></p>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>

</blockquote></div></div>-- <br><div dir=3D"ltr" class=3D"gmail_signature" =
data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><=
div><div dir=3D"ltr"><div><div dir=3D"ltr">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Mr. Jaehoon (Paul) J=
eong, Ph.D.<br>Associate Professor</div><div dir=3D"ltr">Department Head<br=
>Department of Computer Science and Engineering<br>Sungkyunkwan University<=
br>Office: +82-31-299-4957<br>Email: <a href=3D"mailto:pauljeong@skku.edu" =
style=3D"font-size:12.8px" target=3D"_blank">pauljeong@skku.edu</a>,=C2=A0<=
a href=3D"mailto:jaehoon.paul@gmail.com" target=3D"_blank">jaehoon.paul@gma=
il.com</a><br>Personal Homepage: <a href=3D"http://cpslab.skku.edu/people-j=
aehoon-jeong.php" target=3D"_blank">http://iotlab.skku.edu/people-jaehoon-j=
eong.php</a><br></div></div></div></div></div></div></div></div>

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Cc: int-dir@ietf.org, Last Call <last-call@ietf.org>,  draft-ietf-ipwave-vehicular-networking.all@ietf.org, its@ietf.org,  Russ Housley <housley@vigilsec.com>, CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es>,  skku-iotlab-members <skku-iotlab-members@googlegroups.com>, Chris Shen <shenyiwen7@gmail.com>,  "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
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Hi Pascal,
Here is the revision (-21) of IPWAVE PS Draft:
https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networkin=
g-21

I attach the revision letter to show how I have addressed your comments on
the revision.

Chris and I have worked for this revision together.

If you have further comments, please let me know.

Thanks.

Best Regards,
Paul



On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert via Datatracker <
noreply@ietf.org> wrote:

> Reviewer: Pascal Thubert
> Review result: Not Ready
>
> Dear authors
>
> In summary:
>
> I read a number of very good drafts collated in one, from the use cases
> that
> very complete and ready to publish, to the architecture and protocol
> solution
> in section 4 that would require more work for completeness.
>
> There are multiple instances in the use cases where protocols are listed
> coming
> out of the blue, e.g., the references to OMNI that seem artificially spre=
ad
> regardless of the context of the section. OMNI is used throughout, both a=
s
> an
> open ended toolbox, and as a carpet under which all problems can be hidde=
n.
>
> Reading this doc, OMNI shows as an interface to a software mobile router,
> with
> multiple of the device physical interfaces connected to the mobile router=
.
> This
> makes the stack very simple as the complexity moves to the router. But no=
w
> you
> have to implement the router. Presented as that, the OMNI router deserves
> its
> name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANET=
 (many to
> choose from) and NEMO (and all the MIP protocol family across address
> families), all the possible radio interfaces on which the ND problems go
> away
> by magic, and whatever else you want to put in there. Is that the
> intention?
>
> Instead of referring to OMNI for virtually anything, the doc should refer
> to
> MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),
> draft-nordmark-intarea-ippl for split subnets, and
> draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet
> models. And
> then you can say that all those components can be plugged in the OMNI
> router,
> and you can discuss which MANET and which MIP you want, including using
> OMNI=E2=80=99s
> built in mobility.
>
> Note that my objections are not against the OMNI design, it might be the
> perfect thing and I am already aware of use cases that could be served by=
 a
> P2MP interface like OMNI in conjunction with RFC8505 on the P2P
> subinterfaces
> (recycling the high level design we=E2=80=99ve been shipping for IPv4 / f=
rame
> relay for
> the last 30 years). My objection is of the way the draft uses [OMNI] as t=
he
> magic wand that solves all the problems when what you really do is throw
> them
> over the fence. I=E2=80=99d rather you focus on problems and use cases, f=
or which
> there=E2=80=99s excellent text, and indicate what needs to be done withou=
t making
> assumption on how the needful things will be solved.
>
> In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to s=
plit,
> keep all
> that=E2=80=99s use case and problem description and ship it, remove refer=
ences to
> protocols envisioned in the solution, and start the work on architecture
> of the
> solution and the protocol applicability statements separately. An alterna=
te
> would be to centralize the discussion on protocols to annex, and explain
> that
> protocol A or B could be envisioned in solution space because to over thi=
s
> gap
> or implement that function.
>
> In any fashion, the current text is not ready for publication as
> applicability
> statement, architecture and or/solution, so the related work should be
> removed
> from the main text. But I find it mostly ready for use case and problem
> statement, more below.
>
> Review:
>
> Abstract
>
>    This document discusses the problem statement and use cases of
>    IPv6-based vehicular networking for Intelligent Transportation
>    Systems (ITS).
>
> >>> The document goes beyond that; there was actually a thread at 6MAN
> where
> Bob Hinden said =E2=80=9C This document says it is a problem statement, b=
ut then
> becomes a solution document.   Might be better to cut it down to only the
> problem statement part. =E2=80=9C >>> Would you consider doing this? If n=
ot, why?
> Note:
> you may want to respond on 6MAN as well. >>> >>>I would have thought that
> the
> traditional steps of problem statement and applicability statement of
> existing
> work could be expected from IPWAVE too. >>> Please clarify the steps that
> you
> intend to follow next with this work.
>
> <snip>
>
> 1.  Introduction
>
> >>> Very readable and informative section, many thanks!
>
>    Along with these WAVE standards and C-V2X standards, regardless of a
>    wireless access technology under the IP stack of a vehicle, vehicular
>    networks can operate IP mobility with IPv6 [RFC8200] and Mobile IPv6
>    protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (PMIPv6)
>    [RFC5213], Distributed Mobility Management (DMM) [RFC7333], Locator/
>    ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Extended
>    Route Optimization (AERO) [RFC6706BIS]).
>
> >>> NEMO (RFC 3963) is not cited. Any reason why the vehicle would not
> transport a network?
>
> <snip>
>
>    This document describes use cases and a problem statement about
>    IPv6-based vehicular networking for ITS, which is named IPv6 Wireless
>    Access in Vehicular Environments (IPWAVE).  First, it introduces the
>    use cases for using V2V, V2I, and V2X networking in ITS.  Next, for
>    IPv6-based vehicular networks, it makes a gap analysis of current
>    IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Management,
>    and Security & Privacy), and then enumerates requirements for the
>    extensions of those IPv6 protocols, which are tailored to IPv6-based
>    vehicular networking.  Thus, this document is intended to motivate
>    development of key protocols for IPWAVE.
>
> >>>
>
> <snip>
>
> 2.  Terminology
>
> >>>
>
> <snip>
>
>    o  IP-OBU: "Internet Protocol On-Board Unit": An IP-OBU denotes a
>       computer situated in a vehicle (e.g., car, bicycle, autobike,
>       motor cycle, and a similar one) and a device (e.g., smartphone and
>       IoT device).  It has at least one IP interface that runs in IEEE
>       802.11-OCB and has an "OBU" transceiver.  Also, it may have an IP
>       interface that runs in Cellular V2X (C-V2X) [TS-23.285-3GPP]
>       [TR-22.886-3GPP][TS-23.287-3GPP].  See the definition of the term
>       "OBU" in [RFC8691].
>
> >>> Can that be a router connecting multiple computers?
>
> <snip>
>
> 3.  Use Cases
>
> >>> This is another great read and an enlightening section. Maybe mention
> in
> the abstract that the doc also covers use cases?
>
> <snip>
>
>    Although a Layer-2 solution can provide a support for multihop
>    communications in vehicular networks, the scalability issue related
>    to multihop forwarding still remains when vehicles need to
>    disseminate or forward packets toward multihop-away destinations.  In
>    addition, the IPv6-based approach for V2V as a network layer protocol
>    can accommodate multiple radio technologies as MAC protocols, such as
>    5G V2X and DSRC.  Therefore, the existing IPv6 protocol can be
>    augmented through the addition of an Overlay Multilink Network (OMNI)
>    Interface [OMNI] and/or protocol changes in order to support both
>    wireless single-hop/multihop V2V communications and multiple radio
>    technologies in vehicular networks.  In such a way, vehicles can
>    communicate with each other by V2V communications to share either an
>    emergency situation or road hazard in a highway having multiple kinds
>    of radio technologies, such as 5G V2X and DSRC.
>
> >>> This text appears in the middle of high level use case, with a crude
> list
> of protocols; this is not a place for it
>
> >>> On a 6MAN Thread, Brian Carpenter said that the above:
> =E2=80=9C
> is of concern regardless of the mention of OMNI. Does it mean "can be" or
> "needs to be"? This paragraph seems like a very short summary of a big
> problem
> area. At the end of page 13 there is some related discussion, which
> mentions
> RPL as part of the solution (good choice, IMHO) but again seems to depend
> on
> OMNI. I don't think the fix of simply removing references to OMNI works,
> because it would leave a gap. In an informational document, that is not a
> formal problem but as far as this draft describes architecture, I don't
> think
> that big a gap is reasonable. "OMNI" is mentioned more than 20 times in t=
he
> document. There are also several references to AERO, which is strongly
> associated with OMNI. =E2=80=9C >>> I agree with Brian. Here the document=
 seems to
> be
> mixing solution with problem and putting the cart before the horse. My
> recommendation is to stick to what needs to be done that IPv6 does not do
> yet
> -the reqs and gaps-; but the doc should not step in the how things will b=
e
> done
> unless the group already decided to do it. The logical next steps to a PS
> are
> an applicability statement of existing work, and if the gaps cannot be
> filled,
> there may be one or more WG chartered to fill those gaps.
>
> >>> I=E2=80=99d still be happy to see an annex with leads on where the so=
lution
> might
> come from like RFC 8691 does.
>
> <snip>
>
>    The existing IPv6 protocol must be augmented through the addition of
>    an OMNI interface and/or protocol changes in order to support
>    wireless multihop V2I communications in a highway where RSUs are
>    sparsely deployed, so a vehicle can reach the wireless coverage of an
>    RSU through the multihop data forwarding of intermediate vehicles.
>    Thus, IPv6 needs to be extended for multihop V2I communications.
>
> >>> Note that I have no clue on how well OMNI applies in that space, mayb=
e
> it
> does very well; but here it comes out of the blue with no justification.
> If you
> mention OMNI you need to detail what it is and which of the V2V  problems
> you
> expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.
>
> <snip>
>
>    The existing IPv6 protocol must be augmented through the addition of
>    an OMNI interface and/or protocol changes in order to support
>    wireless multihop V2X (or V2I2X) communications in an urban road
>    network where RSUs are deployed at intersections, so a vehicle (or a
>    pedestrian's smartphone) can reach the wireless coverage of an RSU
>    through the multihop data forwarding of intermediate vehicles (or
>    pedestrians' smartphones).  Thus, IPv6 needs to be extended for
>    multihop V2X (or V2I2X) communications.
>
> >>> Please be more specific on what the missing functions are and whether
> they
> are missing from the stack development standpoint or if there=E2=80=99s w=
ork needed
> from the IETF. 1)      If something is really missing in our specs, the
> text to
> prove from the use case above is missing 2)      how OMNI serves the use
> case
> could be elaborated in an applicability statement of OMNI for V2xyz, but
> it is
> a bit blunt to present it as panacea when the problems to be solved are n=
ot
> listed. 3)      If you look at it, OMNI seems like a software mobile rout=
er
> within a bump in the stack. Can that become too big?
>
> >>> my view is that the text above and the similar occasions should be
> replaced
> by something like :
>
>    The existing IPv6 protocol must be augmented to provide the following
>    functions: 1) =E2=80=A6
>
> >>> and / or something like:
>
>    In addition to the IPv6 node requirements [RFC 8504], the IPv6 protoco=
l
>    stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=A6
>
> <snip>
>
>    To support applications of these V2X use cases, the functions of IPv6
>    such as VND, VMM, and VSP are prerequisites for IPv6-based packet
>    exchange, transport-layer session continuity, and secure, safe
>    communication between a vehicle and a pedestrian either directly or
>    indirectly via an IP-RSU.
>
> >>> =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=9D doe=
s not parse.
> There=E2=80=99s
> no IPv6 reference that provides those functions. If the intention is to s=
ay
> that there=E2=80=99s stuff to add to IPv6 to support, like, say,  VND, th=
en this
> document fails to define how an IPv6 VND should behave, though it=E2=80=
=99s
> precisely
> what I=E2=80=99d expect from a problem statement.
>
> <snip>
>
> 4.  Vehicular Networks
>
> >>> What is the purpose of section 4 as a whole, problem statement or
> applicability statement of the listed protocols? In the former case what=
=E2=80=99s
> the
> problem? In the latter case it is incomplete and needs to be exported to =
an
> applicability statement doc with all the possible technologies evaluated.
>
>    This section describes an example vehicular network architecture
>    supporting V2V, V2I, and V2X communications in vehicular networks.
>
> >>> I read this as presenting a context to explain what the problems are
> instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe us=
ing the term
> =E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=99=
s comment.
>
> <snip>
>
> 4.1.  Vehicular Network Architecture
>
>    Figure 1 shows an example vehicular network architecture for V2I and
>    V2V in a road network [OMNI].
>
> a.      Is using OMNI a decision that the WG made for the future work ?
> what
> does it do and what does it not do? b.      Is there work left to be done=
?
> Who
> will do that work? Or is it the expectation that OMNI has it all defined
> already?
>
> <snip>
>
>    An existing network architecture (e.g., an IP-based aeronautical
>    network architecture [OMNI][UAM-ITS], a network architecture of
>    PMIPv6 [RFC5213], and a low-power and lossy network architecture
>    [RFC6550]) can be extended to a vehicular network architecture for
>    multihop V2V, V2I, and V2X, as shown in Figure 1.  In a highway
>    scenario, a vehicle may not access an RSU directly because of the
>    distance of the DSRC coverage (up to 1 km).  For example, the OMNI
>    interface and/or RPL (IPv6 Routing Protocol for Low-Power and Lossy
>    Networks) [RFC6550] can be extended to support a multihop V2I since a
>    vehicle can take advantage of other vehicles as relay nodes to reach
>    the RSU.  Also, RPL can be extended to support both multihop V2V and
>    V2X in the similar way.
>
> >>> all this could fit well in annex; anyway you need to explain what you
> expect the protocols to do and which extension is needed. In the case of
> RPL at
> least you indicate that it would do routing, but not why you cannot use i=
t
> of
> the shelf; for OMNI, what you expect is less clear, though there=E2=80=99=
s text
> elsewhere about the many radio interfaces that could be used for the
> purpose,
> and the text in the UAM below that is enlightening.
>
> <snip>
>
>                                   To support not only the mobility
>    management of the UAM end systems, but also the multihop and
>    multilink communications of the UAM interfaces, the UAM end systems
>    can employ an Overlay Multilink Network (OMNI) interface [OMNI] as a
>    virtual Non-Broadcast Multiple Access (NBMA) connection to a serving
>    ground domain infrastructure.
>
> >>> Again, what is the expectation for OMNI? As an overlay it requires an
> underlay; when connecting to a MANET it needs support for that MANET. The
> text
> above seems to imply that is solves everything in V2xyz like magic;
> reminds me
> of the IPv6 multicast abstraction that was supposed to solve the broadcas=
t
> problem and ended up worsening it.
>
> <snip>
>
>                             This infrastructure can be configured
>    over the underlying data links.  The OMNI interface and its link
>    model provide a means of multilink, multihop and mobility
>    coordination to the legacy IPv6 ND messaging [RFC4861] according to
>    the NBMA principle.  Thus, the OMNI link model can support efficient
>    UAM internetworking services without additional mobility messaging,
>    and without any modification to the IPv6 ND messaging services or
>    link model.
>
> >>> Again, what is the expectation for OMNI? As an overlay it requires an
> underlay; the text above seems to imply that is solves everything in V2xy=
z
> like
> magic; that would be a stretch, that reminds me of IPv6 multicast that wa=
s
> supposed to solve the broadcast problem and ended up worsening it.
>
> <snip>
>
>    Multiple vehicles under the coverage of an RSU share a prefix just as
>    mobile nodes share a prefix of a Wi-Fi access point in a wireless
>    LAN.  This is a natural characteristic in infrastructure-based
>    wireless networks.  For example, in Figure 1, two vehicles (i.e.,
>    Vehicle2, and Vehicle5) can use Prefix 1 to configure their IPv6
>    global addresses for V2I communication.  Alternatively, mobile nodes
>    can employ an OMNI interface and use their own IPv6 Unique Local
>    Addresses (ULAs) [RFC4193] over the wireless network without
>    requiring the messaging of IPv6 Stateless Address Autoconfiguration
>   (SLAAC) [RFC4862], which uses an on-link prefix provided by the
>    (visited) wireless LAN; this technique is known as "Bring-Your-Own-
>    Addresses".
>
> >>>  Is OMNI the only way to "Bring-Your-Own-Addresses=E2=80=9D? Else the=
 text
> could be
> more generic, at least use e.g., like the ref to AERO later. >>> What are
> the
> implications / limitations of doing that =E2=80=93 like they can do line =
of sight
> V2V
> but not reach the internet, or the need of  a local MANET / RPL that will
> accept to route those addresses, or the security / address ownership
> validation
> issues ?
>
> <snip>
>
>    A single subnet prefix announced by an RSU can span multiple vehicles
>    in VANET.  For example, in Figure 1, for Prefix 1, three vehicles
>    (i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a connected
>    VANET.  Also, for Prefix 2, two vehicles (i.e., Vehicle3 and
>    Vehicle6) can construct another connected VANET, and for Prefix 3,
>    two vehicles (i.e., Vehicle4 and Vehicle7) can construct another
>    connected VANET.  Alternatively, each vehicle could employ an OMNI
>    interface with their own ULAs such that no topologically-oriented
>    subnet prefixes need be announced by the RSU.
>
> >>>  same as above. This seems to restate the same thing, derive an addre=
ss
> from a topologically correct prefix or use your own with limitations to b=
e
> described.
>
> <snip>
>
>    For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]
>    specifies several details, including Maximum Transmission Unit (MTU),
>    frame format, link-local address, address mapping for unicast and
>    multicast, stateless autoconfiguration, and subnet structure.  An
>    Ethernet Adaptation (EA) layer is in charge of transforming some
>    parameters between the IEEE 802.11 MAC layer and the IPv6 network
>    layer, which is located between the IEEE 802.11-OCB's logical link
>    control layer and the IPv6 network layer.  This IPv6 over 802.11-OCB
>    can be used for both V2V and V2I in IPv6-based vehicular networks.
>
> >>>  solution space.
>
> <snip>
>
>    An IPv6 mobility solution is needed for the guarantee of
>    communication continuity in vehicular networks so that a vehicle's
>    TCP session can be continued, or UDP packets can be delivered to a
>    vehicle as a destination without loss while it moves from an IP-RSU's
>    wireless coverage to another IP-RSU's wireless coverage.  In
>    Figure 1, assuming that Vehicle2 has a TCP session (or a UDP session)
>    with a corresponding node in the vehicular cloud, Vehicle2 can move
>    from IP-RSU1's wireless coverage to IP-RSU2's wireless coverage.  In
>    this case, a handover for Vehicle2 needs to be performed by either a
>    host-based mobility management scheme (e.g., MIPv6 [RFC6275]) or a
>    network-based mobility management scheme (e.g., PMIPv6 [RFC5213] and
>    AERO [RFC6706BIS]).
>
>    In the host-based mobility scheme (e.g., MIPv6), an IP-RSU plays a
>    role of a home agent.  On the other hand, in the network-based
>    mobility scheme (e.g., PMIPv6, an MA plays a role of a mobility
>    management controller such as a Local Mobility Anchor (LMA) in
>    PMIPv6, which also serves vehicles as a home agent, and an IP-RSU
>    plays a role of an access router such as a Mobile Access Gateway
>    (MAG) in PMIPv6 [RFC5213].  The host-based mobility scheme needs
>    client functionality in IPv6 stack of a vehicle as a mobile node for
>    mobility signaling message exchange between the vehicle and home
>    agent.  On the other hand, the network-based mobility scheme does not
>    need such a client functionality for a vehicle because the network
>    infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility agent
>    handles the mobility signaling message exchange with the home agent
>    (e.g., LMA in PMIPv6) for the sake of the vehicle.
>
>    There are a scalability issue and a route optimization issue in the
>    network-based mobility scheme (e.g., PMIPv6) when an MA covers a
>    large vehicular network governing many IP-RSUs.  In this case, a
>    distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate the
>    scalability issue by distributing multiple MAs in the vehicular
>    network such that they are positioned closer to vehicles for route
>    optimization and bottleneck mitigation in a central MA in the
>    network-based mobility scheme.  All these mobility approaches (i.e.,
>    a host-based mobility scheme, network-based mobility scheme, and
>    distributed mobility scheme) and a hybrid approach of a combination
>    of them need to provide an efficient mobility service to vehicles
>    moving fast and moving along with the relatively predictable
>    trajectories along the roadways.
>
>    In vehicular networks, the control plane can be separated from the
>    data plane for efficient mobility management and data forwarding by
>    using the concept of Software-Defined Networking (SDN)
>    [RFC7149][DMM-FPC].  Note that Forwarding Policy Configuration (FPC)
>    in [DMM-FPC], which is a flexible mobility management system, can
>    manage the separation of data-plane and control-plane in DMM.  In
>    SDN, the control plane and data plane are separated for the efficient
>    management of forwarding elements (e.g., switches and routers) where
>    an SDN controller configures the forwarding elements in a centralized
>    way and they perform packet forwarding according to their forwarding
>    tables that are configured by the SDN controller.  An MA as an SDN
>    controller needs to efficiently configure and monitor its IP-RSUs and
>    vehicles for mobility management, location management, and security
>    services.
>
>    The mobility information of a GPS receiver mounted in its vehicle
>    (e.g., position, speed, and direction) can be used to accommodate
>    mobility-aware proactive handover schemes, which can perform the
>    handover of a vehicle according to its mobility and the wireless
>    signal strength of a vehicle and an IP-RSU in a proactive way.
>
>    Vehicles can use the TCC as their Home Network having a home agent
>    for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5213],
>    so the TCC (or an MA inside the TCC) maintains the mobility
>    information of vehicles for location management.  IP tunneling over
>    the wireless link should be avoided for performance efficiency.
>    Also, in vehicular networks, asymmetric links sometimes exist and
>    must be considered for wireless communications such as V2V and V2I.
>
> >>>  This is all very informative text but does not state a problem. Is
> there a
> problem is left to be solved or are we assessing the applicability of
> protocols? Could it for instance, forward point to issues discussed in
> section
> 5?
>
> <snip>
>
>    As shown in Figure 3, as internal networks, a vehicle's moving
>    network and an EN's fixed network are self-contained networks having
>    multiple subnets and having an edge router (e.g., IP-OBU and IP-RSU)
>    for the communication with another vehicle or another EN.  The
>    internetworking between two internal networks via V2I communication
>    requires the exchange of the network parameters and the network
>    prefixes of the internal networks.  For the efficiency, the network
>    prefixes of the internal networks (as a moving network) in a vehicle
>    need to be delegated and configured automatically.  Note that a
>    moving network's network prefix can be called a Mobile Network Prefix
>    (MNP) [OMNI].
>
> >>> Then again you=E2=80=99re overselling OMNI. MNP is originally defined=
 here
> https://datatracker.ietf.org/doc/html/rfc3963#section-2 and that=E2=80=99=
s a
> reference
> you can use normatively.
>
> <snip>
>
>    As shown in Figure 3, the addresses used for IPv6 transmissions over
>    the wireless link interfaces for IP-OBU and IP-RSU can be either
>    global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets can be
>    routed within vehicular networks [OMNI].
>
> >>> Then again you=E2=80=99re overselling OMNI. There needs to  be a rout=
ing
> protocol
> like a MANET that will accept to carry the
>  MNPs, and that must be implemented by the infra and both cars. The OMNI
> spec
>  is clear on that. This is why at first glance I see OMNI as a full mobil=
e
>  router in a bump in the stack. Now what is the problem behind this? No
> such
>  protocol at IETF? Too many to choose from? No deployment?
> <snip>
>
> When global IPv6 addresses
>    are used, wireless interface configuration and control overhead for
>    Duplicate Address Detection (DAD) [RFC4862] and Multicast Listener
>    Discovery (MLD) [RFC2710][RFC3810] should be minimized to support V2I
>    and V2X communications for vehicles moving fast along roadways; when
>    ULAs and the OMNI interface are used, no DAD nor MLD messaging is
>    needed.
>
> >>> Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it the no d=
ad needed a
> property
> of injecting a BYOA in the fabric for an GUA MIP Home Address which is
> known to
> be unique at home? >>> OTOH, autoconf=E2=80=99ing a random ULA =E2=80=9CF=
D=E2=80=A6=E2=80=9Dprefix has
> lesser
> DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classica=
l subnet.
> So
> who says DAD isn=E2=80=99t required for OMNI ULA? >>> note that IMHO DAD =
on
> wireless is
> a lot more harm than good, and I agree that with a good pseudo random
> generator
> the ULA has no chance to collision in the real world, as OMNI claims. It=
=E2=80=99s
> just
> that your argument here plays the other way, because there are less rando=
m
> bits
> (56)  in the ULA prefix than in the IID (62), and if one starts using mor=
e
> prefix bits to be non-random, there will be a time when DAD on prefix is
> needed.
>
> <snip>
>
>    Let us consider the upload/download time of a vehicle when it passes
>    through the wireless communication coverage of an IP-RSU.  For a
>    given typical setting where 1km is the maximum DSRC communication
>    range [DSRC] and 100km/h is the speed limit in highway, the dwelling
>    time can be calculated to be 72 seconds by dividing the diameter of
>    the 2km (i.e., two times of DSRC communication range where an IP-RSU
>    is located in the center of the circle of wireless communication) by
>    the speed limit of 100km/h (i.e., about 28m/s).  For the 72 seconds,
>    a vehicle passing through the coverage of an IP-RSU can upload and
>    download data packets to/from the IP-RSU.
>
> <snip>
>
> 4.3.  V2V-based Internetworking
>
> >>> In this section it looks like the cars are in a stable line of sight
> relationship. Which is probably fine for a platoon, but when you drive
> along
> with friends in different cars, you realize that the line of sight
> assumption
> does not stand over time. Soon enough, other cars meddle in, and possibly
> one
> of the cars drives faster and too far ahead so you need the infra to rela=
y,
> possibly over multiple infra hops.
>
> >>> so in this section, I=E2=80=99d expect to see a Vehicle communicating=
 with
> another
> one and using either line of sight or V2V relaying but also using relay
> via V2I
> (multihop I2I not just hub and spoke V2I2V ), alternatively to together f=
or
> redundancy. Is that part of the problem?
>
> >>> reading deeper section 5 I found excellent text on routing via V and
> via I.
> This tells that section 4 does not play a good role at justifying section
> 5.
> Maybe keep section 4 for another doc?
>
> >>> What kind or reliability is required in a V2V use case? Do you think
> ND can
> handle it? Or MANET? What would be the assumption on L2 (roaming time,
> unicast
> vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3
> redundancy?
>
> <snip>
>
> 5.  Problem Statement
>
> <snip>
>
>    In order to specify protocols using the architecture mentioned in
>    Section 4.1, IPv6 core protocols have to be adapted to overcome
>    certain challenging aspects of vehicular networking.  Since the
>    vehicles are likely to be moving at great speed, protocol exchanges
>    need to be completed in a time relatively short compared to the
>    lifetime of a link between a vehicle and an IP-RSU, or between two
>    vehicles.
>
> >>> Any order of magnitude?
> >>> Can you indicate whether this already rules out certain procedures,
> e.g.
> DAD ?
>
>    The lifetime of a session varies depending on the session's type such
>    as a web surfing, voice call over IP, and DNS query.  Regardless of a
>    session's type, to guide all the IPv6 packets to their destination
>    host, IP mobility should be supported for the session.
>
> >>> this seems to be for unicast when you know who to talk to. Is there a
> need
> some multicast groups like anybody around interested in topic blah like I
> could
> be multicasting the speed of vehicles coming the other way that I crossed
> recently, for use of vehicles that I=E2=80=99m crossing now, so they can =
see a
> slowdown
> on advance
>
>    Thus, the time constraint of a wireless link has a major impact on
>    IPv6 Neighbor Discovery (ND).  Mobility Management (MM) is also
>    vulnerable to disconnections that occur before the completion of
>    identity verification and tunnel management.  This is especially true
>    given the unreliable nature of wireless communication.  This section
>    presents key topics such as neighbor discovery and mobility
>    management.
>
> >>> Only ND? What about the MANET?
> >>> how fast should ND be to be suitable?
> >>> is there also a bandwidth check? You can make things much faster if y=
ou
> dedicate a lot of spectrum to it. But that can also be a waste.
>
> 5.1.  Neighbor Discovery
>
> <snip>
>
>    The requirements for IPv6 ND for vehicular networks are efficient DAD
>    and NUD operations.
>
> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast,
> which
> is a good idea in my book?
>
>  <snip>
>
>       This merging and partitioning should be considered for the
>    IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAAC)
>    [RFC4862].
>
> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast,
> which
> is a good idea in my book?
>
>  <snip>
>
>    Also, the partitioning of a VANET may make vehicles with the same
>    prefix be physically unreachable.  Also, SLAAC needs to prevent IPv6
>    address duplication due to the merging of VANETs.  According to the
>    merging and partitioning, a destination vehicle (as an IPv6 host)
>    needs to be distinguished as either an on-link host or an off-link
>    host even though the source vehicle uses the same prefix as the
>    destination vehicle.
>
> >>> should reference to draft-nordmark-intarea-ippl
>
>    To efficiently prevent IPv6 address duplication due to the VANET
>    partitioning and merging from happening in vehicular networks, the
>    vehicular networks need to support a vehicular-network-wide DAD by
>    defining a scope that is compatible with the legacy DAD.  In this
>    case, two vehicles can communicate with each other when there exists
>    a communication path over VANET or a combination of VANETs and IP-
>    RSUs, as shown in Figure 1.  By using the vehicular-network-wide DAD,
>    vehicles can assure that their IPv6 addresses are unique in the
>    vehicular network whenever they are connected to the vehicular
>    infrastructure or become disconnected from it in the form of VANET.
>
> >>> Excellent
>
>    ND time-related parameters such as router lifetime and Neighbor
>    Advertisement (NA) interval need to be adjusted for vehicle speed and
>    vehicle density.  For example, the NA interval needs to be
>    dynamically adjusted according to a vehicle's speed so that the
>    vehicle can maintain its neighboring vehicles in a stable way,
>    considering the collision probability with the NA messages sent by
>    other vehicles.
>
> >>> Is that a problem or just an operational setting that needs to be
> found?
> >>> Do we need to reconsider the concepts of those timers?
>
> <snip>
>
>    Thus, in IPv6-based vehicular networking, IPv6 ND should have minimum
>    changes for the interoperability with the legacy IPv6 ND used in the
>    Internet, including the DAD and NUD operations.
>
> >>> I do not find the logical link with the text before, why is this a
> =E2=80=9Cthus=E2=80=9D?
> >>> why should the ND inside the VANET be constrained to be interoperable=
?
> This
> may place constraints on the solution.
>
> 5.1.1.  Link Model
>
>    A prefix model for a vehicular network needs to facilitate the
>
> >>> Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=80=9Cp=
refix model=E2=80=9D.
> >>> it would make this piece and the next should refer to
> draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both
> link
> and subnet issues. The general ideas are the same, but the gory details
> here
> are slightly incorrect, like this notion of prefix model than comes out o=
f
> the
> blue. The model is really the subnet model for the subnet associated to
> P2MP.
>
>    communication between two vehicles with the same prefix regardless of
>    the vehicular network topology as long as there exist bidirectional
>    E2E paths between them in the vehicular network including VANETs and
>    IP-RSUs.  This prefix model allows vehicles with the same prefix to
>    communicate with each other via a combination of multihop V2V and
>    multihop V2I with VANETs and IP-RSUs.  Note that the OMNI interface
>    supports an NBMA link model where multihop V2V and V2I communications
>    use each mobile node's ULAs without need for any DAD or MLD
>    messaging.
>
> >>> again overselling OMNI.
> >>> I kinda agree about the OMNI interface model, nothing against that.
> But you
> must see that there needs a lot more than what the OMNI interface to get
> packets across V and I hops to the destination. Like routing ala MANET,
> redundancy handling ala DetNet because it will be very lossy, path
> management
> ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND so=
 it does
> not
> solve the ND problems above.
>
>    IPv6 protocols work under certain assumptions that do not necessarily
>    hold for vehicular wireless access link types other than OMNI/NBMA
>    [VIP-WAVE][RFC5889]; the rest of this section discusses implications
>    for those link types that do not apply when the OMNI/NBMA link model
>
> >>> again overselling OMNI.
> >>> The keyword here is P2MP / NBMA, and OMNI is one interface that accep=
ts
> that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already P=
2MP /
> NBMA,
> using routing to complete the partial mesh in P2MP. The text seems to imp=
ly
> that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI =
is loaded
> with
> other stuff than a plain P2MP capable interface. And ND over P2MP is not
> done
> by OMNI, OMNI only makes classical ND worse and only works in a full mesh=
.
> OTOH
> RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work ver=
y
> well
> within an OMNI interface and solve those problems. >>> My point is that y=
ou
> need to tell the full story or refrain from entering solution space in
> this doc
>
> <snip>
>
>    There is a relationship between a link and a prefix, besides the
>    different scopes that are expected from the link-local and global
>    types of IPv6 addresses.  In an IPv6 link, it is assumed that all
>    interfaces which are configured with the same subnet prefix and with
>    on-link bit set can communicate with each other on an IPv6 link.
>
> >>> not assumed; that=E2=80=99s what the onlink but set tells. The conclu=
sion
> should be
> that the VANET cannot set the O bit.
>
>    However, the vehicular link model needs to define the relationship
>    between a link and a prefix, considering the dynamics of wireless
>    links and the characteristics of VANET.
>
> <snip>
>
>    From the previous observation, a vehicular link model should consider
>    the frequent partitioning and merging of VANETs due to vehicle
>    mobility.  Therefore, the vehicular link model needs to use an on-
>    link prefix and off-link prefix according to the network topology of
>    vehicles such as a one-hop reachable network and a multihop reachable
>
> >>> No, the once a node saw a O bit set that sticks even if it sees other
> advertisements of the PIO with the O bit not set. >>> This is a global an=
d
> intrinsic property of the prefix (and an attack vector that could be
> mentioned
> in the sec section). >>> the VANET prefix must never come with the O bit
> set.
>
> <snip>
>
>    network (or partitioned networks).  If the vehicles with the same
>    prefix are reachable from each other in one hop, the prefix should be
>    on-link.
>
> >>>> No, see above; but the router may redirect though it is really risky
> unless this is a stable situation like a parking place.
>
>    Thus, in IPv6-based vehicular networking, the vehicular link model
>    should have minimum changes for interoperability with standard IPv6
>    links in an efficient fashion to support IPv6 DAD, MLD and NUD
>    operations.  When the OMNI NBMA link model is used, there are no link
>    model changes nor DAD/MLD messaging required.
>
> >>>> again overselling OMNI.
> >>>> You need a good P2MP subnet model with routing support when the mesh
> is
> partial. My company alone has been shipping million of nodes that build
> subnets
> of thousands, and that was done using IETF standards.
>
> <snip>
>
>    For vehicular networks with high mobility and density, the DAD needs
>    to be performed efficiently with minimum overhead so that the
>    vehicles can exchange a driving safety message (e.g., collision
>    avoidance and accident notification) with each other with a short
>    interval (e.g., 0.5 second) by a technical report from NHTSA
>    (National Highway Traffic Safety Administration) [NHTSA-ACAS-Report].
>    Such a driving safety message may include a vehicle's mobility
>    information (i.e., position, speed, direction, and acceleration/
>    deceleration).  The exchange interval of this message is 0.5 second,
>    which is required to allow a driver to avoid a rear-end crash from
>    another vehicle.
>
> >>> IPv6 over broadcast MAC (used to be called internet 0, 10+ years ago)
> solves that MAC issue since there is no MAC.
>
> 5.1.3.  Routing
>
>    For multihop V2V communications in either a VANET or VANETs via IP-
>    RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing protocol may
>    be required to support both unicast and multicast in the links of the
>    subnet with the same IPv6 prefix.  However, it will be costly to run
>    both vehicular ND and a vehicular ad hoc routing protocol in terms of
>    control traffic overhead [ID-Multicast-Problems].
>
> >>> we do that with IETF standards on battery operated devices already.
> Using
> RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve s=
een 30
> hops in
> meshes of thousands in the real world though it=E2=80=99s not the normal
> operational
> model, but can happen to maintain connectivity during the reboot of a
> root) and
> does not use broadcast. RPL was initially designed as a V2V2V protocol bu=
t
> found its market on the IoT. I=E2=80=99m sure the protocol would gladly c=
ome back
> to
> its roots.
>
>    A routing protocol for a VANET may cause redundant wireless frames in
>    the air to check the neighborhood of each vehicle and compute the
>    routing information in a VANET with a dynamic network topology
>    because the IPv6 ND is used to check the neighborhood of each
>    vehicle.  Thus, the vehicular routing needs to take advantage of the
>    IPv6 ND to minimize its control overhead.
>
> >>> A clean description of the interaction of RPL and RFC 8505 in our IoT
> networks. Note that the speed of the PHY in VANET balanced the instabilit=
y
> of
> the topology, and RPL still applies. Note also that RPL uses DV with a
> routing
> stretch in order to minimize the topology awareness that=E2=80=99s needed=
 in each
> node,
> which results in minimal signaling.
>
> 5.2.  Mobility Management
>
> <snip>
>
>    For a mobility management scheme in a shared link, where the wireless
>    subnets of multiple IP-RSUs share the same prefix, an efficient
>    vehicular-network-wide DAD is required.  If DHCPv6 is used to assign
>    a unique IPv6 address to each vehicle in this shared link,
>
> >>> I would not use the term link, or shared. Maybe shared link -> domain=
?
> <snip>
>
> the DAD is
>    not required.  On the other hand, for a mobility management scheme
>    with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] and OMNI
>    [OMNI]), DAD is not required because the IPv6 address of a vehicle's
>    external wireless interface is guaranteed to be unique.
>
> >>> again overselling OMNI
> >>> As I said earlier, this is wring there are (64*) more chances of a
> collision in OMNI prefixes than in IPv6 IIDs. >>> OMNI prefixes can
> collision,
> home addresses that are unique on a home network cannot. >>> Now if both
> the
> OMNI prefix and the IID are good randoms, then obviously, the chances of
> collisions round up to 0. >>> Collision is certainly not my worst fear.
>
>   There is a
>    tradeoff between the prefix usage efficiency and DAD overhead.  Thus,
>    the IPv6 address autoconfiguration for vehicular networks needs to
>    consider this tradeoff to support efficient mobility management.
>
> >>> This is way too superficial and hides the reality of things.
> - Using a VANET Infra prefix allows direct routability to the internet
> which
> BYOA does not since the BYOA is not topologically correct. Yes, it costs =
a
> DAD
> with classic ND, but it does not with RCF8505 and the draft fails to
> mention
> that. - A BYOA needs a tunnel home, and the node needs to know who is
> reachable
> inside the VANET and what is not to decide to tunnel or not; this is a
> difficult problem (vs. control place overhead) that is not discussed here=
.
>
> <snip>
>
>    For the case of a multihomed network, a vehicle can follow the first-
>    hop router selection rule described in [RFC8028].  That is, the
>    vehicle should select its default router for each prefix by
>    preferring the router that advertised the prefix.
>
> >>> Still router discovery (in and out) must be very fast. Thing of the R=
A
> intervale in MIPv6. Is that sufficient? Too expensive?
>
> <snip>
>
> 6.  Security Considerations
> >>> Any discussion on the security of classical ND and other operational
> issues
> (rfc6583) ?
>
> <snip>
>
>    Security and privacy are paramount in V2I, V2V, and V2X networking.
>    Vehicles and infrastructure must be authenticated in order to
>    participate in vehicular networking.  Also, in-vehicle devices (e.g.,
>    ECU) and a driver/passenger's mobile devices (e.g., smartphone and
>    tablet PC) in a vehicle need to communicate with other in-vehicle
>    devices and another driver/passenger's mobile devices in another
>    vehicle, or other servers behind an IP-RSU in a secure way.  Even
>    though a vehicle is perfectly authenticated and legitimate, it may be
>    hacked for running malicious applications to track and collect its
>    and other vehicles' information.  In this case, an attack mitigation
>    process may be required to reduce the aftermath of malicious
>    behaviors.
>
> >>> The section should mention that both with classical ND and BYOA,
> addresses
> can be impersonated, and RFC 8928 protects against that in both cases whi=
le
> maintaining privacy.
>
>    Even though vehicles can be authenticated with valid certificates by
>    an authentication server in the vehicular cloud, the authenticated
>
> >>> Is PKI feasible (deploying it in every car?). Is it fast enough? Is i=
t
> really what IPWAVE thinks vehicle should use????? >>> e.g. why would one
> need
> to authenticate to a V2I network? >>> from the text earlier in the doc, i=
t
> seemed that what you really want is access that is fast to join, capable =
of
> offering the reachability you want, anonymous, and innocuous (cars can no=
t
> harm
> one another).
>
>    vehicles may harm other vehicles, so their communication activities
>    need to be logged in either a central way through a logging server
>    (e.g., TCC) in the vehicular cloud or a distributed way (e.g.,
>    blockchain [Bitcoin]) along with other vehicles or infrastructure.
>    For the non-repudiation of the harmful activities of malicious nodes,
>    a blockchain technology can be used [Bitcoin].  Each message from a
>    vehicle can be treated as a transaction and the neighboring vehicles
>    can play the role of peers in a consensus method of a blockchain
>    [Bitcoin][Vehicular-BlockChain].  For a blockchain's efficient
>    consensus in vehicular networks having fast moving vehicles, a new
>    consensus algorithm needs to be developed or an existing consensus
>    algorithm needs to be enhanced.
>
> >>> solution space; better express the  security needs since this is a PS=
.
>
> <snip>
>
>    To identify malicious vehicles among vehicles, an authentication
>    method is required.
>
> >>> No. As said earlier a vehicle can be infected. You need
> innocuousness.which
> can come from things like isolation, zerotrust, and protocols that are
> difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 is
> protected by construction, anonymous, and fast.
>
> <snip>
>
>    For the setup of a secure channel over IPsec or TLS, the multihop V2I
>    communications over DSRC is required in a highway for the
>    authentication by involving multiple intermediate vehicles as relay
>    nodes toward an IP-RSU connected to an authentication server in the
>    vehicular cloud.  The V2I communications over 5G V2X (or LTE V2X) is
>    required to allow a vehicle to communicate directly with a gNodeB (or
>    eNodeB) connected to an authentication server in the vehicular cloud.
>
> >>> solution space. Instead, you could mention that setting up secured
> channels
> between cars that cross one another might not complete in time to
> establish the
> communication channel, and that the innocuousness must come from zerotrus=
t
> in
> the transactions between the cars.
>    For the IPv6 ND, the DAD is required to ensure the uniqueness of the
>    IPv6 address of a vehicle's wireless interface.
>
> >>> for classical ND (SLAAC) that=E2=80=99s true. That is not with RFC 85=
05, since
> the
> infra maintains a table of all addresses in use in the prefix and blocks
> duplicates without the RFC 4862 DAD method. The stateful autoconf address
> grant
> is immediate.
>
>                                This DAD can be used
>    as a flooding attack that uses the DAD-related ND packets
>    disseminated over the VANET or vehicular networks.
>
> >>> also for DOS attacks. You can block a owner from using an address. A
> reference to rfc6959 is much needed here.
>
> <snip>
>
>  This possibility
>    indicates that the vehicles and IP-RSUs need to filter out suspicious
>    ND traffic in advance.  Based on the SEND [RFC3971] mechanism, the
>    authentication for routers (i.e., IP-RSUs) can be conducted by only
>    selecting an IP-RSU that has a certification path toward trusted
>    parties.  For authenticating other vehicles, the cryptographically
>    generated address (CGA) can be used to verify the true owner of a
>    received ND message, which requires to use the CGA ND option in the
>    ND protocols.  For a general protection of the ND mechanism, the RSA
>    Signature ND option can also be used to protect the integrity of the
>    messages by public key signatures.  For a more advanced
>    authentication mechanism, a distributed blockchain-based mechanism
>    [Vehicular-BlockChain] can be used.
>
> >>> solution space. Again, the draft should focus on problems and needs.
> The
> problem here is that SEND is complex, and not implemented in the major
> stack.
> It relies on PKI for trusting the router. The V2I need is a zerotrust mod=
el
> where one V, the other local Vs, and the I, can help each other
> anonymously and
> harmlessly. <snip>
>
> 8.  Informative References
>
> >>> no normative reference?
>
> >>> no normative reference?
>
> <snip>
>
> Voila!
>
> Keep safe;
>
> Pascal
>
>
>
> _______________________________________________
> its mailing list
> its@ietf.org
> https://www.ietf.org/mailman/listinfo/its
>

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<div dir=3D"ltr">Hi Pascal,<div>Here is the revision (-21) of IPWAVE PS Dra=
ft:</div><div><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-i=
pwave-vehicular-networking-21">https://datatracker.ietf.org/doc/html/draft-=
ietf-ipwave-vehicular-networking-21</a><br></div><div><br></div><div>I atta=
ch the revision letter to show how I have addressed your comments on the re=
vision.</div><div><br></div><div>Chris and I have worked for this revision =
together.</div><div><br></div><div>If you have further comments, please let=
 me know.</div><div><br></div><div>Thanks.</div><div><br></div><div>Best Re=
gards,</div><div>Paul</div><div><br></div><div><br></div></div><br><div cla=
ss=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Jun 18, 20=
21 at 4:42 PM Pascal Thubert via Datatracker &lt;<a href=3D"mailto:noreply@=
ietf.org">noreply@ietf.org</a>&gt; wrote:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2=
04,204);padding-left:1ex">Reviewer: Pascal Thubert<br>
Review result: Not Ready<br>
<br>
Dear authors<br>
<br>
In summary:<br>
<br>
I read a number of very good drafts collated in one, from the use cases tha=
t<br>
very complete and ready to publish, to the architecture and protocol soluti=
on<br>
in section 4 that would require more work for completeness.<br>
<br>
There are multiple instances in the use cases where protocols are listed co=
ming<br>
out of the blue, e.g., the references to OMNI that seem artificially spread=
<br>
regardless of the context of the section. OMNI is used throughout, both as =
an<br>
open ended toolbox, and as a carpet under which all problems can be hidden.=
<br>
<br>
Reading this doc, OMNI shows as an interface to a software mobile router, w=
ith<br>
multiple of the device physical interfaces connected to the mobile router. =
This<br>
makes the stack very simple as the complexity moves to the router. But now =
you<br>
have to implement the router. Presented as that, the OMNI router deserves i=
ts<br>
name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANET (=
many to<br>
choose from) and NEMO (and all the MIP protocol family across address<br>
families), all the possible radio interfaces on which the ND problems go aw=
ay<br>
by magic, and whatever else you want to put in there. Is that the intention=
?<br>
<br>
Instead of referring to OMNI for virtually anything, the doc should refer t=
o<br>
MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),<br>
draft-nordmark-intarea-ippl for split subnets, and<br>
draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet models.=
 And<br>
then you can say that all those components can be plugged in the OMNI route=
r,<br>
and you can discuss which MANET and which MIP you want, including using OMN=
I=E2=80=99s<br>
built in mobility.<br>
<br>
Note that my objections are not against the OMNI design, it might be the<br=
>
perfect thing and I am already aware of use cases that could be served by a=
<br>
P2MP interface like OMNI in conjunction with RFC8505 on the P2P subinterfac=
es<br>
(recycling the high level design we=E2=80=99ve been shipping for IPv4 / fra=
me relay for<br>
the last 30 years). My objection is of the way the draft uses [OMNI] as the=
<br>
magic wand that solves all the problems when what you really do is throw th=
em<br>
over the fence. I=E2=80=99d rather you focus on problems and use cases, for=
 which<br>
there=E2=80=99s excellent text, and indicate what needs to be done without =
making<br>
assumption on how the needful things will be solved.<br>
<br>
In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to spl=
it, keep all<br>
that=E2=80=99s use case and problem description and ship it, remove referen=
ces to<br>
protocols envisioned in the solution, and start the work on architecture of=
 the<br>
solution and the protocol applicability statements separately. An alternate=
<br>
would be to centralize the discussion on protocols to annex, and explain th=
at<br>
protocol A or B could be envisioned in solution space because to over this =
gap<br>
or implement that function.<br>
<br>
In any fashion, the current text is not ready for publication as applicabil=
ity<br>
statement, architecture and or/solution, so the related work should be remo=
ved<br>
from the main text. But I find it mostly ready for use case and problem<br>
statement, more below.<br>
<br>
Review:<br>
<br>
Abstract<br>
<br>
=C2=A0 =C2=A0This document discusses the problem statement and use cases of=
<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for Intelligent Transportation=
<br>
=C2=A0 =C2=A0Systems (ITS).<br>
<br>
&gt;&gt;&gt; The document goes beyond that; there was actually a thread at =
6MAN where<br>
Bob Hinden said =E2=80=9C This document says it is a problem statement, but=
 then<br>
becomes a solution document.=C2=A0 =C2=A0Might be better to cut it down to =
only the<br>
problem statement part. =E2=80=9C &gt;&gt;&gt; Would you consider doing thi=
s? If not, why? Note:<br>
you may want to respond on 6MAN as well. &gt;&gt;&gt; &gt;&gt;&gt;I would h=
ave thought that the<br>
traditional steps of problem statement and applicability statement of exist=
ing<br>
work could be expected from IPWAVE too. &gt;&gt;&gt; Please clarify the ste=
ps that you<br>
intend to follow next with this work.<br>
<br>
&lt;snip&gt;<br>
<br>
1.=C2=A0 Introduction<br>
<br>
&gt;&gt;&gt; Very readable and informative section, many thanks!<br>
<br>
=C2=A0 =C2=A0Along with these WAVE standards and C-V2X standards, regardles=
s of a<br>
=C2=A0 =C2=A0wireless access technology under the IP stack of a vehicle, ve=
hicular<br>
=C2=A0 =C2=A0networks can operate IP mobility with IPv6 [RFC8200] and Mobil=
e IPv6<br>
=C2=A0 =C2=A0protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (P=
MIPv6)<br>
=C2=A0 =C2=A0[RFC5213], Distributed Mobility Management (DMM) [RFC7333], Lo=
cator/<br>
=C2=A0 =C2=A0ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Ext=
ended<br>
=C2=A0 =C2=A0Route Optimization (AERO) [RFC6706BIS]).<br>
<br>
&gt;&gt;&gt; NEMO (RFC 3963) is not cited. Any reason why the vehicle would=
 not<br>
transport a network?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0This document describes use cases and a problem statement abou=
t<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for ITS, which is named IPv6 W=
ireless<br>
=C2=A0 =C2=A0Access in Vehicular Environments (IPWAVE).=C2=A0 First, it int=
roduces the<br>
=C2=A0 =C2=A0use cases for using V2V, V2I, and V2X networking in ITS.=C2=A0=
 Next, for<br>
=C2=A0 =C2=A0IPv6-based vehicular networks, it makes a gap analysis of curr=
ent<br>
=C2=A0 =C2=A0IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Manage=
ment,<br>
=C2=A0 =C2=A0and Security &amp; Privacy), and then enumerates requirements =
for the<br>
=C2=A0 =C2=A0extensions of those IPv6 protocols, which are tailored to IPv6=
-based<br>
=C2=A0 =C2=A0vehicular networking.=C2=A0 Thus, this document is intended to=
 motivate<br>
=C2=A0 =C2=A0development of key protocols for IPWAVE.<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
2.=C2=A0 Terminology<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0o=C2=A0 IP-OBU: &quot;Internet Protocol On-Board Unit&quot;: A=
n IP-OBU denotes a<br>
=C2=A0 =C2=A0 =C2=A0 computer situated in a vehicle (e.g., car, bicycle, au=
tobike,<br>
=C2=A0 =C2=A0 =C2=A0 motor cycle, and a similar one) and a device (e.g., sm=
artphone and<br>
=C2=A0 =C2=A0 =C2=A0 IoT device).=C2=A0 It has at least one IP interface th=
at runs in IEEE<br>
=C2=A0 =C2=A0 =C2=A0 802.11-OCB and has an &quot;OBU&quot; transceiver.=C2=
=A0 Also, it may have an IP<br>
=C2=A0 =C2=A0 =C2=A0 interface that runs in Cellular V2X (C-V2X) [TS-23.285=
-3GPP]<br>
=C2=A0 =C2=A0 =C2=A0 [TR-22.886-3GPP][TS-23.287-3GPP].=C2=A0 See the defini=
tion of the term<br>
=C2=A0 =C2=A0 =C2=A0 &quot;OBU&quot; in [RFC8691].<br>
<br>
&gt;&gt;&gt; Can that be a router connecting multiple computers?<br>
<br>
&lt;snip&gt;<br>
<br>
3.=C2=A0 Use Cases<br>
<br>
&gt;&gt;&gt; This is another great read and an enlightening section. Maybe =
mention in<br>
the abstract that the doc also covers use cases?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Although a Layer-2 solution can provide a support for multihop=
<br>
=C2=A0 =C2=A0communications in vehicular networks, the scalability issue re=
lated<br>
=C2=A0 =C2=A0to multihop forwarding still remains when vehicles need to<br>
=C2=A0 =C2=A0disseminate or forward packets toward multihop-away destinatio=
ns.=C2=A0 In<br>
=C2=A0 =C2=A0addition, the IPv6-based approach for V2V as a network layer p=
rotocol<br>
=C2=A0 =C2=A0can accommodate multiple radio technologies as MAC protocols, =
such as<br>
=C2=A0 =C2=A05G V2X and DSRC.=C2=A0 Therefore, the existing IPv6 protocol c=
an be<br>
=C2=A0 =C2=A0augmented through the addition of an Overlay Multilink Network=
 (OMNI)<br>
=C2=A0 =C2=A0Interface [OMNI] and/or protocol changes in order to support b=
oth<br>
=C2=A0 =C2=A0wireless single-hop/multihop V2V communications and multiple r=
adio<br>
=C2=A0 =C2=A0technologies in vehicular networks.=C2=A0 In such a way, vehic=
les can<br>
=C2=A0 =C2=A0communicate with each other by V2V communications to share eit=
her an<br>
=C2=A0 =C2=A0emergency situation or road hazard in a highway having multipl=
e kinds<br>
=C2=A0 =C2=A0of radio technologies, such as 5G V2X and DSRC.<br>
<br>
&gt;&gt;&gt; This text appears in the middle of high level use case, with a=
 crude list<br>
of protocols; this is not a place for it<br>
<br>
&gt;&gt;&gt; On a 6MAN Thread, Brian Carpenter said that the above:<br>
=E2=80=9C<br>
is of concern regardless of the mention of OMNI. Does it mean &quot;can be&=
quot; or<br>
&quot;needs to be&quot;? This paragraph seems like a very short summary of =
a big problem<br>
area. At the end of page 13 there is some related discussion, which mention=
s<br>
RPL as part of the solution (good choice, IMHO) but again seems to depend o=
n<br>
OMNI. I don&#39;t think the fix of simply removing references to OMNI works=
,<br>
because it would leave a gap. In an informational document, that is not a<b=
r>
formal problem but as far as this draft describes architecture, I don&#39;t=
 think<br>
that big a gap is reasonable. &quot;OMNI&quot; is mentioned more than 20 ti=
mes in the<br>
document. There are also several references to AERO, which is strongly<br>
associated with OMNI. =E2=80=9C &gt;&gt;&gt; I agree with Brian. Here the d=
ocument seems to be<br>
mixing solution with problem and putting the cart before the horse. My<br>
recommendation is to stick to what needs to be done that IPv6 does not do y=
et<br>
-the reqs and gaps-; but the doc should not step in the how things will be =
done<br>
unless the group already decided to do it. The logical next steps to a PS a=
re<br>
an applicability statement of existing work, and if the gaps cannot be fill=
ed,<br>
there may be one or more WG chartered to fill those gaps.<br>
<br>
&gt;&gt;&gt; I=E2=80=99d still be happy to see an annex with leads on where=
 the solution might<br>
come from like RFC 8691 does.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2I communications in a highway where RSUs a=
re<br>
=C2=A0 =C2=A0sparsely deployed, so a vehicle can reach the wireless coverag=
e of an<br>
=C2=A0 =C2=A0RSU through the multihop data forwarding of intermediate vehic=
les.<br>
=C2=A0 =C2=A0Thus, IPv6 needs to be extended for multihop V2I communication=
s.<br>
<br>
&gt;&gt;&gt; Note that I have no clue on how well OMNI applies in that spac=
e, maybe it<br>
does very well; but here it comes out of the blue with no justification. If=
 you<br>
mention OMNI you need to detail what it is and which of the V2V=C2=A0 probl=
ems you<br>
expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2X (or V2I2X) communications in an urban ro=
ad<br>
=C2=A0 =C2=A0network where RSUs are deployed at intersections, so a vehicle=
 (or a<br>
=C2=A0 =C2=A0pedestrian&#39;s smartphone) can reach the wireless coverage o=
f an RSU<br>
=C2=A0 =C2=A0through the multihop data forwarding of intermediate vehicles =
(or<br>
=C2=A0 =C2=A0pedestrians&#39; smartphones).=C2=A0 Thus, IPv6 needs to be ex=
tended for<br>
=C2=A0 =C2=A0multihop V2X (or V2I2X) communications.<br>
<br>
&gt;&gt;&gt; Please be more specific on what the missing functions are and =
whether they<br>
are missing from the stack development standpoint or if there=E2=80=99s wor=
k needed<br>
from the IETF. 1)=C2=A0 =C2=A0 =C2=A0 If something is really missing in our=
 specs, the text to<br>
prove from the use case above is missing 2)=C2=A0 =C2=A0 =C2=A0 how OMNI se=
rves the use case<br>
could be elaborated in an applicability statement of OMNI for V2xyz, but it=
 is<br>
a bit blunt to present it as panacea when the problems to be solved are not=
<br>
listed. 3)=C2=A0 =C2=A0 =C2=A0 If you look at it, OMNI seems like a softwar=
e mobile router<br>
within a bump in the stack. Can that become too big?<br>
<br>
&gt;&gt;&gt; my view is that the text above and the similar occasions shoul=
d be replaced<br>
by something like :<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented to provide the fo=
llowing<br>
=C2=A0 =C2=A0functions: 1) =E2=80=A6<br>
<br>
&gt;&gt;&gt; and / or something like:<br>
<br>
=C2=A0 =C2=A0In addition to the IPv6 node requirements [RFC 8504], the IPv6=
 protocol<br>
=C2=A0 =C2=A0stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=
=A6<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To support applications of these V2X use cases, the functions =
of IPv6<br>
=C2=A0 =C2=A0such as VND, VMM, and VSP are prerequisites for IPv6-based pac=
ket<br>
=C2=A0 =C2=A0exchange, transport-layer session continuity, and secure, safe=
<br>
=C2=A0 =C2=A0communication between a vehicle and a pedestrian either direct=
ly or<br>
=C2=A0 =C2=A0indirectly via an IP-RSU.<br>
<br>
&gt;&gt;&gt; =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=
=9D does not parse. There=E2=80=99s<br>
no IPv6 reference that provides those functions. If the intention is to say=
<br>
that there=E2=80=99s stuff to add to IPv6 to support, like, say,=C2=A0 VND,=
 then this<br>
document fails to define how an IPv6 VND should behave, though it=E2=80=99s=
 precisely<br>
what I=E2=80=99d expect from a problem statement.<br>
<br>
&lt;snip&gt;<br>
<br>
4.=C2=A0 Vehicular Networks<br>
<br>
&gt;&gt;&gt; What is the purpose of section 4 as a whole, problem statement=
 or<br>
applicability statement of the listed protocols? In the former case what=E2=
=80=99s the<br>
problem? In the latter case it is incomplete and needs to be exported to an=
<br>
applicability statement doc with all the possible technologies evaluated.<b=
r>
<br>
=C2=A0 =C2=A0This section describes an example vehicular network architectu=
re<br>
=C2=A0 =C2=A0supporting V2V, V2I, and V2X communications in vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt; I read this as presenting a context to explain what the proble=
ms are<br>
instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe usin=
g the term<br>
=E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=99s =
comment.<br>
<br>
&lt;snip&gt;<br>
<br>
4.1.=C2=A0 Vehicular Network Architecture<br>
<br>
=C2=A0 =C2=A0Figure 1 shows an example vehicular network architecture for V=
2I and<br>
=C2=A0 =C2=A0V2V in a road network [OMNI].<br>
<br>
a.=C2=A0 =C2=A0 =C2=A0 Is using OMNI a decision that the WG made for the fu=
ture work ? what<br>
does it do and what does it not do? b.=C2=A0 =C2=A0 =C2=A0 Is there work le=
ft to be done? Who<br>
will do that work? Or is it the expectation that OMNI has it all defined<br=
>
already?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An existing network architecture (e.g., an IP-based aeronautic=
al<br>
=C2=A0 =C2=A0network architecture [OMNI][UAM-ITS], a network architecture o=
f<br>
=C2=A0 =C2=A0PMIPv6 [RFC5213], and a low-power and lossy network architectu=
re<br>
=C2=A0 =C2=A0[RFC6550]) can be extended to a vehicular network architecture=
 for<br>
=C2=A0 =C2=A0multihop V2V, V2I, and V2X, as shown in Figure 1.=C2=A0 In a h=
ighway<br>
=C2=A0 =C2=A0scenario, a vehicle may not access an RSU directly because of =
the<br>
=C2=A0 =C2=A0distance of the DSRC coverage (up to 1 km).=C2=A0 For example,=
 the OMNI<br>
=C2=A0 =C2=A0interface and/or RPL (IPv6 Routing Protocol for Low-Power and =
Lossy<br>
=C2=A0 =C2=A0Networks) [RFC6550] can be extended to support a multihop V2I =
since a<br>
=C2=A0 =C2=A0vehicle can take advantage of other vehicles as relay nodes to=
 reach<br>
=C2=A0 =C2=A0the RSU.=C2=A0 Also, RPL can be extended to support both multi=
hop V2V and<br>
=C2=A0 =C2=A0V2X in the similar way.<br>
<br>
&gt;&gt;&gt; all this could fit well in annex; anyway you need to explain w=
hat you<br>
expect the protocols to do and which extension is needed. In the case of RP=
L at<br>
least you indicate that it would do routing, but not why you cannot use it =
of<br>
the shelf; for OMNI, what you expect is less clear, though there=E2=80=99s =
text<br>
elsewhere about the many radio interfaces that could be used for the purpos=
e,<br>
and the text in the UAM below that is enlightening.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 To support not only the mobil=
ity<br>
=C2=A0 =C2=A0management of the UAM end systems, but also the multihop and<b=
r>
=C2=A0 =C2=A0multilink communications of the UAM interfaces, the UAM end sy=
stems<br>
=C2=A0 =C2=A0can employ an Overlay Multilink Network (OMNI) interface [OMNI=
] as a<br>
=C2=A0 =C2=A0virtual Non-Broadcast Multiple Access (NBMA) connection to a s=
erving<br>
=C2=A0 =C2=A0ground domain infrastructure.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; when connecting to a MANET it needs support for that MANET. The t=
ext<br>
above seems to imply that is solves everything in V2xyz like magic; reminds=
 me<br>
of the IPv6 multicast abstraction that was supposed to solve the broadcast<=
br>
problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 This infrastructure can be configured<br>
=C2=A0 =C2=A0over the underlying data links.=C2=A0 The OMNI interface and i=
ts link<br>
=C2=A0 =C2=A0model provide a means of multilink, multihop and mobility<br>
=C2=A0 =C2=A0coordination to the legacy IPv6 ND messaging [RFC4861] accordi=
ng to<br>
=C2=A0 =C2=A0the NBMA principle.=C2=A0 Thus, the OMNI link model can suppor=
t efficient<br>
=C2=A0 =C2=A0UAM internetworking services without additional mobility messa=
ging,<br>
=C2=A0 =C2=A0and without any modification to the IPv6 ND messaging services=
 or<br>
=C2=A0 =C2=A0link model.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; the text above seems to imply that is solves everything in V2xyz =
like<br>
magic; that would be a stretch, that reminds me of IPv6 multicast that was<=
br>
supposed to solve the broadcast problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Multiple vehicles under the coverage of an RSU share a prefix =
just as<br>
=C2=A0 =C2=A0mobile nodes share a prefix of a Wi-Fi access point in a wirel=
ess<br>
=C2=A0 =C2=A0LAN.=C2=A0 This is a natural characteristic in infrastructure-=
based<br>
=C2=A0 =C2=A0wireless networks.=C2=A0 For example, in Figure 1, two vehicle=
s (i.e.,<br>
=C2=A0 =C2=A0Vehicle2, and Vehicle5) can use Prefix 1 to configure their IP=
v6<br>
=C2=A0 =C2=A0global addresses for V2I communication.=C2=A0 Alternatively, m=
obile nodes<br>
=C2=A0 =C2=A0can employ an OMNI interface and use their own IPv6 Unique Loc=
al<br>
=C2=A0 =C2=A0Addresses (ULAs) [RFC4193] over the wireless network without<b=
r>
=C2=A0 =C2=A0requiring the messaging of IPv6 Stateless Address Autoconfigur=
ation<br>
=C2=A0 (SLAAC) [RFC4862], which uses an on-link prefix provided by the<br>
=C2=A0 =C2=A0(visited) wireless LAN; this technique is known as &quot;Bring=
-Your-Own-<br>
=C2=A0 =C2=A0Addresses&quot;.<br>
<br>
&gt;&gt;&gt;=C2=A0 Is OMNI the only way to &quot;Bring-Your-Own-Addresses=
=E2=80=9D? Else the text could be<br>
more generic, at least use e.g., like the ref to AERO later. &gt;&gt;&gt; W=
hat are the<br>
implications / limitations of doing that =E2=80=93 like they can do line of=
 sight V2V<br>
but not reach the internet, or the need of=C2=A0 a local MANET / RPL that w=
ill<br>
accept to route those addresses, or the security / address ownership valida=
tion<br>
issues ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0A single subnet prefix announced by an RSU can span multiple v=
ehicles<br>
=C2=A0 =C2=A0in VANET.=C2=A0 For example, in Figure 1, for Prefix 1, three =
vehicles<br>
=C2=A0 =C2=A0(i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a conne=
cted<br>
=C2=A0 =C2=A0VANET.=C2=A0 Also, for Prefix 2, two vehicles (i.e., Vehicle3 =
and<br>
=C2=A0 =C2=A0Vehicle6) can construct another connected VANET, and for Prefi=
x 3,<br>
=C2=A0 =C2=A0two vehicles (i.e., Vehicle4 and Vehicle7) can construct anoth=
er<br>
=C2=A0 =C2=A0connected VANET.=C2=A0 Alternatively, each vehicle could emplo=
y an OMNI<br>
=C2=A0 =C2=A0interface with their own ULAs such that no topologically-orien=
ted<br>
=C2=A0 =C2=A0subnet prefixes need be announced by the RSU.<br>
<br>
&gt;&gt;&gt;=C2=A0 same as above. This seems to restate the same thing, der=
ive an address<br>
from a topologically correct prefix or use your own with limitations to be<=
br>
described.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]<b=
r>
=C2=A0 =C2=A0specifies several details, including Maximum Transmission Unit=
 (MTU),<br>
=C2=A0 =C2=A0frame format, link-local address, address mapping for unicast =
and<br>
=C2=A0 =C2=A0multicast, stateless autoconfiguration, and subnet structure.=
=C2=A0 An<br>
=C2=A0 =C2=A0Ethernet Adaptation (EA) layer is in charge of transforming so=
me<br>
=C2=A0 =C2=A0parameters between the IEEE 802.11 MAC layer and the IPv6 netw=
ork<br>
=C2=A0 =C2=A0layer, which is located between the IEEE 802.11-OCB&#39;s logi=
cal link<br>
=C2=A0 =C2=A0control layer and the IPv6 network layer.=C2=A0 This IPv6 over=
 802.11-OCB<br>
=C2=A0 =C2=A0can be used for both V2V and V2I in IPv6-based vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt;=C2=A0 solution space.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An IPv6 mobility solution is needed for the guarantee of<br>
=C2=A0 =C2=A0communication continuity in vehicular networks so that a vehic=
le&#39;s<br>
=C2=A0 =C2=A0TCP session can be continued, or UDP packets can be delivered =
to a<br>
=C2=A0 =C2=A0vehicle as a destination without loss while it moves from an I=
P-RSU&#39;s<br>
=C2=A0 =C2=A0wireless coverage to another IP-RSU&#39;s wireless coverage.=
=C2=A0 In<br>
=C2=A0 =C2=A0Figure 1, assuming that Vehicle2 has a TCP session (or a UDP s=
ession)<br>
=C2=A0 =C2=A0with a corresponding node in the vehicular cloud, Vehicle2 can=
 move<br>
=C2=A0 =C2=A0from IP-RSU1&#39;s wireless coverage to IP-RSU2&#39;s wireless=
 coverage.=C2=A0 In<br>
=C2=A0 =C2=A0this case, a handover for Vehicle2 needs to be performed by ei=
ther a<br>
=C2=A0 =C2=A0host-based mobility management scheme (e.g., MIPv6 [RFC6275]) =
or a<br>
=C2=A0 =C2=A0network-based mobility management scheme (e.g., PMIPv6 [RFC521=
3] and<br>
=C2=A0 =C2=A0AERO [RFC6706BIS]).<br>
<br>
=C2=A0 =C2=A0In the host-based mobility scheme (e.g., MIPv6), an IP-RSU pla=
ys a<br>
=C2=A0 =C2=A0role of a home agent.=C2=A0 On the other hand, in the network-=
based<br>
=C2=A0 =C2=A0mobility scheme (e.g., PMIPv6, an MA plays a role of a mobilit=
y<br>
=C2=A0 =C2=A0management controller such as a Local Mobility Anchor (LMA) in=
<br>
=C2=A0 =C2=A0PMIPv6, which also serves vehicles as a home agent, and an IP-=
RSU<br>
=C2=A0 =C2=A0plays a role of an access router such as a Mobile Access Gatew=
ay<br>
=C2=A0 =C2=A0(MAG) in PMIPv6 [RFC5213].=C2=A0 The host-based mobility schem=
e needs<br>
=C2=A0 =C2=A0client functionality in IPv6 stack of a vehicle as a mobile no=
de for<br>
=C2=A0 =C2=A0mobility signaling message exchange between the vehicle and ho=
me<br>
=C2=A0 =C2=A0agent.=C2=A0 On the other hand, the network-based mobility sch=
eme does not<br>
=C2=A0 =C2=A0need such a client functionality for a vehicle because the net=
work<br>
=C2=A0 =C2=A0infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility =
agent<br>
=C2=A0 =C2=A0handles the mobility signaling message exchange with the home =
agent<br>
=C2=A0 =C2=A0(e.g., LMA in PMIPv6) for the sake of the vehicle.<br>
<br>
=C2=A0 =C2=A0There are a scalability issue and a route optimization issue i=
n the<br>
=C2=A0 =C2=A0network-based mobility scheme (e.g., PMIPv6) when an MA covers=
 a<br>
=C2=A0 =C2=A0large vehicular network governing many IP-RSUs.=C2=A0 In this =
case, a<br>
=C2=A0 =C2=A0distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate=
 the<br>
=C2=A0 =C2=A0scalability issue by distributing multiple MAs in the vehicula=
r<br>
=C2=A0 =C2=A0network such that they are positioned closer to vehicles for r=
oute<br>
=C2=A0 =C2=A0optimization and bottleneck mitigation in a central MA in the<=
br>
=C2=A0 =C2=A0network-based mobility scheme.=C2=A0 All these mobility approa=
ches (i.e.,<br>
=C2=A0 =C2=A0a host-based mobility scheme, network-based mobility scheme, a=
nd<br>
=C2=A0 =C2=A0distributed mobility scheme) and a hybrid approach of a combin=
ation<br>
=C2=A0 =C2=A0of them need to provide an efficient mobility service to vehic=
les<br>
=C2=A0 =C2=A0moving fast and moving along with the relatively predictable<b=
r>
=C2=A0 =C2=A0trajectories along the roadways.<br>
<br>
=C2=A0 =C2=A0In vehicular networks, the control plane can be separated from=
 the<br>
=C2=A0 =C2=A0data plane for efficient mobility management and data forwardi=
ng by<br>
=C2=A0 =C2=A0using the concept of Software-Defined Networking (SDN)<br>
=C2=A0 =C2=A0[RFC7149][DMM-FPC].=C2=A0 Note that Forwarding Policy Configur=
ation (FPC)<br>
=C2=A0 =C2=A0in [DMM-FPC], which is a flexible mobility management system, =
can<br>
=C2=A0 =C2=A0manage the separation of data-plane and control-plane in DMM.=
=C2=A0 In<br>
=C2=A0 =C2=A0SDN, the control plane and data plane are separated for the ef=
ficient<br>
=C2=A0 =C2=A0management of forwarding elements (e.g., switches and routers)=
 where<br>
=C2=A0 =C2=A0an SDN controller configures the forwarding elements in a cent=
ralized<br>
=C2=A0 =C2=A0way and they perform packet forwarding according to their forw=
arding<br>
=C2=A0 =C2=A0tables that are configured by the SDN controller.=C2=A0 An MA =
as an SDN<br>
=C2=A0 =C2=A0controller needs to efficiently configure and monitor its IP-R=
SUs and<br>
=C2=A0 =C2=A0vehicles for mobility management, location management, and sec=
urity<br>
=C2=A0 =C2=A0services.<br>
<br>
=C2=A0 =C2=A0The mobility information of a GPS receiver mounted in its vehi=
cle<br>
=C2=A0 =C2=A0(e.g., position, speed, and direction) can be used to accommod=
ate<br>
=C2=A0 =C2=A0mobility-aware proactive handover schemes, which can perform t=
he<br>
=C2=A0 =C2=A0handover of a vehicle according to its mobility and the wirele=
ss<br>
=C2=A0 =C2=A0signal strength of a vehicle and an IP-RSU in a proactive way.=
<br>
<br>
=C2=A0 =C2=A0Vehicles can use the TCC as their Home Network having a home a=
gent<br>
=C2=A0 =C2=A0for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5=
213],<br>
=C2=A0 =C2=A0so the TCC (or an MA inside the TCC) maintains the mobility<br=
>
=C2=A0 =C2=A0information of vehicles for location management.=C2=A0 IP tunn=
eling over<br>
=C2=A0 =C2=A0the wireless link should be avoided for performance efficiency=
.<br>
=C2=A0 =C2=A0Also, in vehicular networks, asymmetric links sometimes exist =
and<br>
=C2=A0 =C2=A0must be considered for wireless communications such as V2V and=
 V2I.<br>
<br>
&gt;&gt;&gt;=C2=A0 This is all very informative text but does not state a p=
roblem. Is there a<br>
problem is left to be solved or are we assessing the applicability of<br>
protocols? Could it for instance, forward point to issues discussed in sect=
ion<br>
5?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, as internal networks, a vehicle&#39;s mo=
ving<br>
=C2=A0 =C2=A0network and an EN&#39;s fixed network are self-contained netwo=
rks having<br>
=C2=A0 =C2=A0multiple subnets and having an edge router (e.g., IP-OBU and I=
P-RSU)<br>
=C2=A0 =C2=A0for the communication with another vehicle or another EN.=C2=
=A0 The<br>
=C2=A0 =C2=A0internetworking between two internal networks via V2I communic=
ation<br>
=C2=A0 =C2=A0requires the exchange of the network parameters and the networ=
k<br>
=C2=A0 =C2=A0prefixes of the internal networks.=C2=A0 For the efficiency, t=
he network<br>
=C2=A0 =C2=A0prefixes of the internal networks (as a moving network) in a v=
ehicle<br>
=C2=A0 =C2=A0need to be delegated and configured automatically.=C2=A0 Note =
that a<br>
=C2=A0 =C2=A0moving network&#39;s network prefix can be called a Mobile Net=
work Prefix<br>
=C2=A0 =C2=A0(MNP) [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. MNP is originally =
defined here<br>
<a href=3D"https://datatracker.ietf.org/doc/html/rfc3963#section-2" rel=3D"=
noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/html/rfc3963=
#section-2</a> and that=E2=80=99s a reference<br>
you can use normatively.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, the addresses used for IPv6 transmission=
s over<br>
=C2=A0 =C2=A0the wireless link interfaces for IP-OBU and IP-RSU can be eith=
er<br>
=C2=A0 =C2=A0global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets ca=
n be<br>
=C2=A0 =C2=A0routed within vehicular networks [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. There needs to=C2=
=A0 be a routing protocol<br>
like a MANET that will accept to carry the<br>
=C2=A0MNPs, and that must be implemented by the infra and both cars. The OM=
NI spec<br>
=C2=A0is clear on that. This is why at first glance I see OMNI as a full mo=
bile<br>
=C2=A0router in a bump in the stack. Now what is the problem behind this? N=
o such<br>
=C2=A0protocol at IETF? Too many to choose from? No deployment?<br>
&lt;snip&gt;<br>
<br>
When global IPv6 addresses<br>
=C2=A0 =C2=A0are used, wireless interface configuration and control overhea=
d for<br>
=C2=A0 =C2=A0Duplicate Address Detection (DAD) [RFC4862] and Multicast List=
ener<br>
=C2=A0 =C2=A0Discovery (MLD) [RFC2710][RFC3810] should be minimized to supp=
ort V2I<br>
=C2=A0 =C2=A0and V2X communications for vehicles moving fast along roadways=
; when<br>
=C2=A0 =C2=A0ULAs and the OMNI interface are used, no DAD nor MLD messaging=
 is<br>
=C2=A0 =C2=A0needed.<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it t=
he no dad needed a property<br>
of injecting a BYOA in the fabric for an GUA MIP Home Address which is know=
n to<br>
be unique at home? &gt;&gt;&gt; OTOH, autoconf=E2=80=99ing a random ULA =E2=
=80=9CFD=E2=80=A6=E2=80=9Dprefix has lesser<br>
DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classical =
subnet. So<br>
who says DAD isn=E2=80=99t required for OMNI ULA? &gt;&gt;&gt; note that IM=
HO DAD on wireless is<br>
a lot more harm than good, and I agree that with a good pseudo random gener=
ator<br>
the ULA has no chance to collision in the real world, as OMNI claims. It=E2=
=80=99s just<br>
that your argument here plays the other way, because there are less random =
bits<br>
(56)=C2=A0 in the ULA prefix than in the IID (62), and if one starts using =
more<br>
prefix bits to be non-random, there will be a time when DAD on prefix is ne=
eded.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Let us consider the upload/download time of a vehicle when it =
passes<br>
=C2=A0 =C2=A0through the wireless communication coverage of an IP-RSU.=C2=
=A0 For a<br>
=C2=A0 =C2=A0given typical setting where 1km is the maximum DSRC communicat=
ion<br>
=C2=A0 =C2=A0range [DSRC] and 100km/h is the speed limit in highway, the dw=
elling<br>
=C2=A0 =C2=A0time can be calculated to be 72 seconds by dividing the diamet=
er of<br>
=C2=A0 =C2=A0the 2km (i.e., two times of DSRC communication range where an =
IP-RSU<br>
=C2=A0 =C2=A0is located in the center of the circle of wireless communicati=
on) by<br>
=C2=A0 =C2=A0the speed limit of 100km/h (i.e., about 28m/s).=C2=A0 For the =
72 seconds,<br>
=C2=A0 =C2=A0a vehicle passing through the coverage of an IP-RSU can upload=
 and<br>
=C2=A0 =C2=A0download data packets to/from the IP-RSU.<br>
<br>
&lt;snip&gt;<br>
<br>
4.3.=C2=A0 V2V-based Internetworking<br>
<br>
&gt;&gt;&gt; In this section it looks like the cars are in a stable line of=
 sight<br>
relationship. Which is probably fine for a platoon, but when you drive alon=
g<br>
with friends in different cars, you realize that the line of sight assumpti=
on<br>
does not stand over time. Soon enough, other cars meddle in, and possibly o=
ne<br>
of the cars drives faster and too far ahead so you need the infra to relay,=
<br>
possibly over multiple infra hops.<br>
<br>
&gt;&gt;&gt; so in this section, I=E2=80=99d expect to see a Vehicle commun=
icating with another<br>
one and using either line of sight or V2V relaying but also using relay via=
 V2I<br>
(multihop I2I not just hub and spoke V2I2V ), alternatively to together for=
<br>
redundancy. Is that part of the problem?<br>
<br>
&gt;&gt;&gt; reading deeper section 5 I found excellent text on routing via=
 V and via I.<br>
This tells that section 4 does not play a good role at justifying section 5=
.<br>
Maybe keep section 4 for another doc?<br>
<br>
&gt;&gt;&gt; What kind or reliability is required in a V2V use case? Do you=
 think ND can<br>
handle it? Or MANET? What would be the assumption on L2 (roaming time, unic=
ast<br>
vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3 <br=
>
redundancy?<br>
<br>
&lt;snip&gt;<br>
<br>
5.=C2=A0 Problem Statement<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0In order to specify protocols using the architecture mentioned=
 in<br>
=C2=A0 =C2=A0Section 4.1, IPv6 core protocols have to be adapted to overcom=
e<br>
=C2=A0 =C2=A0certain challenging aspects of vehicular networking.=C2=A0 Sin=
ce the<br>
=C2=A0 =C2=A0vehicles are likely to be moving at great speed, protocol exch=
anges<br>
=C2=A0 =C2=A0need to be completed in a time relatively short compared to th=
e<br>
=C2=A0 =C2=A0lifetime of a link between a vehicle and an IP-RSU, or between=
 two<br>
=C2=A0 =C2=A0vehicles.<br>
<br>
&gt;&gt;&gt; Any order of magnitude?<br>
&gt;&gt;&gt; Can you indicate whether this already rules out certain proced=
ures, e.g.<br>
DAD ?<br>
<br>
=C2=A0 =C2=A0The lifetime of a session varies depending on the session&#39;=
s type such<br>
=C2=A0 =C2=A0as a web surfing, voice call over IP, and DNS query.=C2=A0 Reg=
ardless of a<br>
=C2=A0 =C2=A0session&#39;s type, to guide all the IPv6 packets to their des=
tination<br>
=C2=A0 =C2=A0host, IP mobility should be supported for the session.<br>
<br>
&gt;&gt;&gt; this seems to be for unicast when you know who to talk to. Is =
there a need<br>
some multicast groups like anybody around interested in topic blah like I c=
ould<br>
be multicasting the speed of vehicles coming the other way that I crossed<b=
r>
recently, for use of vehicles that I=E2=80=99m crossing now, so they can se=
e a slowdown<br>
on advance<br>
<br>
=C2=A0 =C2=A0Thus, the time constraint of a wireless link has a major impac=
t on<br>
=C2=A0 =C2=A0IPv6 Neighbor Discovery (ND).=C2=A0 Mobility Management (MM) i=
s also<br>
=C2=A0 =C2=A0vulnerable to disconnections that occur before the completion =
of<br>
=C2=A0 =C2=A0identity verification and tunnel management.=C2=A0 This is esp=
ecially true<br>
=C2=A0 =C2=A0given the unreliable nature of wireless communication.=C2=A0 T=
his section<br>
=C2=A0 =C2=A0presents key topics such as neighbor discovery and mobility<br=
>
=C2=A0 =C2=A0management.<br>
<br>
&gt;&gt;&gt; Only ND? What about the MANET?<br>
&gt;&gt;&gt; how fast should ND be to be suitable?<br>
&gt;&gt;&gt; is there also a bandwidth check? You can make things much fast=
er if you<br>
dedicate a lot of spectrum to it. But that can also be a waste.<br>
<br>
5.1.=C2=A0 Neighbor Discovery<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The requirements for IPv6 ND for vehicular networks are effici=
ent DAD<br>
=C2=A0 =C2=A0and NUD operations.<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 This merging and partitioning should be considered for=
 the<br>
=C2=A0 =C2=A0IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAA=
C)<br>
=C2=A0 =C2=A0[RFC4862].<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Also, the partitioning of a VANET may make vehicles with the s=
ame<br>
=C2=A0 =C2=A0prefix be physically unreachable.=C2=A0 Also, SLAAC needs to p=
revent IPv6<br>
=C2=A0 =C2=A0address duplication due to the merging of VANETs.=C2=A0 Accord=
ing to the<br>
=C2=A0 =C2=A0merging and partitioning, a destination vehicle (as an IPv6 ho=
st)<br>
=C2=A0 =C2=A0needs to be distinguished as either an on-link host or an off-=
link<br>
=C2=A0 =C2=A0host even though the source vehicle uses the same prefix as th=
e<br>
=C2=A0 =C2=A0destination vehicle.<br>
<br>
&gt;&gt;&gt; should reference to draft-nordmark-intarea-ippl<br>
<br>
=C2=A0 =C2=A0To efficiently prevent IPv6 address duplication due to the VAN=
ET<br>
=C2=A0 =C2=A0partitioning and merging from happening in vehicular networks,=
 the<br>
=C2=A0 =C2=A0vehicular networks need to support a vehicular-network-wide DA=
D by<br>
=C2=A0 =C2=A0defining a scope that is compatible with the legacy DAD.=C2=A0=
 In this<br>
=C2=A0 =C2=A0case, two vehicles can communicate with each other when there =
exists<br>
=C2=A0 =C2=A0a communication path over VANET or a combination of VANETs and=
 IP-<br>
=C2=A0 =C2=A0RSUs, as shown in Figure 1.=C2=A0 By using the vehicular-netwo=
rk-wide DAD,<br>
=C2=A0 =C2=A0vehicles can assure that their IPv6 addresses are unique in th=
e<br>
=C2=A0 =C2=A0vehicular network whenever they are connected to the vehicular=
<br>
=C2=A0 =C2=A0infrastructure or become disconnected from it in the form of V=
ANET.<br>
<br>
&gt;&gt;&gt; Excellent<br>
<br>
=C2=A0 =C2=A0ND time-related parameters such as router lifetime and Neighbo=
r<br>
=C2=A0 =C2=A0Advertisement (NA) interval need to be adjusted for vehicle sp=
eed and<br>
=C2=A0 =C2=A0vehicle density.=C2=A0 For example, the NA interval needs to b=
e<br>
=C2=A0 =C2=A0dynamically adjusted according to a vehicle&#39;s speed so tha=
t the<br>
=C2=A0 =C2=A0vehicle can maintain its neighboring vehicles in a stable way,=
<br>
=C2=A0 =C2=A0considering the collision probability with the NA messages sen=
t by<br>
=C2=A0 =C2=A0other vehicles.<br>
<br>
&gt;&gt;&gt; Is that a problem or just an operational setting that needs to=
 be found?<br>
&gt;&gt;&gt; Do we need to reconsider the concepts of those timers?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, IPv6 ND should have =
minimum<br>
=C2=A0 =C2=A0changes for the interoperability with the legacy IPv6 ND used =
in the<br>
=C2=A0 =C2=A0Internet, including the DAD and NUD operations.<br>
<br>
&gt;&gt;&gt; I do not find the logical link with the text before, why is th=
is a =E2=80=9Cthus=E2=80=9D?<br>
&gt;&gt;&gt; why should the ND inside the VANET be constrained to be intero=
perable? This<br>
may place constraints on the solution.<br>
<br>
5.1.1.=C2=A0 Link Model<br>
<br>
=C2=A0 =C2=A0A prefix model for a vehicular network needs to facilitate the=
<br>
<br>
&gt;&gt;&gt; Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=
=80=9Cprefix model=E2=80=9D.<br>
&gt;&gt;&gt; it would make this piece and the next should refer to<br>
draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both li=
nk<br>
and subnet issues. The general ideas are the same, but the gory details her=
e<br>
are slightly incorrect, like this notion of prefix model than comes out of =
the<br>
blue. The model is really the subnet model for the subnet associated to P2M=
P.<br>
<br>
=C2=A0 =C2=A0communication between two vehicles with the same prefix regard=
less of<br>
=C2=A0 =C2=A0the vehicular network topology as long as there exist bidirect=
ional<br>
=C2=A0 =C2=A0E2E paths between them in the vehicular network including VANE=
Ts and<br>
=C2=A0 =C2=A0IP-RSUs.=C2=A0 This prefix model allows vehicles with the same=
 prefix to<br>
=C2=A0 =C2=A0communicate with each other via a combination of multihop V2V =
and<br>
=C2=A0 =C2=A0multihop V2I with VANETs and IP-RSUs.=C2=A0 Note that the OMNI=
 interface<br>
=C2=A0 =C2=A0supports an NBMA link model where multihop V2V and V2I communi=
cations<br>
=C2=A0 =C2=A0use each mobile node&#39;s ULAs without need for any DAD or ML=
D<br>
=C2=A0 =C2=A0messaging.<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; I kinda agree about the OMNI interface model, nothing against =
that. But you<br>
must see that there needs a lot more than what the OMNI interface to get<br=
>
packets across V and I hops to the destination. Like routing ala MANET,<br>
redundancy handling ala DetNet because it will be very lossy, path manageme=
nt<br>
ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND so i=
t does not<br>
solve the ND problems above.<br>
<br>
=C2=A0 =C2=A0IPv6 protocols work under certain assumptions that do not nece=
ssarily<br>
=C2=A0 =C2=A0hold for vehicular wireless access link types other than OMNI/=
NBMA<br>
=C2=A0 =C2=A0[VIP-WAVE][RFC5889]; the rest of this section discusses implic=
ations<br>
=C2=A0 =C2=A0for those link types that do not apply when the OMNI/NBMA link=
 model<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; The keyword here is P2MP / NBMA, and OMNI is one interface tha=
t accepts<br>
that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already P2M=
P / NBMA,<br>
using routing to complete the partial mesh in P2MP. The text seems to imply=
<br>
that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI is=
 loaded with<br>
other stuff than a plain P2MP capable interface. And ND over P2MP is not do=
ne<br>
by OMNI, OMNI only makes classical ND worse and only works in a full mesh. =
OTOH<br>
RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work very =
well<br>
within an OMNI interface and solve those problems. &gt;&gt;&gt; My point is=
 that you<br>
need to tell the full story or refrain from entering solution space in this=
 doc<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0There is a relationship between a link and a prefix, besides t=
he<br>
=C2=A0 =C2=A0different scopes that are expected from the link-local and glo=
bal<br>
=C2=A0 =C2=A0types of IPv6 addresses.=C2=A0 In an IPv6 link, it is assumed =
that all<br>
=C2=A0 =C2=A0interfaces which are configured with the same subnet prefix an=
d with<br>
=C2=A0 =C2=A0on-link bit set can communicate with each other on an IPv6 lin=
k.<br>
<br>
&gt;&gt;&gt; not assumed; that=E2=80=99s what the onlink but set tells. The=
 conclusion should be<br>
that the VANET cannot set the O bit.<br>
<br>
=C2=A0 =C2=A0However, the vehicular link model needs to define the relation=
ship<br>
=C2=A0 =C2=A0between a link and a prefix, considering the dynamics of wirel=
ess<br>
=C2=A0 =C2=A0links and the characteristics of VANET.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0From the previous observation, a vehicular link model should c=
onsider<br>
=C2=A0 =C2=A0the frequent partitioning and merging of VANETs due to vehicle=
<br>
=C2=A0 =C2=A0mobility.=C2=A0 Therefore, the vehicular link model needs to u=
se an on-<br>
=C2=A0 =C2=A0link prefix and off-link prefix according to the network topol=
ogy of<br>
=C2=A0 =C2=A0vehicles such as a one-hop reachable network and a multihop re=
achable<br>
<br>
&gt;&gt;&gt; No, the once a node saw a O bit set that sticks even if it see=
s other<br>
advertisements of the PIO with the O bit not set. &gt;&gt;&gt; This is a gl=
obal and<br>
intrinsic property of the prefix (and an attack vector that could be mentio=
ned<br>
in the sec section). &gt;&gt;&gt; the VANET prefix must never come with the=
 O bit set.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0network (or partitioned networks).=C2=A0 If the vehicles with =
the same<br>
=C2=A0 =C2=A0prefix are reachable from each other in one hop, the prefix sh=
ould be<br>
=C2=A0 =C2=A0on-link.<br>
<br>
&gt;&gt;&gt;&gt; No, see above; but the router may redirect though it is re=
ally risky<br>
unless this is a stable situation like a parking place.<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, the vehicular link m=
odel<br>
=C2=A0 =C2=A0should have minimum changes for interoperability with standard=
 IPv6<br>
=C2=A0 =C2=A0links in an efficient fashion to support IPv6 DAD, MLD and NUD=
<br>
=C2=A0 =C2=A0operations.=C2=A0 When the OMNI NBMA link model is used, there=
 are no link<br>
=C2=A0 =C2=A0model changes nor DAD/MLD messaging required.<br>
<br>
&gt;&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt;&gt; You need a good P2MP subnet model with routing support whe=
n the mesh is<br>
partial. My company alone has been shipping million of nodes that build sub=
nets<br>
of thousands, and that was done using IETF standards.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For vehicular networks with high mobility and density, the DAD=
 needs<br>
=C2=A0 =C2=A0to be performed efficiently with minimum overhead so that the<=
br>
=C2=A0 =C2=A0vehicles can exchange a driving safety message (e.g., collisio=
n<br>
=C2=A0 =C2=A0avoidance and accident notification) with each other with a sh=
ort<br>
=C2=A0 =C2=A0interval (e.g., 0.5 second) by a technical report from NHTSA<b=
r>
=C2=A0 =C2=A0(National Highway Traffic Safety Administration) [NHTSA-ACAS-R=
eport].<br>
=C2=A0 =C2=A0Such a driving safety message may include a vehicle&#39;s mobi=
lity<br>
=C2=A0 =C2=A0information (i.e., position, speed, direction, and acceleratio=
n/<br>
=C2=A0 =C2=A0deceleration).=C2=A0 The exchange interval of this message is =
0.5 second,<br>
=C2=A0 =C2=A0which is required to allow a driver to avoid a rear-end crash =
from<br>
=C2=A0 =C2=A0another vehicle.<br>
<br>
&gt;&gt;&gt; IPv6 over broadcast MAC (used to be called internet 0, 10+ yea=
rs ago)<br>
solves that MAC issue since there is no MAC.<br>
<br>
5.1.3.=C2=A0 Routing<br>
<br>
=C2=A0 =C2=A0For multihop V2V communications in either a VANET or VANETs vi=
a IP-<br>
=C2=A0 =C2=A0RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing proto=
col may<br>
=C2=A0 =C2=A0be required to support both unicast and multicast in the links=
 of the<br>
=C2=A0 =C2=A0subnet with the same IPv6 prefix.=C2=A0 However, it will be co=
stly to run<br>
=C2=A0 =C2=A0both vehicular ND and a vehicular ad hoc routing protocol in t=
erms of<br>
=C2=A0 =C2=A0control traffic overhead [ID-Multicast-Problems].<br>
<br>
&gt;&gt;&gt; we do that with IETF standards on battery operated devices alr=
eady. Using<br>
RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve see=
n 30 hops in<br>
meshes of thousands in the real world though it=E2=80=99s not the normal op=
erational<br>
model, but can happen to maintain connectivity during the reboot of a root)=
 and<br>
does not use broadcast. RPL was initially designed as a V2V2V protocol but<=
br>
found its market on the IoT. I=E2=80=99m sure the protocol would gladly com=
e back to<br>
its roots.<br>
<br>
=C2=A0 =C2=A0A routing protocol for a VANET may cause redundant wireless fr=
ames in<br>
=C2=A0 =C2=A0the air to check the neighborhood of each vehicle and compute =
the<br>
=C2=A0 =C2=A0routing information in a VANET with a dynamic network topology=
<br>
=C2=A0 =C2=A0because the IPv6 ND is used to check the neighborhood of each<=
br>
=C2=A0 =C2=A0vehicle.=C2=A0 Thus, the vehicular routing needs to take advan=
tage of the<br>
=C2=A0 =C2=A0IPv6 ND to minimize its control overhead.<br>
<br>
&gt;&gt;&gt; A clean description of the interaction of RPL and RFC 8505 in =
our IoT<br>
networks. Note that the speed of the PHY in VANET balanced the instability =
of<br>
the topology, and RPL still applies. Note also that RPL uses DV with a rout=
ing<br>
stretch in order to minimize the topology awareness that=E2=80=99s needed i=
n each node,<br>
which results in minimal signaling.<br>
<br>
5.2.=C2=A0 Mobility Management<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For a mobility management scheme in a shared link, where the w=
ireless<br>
=C2=A0 =C2=A0subnets of multiple IP-RSUs share the same prefix, an efficien=
t<br>
=C2=A0 =C2=A0vehicular-network-wide DAD is required.=C2=A0 If DHCPv6 is use=
d to assign<br>
=C2=A0 =C2=A0a unique IPv6 address to each vehicle in this shared link,<br>
<br>
&gt;&gt;&gt; I would not use the term link, or shared. Maybe shared link -&=
gt; domain?<br>
&lt;snip&gt;<br>
<br>
the DAD is<br>
=C2=A0 =C2=A0not required.=C2=A0 On the other hand, for a mobility manageme=
nt scheme<br>
=C2=A0 =C2=A0with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] a=
nd OMNI<br>
=C2=A0 =C2=A0[OMNI]), DAD is not required because the IPv6 address of a veh=
icle&#39;s<br>
=C2=A0 =C2=A0external wireless interface is guaranteed to be unique.<br>
<br>
&gt;&gt;&gt; again overselling OMNI<br>
&gt;&gt;&gt; As I said earlier, this is wring there are (64*) more chances =
of a<br>
collision in OMNI prefixes than in IPv6 IIDs. &gt;&gt;&gt; OMNI prefixes ca=
n collision,<br>
home addresses that are unique on a home network cannot. &gt;&gt;&gt; Now i=
f both the<br>
OMNI prefix and the IID are good randoms, then obviously, the chances of<br=
>
collisions round up to 0. &gt;&gt;&gt; Collision is certainly not my worst =
fear.<br>
<br>
=C2=A0 There is a<br>
=C2=A0 =C2=A0tradeoff between the prefix usage efficiency and DAD overhead.=
=C2=A0 Thus,<br>
=C2=A0 =C2=A0the IPv6 address autoconfiguration for vehicular networks need=
s to<br>
=C2=A0 =C2=A0consider this tradeoff to support efficient mobility managemen=
t.<br>
<br>
&gt;&gt;&gt; This is way too superficial and hides the reality of things.<b=
r>
- Using a VANET Infra prefix allows direct routability to the internet whic=
h<br>
BYOA does not since the BYOA is not topologically correct. Yes, it costs a =
DAD<br>
with classic ND, but it does not with RCF8505 and the draft fails to mentio=
n<br>
that. - A BYOA needs a tunnel home, and the node needs to know who is reach=
able<br>
inside the VANET and what is not to decide to tunnel or not; this is a<br>
difficult problem (vs. control place overhead) that is not discussed here.<=
br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the case of a multihomed network, a vehicle can follow the=
 first-<br>
=C2=A0 =C2=A0hop router selection rule described in [RFC8028].=C2=A0 That i=
s, the<br>
=C2=A0 =C2=A0vehicle should select its default router for each prefix by<br=
>
=C2=A0 =C2=A0preferring the router that advertised the prefix.<br>
<br>
&gt;&gt;&gt; Still router discovery (in and out) must be very fast. Thing o=
f the RA<br>
intervale in MIPv6. Is that sufficient? Too expensive?<br>
<br>
&lt;snip&gt;<br>
<br>
6.=C2=A0 Security Considerations<br>
&gt;&gt;&gt; Any discussion on the security of classical ND and other opera=
tional issues<br>
(rfc6583) ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Security and privacy are paramount in V2I, V2V, and V2X networ=
king.<br>
=C2=A0 =C2=A0Vehicles and infrastructure must be authenticated in order to<=
br>
=C2=A0 =C2=A0participate in vehicular networking.=C2=A0 Also, in-vehicle de=
vices (e.g.,<br>
=C2=A0 =C2=A0ECU) and a driver/passenger&#39;s mobile devices (e.g., smartp=
hone and<br>
=C2=A0 =C2=A0tablet PC) in a vehicle need to communicate with other in-vehi=
cle<br>
=C2=A0 =C2=A0devices and another driver/passenger&#39;s mobile devices in a=
nother<br>
=C2=A0 =C2=A0vehicle, or other servers behind an IP-RSU in a secure way.=C2=
=A0 Even<br>
=C2=A0 =C2=A0though a vehicle is perfectly authenticated and legitimate, it=
 may be<br>
=C2=A0 =C2=A0hacked for running malicious applications to track and collect=
 its<br>
=C2=A0 =C2=A0and other vehicles&#39; information.=C2=A0 In this case, an at=
tack mitigation<br>
=C2=A0 =C2=A0process may be required to reduce the aftermath of malicious<b=
r>
=C2=A0 =C2=A0behaviors.<br>
<br>
&gt;&gt;&gt; The section should mention that both with classical ND and BYO=
A, addresses<br>
can be impersonated, and RFC 8928 protects against that in both cases while=
<br>
maintaining privacy.<br>
<br>
=C2=A0 =C2=A0Even though vehicles can be authenticated with valid certifica=
tes by<br>
=C2=A0 =C2=A0an authentication server in the vehicular cloud, the authentic=
ated<br>
<br>
&gt;&gt;&gt; Is PKI feasible (deploying it in every car?). Is it fast enoug=
h? Is it<br>
really what IPWAVE thinks vehicle should use????? &gt;&gt;&gt; e.g. why wou=
ld one need<br>
to authenticate to a V2I network? &gt;&gt;&gt; from the text earlier in the=
 doc, it<br>
seemed that what you really want is access that is fast to join, capable of=
<br>
offering the reachability you want, anonymous, and innocuous (cars can not =
harm<br>
one another).<br>
<br>
=C2=A0 =C2=A0vehicles may harm other vehicles, so their communication activ=
ities<br>
=C2=A0 =C2=A0need to be logged in either a central way through a logging se=
rver<br>
=C2=A0 =C2=A0(e.g., TCC) in the vehicular cloud or a distributed way (e.g.,=
<br>
=C2=A0 =C2=A0blockchain [Bitcoin]) along with other vehicles or infrastruct=
ure.<br>
=C2=A0 =C2=A0For the non-repudiation of the harmful activities of malicious=
 nodes,<br>
=C2=A0 =C2=A0a blockchain technology can be used [Bitcoin].=C2=A0 Each mess=
age from a<br>
=C2=A0 =C2=A0vehicle can be treated as a transaction and the neighboring ve=
hicles<br>
=C2=A0 =C2=A0can play the role of peers in a consensus method of a blockcha=
in<br>
=C2=A0 =C2=A0[Bitcoin][Vehicular-BlockChain].=C2=A0 For a blockchain&#39;s =
efficient<br>
=C2=A0 =C2=A0consensus in vehicular networks having fast moving vehicles, a=
 new<br>
=C2=A0 =C2=A0consensus algorithm needs to be developed or an existing conse=
nsus<br>
=C2=A0 =C2=A0algorithm needs to be enhanced.<br>
<br>
&gt;&gt;&gt; solution space; better express the=C2=A0 security needs since =
this is a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To identify malicious vehicles among vehicles, an authenticati=
on<br>
=C2=A0 =C2=A0method is required.<br>
<br>
&gt;&gt;&gt; No. As said earlier a vehicle can be infected. You need innocu=
ousness.which<br>
can come from things like isolation, zerotrust, and protocols that are<br>
difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 is<b=
r>
protected by construction, anonymous, and fast.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the setup of a secure channel over IPsec or TLS, the multi=
hop V2I<br>
=C2=A0 =C2=A0communications over DSRC is required in a highway for the<br>
=C2=A0 =C2=A0authentication by involving multiple intermediate vehicles as =
relay<br>
=C2=A0 =C2=A0nodes toward an IP-RSU connected to an authentication server i=
n the<br>
=C2=A0 =C2=A0vehicular cloud.=C2=A0 The V2I communications over 5G V2X (or =
LTE V2X) is<br>
=C2=A0 =C2=A0required to allow a vehicle to communicate directly with a gNo=
deB (or<br>
=C2=A0 =C2=A0eNodeB) connected to an authentication server in the vehicular=
 cloud.<br>
<br>
&gt;&gt;&gt; solution space. Instead, you could mention that setting up sec=
ured channels<br>
between cars that cross one another might not complete in time to establish=
 the<br>
communication channel, and that the innocuousness must come from zerotrust =
in<br>
the transactions between the cars.<br>
=C2=A0 =C2=A0For the IPv6 ND, the DAD is required to ensure the uniqueness =
of the<br>
=C2=A0 =C2=A0IPv6 address of a vehicle&#39;s wireless interface.<br>
<br>
&gt;&gt;&gt; for classical ND (SLAAC) that=E2=80=99s true. That is not with=
 RFC 8505, since the<br>
infra maintains a table of all addresses in use in the prefix and blocks<br=
>
duplicates without the RFC 4862 DAD method. The stateful autoconf address g=
rant<br>
is immediate.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This DAD can be used<br>
=C2=A0 =C2=A0as a flooding attack that uses the DAD-related ND packets<br>
=C2=A0 =C2=A0disseminated over the VANET or vehicular networks.<br>
<br>
&gt;&gt;&gt; also for DOS attacks. You can block a owner from using an addr=
ess. A<br>
reference to rfc6959 is much needed here.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0This possibility<br>
=C2=A0 =C2=A0indicates that the vehicles and IP-RSUs need to filter out sus=
picious<br>
=C2=A0 =C2=A0ND traffic in advance.=C2=A0 Based on the SEND [RFC3971] mecha=
nism, the<br>
=C2=A0 =C2=A0authentication for routers (i.e., IP-RSUs) can be conducted by=
 only<br>
=C2=A0 =C2=A0selecting an IP-RSU that has a certification path toward trust=
ed<br>
=C2=A0 =C2=A0parties.=C2=A0 For authenticating other vehicles, the cryptogr=
aphically<br>
=C2=A0 =C2=A0generated address (CGA) can be used to verify the true owner o=
f a<br>
=C2=A0 =C2=A0received ND message, which requires to use the CGA ND option i=
n the<br>
=C2=A0 =C2=A0ND protocols.=C2=A0 For a general protection of the ND mechani=
sm, the RSA<br>
=C2=A0 =C2=A0Signature ND option can also be used to protect the integrity =
of the<br>
=C2=A0 =C2=A0messages by public key signatures.=C2=A0 For a more advanced<b=
r>
=C2=A0 =C2=A0authentication mechanism, a distributed blockchain-based mecha=
nism<br>
=C2=A0 =C2=A0[Vehicular-BlockChain] can be used.<br>
<br>
&gt;&gt;&gt; solution space. Again, the draft should focus on problems and =
needs. The<br>
problem here is that SEND is complex, and not implemented in the major stac=
k.<br>
It relies on PKI for trusting the router. The V2I need is a zerotrust model=
<br>
where one V, the other local Vs, and the I, can help each other anonymously=
 and<br>
harmlessly. &lt;snip&gt;<br>
<br>
8.=C2=A0 Informative References<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&lt;snip&gt;<br>
<br>
Voila!<br>
<br>
Keep safe;<br>
<br>
Pascal<br>
<br>
<br>
<br>
_______________________________________________<br>
its mailing list<br>
<a href=3D"mailto:its@ietf.org" target=3D"_blank">its@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/its" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/its</a><br>
</blockquote></div>

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Date: Thu, 2 Sep 2021 16:17:38 +0900
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
Cc: "int-dir@ietf.org" <int-dir@ietf.org>, Last Call <last-call@ietf.org>,  "draft-ietf-ipwave-vehicular-networking.all@ietf.org" <draft-ietf-ipwave-vehicular-networking.all@ietf.org>,  "its@ietf.org" <its@ietf.org>, Russ Housley <housley@vigilsec.com>,  CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es>,  skku-iotlab-members <skku-iotlab-members@googlegroups.com>, Chris Shen <shenyiwen7@gmail.com>,  "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
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Subject: Re: [Int-dir] [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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Hi Pascal,
I sincerely appreciate your super-fast feedback.
I will address your comments and submit the revision today.

Thanks.

Best Regards,
Paul

On Thu, Sep 2, 2021 at 3:49 PM Pascal Thubert (pthubert) <pthubert@cisco.co=
m>
wrote:

> Hello Paul
>
>
>
> This is absolutely excellent. I=E2=80=99m very happy will all the changes=
 and your
> attached pdf made my life as a reviewer a lot simpler.
>
>
>
> This is really a great way of progressing together. Many thanks for that!
>
>
>
> I=E2=80=99m all good but for a little snippet in the new text which is ac=
tually
> incorrect, and denotes a usual misunderstanding of RPL that your doc may
> help correct for the future:
>
>
>
> =E2=80=9C
>
> Although RPL can be used in IPv6-based vehicular networks, it is primaril=
y
> designed for lossy
>
> networks, which puts energy efficiency first. In addition, the topology i=
t
> considers may not
>
> quickly scale up and down for IPv6-based vehicular networks, since the
> mobility of vehicles is
>
> much more diverse with a high speed, so it can frequently alter a
> tree-like topology formed by
>
> RPL, which may cause network fragmentation and merging with more control
> traffic
>
> =E2=80=9C
>
>
>
>
>
> The roots of my contribution to RPL are in vehicular networks, exactly th=
e
> use case you describe. Based on that experience (including some actual te=
st
> with NASA) I=E2=80=99d change the text above with:
>
>
>
>
>
> =E2=80=9C
>
> RPL is primarily designed to minimize the control plane activity, that is
> the relative amount of routing protocol exchanges vs. data traffic; this
> approach is beneficial for situations where the power and bandwidth are
> scarce (e.g., an IoT LLN where RPL is typically used today), but also in
> situations of high relative mobility between the nodes in the network (ak=
a
> swarming, e.g., within a variable set of vehicles with a similar global
> motion, or a toon of drones).
>
> To reduce the routing exchanges, RPL leverages a Distance Vector approach=
,
> which does not need a global knowledge of the topology, and only optimize=
s
> the routes to and from the root, allowing P2P paths to be stretched.
> Although RPL installs its routes proactively, it only maintains them
> lazily, in reaction to actual traffic, or as a slow background activity.
> Additionally, RPL leverages the concept of an objective function, which
> allows to adapt the activity of the routing protocol to the use case, e.g=
.,
> type, speed, and quality of the radios. RPL does not need converge, and
> provides connectivity to most nodes most of the time. The default route
> towards the Root is maintained aggressively and may change while a packet
> progresses without causing loops, so the packet will still reach the root=
.
> In non-storing mode, a node inside the mesh/swarm that changes its point(=
s)
> of attachment to the graph informs the root with a single unicast packet
> the flows along the default route, and the connectivity is restored
> immediately; this mode is preferable for use cases where internet
> connectivity is dominant. OTOH, in storing mode, the routing stretch is
> reduced, for a better P2P connectivity, while the internet connectivity i=
s
> restored more slowly, time for the DV operation to operate hop-by-hop.
> While a RPL topology can quickly scale up and down and fits the needs of
> mobility of vehicles, the total performance of the system will also depen=
d
> on how quickly a node can form an address, join the mesh (including AAA),
> and manage its global mobility to become reachable from outside the mesh.
>
> =E2=80=9C
>
>
>
> Otherwise, all good!
>
>
>
> Take care,
>
>
>
> Pascal
>
>
>
>
>
> *From:* Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
> *Sent:* lundi 30 ao=C3=BBt 2021 15:12
> *To:* Pascal Thubert (pthubert) <pthubert@cisco.com>
> *Cc:* int-dir@ietf.org; Last Call <last-call@ietf.org>;
> draft-ietf-ipwave-vehicular-networking.all@ietf.org; its@ietf.org; Russ
> Housley <housley@vigilsec.com>; CARLOS JESUS BERNARDOS CANO <
> cjbc@it.uc3m.es>; skku-iotlab-members <
> skku-iotlab-members@googlegroups.com>; Chris Shen <shenyiwen7@gmail.com>;
> Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
> *Subject:* Re: [ipwave] Intdir last call review of
> draft-ietf-ipwave-vehicular-networking-20
>
>
>
> Hi Pascal,
>
> Here is the revision (-21) of IPWAVE PS Draft:
>
>
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-network=
ing-21
>
>
>
> I attach the revision letter to show how I have addressed your comments o=
n
> the revision.
>
>
>
> Chris and I have worked for this revision together.
>
>
>
> If you have further comments, please let me know.
>
>
>
> Thanks.
>
>
>
> Best Regards,
>
> Paul
>
>
>
>
>
>
>
> On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert via Datatracker <
> noreply@ietf.org> wrote:
>
> Reviewer: Pascal Thubert
> Review result: Not Ready
>
> Dear authors
>
> In summary:
>
> I read a number of very good drafts collated in one, from the use cases
> that
> very complete and ready to publish, to the architecture and protocol
> solution
> in section 4 that would require more work for completeness.
>
> There are multiple instances in the use cases where protocols are listed
> coming
> out of the blue, e.g., the references to OMNI that seem artificially spre=
ad
> regardless of the context of the section. OMNI is used throughout, both a=
s
> an
> open ended toolbox, and as a carpet under which all problems can be hidde=
n.
>
> Reading this doc, OMNI shows as an interface to a software mobile router,
> with
> multiple of the device physical interfaces connected to the mobile router=
.
> This
> makes the stack very simple as the complexity moves to the router. But no=
w
> you
> have to implement the router. Presented as that, the OMNI router deserves
> its
> name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANET=
 (many to
> choose from) and NEMO (and all the MIP protocol family across address
> families), all the possible radio interfaces on which the ND problems go
> away
> by magic, and whatever else you want to put in there. Is that the
> intention?
>
> Instead of referring to OMNI for virtually anything, the doc should refer
> to
> MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),
> draft-nordmark-intarea-ippl for split subnets, and
> draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet
> models. And
> then you can say that all those components can be plugged in the OMNI
> router,
> and you can discuss which MANET and which MIP you want, including using
> OMNI=E2=80=99s
> built in mobility.
>
> Note that my objections are not against the OMNI design, it might be the
> perfect thing and I am already aware of use cases that could be served by=
 a
> P2MP interface like OMNI in conjunction with RFC8505 on the P2P
> subinterfaces
> (recycling the high level design we=E2=80=99ve been shipping for IPv4 / f=
rame
> relay for
> the last 30 years). My objection is of the way the draft uses [OMNI] as t=
he
> magic wand that solves all the problems when what you really do is throw
> them
> over the fence. I=E2=80=99d rather you focus on problems and use cases, f=
or which
> there=E2=80=99s excellent text, and indicate what needs to be done withou=
t making
> assumption on how the needful things will be solved.
>
> In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to s=
plit,
> keep all
> that=E2=80=99s use case and problem description and ship it, remove refer=
ences to
> protocols envisioned in the solution, and start the work on architecture
> of the
> solution and the protocol applicability statements separately. An alterna=
te
> would be to centralize the discussion on protocols to annex, and explain
> that
> protocol A or B could be envisioned in solution space because to over thi=
s
> gap
> or implement that function.
>
> In any fashion, the current text is not ready for publication as
> applicability
> statement, architecture and or/solution, so the related work should be
> removed
> from the main text. But I find it mostly ready for use case and problem
> statement, more below.
>
> Review:
>
> Abstract
>
>    This document discusses the problem statement and use cases of
>    IPv6-based vehicular networking for Intelligent Transportation
>    Systems (ITS).
>
> >>> The document goes beyond that; there was actually a thread at 6MAN
> where
> Bob Hinden said =E2=80=9C This document says it is a problem statement, b=
ut then
> becomes a solution document.   Might be better to cut it down to only the
> problem statement part. =E2=80=9C >>> Would you consider doing this? If n=
ot, why?
> Note:
> you may want to respond on 6MAN as well. >>> >>>I would have thought that
> the
> traditional steps of problem statement and applicability statement of
> existing
> work could be expected from IPWAVE too. >>> Please clarify the steps that
> you
> intend to follow next with this work.
>
> <snip>
>
> 1.  Introduction
>
> >>> Very readable and informative section, many thanks!
>
>    Along with these WAVE standards and C-V2X standards, regardless of a
>    wireless access technology under the IP stack of a vehicle, vehicular
>    networks can operate IP mobility with IPv6 [RFC8200] and Mobile IPv6
>    protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (PMIPv6)
>    [RFC5213], Distributed Mobility Management (DMM) [RFC7333], Locator/
>    ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Extended
>    Route Optimization (AERO) [RFC6706BIS]).
>
> >>> NEMO (RFC 3963) is not cited. Any reason why the vehicle would not
> transport a network?
>
> <snip>
>
>    This document describes use cases and a problem statement about
>    IPv6-based vehicular networking for ITS, which is named IPv6 Wireless
>    Access in Vehicular Environments (IPWAVE).  First, it introduces the
>    use cases for using V2V, V2I, and V2X networking in ITS.  Next, for
>    IPv6-based vehicular networks, it makes a gap analysis of current
>    IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Management,
>    and Security & Privacy), and then enumerates requirements for the
>    extensions of those IPv6 protocols, which are tailored to IPv6-based
>    vehicular networking.  Thus, this document is intended to motivate
>    development of key protocols for IPWAVE.
>
> >>>
>
> <snip>
>
> 2.  Terminology
>
> >>>
>
> <snip>
>
>    o  IP-OBU: "Internet Protocol On-Board Unit": An IP-OBU denotes a
>       computer situated in a vehicle (e.g., car, bicycle, autobike,
>       motor cycle, and a similar one) and a device (e.g., smartphone and
>       IoT device).  It has at least one IP interface that runs in IEEE
>       802.11-OCB and has an "OBU" transceiver.  Also, it may have an IP
>       interface that runs in Cellular V2X (C-V2X) [TS-23.285-3GPP]
>       [TR-22.886-3GPP][TS-23.287-3GPP].  See the definition of the term
>       "OBU" in [RFC8691].
>
> >>> Can that be a router connecting multiple computers?
>
> <snip>
>
> 3.  Use Cases
>
> >>> This is another great read and an enlightening section. Maybe mention
> in
> the abstract that the doc also covers use cases?
>
> <snip>
>
>    Although a Layer-2 solution can provide a support for multihop
>    communications in vehicular networks, the scalability issue related
>    to multihop forwarding still remains when vehicles need to
>    disseminate or forward packets toward multihop-away destinations.  In
>    addition, the IPv6-based approach for V2V as a network layer protocol
>    can accommodate multiple radio technologies as MAC protocols, such as
>    5G V2X and DSRC.  Therefore, the existing IPv6 protocol can be
>    augmented through the addition of an Overlay Multilink Network (OMNI)
>    Interface [OMNI] and/or protocol changes in order to support both
>    wireless single-hop/multihop V2V communications and multiple radio
>    technologies in vehicular networks.  In such a way, vehicles can
>    communicate with each other by V2V communications to share either an
>    emergency situation or road hazard in a highway having multiple kinds
>    of radio technologies, such as 5G V2X and DSRC.
>
> >>> This text appears in the middle of high level use case, with a crude
> list
> of protocols; this is not a place for it
>
> >>> On a 6MAN Thread, Brian Carpenter said that the above:
> =E2=80=9C
> is of concern regardless of the mention of OMNI. Does it mean "can be" or
> "needs to be"? This paragraph seems like a very short summary of a big
> problem
> area. At the end of page 13 there is some related discussion, which
> mentions
> RPL as part of the solution (good choice, IMHO) but again seems to depend
> on
> OMNI. I don't think the fix of simply removing references to OMNI works,
> because it would leave a gap. In an informational document, that is not a
> formal problem but as far as this draft describes architecture, I don't
> think
> that big a gap is reasonable. "OMNI" is mentioned more than 20 times in t=
he
> document. There are also several references to AERO, which is strongly
> associated with OMNI. =E2=80=9C >>> I agree with Brian. Here the document=
 seems to
> be
> mixing solution with problem and putting the cart before the horse. My
> recommendation is to stick to what needs to be done that IPv6 does not do
> yet
> -the reqs and gaps-; but the doc should not step in the how things will b=
e
> done
> unless the group already decided to do it. The logical next steps to a PS
> are
> an applicability statement of existing work, and if the gaps cannot be
> filled,
> there may be one or more WG chartered to fill those gaps.
>
> >>> I=E2=80=99d still be happy to see an annex with leads on where the so=
lution
> might
> come from like RFC 8691 does.
>
> <snip>
>
>    The existing IPv6 protocol must be augmented through the addition of
>    an OMNI interface and/or protocol changes in order to support
>    wireless multihop V2I communications in a highway where RSUs are
>    sparsely deployed, so a vehicle can reach the wireless coverage of an
>    RSU through the multihop data forwarding of intermediate vehicles.
>    Thus, IPv6 needs to be extended for multihop V2I communications.
>
> >>> Note that I have no clue on how well OMNI applies in that space, mayb=
e
> it
> does very well; but here it comes out of the blue with no justification.
> If you
> mention OMNI you need to detail what it is and which of the V2V  problems
> you
> expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.
>
> <snip>
>
>    The existing IPv6 protocol must be augmented through the addition of
>    an OMNI interface and/or protocol changes in order to support
>    wireless multihop V2X (or V2I2X) communications in an urban road
>    network where RSUs are deployed at intersections, so a vehicle (or a
>    pedestrian's smartphone) can reach the wireless coverage of an RSU
>    through the multihop data forwarding of intermediate vehicles (or
>    pedestrians' smartphones).  Thus, IPv6 needs to be extended for
>    multihop V2X (or V2I2X) communications.
>
> >>> Please be more specific on what the missing functions are and whether
> they
> are missing from the stack development standpoint or if there=E2=80=99s w=
ork needed
> from the IETF. 1)      If something is really missing in our specs, the
> text to
> prove from the use case above is missing 2)      how OMNI serves the use
> case
> could be elaborated in an applicability statement of OMNI for V2xyz, but
> it is
> a bit blunt to present it as panacea when the problems to be solved are n=
ot
> listed. 3)      If you look at it, OMNI seems like a software mobile rout=
er
> within a bump in the stack. Can that become too big?
>
> >>> my view is that the text above and the similar occasions should be
> replaced
> by something like :
>
>    The existing IPv6 protocol must be augmented to provide the following
>    functions: 1) =E2=80=A6
>
> >>> and / or something like:
>
>    In addition to the IPv6 node requirements [RFC 8504], the IPv6 protoco=
l
>    stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=A6
>
> <snip>
>
>    To support applications of these V2X use cases, the functions of IPv6
>    such as VND, VMM, and VSP are prerequisites for IPv6-based packet
>    exchange, transport-layer session continuity, and secure, safe
>    communication between a vehicle and a pedestrian either directly or
>    indirectly via an IP-RSU.
>
> >>> =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=9D doe=
s not parse.
> There=E2=80=99s
> no IPv6 reference that provides those functions. If the intention is to s=
ay
> that there=E2=80=99s stuff to add to IPv6 to support, like, say,  VND, th=
en this
> document fails to define how an IPv6 VND should behave, though it=E2=80=
=99s
> precisely
> what I=E2=80=99d expect from a problem statement.
>
> <snip>
>
> 4.  Vehicular Networks
>
> >>> What is the purpose of section 4 as a whole, problem statement or
> applicability statement of the listed protocols? In the former case what=
=E2=80=99s
> the
> problem? In the latter case it is incomplete and needs to be exported to =
an
> applicability statement doc with all the possible technologies evaluated.
>
>    This section describes an example vehicular network architecture
>    supporting V2V, V2I, and V2X communications in vehicular networks.
>
> >>> I read this as presenting a context to explain what the problems are
> instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe us=
ing the term
> =E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=99=
s comment.
>
> <snip>
>
> 4.1.  Vehicular Network Architecture
>
>    Figure 1 shows an example vehicular network architecture for V2I and
>    V2V in a road network [OMNI].
>
> a.      Is using OMNI a decision that the WG made for the future work ?
> what
> does it do and what does it not do? b.      Is there work left to be done=
?
> Who
> will do that work? Or is it the expectation that OMNI has it all defined
> already?
>
> <snip>
>
>    An existing network architecture (e.g., an IP-based aeronautical
>    network architecture [OMNI][UAM-ITS], a network architecture of
>    PMIPv6 [RFC5213], and a low-power and lossy network architecture
>    [RFC6550]) can be extended to a vehicular network architecture for
>    multihop V2V, V2I, and V2X, as shown in Figure 1.  In a highway
>    scenario, a vehicle may not access an RSU directly because of the
>    distance of the DSRC coverage (up to 1 km).  For example, the OMNI
>    interface and/or RPL (IPv6 Routing Protocol for Low-Power and Lossy
>    Networks) [RFC6550] can be extended to support a multihop V2I since a
>    vehicle can take advantage of other vehicles as relay nodes to reach
>    the RSU.  Also, RPL can be extended to support both multihop V2V and
>    V2X in the similar way.
>
> >>> all this could fit well in annex; anyway you need to explain what you
> expect the protocols to do and which extension is needed. In the case of
> RPL at
> least you indicate that it would do routing, but not why you cannot use i=
t
> of
> the shelf; for OMNI, what you expect is less clear, though there=E2=80=99=
s text
> elsewhere about the many radio interfaces that could be used for the
> purpose,
> and the text in the UAM below that is enlightening.
>
> <snip>
>
>                                   To support not only the mobility
>    management of the UAM end systems, but also the multihop and
>    multilink communications of the UAM interfaces, the UAM end systems
>    can employ an Overlay Multilink Network (OMNI) interface [OMNI] as a
>    virtual Non-Broadcast Multiple Access (NBMA) connection to a serving
>    ground domain infrastructure.
>
> >>> Again, what is the expectation for OMNI? As an overlay it requires an
> underlay; when connecting to a MANET it needs support for that MANET. The
> text
> above seems to imply that is solves everything in V2xyz like magic;
> reminds me
> of the IPv6 multicast abstraction that was supposed to solve the broadcas=
t
> problem and ended up worsening it.
>
> <snip>
>
>                             This infrastructure can be configured
>    over the underlying data links.  The OMNI interface and its link
>    model provide a means of multilink, multihop and mobility
>    coordination to the legacy IPv6 ND messaging [RFC4861] according to
>    the NBMA principle.  Thus, the OMNI link model can support efficient
>    UAM internetworking services without additional mobility messaging,
>    and without any modification to the IPv6 ND messaging services or
>    link model.
>
> >>> Again, what is the expectation for OMNI? As an overlay it requires an
> underlay; the text above seems to imply that is solves everything in V2xy=
z
> like
> magic; that would be a stretch, that reminds me of IPv6 multicast that wa=
s
> supposed to solve the broadcast problem and ended up worsening it.
>
> <snip>
>
>    Multiple vehicles under the coverage of an RSU share a prefix just as
>    mobile nodes share a prefix of a Wi-Fi access point in a wireless
>    LAN.  This is a natural characteristic in infrastructure-based
>    wireless networks.  For example, in Figure 1, two vehicles (i.e.,
>    Vehicle2, and Vehicle5) can use Prefix 1 to configure their IPv6
>    global addresses for V2I communication.  Alternatively, mobile nodes
>    can employ an OMNI interface and use their own IPv6 Unique Local
>    Addresses (ULAs) [RFC4193] over the wireless network without
>    requiring the messaging of IPv6 Stateless Address Autoconfiguration
>   (SLAAC) [RFC4862], which uses an on-link prefix provided by the
>    (visited) wireless LAN; this technique is known as "Bring-Your-Own-
>    Addresses".
>
> >>>  Is OMNI the only way to "Bring-Your-Own-Addresses=E2=80=9D? Else the=
 text
> could be
> more generic, at least use e.g., like the ref to AERO later. >>> What are
> the
> implications / limitations of doing that =E2=80=93 like they can do line =
of sight
> V2V
> but not reach the internet, or the need of  a local MANET / RPL that will
> accept to route those addresses, or the security / address ownership
> validation
> issues ?
>
> <snip>
>
>    A single subnet prefix announced by an RSU can span multiple vehicles
>    in VANET.  For example, in Figure 1, for Prefix 1, three vehicles
>    (i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a connected
>    VANET.  Also, for Prefix 2, two vehicles (i.e., Vehicle3 and
>    Vehicle6) can construct another connected VANET, and for Prefix 3,
>    two vehicles (i.e., Vehicle4 and Vehicle7) can construct another
>    connected VANET.  Alternatively, each vehicle could employ an OMNI
>    interface with their own ULAs such that no topologically-oriented
>    subnet prefixes need be announced by the RSU.
>
> >>>  same as above. This seems to restate the same thing, derive an addre=
ss
> from a topologically correct prefix or use your own with limitations to b=
e
> described.
>
> <snip>
>
>    For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]
>    specifies several details, including Maximum Transmission Unit (MTU),
>    frame format, link-local address, address mapping for unicast and
>    multicast, stateless autoconfiguration, and subnet structure.  An
>    Ethernet Adaptation (EA) layer is in charge of transforming some
>    parameters between the IEEE 802.11 MAC layer and the IPv6 network
>    layer, which is located between the IEEE 802.11-OCB's logical link
>    control layer and the IPv6 network layer.  This IPv6 over 802.11-OCB
>    can be used for both V2V and V2I in IPv6-based vehicular networks.
>
> >>>  solution space.
>
> <snip>
>
>    An IPv6 mobility solution is needed for the guarantee of
>    communication continuity in vehicular networks so that a vehicle's
>    TCP session can be continued, or UDP packets can be delivered to a
>    vehicle as a destination without loss while it moves from an IP-RSU's
>    wireless coverage to another IP-RSU's wireless coverage.  In
>    Figure 1, assuming that Vehicle2 has a TCP session (or a UDP session)
>    with a corresponding node in the vehicular cloud, Vehicle2 can move
>    from IP-RSU1's wireless coverage to IP-RSU2's wireless coverage.  In
>    this case, a handover for Vehicle2 needs to be performed by either a
>    host-based mobility management scheme (e.g., MIPv6 [RFC6275]) or a
>    network-based mobility management scheme (e.g., PMIPv6 [RFC5213] and
>    AERO [RFC6706BIS]).
>
>    In the host-based mobility scheme (e.g., MIPv6), an IP-RSU plays a
>    role of a home agent.  On the other hand, in the network-based
>    mobility scheme (e.g., PMIPv6, an MA plays a role of a mobility
>    management controller such as a Local Mobility Anchor (LMA) in
>    PMIPv6, which also serves vehicles as a home agent, and an IP-RSU
>    plays a role of an access router such as a Mobile Access Gateway
>    (MAG) in PMIPv6 [RFC5213].  The host-based mobility scheme needs
>    client functionality in IPv6 stack of a vehicle as a mobile node for
>    mobility signaling message exchange between the vehicle and home
>    agent.  On the other hand, the network-based mobility scheme does not
>    need such a client functionality for a vehicle because the network
>    infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility agent
>    handles the mobility signaling message exchange with the home agent
>    (e.g., LMA in PMIPv6) for the sake of the vehicle.
>
>    There are a scalability issue and a route optimization issue in the
>    network-based mobility scheme (e.g., PMIPv6) when an MA covers a
>    large vehicular network governing many IP-RSUs.  In this case, a
>    distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate the
>    scalability issue by distributing multiple MAs in the vehicular
>    network such that they are positioned closer to vehicles for route
>    optimization and bottleneck mitigation in a central MA in the
>    network-based mobility scheme.  All these mobility approaches (i.e.,
>    a host-based mobility scheme, network-based mobility scheme, and
>    distributed mobility scheme) and a hybrid approach of a combination
>    of them need to provide an efficient mobility service to vehicles
>    moving fast and moving along with the relatively predictable
>    trajectories along the roadways.
>
>    In vehicular networks, the control plane can be separated from the
>    data plane for efficient mobility management and data forwarding by
>    using the concept of Software-Defined Networking (SDN)
>    [RFC7149][DMM-FPC].  Note that Forwarding Policy Configuration (FPC)
>    in [DMM-FPC], which is a flexible mobility management system, can
>    manage the separation of data-plane and control-plane in DMM.  In
>    SDN, the control plane and data plane are separated for the efficient
>    management of forwarding elements (e.g., switches and routers) where
>    an SDN controller configures the forwarding elements in a centralized
>    way and they perform packet forwarding according to their forwarding
>    tables that are configured by the SDN controller.  An MA as an SDN
>    controller needs to efficiently configure and monitor its IP-RSUs and
>    vehicles for mobility management, location management, and security
>    services.
>
>    The mobility information of a GPS receiver mounted in its vehicle
>    (e.g., position, speed, and direction) can be used to accommodate
>    mobility-aware proactive handover schemes, which can perform the
>    handover of a vehicle according to its mobility and the wireless
>    signal strength of a vehicle and an IP-RSU in a proactive way.
>
>    Vehicles can use the TCC as their Home Network having a home agent
>    for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5213],
>    so the TCC (or an MA inside the TCC) maintains the mobility
>    information of vehicles for location management.  IP tunneling over
>    the wireless link should be avoided for performance efficiency.
>    Also, in vehicular networks, asymmetric links sometimes exist and
>    must be considered for wireless communications such as V2V and V2I.
>
> >>>  This is all very informative text but does not state a problem. Is
> there a
> problem is left to be solved or are we assessing the applicability of
> protocols? Could it for instance, forward point to issues discussed in
> section
> 5?
>
> <snip>
>
>    As shown in Figure 3, as internal networks, a vehicle's moving
>    network and an EN's fixed network are self-contained networks having
>    multiple subnets and having an edge router (e.g., IP-OBU and IP-RSU)
>    for the communication with another vehicle or another EN.  The
>    internetworking between two internal networks via V2I communication
>    requires the exchange of the network parameters and the network
>    prefixes of the internal networks.  For the efficiency, the network
>    prefixes of the internal networks (as a moving network) in a vehicle
>    need to be delegated and configured automatically.  Note that a
>    moving network's network prefix can be called a Mobile Network Prefix
>    (MNP) [OMNI].
>
> >>> Then again you=E2=80=99re overselling OMNI. MNP is originally defined=
 here
> https://datatracker.ietf.org/doc/html/rfc3963#section-2 and that=E2=80=99=
s a
> reference
> you can use normatively.
>
> <snip>
>
>    As shown in Figure 3, the addresses used for IPv6 transmissions over
>    the wireless link interfaces for IP-OBU and IP-RSU can be either
>    global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets can be
>    routed within vehicular networks [OMNI].
>
> >>> Then again you=E2=80=99re overselling OMNI. There needs to  be a rout=
ing
> protocol
> like a MANET that will accept to carry the
>  MNPs, and that must be implemented by the infra and both cars. The OMNI
> spec
>  is clear on that. This is why at first glance I see OMNI as a full mobil=
e
>  router in a bump in the stack. Now what is the problem behind this? No
> such
>  protocol at IETF? Too many to choose from? No deployment?
> <snip>
>
> When global IPv6 addresses
>    are used, wireless interface configuration and control overhead for
>    Duplicate Address Detection (DAD) [RFC4862] and Multicast Listener
>    Discovery (MLD) [RFC2710][RFC3810] should be minimized to support V2I
>    and V2X communications for vehicles moving fast along roadways; when
>    ULAs and the OMNI interface are used, no DAD nor MLD messaging is
>    needed.
>
> >>> Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it the no d=
ad needed a
> property
> of injecting a BYOA in the fabric for an GUA MIP Home Address which is
> known to
> be unique at home? >>> OTOH, autoconf=E2=80=99ing a random ULA =E2=80=9CF=
D=E2=80=A6=E2=80=9Dprefix has
> lesser
> DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classica=
l subnet.
> So
> who says DAD isn=E2=80=99t required for OMNI ULA? >>> note that IMHO DAD =
on
> wireless is
> a lot more harm than good, and I agree that with a good pseudo random
> generator
> the ULA has no chance to collision in the real world, as OMNI claims. It=
=E2=80=99s
> just
> that your argument here plays the other way, because there are less rando=
m
> bits
> (56)  in the ULA prefix than in the IID (62), and if one starts using mor=
e
> prefix bits to be non-random, there will be a time when DAD on prefix is
> needed.
>
> <snip>
>
>    Let us consider the upload/download time of a vehicle when it passes
>    through the wireless communication coverage of an IP-RSU.  For a
>    given typical setting where 1km is the maximum DSRC communication
>    range [DSRC] and 100km/h is the speed limit in highway, the dwelling
>    time can be calculated to be 72 seconds by dividing the diameter of
>    the 2km (i.e., two times of DSRC communication range where an IP-RSU
>    is located in the center of the circle of wireless communication) by
>    the speed limit of 100km/h (i.e., about 28m/s).  For the 72 seconds,
>    a vehicle passing through the coverage of an IP-RSU can upload and
>    download data packets to/from the IP-RSU.
>
> <snip>
>
> 4.3.  V2V-based Internetworking
>
> >>> In this section it looks like the cars are in a stable line of sight
> relationship. Which is probably fine for a platoon, but when you drive
> along
> with friends in different cars, you realize that the line of sight
> assumption
> does not stand over time. Soon enough, other cars meddle in, and possibly
> one
> of the cars drives faster and too far ahead so you need the infra to rela=
y,
> possibly over multiple infra hops.
>
> >>> so in this section, I=E2=80=99d expect to see a Vehicle communicating=
 with
> another
> one and using either line of sight or V2V relaying but also using relay
> via V2I
> (multihop I2I not just hub and spoke V2I2V ), alternatively to together f=
or
> redundancy. Is that part of the problem?
>
> >>> reading deeper section 5 I found excellent text on routing via V and
> via I.
> This tells that section 4 does not play a good role at justifying section
> 5.
> Maybe keep section 4 for another doc?
>
> >>> What kind or reliability is required in a V2V use case? Do you think
> ND can
> handle it? Or MANET? What would be the assumption on L2 (roaming time,
> unicast
> vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3
> redundancy?
>
> <snip>
>
> 5.  Problem Statement
>
> <snip>
>
>    In order to specify protocols using the architecture mentioned in
>    Section 4.1, IPv6 core protocols have to be adapted to overcome
>    certain challenging aspects of vehicular networking.  Since the
>    vehicles are likely to be moving at great speed, protocol exchanges
>    need to be completed in a time relatively short compared to the
>    lifetime of a link between a vehicle and an IP-RSU, or between two
>    vehicles.
>
> >>> Any order of magnitude?
> >>> Can you indicate whether this already rules out certain procedures,
> e.g.
> DAD ?
>
>    The lifetime of a session varies depending on the session's type such
>    as a web surfing, voice call over IP, and DNS query.  Regardless of a
>    session's type, to guide all the IPv6 packets to their destination
>    host, IP mobility should be supported for the session.
>
> >>> this seems to be for unicast when you know who to talk to. Is there a
> need
> some multicast groups like anybody around interested in topic blah like I
> could
> be multicasting the speed of vehicles coming the other way that I crossed
> recently, for use of vehicles that I=E2=80=99m crossing now, so they can =
see a
> slowdown
> on advance
>
>    Thus, the time constraint of a wireless link has a major impact on
>    IPv6 Neighbor Discovery (ND).  Mobility Management (MM) is also
>    vulnerable to disconnections that occur before the completion of
>    identity verification and tunnel management.  This is especially true
>    given the unreliable nature of wireless communication.  This section
>    presents key topics such as neighbor discovery and mobility
>    management.
>
> >>> Only ND? What about the MANET?
> >>> how fast should ND be to be suitable?
> >>> is there also a bandwidth check? You can make things much faster if y=
ou
> dedicate a lot of spectrum to it. But that can also be a waste.
>
> 5.1.  Neighbor Discovery
>
> <snip>
>
>    The requirements for IPv6 ND for vehicular networks are efficient DAD
>    and NUD operations.
>
> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast,
> which
> is a good idea in my book?
>
>  <snip>
>
>       This merging and partitioning should be considered for the
>    IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAAC)
>    [RFC4862].
>
> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast,
> which
> is a good idea in my book?
>
>  <snip>
>
>    Also, the partitioning of a VANET may make vehicles with the same
>    prefix be physically unreachable.  Also, SLAAC needs to prevent IPv6
>    address duplication due to the merging of VANETs.  According to the
>    merging and partitioning, a destination vehicle (as an IPv6 host)
>    needs to be distinguished as either an on-link host or an off-link
>    host even though the source vehicle uses the same prefix as the
>    destination vehicle.
>
> >>> should reference to draft-nordmark-intarea-ippl
>
>    To efficiently prevent IPv6 address duplication due to the VANET
>    partitioning and merging from happening in vehicular networks, the
>    vehicular networks need to support a vehicular-network-wide DAD by
>    defining a scope that is compatible with the legacy DAD.  In this
>    case, two vehicles can communicate with each other when there exists
>    a communication path over VANET or a combination of VANETs and IP-
>    RSUs, as shown in Figure 1.  By using the vehicular-network-wide DAD,
>    vehicles can assure that their IPv6 addresses are unique in the
>    vehicular network whenever they are connected to the vehicular
>    infrastructure or become disconnected from it in the form of VANET.
>
> >>> Excellent
>
>    ND time-related parameters such as router lifetime and Neighbor
>    Advertisement (NA) interval need to be adjusted for vehicle speed and
>    vehicle density.  For example, the NA interval needs to be
>    dynamically adjusted according to a vehicle's speed so that the
>    vehicle can maintain its neighboring vehicles in a stable way,
>    considering the collision probability with the NA messages sent by
>    other vehicles.
>
> >>> Is that a problem or just an operational setting that needs to be
> found?
> >>> Do we need to reconsider the concepts of those timers?
>
> <snip>
>
>    Thus, in IPv6-based vehicular networking, IPv6 ND should have minimum
>    changes for the interoperability with the legacy IPv6 ND used in the
>    Internet, including the DAD and NUD operations.
>
> >>> I do not find the logical link with the text before, why is this a
> =E2=80=9Cthus=E2=80=9D?
> >>> why should the ND inside the VANET be constrained to be interoperable=
?
> This
> may place constraints on the solution.
>
> 5.1.1.  Link Model
>
>    A prefix model for a vehicular network needs to facilitate the
>
> >>> Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=80=9Cp=
refix model=E2=80=9D.
> >>> it would make this piece and the next should refer to
> draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both
> link
> and subnet issues. The general ideas are the same, but the gory details
> here
> are slightly incorrect, like this notion of prefix model than comes out o=
f
> the
> blue. The model is really the subnet model for the subnet associated to
> P2MP.
>
>    communication between two vehicles with the same prefix regardless of
>    the vehicular network topology as long as there exist bidirectional
>    E2E paths between them in the vehicular network including VANETs and
>    IP-RSUs.  This prefix model allows vehicles with the same prefix to
>    communicate with each other via a combination of multihop V2V and
>    multihop V2I with VANETs and IP-RSUs.  Note that the OMNI interface
>    supports an NBMA link model where multihop V2V and V2I communications
>    use each mobile node's ULAs without need for any DAD or MLD
>    messaging.
>
> >>> again overselling OMNI.
> >>> I kinda agree about the OMNI interface model, nothing against that.
> But you
> must see that there needs a lot more than what the OMNI interface to get
> packets across V and I hops to the destination. Like routing ala MANET,
> redundancy handling ala DetNet because it will be very lossy, path
> management
> ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND so=
 it does
> not
> solve the ND problems above.
>
>    IPv6 protocols work under certain assumptions that do not necessarily
>    hold for vehicular wireless access link types other than OMNI/NBMA
>    [VIP-WAVE][RFC5889]; the rest of this section discusses implications
>    for those link types that do not apply when the OMNI/NBMA link model
>
> >>> again overselling OMNI.
> >>> The keyword here is P2MP / NBMA, and OMNI is one interface that accep=
ts
> that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already P=
2MP /
> NBMA,
> using routing to complete the partial mesh in P2MP. The text seems to imp=
ly
> that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI =
is loaded
> with
> other stuff than a plain P2MP capable interface. And ND over P2MP is not
> done
> by OMNI, OMNI only makes classical ND worse and only works in a full mesh=
.
> OTOH
> RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work ver=
y
> well
> within an OMNI interface and solve those problems. >>> My point is that y=
ou
> need to tell the full story or refrain from entering solution space in
> this doc
>
> <snip>
>
>    There is a relationship between a link and a prefix, besides the
>    different scopes that are expected from the link-local and global
>    types of IPv6 addresses.  In an IPv6 link, it is assumed that all
>    interfaces which are configured with the same subnet prefix and with
>    on-link bit set can communicate with each other on an IPv6 link.
>
> >>> not assumed; that=E2=80=99s what the onlink but set tells. The conclu=
sion
> should be
> that the VANET cannot set the O bit.
>
>    However, the vehicular link model needs to define the relationship
>    between a link and a prefix, considering the dynamics of wireless
>    links and the characteristics of VANET.
>
> <snip>
>
>    From the previous observation, a vehicular link model should consider
>    the frequent partitioning and merging of VANETs due to vehicle
>    mobility.  Therefore, the vehicular link model needs to use an on-
>    link prefix and off-link prefix according to the network topology of
>    vehicles such as a one-hop reachable network and a multihop reachable
>
> >>> No, the once a node saw a O bit set that sticks even if it sees other
> advertisements of the PIO with the O bit not set. >>> This is a global an=
d
> intrinsic property of the prefix (and an attack vector that could be
> mentioned
> in the sec section). >>> the VANET prefix must never come with the O bit
> set.
>
> <snip>
>
>    network (or partitioned networks).  If the vehicles with the same
>    prefix are reachable from each other in one hop, the prefix should be
>    on-link.
>
> >>>> No, see above; but the router may redirect though it is really risky
> unless this is a stable situation like a parking place.
>
>    Thus, in IPv6-based vehicular networking, the vehicular link model
>    should have minimum changes for interoperability with standard IPv6
>    links in an efficient fashion to support IPv6 DAD, MLD and NUD
>    operations.  When the OMNI NBMA link model is used, there are no link
>    model changes nor DAD/MLD messaging required.
>
> >>>> again overselling OMNI.
> >>>> You need a good P2MP subnet model with routing support when the mesh
> is
> partial. My company alone has been shipping million of nodes that build
> subnets
> of thousands, and that was done using IETF standards.
>
> <snip>
>
>    For vehicular networks with high mobility and density, the DAD needs
>    to be performed efficiently with minimum overhead so that the
>    vehicles can exchange a driving safety message (e.g., collision
>    avoidance and accident notification) with each other with a short
>    interval (e.g., 0.5 second) by a technical report from NHTSA
>    (National Highway Traffic Safety Administration) [NHTSA-ACAS-Report].
>    Such a driving safety message may include a vehicle's mobility
>    information (i.e., position, speed, direction, and acceleration/
>    deceleration).  The exchange interval of this message is 0.5 second,
>    which is required to allow a driver to avoid a rear-end crash from
>    another vehicle.
>
> >>> IPv6 over broadcast MAC (used to be called internet 0, 10+ years ago)
> solves that MAC issue since there is no MAC.
>
> 5.1.3.  Routing
>
>    For multihop V2V communications in either a VANET or VANETs via IP-
>    RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing protocol may
>    be required to support both unicast and multicast in the links of the
>    subnet with the same IPv6 prefix.  However, it will be costly to run
>    both vehicular ND and a vehicular ad hoc routing protocol in terms of
>    control traffic overhead [ID-Multicast-Problems].
>
> >>> we do that with IETF standards on battery operated devices already.
> Using
> RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve s=
een 30
> hops in
> meshes of thousands in the real world though it=E2=80=99s not the normal
> operational
> model, but can happen to maintain connectivity during the reboot of a
> root) and
> does not use broadcast. RPL was initially designed as a V2V2V protocol bu=
t
> found its market on the IoT. I=E2=80=99m sure the protocol would gladly c=
ome back
> to
> its roots.
>
>    A routing protocol for a VANET may cause redundant wireless frames in
>    the air to check the neighborhood of each vehicle and compute the
>    routing information in a VANET with a dynamic network topology
>    because the IPv6 ND is used to check the neighborhood of each
>    vehicle.  Thus, the vehicular routing needs to take advantage of the
>    IPv6 ND to minimize its control overhead.
>
> >>> A clean description of the interaction of RPL and RFC 8505 in our IoT
> networks. Note that the speed of the PHY in VANET balanced the instabilit=
y
> of
> the topology, and RPL still applies. Note also that RPL uses DV with a
> routing
> stretch in order to minimize the topology awareness that=E2=80=99s needed=
 in each
> node,
> which results in minimal signaling.
>
> 5.2.  Mobility Management
>
> <snip>
>
>    For a mobility management scheme in a shared link, where the wireless
>    subnets of multiple IP-RSUs share the same prefix, an efficient
>    vehicular-network-wide DAD is required.  If DHCPv6 is used to assign
>    a unique IPv6 address to each vehicle in this shared link,
>
> >>> I would not use the term link, or shared. Maybe shared link -> domain=
?
> <snip>
>
> the DAD is
>    not required.  On the other hand, for a mobility management scheme
>    with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] and OMNI
>    [OMNI]), DAD is not required because the IPv6 address of a vehicle's
>    external wireless interface is guaranteed to be unique.
>
> >>> again overselling OMNI
> >>> As I said earlier, this is wring there are (64*) more chances of a
> collision in OMNI prefixes than in IPv6 IIDs. >>> OMNI prefixes can
> collision,
> home addresses that are unique on a home network cannot. >>> Now if both
> the
> OMNI prefix and the IID are good randoms, then obviously, the chances of
> collisions round up to 0. >>> Collision is certainly not my worst fear.
>
>   There is a
>    tradeoff between the prefix usage efficiency and DAD overhead.  Thus,
>    the IPv6 address autoconfiguration for vehicular networks needs to
>    consider this tradeoff to support efficient mobility management.
>
> >>> This is way too superficial and hides the reality of things.
> - Using a VANET Infra prefix allows direct routability to the internet
> which
> BYOA does not since the BYOA is not topologically correct. Yes, it costs =
a
> DAD
> with classic ND, but it does not with RCF8505 and the draft fails to
> mention
> that. - A BYOA needs a tunnel home, and the node needs to know who is
> reachable
> inside the VANET and what is not to decide to tunnel or not; this is a
> difficult problem (vs. control place overhead) that is not discussed here=
.
>
> <snip>
>
>    For the case of a multihomed network, a vehicle can follow the first-
>    hop router selection rule described in [RFC8028].  That is, the
>    vehicle should select its default router for each prefix by
>    preferring the router that advertised the prefix.
>
> >>> Still router discovery (in and out) must be very fast. Thing of the R=
A
> intervale in MIPv6. Is that sufficient? Too expensive?
>
> <snip>
>
> 6.  Security Considerations
> >>> Any discussion on the security of classical ND and other operational
> issues
> (rfc6583) ?
>
> <snip>
>
>    Security and privacy are paramount in V2I, V2V, and V2X networking.
>    Vehicles and infrastructure must be authenticated in order to
>    participate in vehicular networking.  Also, in-vehicle devices (e.g.,
>    ECU) and a driver/passenger's mobile devices (e.g., smartphone and
>    tablet PC) in a vehicle need to communicate with other in-vehicle
>    devices and another driver/passenger's mobile devices in another
>    vehicle, or other servers behind an IP-RSU in a secure way.  Even
>    though a vehicle is perfectly authenticated and legitimate, it may be
>    hacked for running malicious applications to track and collect its
>    and other vehicles' information.  In this case, an attack mitigation
>    process may be required to reduce the aftermath of malicious
>    behaviors.
>
> >>> The section should mention that both with classical ND and BYOA,
> addresses
> can be impersonated, and RFC 8928 protects against that in both cases whi=
le
> maintaining privacy.
>
>    Even though vehicles can be authenticated with valid certificates by
>    an authentication server in the vehicular cloud, the authenticated
>
> >>> Is PKI feasible (deploying it in every car?). Is it fast enough? Is i=
t
> really what IPWAVE thinks vehicle should use????? >>> e.g. why would one
> need
> to authenticate to a V2I network? >>> from the text earlier in the doc, i=
t
> seemed that what you really want is access that is fast to join, capable =
of
> offering the reachability you want, anonymous, and innocuous (cars can no=
t
> harm
> one another).
>
>    vehicles may harm other vehicles, so their communication activities
>    need to be logged in either a central way through a logging server
>    (e.g., TCC) in the vehicular cloud or a distributed way (e.g.,
>    blockchain [Bitcoin]) along with other vehicles or infrastructure.
>    For the non-repudiation of the harmful activities of malicious nodes,
>    a blockchain technology can be used [Bitcoin].  Each message from a
>    vehicle can be treated as a transaction and the neighboring vehicles
>    can play the role of peers in a consensus method of a blockchain
>    [Bitcoin][Vehicular-BlockChain].  For a blockchain's efficient
>    consensus in vehicular networks having fast moving vehicles, a new
>    consensus algorithm needs to be developed or an existing consensus
>    algorithm needs to be enhanced.
>
> >>> solution space; better express the  security needs since this is a PS=
.
>
> <snip>
>
>    To identify malicious vehicles among vehicles, an authentication
>    method is required.
>
> >>> No. As said earlier a vehicle can be infected. You need
> innocuousness.which
> can come from things like isolation, zerotrust, and protocols that are
> difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 is
> protected by construction, anonymous, and fast.
>
> <snip>
>
>    For the setup of a secure channel over IPsec or TLS, the multihop V2I
>    communications over DSRC is required in a highway for the
>    authentication by involving multiple intermediate vehicles as relay
>    nodes toward an IP-RSU connected to an authentication server in the
>    vehicular cloud.  The V2I communications over 5G V2X (or LTE V2X) is
>    required to allow a vehicle to communicate directly with a gNodeB (or
>    eNodeB) connected to an authentication server in the vehicular cloud.
>
> >>> solution space. Instead, you could mention that setting up secured
> channels
> between cars that cross one another might not complete in time to
> establish the
> communication channel, and that the innocuousness must come from zerotrus=
t
> in
> the transactions between the cars.
>    For the IPv6 ND, the DAD is required to ensure the uniqueness of the
>    IPv6 address of a vehicle's wireless interface.
>
> >>> for classical ND (SLAAC) that=E2=80=99s true. That is not with RFC 85=
05, since
> the
> infra maintains a table of all addresses in use in the prefix and blocks
> duplicates without the RFC 4862 DAD method. The stateful autoconf address
> grant
> is immediate.
>
>                                This DAD can be used
>    as a flooding attack that uses the DAD-related ND packets
>    disseminated over the VANET or vehicular networks.
>
> >>> also for DOS attacks. You can block a owner from using an address. A
> reference to rfc6959 is much needed here.
>
> <snip>
>
>  This possibility
>    indicates that the vehicles and IP-RSUs need to filter out suspicious
>    ND traffic in advance.  Based on the SEND [RFC3971] mechanism, the
>    authentication for routers (i.e., IP-RSUs) can be conducted by only
>    selecting an IP-RSU that has a certification path toward trusted
>    parties.  For authenticating other vehicles, the cryptographically
>    generated address (CGA) can be used to verify the true owner of a
>    received ND message, which requires to use the CGA ND option in the
>    ND protocols.  For a general protection of the ND mechanism, the RSA
>    Signature ND option can also be used to protect the integrity of the
>    messages by public key signatures.  For a more advanced
>    authentication mechanism, a distributed blockchain-based mechanism
>    [Vehicular-BlockChain] can be used.
>
> >>> solution space. Again, the draft should focus on problems and needs.
> The
> problem here is that SEND is complex, and not implemented in the major
> stack.
> It relies on PKI for trusting the router. The V2I need is a zerotrust mod=
el
> where one V, the other local Vs, and the I, can help each other
> anonymously and
> harmlessly. <snip>
>
> 8.  Informative References
>
> >>> no normative reference?
>
> >>> no normative reference?
>
> <snip>
>
> Voila!
>
> Keep safe;
>
> Pascal
>
>
>
> _______________________________________________
> its mailing list
> its@ietf.org
> https://www.ietf.org/mailman/listinfo/its
>
>

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<div dir=3D"ltr">Hi Pascal,<div>I sincerely appreciate your super-fast feed=
back.</div><div>I will address your comments and submit the revision today.=
</div><div><br></div><div>Thanks.</div><div><br></div><div>Best Regards,</d=
iv><div>Paul</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" cla=
ss=3D"gmail_attr">On Thu, Sep 2, 2021 at 3:49 PM Pascal Thubert (pthubert) =
&lt;<a href=3D"mailto:pthubert@cisco.com">pthubert@cisco.com</a>&gt; wrote:=
<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US" style=3D"overflow-wrap: break-word;">
<div class=3D"gmail-m_-642032740916495806WordSection1">
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Hello Paul<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">This is absolutely excellent. I=E2=80=99m very happy will all =
the changes and your attached pdf made my life as a reviewer a lot simpler.
<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">This is really a great way of progressing together. Many thank=
s for that!<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">I=E2=80=99m all good but for a little snippet in the new text =
which is actually incorrect, and denotes a usual misunderstanding of RPL th=
at your doc may help correct for the future:<u></u><u></u></span></font></p=
>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Although RPL can be used in IPv6-based veh=
icular networks, it is primarily designed for lossy<u></u><u></u></span></f=
ont></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">networks, which puts energy efficiency fir=
st. In addition, the topology it considers may not<u></u><u></u></span></fo=
nt></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">quickly scale up and down for IPv6-based v=
ehicular networks, since the mobility of vehicles is<u></u><u></u></span></=
font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">much more diverse with a high speed, so it=
 can frequently alter a tree-like topology formed by<u></u><u></u></span></=
font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">RPL, which may cause network fragmentation=
 and merging with more control traffic<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">The roots of my contribution to RPL are in=
 vehicular networks, exactly the use case you describe. Based on that exper=
ience (including some actual test with
 NASA) I=E2=80=99d change the text above with:<u></u><u></u></span></font><=
/p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">RPL is primarily designed to minimize the =
control plane activity, that is the relative amount of routing protocol exc=
hanges vs. data traffic; this approach
 is beneficial for situations where the power and bandwidth are scarce (e.g=
., an IoT LLN where RPL is typically used today), but also in situations of=
 high relative mobility between the nodes in the network (aka swarming, e.g=
., within a variable set of vehicles
 with a similar global motion, or a toon of drones).<u></u><u></u></span></=
font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">To reduce the routing exchanges, RPL lever=
ages a Distance Vector approach, which does not need a global knowledge of =
the topology,
 and only optimizes the routes to and from the root, allowing P2P paths to =
be stretched. Although RPL installs its routes proactively, it only maintai=
ns them lazily, in reaction to actual traffic, or as a slow background acti=
vity. Additionally, RPL leverages
 the concept of an objective function, which allows to adapt the activity o=
f the routing protocol to the use case, e.g., type, speed, and quality of t=
he radios. RPL does not need converge, and provides connectivity to most no=
des most of the time. The default
 route towards the Root is maintained aggressively and may change while a p=
acket progresses without causing loops, so the packet will still reach the =
root. In non-storing mode, a node inside the mesh/swarm that changes its po=
int(s) of attachment to the graph
 informs the root with a single unicast packet the flows along the default =
route, and the connectivity is restored immediately; this mode is preferabl=
e for use cases where internet connectivity is dominant. OTOH, in storing m=
ode, the routing stretch is reduced,
 for a better P2P connectivity, while the internet connectivity is restored=
 more slowly, time for the DV operation to operate hop-by-hop. While a RPL =
topology can quickly scale up and down and fits the needs of mobility of ve=
hicles, the total performance of
 the system will also depend on how quickly a node can form an address, joi=
n the mesh (including AAA), and manage its global mobility to become reacha=
ble from outside the mesh.<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Otherwise, all good!<u></u><u></u></span><=
/font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Take care,<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Pascal<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0cm 0cm 0cm 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><span style=3D"=
font-size:11pt;font-weight:bold">From:</span></font></b> Mr. Jaehoon Paul J=
eong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" target=3D"_blank">jaehoo=
n.paul@gmail.com</a>&gt;
<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> lundi 30 ao=C3=BBt 202=
1 15:12<br>
<b><span style=3D"font-weight:bold">To:</span></b> Pascal Thubert (pthubert=
) &lt;<a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisc=
o.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Cc:</span></b> <a href=3D"mailto:int-di=
r@ietf.org" target=3D"_blank">int-dir@ietf.org</a>; Last Call &lt;<a href=
=3D"mailto:last-call@ietf.org" target=3D"_blank">last-call@ietf.org</a>&gt;=
; <a href=3D"mailto:draft-ietf-ipwave-vehicular-networking.all@ietf.org" ta=
rget=3D"_blank">draft-ietf-ipwave-vehicular-networking.all@ietf.org</a>; <a=
 href=3D"mailto:its@ietf.org" target=3D"_blank">its@ietf.org</a>; Russ Hous=
ley &lt;<a href=3D"mailto:housley@vigilsec.com" target=3D"_blank">housley@v=
igilsec.com</a>&gt;; CARLOS JESUS BERNARDOS CANO &lt;<a href=3D"mailto:cjbc=
@it.uc3m.es" target=3D"_blank">cjbc@it.uc3m.es</a>&gt;; skku-iotlab-members
 &lt;<a href=3D"mailto:skku-iotlab-members@googlegroups.com" target=3D"_bla=
nk">skku-iotlab-members@googlegroups.com</a>&gt;; Chris Shen &lt;<a href=3D=
"mailto:shenyiwen7@gmail.com" target=3D"_blank">shenyiwen7@gmail.com</a>&gt=
;; Mr. Jaehoon Paul Jeong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" tar=
get=3D"_blank">jaehoon.paul@gmail.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Subject:</span></b> Re: [ipwave] Intdir=
 last call review of draft-ietf-ipwave-vehicular-networking-20<u></u><u></u=
></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Hi Pascal,<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Here is the revision (-21) of IPWAVE PS Draft:<u></u><u></u></=
span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-ip=
wave-vehicular-networking-21" target=3D"_blank">https://datatracker.ietf.or=
g/doc/html/draft-ietf-ipwave-vehicular-networking-21</a><u></u><u></u></spa=
n></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">I attach the revision letter to show how I have addressed your=
 comments on the revision.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Chris and I have worked for this revision together.<u></u><u><=
/u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">If you have further comments, please let me know.<u></u><u></u=
></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Thanks.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Best Regards,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Paul<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert via Datatracker=
 &lt;<a href=3D"mailto:noreply@ietf.org" target=3D"_blank">noreply@ietf.org=
</a>&gt; wrote:<u></u><u></u></span></font></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4=
.8pt;margin-right:0cm">
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Reviewer: Pascal Thubert<br>
Review result: Not Ready<br>
<br>
Dear authors<br>
<br>
In summary:<br>
<br>
I read a number of very good drafts collated in one, from the use cases tha=
t<br>
very complete and ready to publish, to the architecture and protocol soluti=
on<br>
in section 4 that would require more work for completeness.<br>
<br>
There are multiple instances in the use cases where protocols are listed co=
ming<br>
out of the blue, e.g., the references to OMNI that seem artificially spread=
<br>
regardless of the context of the section. OMNI is used throughout, both as =
an<br>
open ended toolbox, and as a carpet under which all problems can be hidden.=
<br>
<br>
Reading this doc, OMNI shows as an interface to a software mobile router, w=
ith<br>
multiple of the device physical interfaces connected to the mobile router. =
This<br>
makes the stack very simple as the complexity moves to the router. But now =
you<br>
have to implement the router. Presented as that, the OMNI router deserves i=
ts<br>
name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANET (=
many to<br>
choose from) and NEMO (and all the MIP protocol family across address<br>
families), all the possible radio interfaces on which the ND problems go aw=
ay<br>
by magic, and whatever else you want to put in there. Is that the intention=
?<br>
<br>
Instead of referring to OMNI for virtually anything, the doc should refer t=
o<br>
MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),<br>
draft-nordmark-intarea-ippl for split subnets, and<br>
draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet models.=
 And<br>
then you can say that all those components can be plugged in the OMNI route=
r,<br>
and you can discuss which MANET and which MIP you want, including using OMN=
I=E2=80=99s<br>
built in mobility.<br>
<br>
Note that my objections are not against the OMNI design, it might be the<br=
>
perfect thing and I am already aware of use cases that could be served by a=
<br>
P2MP interface like OMNI in conjunction with RFC8505 on the P2P subinterfac=
es<br>
(recycling the high level design we=E2=80=99ve been shipping for IPv4 / fra=
me relay for<br>
the last 30 years). My objection is of the way the draft uses [OMNI] as the=
<br>
magic wand that solves all the problems when what you really do is throw th=
em<br>
over the fence. I=E2=80=99d rather you focus on problems and use cases, for=
 which<br>
there=E2=80=99s excellent text, and indicate what needs to be done without =
making<br>
assumption on how the needful things will be solved.<br>
<br>
In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to spl=
it, keep all<br>
that=E2=80=99s use case and problem description and ship it, remove referen=
ces to<br>
protocols envisioned in the solution, and start the work on architecture of=
 the<br>
solution and the protocol applicability statements separately. An alternate=
<br>
would be to centralize the discussion on protocols to annex, and explain th=
at<br>
protocol A or B could be envisioned in solution space because to over this =
gap<br>
or implement that function.<br>
<br>
In any fashion, the current text is not ready for publication as applicabil=
ity<br>
statement, architecture and or/solution, so the related work should be remo=
ved<br>
from the main text. But I find it mostly ready for use case and problem<br>
statement, more below.<br>
<br>
Review:<br>
<br>
Abstract<br>
<br>
=C2=A0 =C2=A0This document discusses the problem statement and use cases of=
<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for Intelligent Transportation=
<br>
=C2=A0 =C2=A0Systems (ITS).<br>
<br>
&gt;&gt;&gt; The document goes beyond that; there was actually a thread at =
6MAN where<br>
Bob Hinden said =E2=80=9C This document says it is a problem statement, but=
 then<br>
becomes a solution document.=C2=A0 =C2=A0Might be better to cut it down to =
only the<br>
problem statement part. =E2=80=9C &gt;&gt;&gt; Would you consider doing thi=
s? If not, why? Note:<br>
you may want to respond on 6MAN as well. &gt;&gt;&gt; &gt;&gt;&gt;I would h=
ave thought that the<br>
traditional steps of problem statement and applicability statement of exist=
ing<br>
work could be expected from IPWAVE too. &gt;&gt;&gt; Please clarify the ste=
ps that you<br>
intend to follow next with this work.<br>
<br>
&lt;snip&gt;<br>
<br>
1.=C2=A0 Introduction<br>
<br>
&gt;&gt;&gt; Very readable and informative section, many thanks!<br>
<br>
=C2=A0 =C2=A0Along with these WAVE standards and C-V2X standards, regardles=
s of a<br>
=C2=A0 =C2=A0wireless access technology under the IP stack of a vehicle, ve=
hicular<br>
=C2=A0 =C2=A0networks can operate IP mobility with IPv6 [RFC8200] and Mobil=
e IPv6<br>
=C2=A0 =C2=A0protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (P=
MIPv6)<br>
=C2=A0 =C2=A0[RFC5213], Distributed Mobility Management (DMM) [RFC7333], Lo=
cator/<br>
=C2=A0 =C2=A0ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Ext=
ended<br>
=C2=A0 =C2=A0Route Optimization (AERO) [RFC6706BIS]).<br>
<br>
&gt;&gt;&gt; NEMO (RFC 3963) is not cited. Any reason why the vehicle would=
 not<br>
transport a network?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0This document describes use cases and a problem statement abou=
t<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for ITS, which is named IPv6 W=
ireless<br>
=C2=A0 =C2=A0Access in Vehicular Environments (IPWAVE).=C2=A0 First, it int=
roduces the<br>
=C2=A0 =C2=A0use cases for using V2V, V2I, and V2X networking in ITS.=C2=A0=
 Next, for<br>
=C2=A0 =C2=A0IPv6-based vehicular networks, it makes a gap analysis of curr=
ent<br>
=C2=A0 =C2=A0IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Manage=
ment,<br>
=C2=A0 =C2=A0and Security &amp; Privacy), and then enumerates requirements =
for the<br>
=C2=A0 =C2=A0extensions of those IPv6 protocols, which are tailored to IPv6=
-based<br>
=C2=A0 =C2=A0vehicular networking.=C2=A0 Thus, this document is intended to=
 motivate<br>
=C2=A0 =C2=A0development of key protocols for IPWAVE.<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
2.=C2=A0 Terminology<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0o=C2=A0 IP-OBU: &quot;Internet Protocol On-Board Unit&quot;: A=
n IP-OBU denotes a<br>
=C2=A0 =C2=A0 =C2=A0 computer situated in a vehicle (e.g., car, bicycle, au=
tobike,<br>
=C2=A0 =C2=A0 =C2=A0 motor cycle, and a similar one) and a device (e.g., sm=
artphone and<br>
=C2=A0 =C2=A0 =C2=A0 IoT device).=C2=A0 It has at least one IP interface th=
at runs in IEEE<br>
=C2=A0 =C2=A0 =C2=A0 802.11-OCB and has an &quot;OBU&quot; transceiver.=C2=
=A0 Also, it may have an IP<br>
=C2=A0 =C2=A0 =C2=A0 interface that runs in Cellular V2X (C-V2X) [TS-23.285=
-3GPP]<br>
=C2=A0 =C2=A0 =C2=A0 [TR-22.886-3GPP][TS-23.287-3GPP].=C2=A0 See the defini=
tion of the term<br>
=C2=A0 =C2=A0 =C2=A0 &quot;OBU&quot; in [RFC8691].<br>
<br>
&gt;&gt;&gt; Can that be a router connecting multiple computers?<br>
<br>
&lt;snip&gt;<br>
<br>
3.=C2=A0 Use Cases<br>
<br>
&gt;&gt;&gt; This is another great read and an enlightening section. Maybe =
mention in<br>
the abstract that the doc also covers use cases?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Although a Layer-2 solution can provide a support for multihop=
<br>
=C2=A0 =C2=A0communications in vehicular networks, the scalability issue re=
lated<br>
=C2=A0 =C2=A0to multihop forwarding still remains when vehicles need to<br>
=C2=A0 =C2=A0disseminate or forward packets toward multihop-away destinatio=
ns.=C2=A0 In<br>
=C2=A0 =C2=A0addition, the IPv6-based approach for V2V as a network layer p=
rotocol<br>
=C2=A0 =C2=A0can accommodate multiple radio technologies as MAC protocols, =
such as<br>
=C2=A0 =C2=A05G V2X and DSRC.=C2=A0 Therefore, the existing IPv6 protocol c=
an be<br>
=C2=A0 =C2=A0augmented through the addition of an Overlay Multilink Network=
 (OMNI)<br>
=C2=A0 =C2=A0Interface [OMNI] and/or protocol changes in order to support b=
oth<br>
=C2=A0 =C2=A0wireless single-hop/multihop V2V communications and multiple r=
adio<br>
=C2=A0 =C2=A0technologies in vehicular networks.=C2=A0 In such a way, vehic=
les can<br>
=C2=A0 =C2=A0communicate with each other by V2V communications to share eit=
her an<br>
=C2=A0 =C2=A0emergency situation or road hazard in a highway having multipl=
e kinds<br>
=C2=A0 =C2=A0of radio technologies, such as 5G V2X and DSRC.<br>
<br>
&gt;&gt;&gt; This text appears in the middle of high level use case, with a=
 crude list<br>
of protocols; this is not a place for it<br>
<br>
&gt;&gt;&gt; On a 6MAN Thread, Brian Carpenter said that the above:<br>
=E2=80=9C<br>
is of concern regardless of the mention of OMNI. Does it mean &quot;can be&=
quot; or<br>
&quot;needs to be&quot;? This paragraph seems like a very short summary of =
a big problem<br>
area. At the end of page 13 there is some related discussion, which mention=
s<br>
RPL as part of the solution (good choice, IMHO) but again seems to depend o=
n<br>
OMNI. I don&#39;t think the fix of simply removing references to OMNI works=
,<br>
because it would leave a gap. In an informational document, that is not a<b=
r>
formal problem but as far as this draft describes architecture, I don&#39;t=
 think<br>
that big a gap is reasonable. &quot;OMNI&quot; is mentioned more than 20 ti=
mes in the<br>
document. There are also several references to AERO, which is strongly<br>
associated with OMNI. =E2=80=9C &gt;&gt;&gt; I agree with Brian. Here the d=
ocument seems to be<br>
mixing solution with problem and putting the cart before the horse. My<br>
recommendation is to stick to what needs to be done that IPv6 does not do y=
et<br>
-the reqs and gaps-; but the doc should not step in the how things will be =
done<br>
unless the group already decided to do it. The logical next steps to a PS a=
re<br>
an applicability statement of existing work, and if the gaps cannot be fill=
ed,<br>
there may be one or more WG chartered to fill those gaps.<br>
<br>
&gt;&gt;&gt; I=E2=80=99d still be happy to see an annex with leads on where=
 the solution might<br>
come from like RFC 8691 does.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2I communications in a highway where RSUs a=
re<br>
=C2=A0 =C2=A0sparsely deployed, so a vehicle can reach the wireless coverag=
e of an<br>
=C2=A0 =C2=A0RSU through the multihop data forwarding of intermediate vehic=
les.<br>
=C2=A0 =C2=A0Thus, IPv6 needs to be extended for multihop V2I communication=
s.<br>
<br>
&gt;&gt;&gt; Note that I have no clue on how well OMNI applies in that spac=
e, maybe it<br>
does very well; but here it comes out of the blue with no justification. If=
 you<br>
mention OMNI you need to detail what it is and which of the V2V=C2=A0 probl=
ems you<br>
expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2X (or V2I2X) communications in an urban ro=
ad<br>
=C2=A0 =C2=A0network where RSUs are deployed at intersections, so a vehicle=
 (or a<br>
=C2=A0 =C2=A0pedestrian&#39;s smartphone) can reach the wireless coverage o=
f an RSU<br>
=C2=A0 =C2=A0through the multihop data forwarding of intermediate vehicles =
(or<br>
=C2=A0 =C2=A0pedestrians&#39; smartphones).=C2=A0 Thus, IPv6 needs to be ex=
tended for<br>
=C2=A0 =C2=A0multihop V2X (or V2I2X) communications.<br>
<br>
&gt;&gt;&gt; Please be more specific on what the missing functions are and =
whether they<br>
are missing from the stack development standpoint or if there=E2=80=99s wor=
k needed<br>
from the IETF. 1)=C2=A0 =C2=A0 =C2=A0 If something is really missing in our=
 specs, the text to<br>
prove from the use case above is missing 2)=C2=A0 =C2=A0 =C2=A0 how OMNI se=
rves the use case<br>
could be elaborated in an applicability statement of OMNI for V2xyz, but it=
 is<br>
a bit blunt to present it as panacea when the problems to be solved are not=
<br>
listed. 3)=C2=A0 =C2=A0 =C2=A0 If you look at it, OMNI seems like a softwar=
e mobile router<br>
within a bump in the stack. Can that become too big?<br>
<br>
&gt;&gt;&gt; my view is that the text above and the similar occasions shoul=
d be replaced<br>
by something like :<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented to provide the fo=
llowing<br>
=C2=A0 =C2=A0functions: 1) =E2=80=A6<br>
<br>
&gt;&gt;&gt; and / or something like:<br>
<br>
=C2=A0 =C2=A0In addition to the IPv6 node requirements [RFC 8504], the IPv6=
 protocol<br>
=C2=A0 =C2=A0stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=
=A6<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To support applications of these V2X use cases, the functions =
of IPv6<br>
=C2=A0 =C2=A0such as VND, VMM, and VSP are prerequisites for IPv6-based pac=
ket<br>
=C2=A0 =C2=A0exchange, transport-layer session continuity, and secure, safe=
<br>
=C2=A0 =C2=A0communication between a vehicle and a pedestrian either direct=
ly or<br>
=C2=A0 =C2=A0indirectly via an IP-RSU.<br>
<br>
&gt;&gt;&gt; =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=
=9D does not parse. There=E2=80=99s<br>
no IPv6 reference that provides those functions. If the intention is to say=
<br>
that there=E2=80=99s stuff to add to IPv6 to support, like, say,=C2=A0 VND,=
 then this<br>
document fails to define how an IPv6 VND should behave, though it=E2=80=99s=
 precisely<br>
what I=E2=80=99d expect from a problem statement.<br>
<br>
&lt;snip&gt;<br>
<br>
4.=C2=A0 Vehicular Networks<br>
<br>
&gt;&gt;&gt; What is the purpose of section 4 as a whole, problem statement=
 or<br>
applicability statement of the listed protocols? In the former case what=E2=
=80=99s the<br>
problem? In the latter case it is incomplete and needs to be exported to an=
<br>
applicability statement doc with all the possible technologies evaluated.<b=
r>
<br>
=C2=A0 =C2=A0This section describes an example vehicular network architectu=
re<br>
=C2=A0 =C2=A0supporting V2V, V2I, and V2X communications in vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt; I read this as presenting a context to explain what the proble=
ms are<br>
instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe usin=
g the term<br>
=E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=99s =
comment.<br>
<br>
&lt;snip&gt;<br>
<br>
4.1.=C2=A0 Vehicular Network Architecture<br>
<br>
=C2=A0 =C2=A0Figure 1 shows an example vehicular network architecture for V=
2I and<br>
=C2=A0 =C2=A0V2V in a road network [OMNI].<br>
<br>
a.=C2=A0 =C2=A0 =C2=A0 Is using OMNI a decision that the WG made for the fu=
ture work ? what<br>
does it do and what does it not do? b.=C2=A0 =C2=A0 =C2=A0 Is there work le=
ft to be done? Who<br>
will do that work? Or is it the expectation that OMNI has it all defined<br=
>
already?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An existing network architecture (e.g., an IP-based aeronautic=
al<br>
=C2=A0 =C2=A0network architecture [OMNI][UAM-ITS], a network architecture o=
f<br>
=C2=A0 =C2=A0PMIPv6 [RFC5213], and a low-power and lossy network architectu=
re<br>
=C2=A0 =C2=A0[RFC6550]) can be extended to a vehicular network architecture=
 for<br>
=C2=A0 =C2=A0multihop V2V, V2I, and V2X, as shown in Figure 1.=C2=A0 In a h=
ighway<br>
=C2=A0 =C2=A0scenario, a vehicle may not access an RSU directly because of =
the<br>
=C2=A0 =C2=A0distance of the DSRC coverage (up to 1 km).=C2=A0 For example,=
 the OMNI<br>
=C2=A0 =C2=A0interface and/or RPL (IPv6 Routing Protocol for Low-Power and =
Lossy<br>
=C2=A0 =C2=A0Networks) [RFC6550] can be extended to support a multihop V2I =
since a<br>
=C2=A0 =C2=A0vehicle can take advantage of other vehicles as relay nodes to=
 reach<br>
=C2=A0 =C2=A0the RSU.=C2=A0 Also, RPL can be extended to support both multi=
hop V2V and<br>
=C2=A0 =C2=A0V2X in the similar way.<br>
<br>
&gt;&gt;&gt; all this could fit well in annex; anyway you need to explain w=
hat you<br>
expect the protocols to do and which extension is needed. In the case of RP=
L at<br>
least you indicate that it would do routing, but not why you cannot use it =
of<br>
the shelf; for OMNI, what you expect is less clear, though there=E2=80=99s =
text<br>
elsewhere about the many radio interfaces that could be used for the purpos=
e,<br>
and the text in the UAM below that is enlightening.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 To support not only the mobil=
ity<br>
=C2=A0 =C2=A0management of the UAM end systems, but also the multihop and<b=
r>
=C2=A0 =C2=A0multilink communications of the UAM interfaces, the UAM end sy=
stems<br>
=C2=A0 =C2=A0can employ an Overlay Multilink Network (OMNI) interface [OMNI=
] as a<br>
=C2=A0 =C2=A0virtual Non-Broadcast Multiple Access (NBMA) connection to a s=
erving<br>
=C2=A0 =C2=A0ground domain infrastructure.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; when connecting to a MANET it needs support for that MANET. The t=
ext<br>
above seems to imply that is solves everything in V2xyz like magic; reminds=
 me<br>
of the IPv6 multicast abstraction that was supposed to solve the broadcast<=
br>
problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 This infrastructure can be configured<br>
=C2=A0 =C2=A0over the underlying data links.=C2=A0 The OMNI interface and i=
ts link<br>
=C2=A0 =C2=A0model provide a means of multilink, multihop and mobility<br>
=C2=A0 =C2=A0coordination to the legacy IPv6 ND messaging [RFC4861] accordi=
ng to<br>
=C2=A0 =C2=A0the NBMA principle.=C2=A0 Thus, the OMNI link model can suppor=
t efficient<br>
=C2=A0 =C2=A0UAM internetworking services without additional mobility messa=
ging,<br>
=C2=A0 =C2=A0and without any modification to the IPv6 ND messaging services=
 or<br>
=C2=A0 =C2=A0link model.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; the text above seems to imply that is solves everything in V2xyz =
like<br>
magic; that would be a stretch, that reminds me of IPv6 multicast that was<=
br>
supposed to solve the broadcast problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Multiple vehicles under the coverage of an RSU share a prefix =
just as<br>
=C2=A0 =C2=A0mobile nodes share a prefix of a Wi-Fi access point in a wirel=
ess<br>
=C2=A0 =C2=A0LAN.=C2=A0 This is a natural characteristic in infrastructure-=
based<br>
=C2=A0 =C2=A0wireless networks.=C2=A0 For example, in Figure 1, two vehicle=
s (i.e.,<br>
=C2=A0 =C2=A0Vehicle2, and Vehicle5) can use Prefix 1 to configure their IP=
v6<br>
=C2=A0 =C2=A0global addresses for V2I communication.=C2=A0 Alternatively, m=
obile nodes<br>
=C2=A0 =C2=A0can employ an OMNI interface and use their own IPv6 Unique Loc=
al<br>
=C2=A0 =C2=A0Addresses (ULAs) [RFC4193] over the wireless network without<b=
r>
=C2=A0 =C2=A0requiring the messaging of IPv6 Stateless Address Autoconfigur=
ation<br>
=C2=A0 (SLAAC) [RFC4862], which uses an on-link prefix provided by the<br>
=C2=A0 =C2=A0(visited) wireless LAN; this technique is known as &quot;Bring=
-Your-Own-<br>
=C2=A0 =C2=A0Addresses&quot;.<br>
<br>
&gt;&gt;&gt;=C2=A0 Is OMNI the only way to &quot;Bring-Your-Own-Addresses=
=E2=80=9D? Else the text could be<br>
more generic, at least use e.g., like the ref to AERO later. &gt;&gt;&gt; W=
hat are the<br>
implications / limitations of doing that =E2=80=93 like they can do line of=
 sight V2V<br>
but not reach the internet, or the need of=C2=A0 a local MANET / RPL that w=
ill<br>
accept to route those addresses, or the security / address ownership valida=
tion<br>
issues ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0A single subnet prefix announced by an RSU can span multiple v=
ehicles<br>
=C2=A0 =C2=A0in VANET.=C2=A0 For example, in Figure 1, for Prefix 1, three =
vehicles<br>
=C2=A0 =C2=A0(i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a conne=
cted<br>
=C2=A0 =C2=A0VANET.=C2=A0 Also, for Prefix 2, two vehicles (i.e., Vehicle3 =
and<br>
=C2=A0 =C2=A0Vehicle6) can construct another connected VANET, and for Prefi=
x 3,<br>
=C2=A0 =C2=A0two vehicles (i.e., Vehicle4 and Vehicle7) can construct anoth=
er<br>
=C2=A0 =C2=A0connected VANET.=C2=A0 Alternatively, each vehicle could emplo=
y an OMNI<br>
=C2=A0 =C2=A0interface with their own ULAs such that no topologically-orien=
ted<br>
=C2=A0 =C2=A0subnet prefixes need be announced by the RSU.<br>
<br>
&gt;&gt;&gt;=C2=A0 same as above. This seems to restate the same thing, der=
ive an address<br>
from a topologically correct prefix or use your own with limitations to be<=
br>
described.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]<b=
r>
=C2=A0 =C2=A0specifies several details, including Maximum Transmission Unit=
 (MTU),<br>
=C2=A0 =C2=A0frame format, link-local address, address mapping for unicast =
and<br>
=C2=A0 =C2=A0multicast, stateless autoconfiguration, and subnet structure.=
=C2=A0 An<br>
=C2=A0 =C2=A0Ethernet Adaptation (EA) layer is in charge of transforming so=
me<br>
=C2=A0 =C2=A0parameters between the IEEE 802.11 MAC layer and the IPv6 netw=
ork<br>
=C2=A0 =C2=A0layer, which is located between the IEEE 802.11-OCB&#39;s logi=
cal link<br>
=C2=A0 =C2=A0control layer and the IPv6 network layer.=C2=A0 This IPv6 over=
 802.11-OCB<br>
=C2=A0 =C2=A0can be used for both V2V and V2I in IPv6-based vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt;=C2=A0 solution space.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An IPv6 mobility solution is needed for the guarantee of<br>
=C2=A0 =C2=A0communication continuity in vehicular networks so that a vehic=
le&#39;s<br>
=C2=A0 =C2=A0TCP session can be continued, or UDP packets can be delivered =
to a<br>
=C2=A0 =C2=A0vehicle as a destination without loss while it moves from an I=
P-RSU&#39;s<br>
=C2=A0 =C2=A0wireless coverage to another IP-RSU&#39;s wireless coverage.=
=C2=A0 In<br>
=C2=A0 =C2=A0Figure 1, assuming that Vehicle2 has a TCP session (or a UDP s=
ession)<br>
=C2=A0 =C2=A0with a corresponding node in the vehicular cloud, Vehicle2 can=
 move<br>
=C2=A0 =C2=A0from IP-RSU1&#39;s wireless coverage to IP-RSU2&#39;s wireless=
 coverage.=C2=A0 In<br>
=C2=A0 =C2=A0this case, a handover for Vehicle2 needs to be performed by ei=
ther a<br>
=C2=A0 =C2=A0host-based mobility management scheme (e.g., MIPv6 [RFC6275]) =
or a<br>
=C2=A0 =C2=A0network-based mobility management scheme (e.g., PMIPv6 [RFC521=
3] and<br>
=C2=A0 =C2=A0AERO [RFC6706BIS]).<br>
<br>
=C2=A0 =C2=A0In the host-based mobility scheme (e.g., MIPv6), an IP-RSU pla=
ys a<br>
=C2=A0 =C2=A0role of a home agent.=C2=A0 On the other hand, in the network-=
based<br>
=C2=A0 =C2=A0mobility scheme (e.g., PMIPv6, an MA plays a role of a mobilit=
y<br>
=C2=A0 =C2=A0management controller such as a Local Mobility Anchor (LMA) in=
<br>
=C2=A0 =C2=A0PMIPv6, which also serves vehicles as a home agent, and an IP-=
RSU<br>
=C2=A0 =C2=A0plays a role of an access router such as a Mobile Access Gatew=
ay<br>
=C2=A0 =C2=A0(MAG) in PMIPv6 [RFC5213].=C2=A0 The host-based mobility schem=
e needs<br>
=C2=A0 =C2=A0client functionality in IPv6 stack of a vehicle as a mobile no=
de for<br>
=C2=A0 =C2=A0mobility signaling message exchange between the vehicle and ho=
me<br>
=C2=A0 =C2=A0agent.=C2=A0 On the other hand, the network-based mobility sch=
eme does not<br>
=C2=A0 =C2=A0need such a client functionality for a vehicle because the net=
work<br>
=C2=A0 =C2=A0infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility =
agent<br>
=C2=A0 =C2=A0handles the mobility signaling message exchange with the home =
agent<br>
=C2=A0 =C2=A0(e.g., LMA in PMIPv6) for the sake of the vehicle.<br>
<br>
=C2=A0 =C2=A0There are a scalability issue and a route optimization issue i=
n the<br>
=C2=A0 =C2=A0network-based mobility scheme (e.g., PMIPv6) when an MA covers=
 a<br>
=C2=A0 =C2=A0large vehicular network governing many IP-RSUs.=C2=A0 In this =
case, a<br>
=C2=A0 =C2=A0distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate=
 the<br>
=C2=A0 =C2=A0scalability issue by distributing multiple MAs in the vehicula=
r<br>
=C2=A0 =C2=A0network such that they are positioned closer to vehicles for r=
oute<br>
=C2=A0 =C2=A0optimization and bottleneck mitigation in a central MA in the<=
br>
=C2=A0 =C2=A0network-based mobility scheme.=C2=A0 All these mobility approa=
ches (i.e.,<br>
=C2=A0 =C2=A0a host-based mobility scheme, network-based mobility scheme, a=
nd<br>
=C2=A0 =C2=A0distributed mobility scheme) and a hybrid approach of a combin=
ation<br>
=C2=A0 =C2=A0of them need to provide an efficient mobility service to vehic=
les<br>
=C2=A0 =C2=A0moving fast and moving along with the relatively predictable<b=
r>
=C2=A0 =C2=A0trajectories along the roadways.<br>
<br>
=C2=A0 =C2=A0In vehicular networks, the control plane can be separated from=
 the<br>
=C2=A0 =C2=A0data plane for efficient mobility management and data forwardi=
ng by<br>
=C2=A0 =C2=A0using the concept of Software-Defined Networking (SDN)<br>
=C2=A0 =C2=A0[RFC7149][DMM-FPC].=C2=A0 Note that Forwarding Policy Configur=
ation (FPC)<br>
=C2=A0 =C2=A0in [DMM-FPC], which is a flexible mobility management system, =
can<br>
=C2=A0 =C2=A0manage the separation of data-plane and control-plane in DMM.=
=C2=A0 In<br>
=C2=A0 =C2=A0SDN, the control plane and data plane are separated for the ef=
ficient<br>
=C2=A0 =C2=A0management of forwarding elements (e.g., switches and routers)=
 where<br>
=C2=A0 =C2=A0an SDN controller configures the forwarding elements in a cent=
ralized<br>
=C2=A0 =C2=A0way and they perform packet forwarding according to their forw=
arding<br>
=C2=A0 =C2=A0tables that are configured by the SDN controller.=C2=A0 An MA =
as an SDN<br>
=C2=A0 =C2=A0controller needs to efficiently configure and monitor its IP-R=
SUs and<br>
=C2=A0 =C2=A0vehicles for mobility management, location management, and sec=
urity<br>
=C2=A0 =C2=A0services.<br>
<br>
=C2=A0 =C2=A0The mobility information of a GPS receiver mounted in its vehi=
cle<br>
=C2=A0 =C2=A0(e.g., position, speed, and direction) can be used to accommod=
ate<br>
=C2=A0 =C2=A0mobility-aware proactive handover schemes, which can perform t=
he<br>
=C2=A0 =C2=A0handover of a vehicle according to its mobility and the wirele=
ss<br>
=C2=A0 =C2=A0signal strength of a vehicle and an IP-RSU in a proactive way.=
<br>
<br>
=C2=A0 =C2=A0Vehicles can use the TCC as their Home Network having a home a=
gent<br>
=C2=A0 =C2=A0for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5=
213],<br>
=C2=A0 =C2=A0so the TCC (or an MA inside the TCC) maintains the mobility<br=
>
=C2=A0 =C2=A0information of vehicles for location management.=C2=A0 IP tunn=
eling over<br>
=C2=A0 =C2=A0the wireless link should be avoided for performance efficiency=
.<br>
=C2=A0 =C2=A0Also, in vehicular networks, asymmetric links sometimes exist =
and<br>
=C2=A0 =C2=A0must be considered for wireless communications such as V2V and=
 V2I.<br>
<br>
&gt;&gt;&gt;=C2=A0 This is all very informative text but does not state a p=
roblem. Is there a<br>
problem is left to be solved or are we assessing the applicability of<br>
protocols? Could it for instance, forward point to issues discussed in sect=
ion<br>
5?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, as internal networks, a vehicle&#39;s mo=
ving<br>
=C2=A0 =C2=A0network and an EN&#39;s fixed network are self-contained netwo=
rks having<br>
=C2=A0 =C2=A0multiple subnets and having an edge router (e.g., IP-OBU and I=
P-RSU)<br>
=C2=A0 =C2=A0for the communication with another vehicle or another EN.=C2=
=A0 The<br>
=C2=A0 =C2=A0internetworking between two internal networks via V2I communic=
ation<br>
=C2=A0 =C2=A0requires the exchange of the network parameters and the networ=
k<br>
=C2=A0 =C2=A0prefixes of the internal networks.=C2=A0 For the efficiency, t=
he network<br>
=C2=A0 =C2=A0prefixes of the internal networks (as a moving network) in a v=
ehicle<br>
=C2=A0 =C2=A0need to be delegated and configured automatically.=C2=A0 Note =
that a<br>
=C2=A0 =C2=A0moving network&#39;s network prefix can be called a Mobile Net=
work Prefix<br>
=C2=A0 =C2=A0(MNP) [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. MNP is originally =
defined here<br>
<a href=3D"https://datatracker.ietf.org/doc/html/rfc3963#section-2" target=
=3D"_blank">https://datatracker.ietf.org/doc/html/rfc3963#section-2</a> and=
 that=E2=80=99s a reference<br>
you can use normatively.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, the addresses used for IPv6 transmission=
s over<br>
=C2=A0 =C2=A0the wireless link interfaces for IP-OBU and IP-RSU can be eith=
er<br>
=C2=A0 =C2=A0global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets ca=
n be<br>
=C2=A0 =C2=A0routed within vehicular networks [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. There needs to=C2=
=A0 be a routing protocol<br>
like a MANET that will accept to carry the<br>
=C2=A0MNPs, and that must be implemented by the infra and both cars. The OM=
NI spec<br>
=C2=A0is clear on that. This is why at first glance I see OMNI as a full mo=
bile<br>
=C2=A0router in a bump in the stack. Now what is the problem behind this? N=
o such<br>
=C2=A0protocol at IETF? Too many to choose from? No deployment?<br>
&lt;snip&gt;<br>
<br>
When global IPv6 addresses<br>
=C2=A0 =C2=A0are used, wireless interface configuration and control overhea=
d for<br>
=C2=A0 =C2=A0Duplicate Address Detection (DAD) [RFC4862] and Multicast List=
ener<br>
=C2=A0 =C2=A0Discovery (MLD) [RFC2710][RFC3810] should be minimized to supp=
ort V2I<br>
=C2=A0 =C2=A0and V2X communications for vehicles moving fast along roadways=
; when<br>
=C2=A0 =C2=A0ULAs and the OMNI interface are used, no DAD nor MLD messaging=
 is<br>
=C2=A0 =C2=A0needed.<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it t=
he no dad needed a property<br>
of injecting a BYOA in the fabric for an GUA MIP Home Address which is know=
n to<br>
be unique at home? &gt;&gt;&gt; OTOH, autoconf=E2=80=99ing a random ULA =E2=
=80=9CFD=E2=80=A6=E2=80=9Dprefix has lesser<br>
DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classical =
subnet. So<br>
who says DAD isn=E2=80=99t required for OMNI ULA? &gt;&gt;&gt; note that IM=
HO DAD on wireless is<br>
a lot more harm than good, and I agree that with a good pseudo random gener=
ator<br>
the ULA has no chance to collision in the real world, as OMNI claims. It=E2=
=80=99s just<br>
that your argument here plays the other way, because there are less random =
bits<br>
(56)=C2=A0 in the ULA prefix than in the IID (62), and if one starts using =
more<br>
prefix bits to be non-random, there will be a time when DAD on prefix is ne=
eded.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Let us consider the upload/download time of a vehicle when it =
passes<br>
=C2=A0 =C2=A0through the wireless communication coverage of an IP-RSU.=C2=
=A0 For a<br>
=C2=A0 =C2=A0given typical setting where 1km is the maximum DSRC communicat=
ion<br>
=C2=A0 =C2=A0range [DSRC] and 100km/h is the speed limit in highway, the dw=
elling<br>
=C2=A0 =C2=A0time can be calculated to be 72 seconds by dividing the diamet=
er of<br>
=C2=A0 =C2=A0the 2km (i.e., two times of DSRC communication range where an =
IP-RSU<br>
=C2=A0 =C2=A0is located in the center of the circle of wireless communicati=
on) by<br>
=C2=A0 =C2=A0the speed limit of 100km/h (i.e., about 28m/s).=C2=A0 For the =
72 seconds,<br>
=C2=A0 =C2=A0a vehicle passing through the coverage of an IP-RSU can upload=
 and<br>
=C2=A0 =C2=A0download data packets to/from the IP-RSU.<br>
<br>
&lt;snip&gt;<br>
<br>
4.3.=C2=A0 V2V-based Internetworking<br>
<br>
&gt;&gt;&gt; In this section it looks like the cars are in a stable line of=
 sight<br>
relationship. Which is probably fine for a platoon, but when you drive alon=
g<br>
with friends in different cars, you realize that the line of sight assumpti=
on<br>
does not stand over time. Soon enough, other cars meddle in, and possibly o=
ne<br>
of the cars drives faster and too far ahead so you need the infra to relay,=
<br>
possibly over multiple infra hops.<br>
<br>
&gt;&gt;&gt; so in this section, I=E2=80=99d expect to see a Vehicle commun=
icating with another<br>
one and using either line of sight or V2V relaying but also using relay via=
 V2I<br>
(multihop I2I not just hub and spoke V2I2V ), alternatively to together for=
<br>
redundancy. Is that part of the problem?<br>
<br>
&gt;&gt;&gt; reading deeper section 5 I found excellent text on routing via=
 V and via I.<br>
This tells that section 4 does not play a good role at justifying section 5=
.<br>
Maybe keep section 4 for another doc?<br>
<br>
&gt;&gt;&gt; What kind or reliability is required in a V2V use case? Do you=
 think ND can<br>
handle it? Or MANET? What would be the assumption on L2 (roaming time, unic=
ast<br>
vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3 <br=
>
redundancy?<br>
<br>
&lt;snip&gt;<br>
<br>
5.=C2=A0 Problem Statement<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0In order to specify protocols using the architecture mentioned=
 in<br>
=C2=A0 =C2=A0Section 4.1, IPv6 core protocols have to be adapted to overcom=
e<br>
=C2=A0 =C2=A0certain challenging aspects of vehicular networking.=C2=A0 Sin=
ce the<br>
=C2=A0 =C2=A0vehicles are likely to be moving at great speed, protocol exch=
anges<br>
=C2=A0 =C2=A0need to be completed in a time relatively short compared to th=
e<br>
=C2=A0 =C2=A0lifetime of a link between a vehicle and an IP-RSU, or between=
 two<br>
=C2=A0 =C2=A0vehicles.<br>
<br>
&gt;&gt;&gt; Any order of magnitude?<br>
&gt;&gt;&gt; Can you indicate whether this already rules out certain proced=
ures, e.g.<br>
DAD ?<br>
<br>
=C2=A0 =C2=A0The lifetime of a session varies depending on the session&#39;=
s type such<br>
=C2=A0 =C2=A0as a web surfing, voice call over IP, and DNS query.=C2=A0 Reg=
ardless of a<br>
=C2=A0 =C2=A0session&#39;s type, to guide all the IPv6 packets to their des=
tination<br>
=C2=A0 =C2=A0host, IP mobility should be supported for the session.<br>
<br>
&gt;&gt;&gt; this seems to be for unicast when you know who to talk to. Is =
there a need<br>
some multicast groups like anybody around interested in topic blah like I c=
ould<br>
be multicasting the speed of vehicles coming the other way that I crossed<b=
r>
recently, for use of vehicles that I=E2=80=99m crossing now, so they can se=
e a slowdown<br>
on advance<br>
<br>
=C2=A0 =C2=A0Thus, the time constraint of a wireless link has a major impac=
t on<br>
=C2=A0 =C2=A0IPv6 Neighbor Discovery (ND).=C2=A0 Mobility Management (MM) i=
s also<br>
=C2=A0 =C2=A0vulnerable to disconnections that occur before the completion =
of<br>
=C2=A0 =C2=A0identity verification and tunnel management.=C2=A0 This is esp=
ecially true<br>
=C2=A0 =C2=A0given the unreliable nature of wireless communication.=C2=A0 T=
his section<br>
=C2=A0 =C2=A0presents key topics such as neighbor discovery and mobility<br=
>
=C2=A0 =C2=A0management.<br>
<br>
&gt;&gt;&gt; Only ND? What about the MANET?<br>
&gt;&gt;&gt; how fast should ND be to be suitable?<br>
&gt;&gt;&gt; is there also a bandwidth check? You can make things much fast=
er if you<br>
dedicate a lot of spectrum to it. But that can also be a waste.<br>
<br>
5.1.=C2=A0 Neighbor Discovery<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The requirements for IPv6 ND for vehicular networks are effici=
ent DAD<br>
=C2=A0 =C2=A0and NUD operations.<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 This merging and partitioning should be considered for=
 the<br>
=C2=A0 =C2=A0IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAA=
C)<br>
=C2=A0 =C2=A0[RFC4862].<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Also, the partitioning of a VANET may make vehicles with the s=
ame<br>
=C2=A0 =C2=A0prefix be physically unreachable.=C2=A0 Also, SLAAC needs to p=
revent IPv6<br>
=C2=A0 =C2=A0address duplication due to the merging of VANETs.=C2=A0 Accord=
ing to the<br>
=C2=A0 =C2=A0merging and partitioning, a destination vehicle (as an IPv6 ho=
st)<br>
=C2=A0 =C2=A0needs to be distinguished as either an on-link host or an off-=
link<br>
=C2=A0 =C2=A0host even though the source vehicle uses the same prefix as th=
e<br>
=C2=A0 =C2=A0destination vehicle.<br>
<br>
&gt;&gt;&gt; should reference to draft-nordmark-intarea-ippl<br>
<br>
=C2=A0 =C2=A0To efficiently prevent IPv6 address duplication due to the VAN=
ET<br>
=C2=A0 =C2=A0partitioning and merging from happening in vehicular networks,=
 the<br>
=C2=A0 =C2=A0vehicular networks need to support a vehicular-network-wide DA=
D by<br>
=C2=A0 =C2=A0defining a scope that is compatible with the legacy DAD.=C2=A0=
 In this<br>
=C2=A0 =C2=A0case, two vehicles can communicate with each other when there =
exists<br>
=C2=A0 =C2=A0a communication path over VANET or a combination of VANETs and=
 IP-<br>
=C2=A0 =C2=A0RSUs, as shown in Figure 1.=C2=A0 By using the vehicular-netwo=
rk-wide DAD,<br>
=C2=A0 =C2=A0vehicles can assure that their IPv6 addresses are unique in th=
e<br>
=C2=A0 =C2=A0vehicular network whenever they are connected to the vehicular=
<br>
=C2=A0 =C2=A0infrastructure or become disconnected from it in the form of V=
ANET.<br>
<br>
&gt;&gt;&gt; Excellent<br>
<br>
=C2=A0 =C2=A0ND time-related parameters such as router lifetime and Neighbo=
r<br>
=C2=A0 =C2=A0Advertisement (NA) interval need to be adjusted for vehicle sp=
eed and<br>
=C2=A0 =C2=A0vehicle density.=C2=A0 For example, the NA interval needs to b=
e<br>
=C2=A0 =C2=A0dynamically adjusted according to a vehicle&#39;s speed so tha=
t the<br>
=C2=A0 =C2=A0vehicle can maintain its neighboring vehicles in a stable way,=
<br>
=C2=A0 =C2=A0considering the collision probability with the NA messages sen=
t by<br>
=C2=A0 =C2=A0other vehicles.<br>
<br>
&gt;&gt;&gt; Is that a problem or just an operational setting that needs to=
 be found?<br>
&gt;&gt;&gt; Do we need to reconsider the concepts of those timers?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, IPv6 ND should have =
minimum<br>
=C2=A0 =C2=A0changes for the interoperability with the legacy IPv6 ND used =
in the<br>
=C2=A0 =C2=A0Internet, including the DAD and NUD operations.<br>
<br>
&gt;&gt;&gt; I do not find the logical link with the text before, why is th=
is a =E2=80=9Cthus=E2=80=9D?<br>
&gt;&gt;&gt; why should the ND inside the VANET be constrained to be intero=
perable? This<br>
may place constraints on the solution.<br>
<br>
5.1.1.=C2=A0 Link Model<br>
<br>
=C2=A0 =C2=A0A prefix model for a vehicular network needs to facilitate the=
<br>
<br>
&gt;&gt;&gt; Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=
=80=9Cprefix model=E2=80=9D.<br>
&gt;&gt;&gt; it would make this piece and the next should refer to<br>
draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both li=
nk<br>
and subnet issues. The general ideas are the same, but the gory details her=
e<br>
are slightly incorrect, like this notion of prefix model than comes out of =
the<br>
blue. The model is really the subnet model for the subnet associated to P2M=
P.<br>
<br>
=C2=A0 =C2=A0communication between two vehicles with the same prefix regard=
less of<br>
=C2=A0 =C2=A0the vehicular network topology as long as there exist bidirect=
ional<br>
=C2=A0 =C2=A0E2E paths between them in the vehicular network including VANE=
Ts and<br>
=C2=A0 =C2=A0IP-RSUs.=C2=A0 This prefix model allows vehicles with the same=
 prefix to<br>
=C2=A0 =C2=A0communicate with each other via a combination of multihop V2V =
and<br>
=C2=A0 =C2=A0multihop V2I with VANETs and IP-RSUs.=C2=A0 Note that the OMNI=
 interface<br>
=C2=A0 =C2=A0supports an NBMA link model where multihop V2V and V2I communi=
cations<br>
=C2=A0 =C2=A0use each mobile node&#39;s ULAs without need for any DAD or ML=
D<br>
=C2=A0 =C2=A0messaging.<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; I kinda agree about the OMNI interface model, nothing against =
that. But you<br>
must see that there needs a lot more than what the OMNI interface to get<br=
>
packets across V and I hops to the destination. Like routing ala MANET,<br>
redundancy handling ala DetNet because it will be very lossy, path manageme=
nt<br>
ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND so i=
t does not<br>
solve the ND problems above.<br>
<br>
=C2=A0 =C2=A0IPv6 protocols work under certain assumptions that do not nece=
ssarily<br>
=C2=A0 =C2=A0hold for vehicular wireless access link types other than OMNI/=
NBMA<br>
=C2=A0 =C2=A0[VIP-WAVE][RFC5889]; the rest of this section discusses implic=
ations<br>
=C2=A0 =C2=A0for those link types that do not apply when the OMNI/NBMA link=
 model<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; The keyword here is P2MP / NBMA, and OMNI is one interface tha=
t accepts<br>
that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already P2M=
P / NBMA,<br>
using routing to complete the partial mesh in P2MP. The text seems to imply=
<br>
that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI is=
 loaded with<br>
other stuff than a plain P2MP capable interface. And ND over P2MP is not do=
ne<br>
by OMNI, OMNI only makes classical ND worse and only works in a full mesh. =
OTOH<br>
RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work very =
well<br>
within an OMNI interface and solve those problems. &gt;&gt;&gt; My point is=
 that you<br>
need to tell the full story or refrain from entering solution space in this=
 doc<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0There is a relationship between a link and a prefix, besides t=
he<br>
=C2=A0 =C2=A0different scopes that are expected from the link-local and glo=
bal<br>
=C2=A0 =C2=A0types of IPv6 addresses.=C2=A0 In an IPv6 link, it is assumed =
that all<br>
=C2=A0 =C2=A0interfaces which are configured with the same subnet prefix an=
d with<br>
=C2=A0 =C2=A0on-link bit set can communicate with each other on an IPv6 lin=
k.<br>
<br>
&gt;&gt;&gt; not assumed; that=E2=80=99s what the onlink but set tells. The=
 conclusion should be<br>
that the VANET cannot set the O bit.<br>
<br>
=C2=A0 =C2=A0However, the vehicular link model needs to define the relation=
ship<br>
=C2=A0 =C2=A0between a link and a prefix, considering the dynamics of wirel=
ess<br>
=C2=A0 =C2=A0links and the characteristics of VANET.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0From the previous observation, a vehicular link model should c=
onsider<br>
=C2=A0 =C2=A0the frequent partitioning and merging of VANETs due to vehicle=
<br>
=C2=A0 =C2=A0mobility.=C2=A0 Therefore, the vehicular link model needs to u=
se an on-<br>
=C2=A0 =C2=A0link prefix and off-link prefix according to the network topol=
ogy of<br>
=C2=A0 =C2=A0vehicles such as a one-hop reachable network and a multihop re=
achable<br>
<br>
&gt;&gt;&gt; No, the once a node saw a O bit set that sticks even if it see=
s other<br>
advertisements of the PIO with the O bit not set. &gt;&gt;&gt; This is a gl=
obal and<br>
intrinsic property of the prefix (and an attack vector that could be mentio=
ned<br>
in the sec section). &gt;&gt;&gt; the VANET prefix must never come with the=
 O bit set.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0network (or partitioned networks).=C2=A0 If the vehicles with =
the same<br>
=C2=A0 =C2=A0prefix are reachable from each other in one hop, the prefix sh=
ould be<br>
=C2=A0 =C2=A0on-link.<br>
<br>
&gt;&gt;&gt;&gt; No, see above; but the router may redirect though it is re=
ally risky<br>
unless this is a stable situation like a parking place.<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, the vehicular link m=
odel<br>
=C2=A0 =C2=A0should have minimum changes for interoperability with standard=
 IPv6<br>
=C2=A0 =C2=A0links in an efficient fashion to support IPv6 DAD, MLD and NUD=
<br>
=C2=A0 =C2=A0operations.=C2=A0 When the OMNI NBMA link model is used, there=
 are no link<br>
=C2=A0 =C2=A0model changes nor DAD/MLD messaging required.<br>
<br>
&gt;&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt;&gt; You need a good P2MP subnet model with routing support whe=
n the mesh is<br>
partial. My company alone has been shipping million of nodes that build sub=
nets<br>
of thousands, and that was done using IETF standards.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For vehicular networks with high mobility and density, the DAD=
 needs<br>
=C2=A0 =C2=A0to be performed efficiently with minimum overhead so that the<=
br>
=C2=A0 =C2=A0vehicles can exchange a driving safety message (e.g., collisio=
n<br>
=C2=A0 =C2=A0avoidance and accident notification) with each other with a sh=
ort<br>
=C2=A0 =C2=A0interval (e.g., 0.5 second) by a technical report from NHTSA<b=
r>
=C2=A0 =C2=A0(National Highway Traffic Safety Administration) [NHTSA-ACAS-R=
eport].<br>
=C2=A0 =C2=A0Such a driving safety message may include a vehicle&#39;s mobi=
lity<br>
=C2=A0 =C2=A0information (i.e., position, speed, direction, and acceleratio=
n/<br>
=C2=A0 =C2=A0deceleration).=C2=A0 The exchange interval of this message is =
0.5 second,<br>
=C2=A0 =C2=A0which is required to allow a driver to avoid a rear-end crash =
from<br>
=C2=A0 =C2=A0another vehicle.<br>
<br>
&gt;&gt;&gt; IPv6 over broadcast MAC (used to be called internet 0, 10+ yea=
rs ago)<br>
solves that MAC issue since there is no MAC.<br>
<br>
5.1.3.=C2=A0 Routing<br>
<br>
=C2=A0 =C2=A0For multihop V2V communications in either a VANET or VANETs vi=
a IP-<br>
=C2=A0 =C2=A0RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing proto=
col may<br>
=C2=A0 =C2=A0be required to support both unicast and multicast in the links=
 of the<br>
=C2=A0 =C2=A0subnet with the same IPv6 prefix.=C2=A0 However, it will be co=
stly to run<br>
=C2=A0 =C2=A0both vehicular ND and a vehicular ad hoc routing protocol in t=
erms of<br>
=C2=A0 =C2=A0control traffic overhead [ID-Multicast-Problems].<br>
<br>
&gt;&gt;&gt; we do that with IETF standards on battery operated devices alr=
eady. Using<br>
RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve see=
n 30 hops in<br>
meshes of thousands in the real world though it=E2=80=99s not the normal op=
erational<br>
model, but can happen to maintain connectivity during the reboot of a root)=
 and<br>
does not use broadcast. RPL was initially designed as a V2V2V protocol but<=
br>
found its market on the IoT. I=E2=80=99m sure the protocol would gladly com=
e back to<br>
its roots.<br>
<br>
=C2=A0 =C2=A0A routing protocol for a VANET may cause redundant wireless fr=
ames in<br>
=C2=A0 =C2=A0the air to check the neighborhood of each vehicle and compute =
the<br>
=C2=A0 =C2=A0routing information in a VANET with a dynamic network topology=
<br>
=C2=A0 =C2=A0because the IPv6 ND is used to check the neighborhood of each<=
br>
=C2=A0 =C2=A0vehicle.=C2=A0 Thus, the vehicular routing needs to take advan=
tage of the<br>
=C2=A0 =C2=A0IPv6 ND to minimize its control overhead.<br>
<br>
&gt;&gt;&gt; A clean description of the interaction of RPL and RFC 8505 in =
our IoT<br>
networks. Note that the speed of the PHY in VANET balanced the instability =
of<br>
the topology, and RPL still applies. Note also that RPL uses DV with a rout=
ing<br>
stretch in order to minimize the topology awareness that=E2=80=99s needed i=
n each node,<br>
which results in minimal signaling.<br>
<br>
5.2.=C2=A0 Mobility Management<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For a mobility management scheme in a shared link, where the w=
ireless<br>
=C2=A0 =C2=A0subnets of multiple IP-RSUs share the same prefix, an efficien=
t<br>
=C2=A0 =C2=A0vehicular-network-wide DAD is required.=C2=A0 If DHCPv6 is use=
d to assign<br>
=C2=A0 =C2=A0a unique IPv6 address to each vehicle in this shared link,<br>
<br>
&gt;&gt;&gt; I would not use the term link, or shared. Maybe shared link -&=
gt; domain?<br>
&lt;snip&gt;<br>
<br>
the DAD is<br>
=C2=A0 =C2=A0not required.=C2=A0 On the other hand, for a mobility manageme=
nt scheme<br>
=C2=A0 =C2=A0with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] a=
nd OMNI<br>
=C2=A0 =C2=A0[OMNI]), DAD is not required because the IPv6 address of a veh=
icle&#39;s<br>
=C2=A0 =C2=A0external wireless interface is guaranteed to be unique.<br>
<br>
&gt;&gt;&gt; again overselling OMNI<br>
&gt;&gt;&gt; As I said earlier, this is wring there are (64*) more chances =
of a<br>
collision in OMNI prefixes than in IPv6 IIDs. &gt;&gt;&gt; OMNI prefixes ca=
n collision,<br>
home addresses that are unique on a home network cannot. &gt;&gt;&gt; Now i=
f both the<br>
OMNI prefix and the IID are good randoms, then obviously, the chances of<br=
>
collisions round up to 0. &gt;&gt;&gt; Collision is certainly not my worst =
fear.<br>
<br>
=C2=A0 There is a<br>
=C2=A0 =C2=A0tradeoff between the prefix usage efficiency and DAD overhead.=
=C2=A0 Thus,<br>
=C2=A0 =C2=A0the IPv6 address autoconfiguration for vehicular networks need=
s to<br>
=C2=A0 =C2=A0consider this tradeoff to support efficient mobility managemen=
t.<br>
<br>
&gt;&gt;&gt; This is way too superficial and hides the reality of things.<b=
r>
- Using a VANET Infra prefix allows direct routability to the internet whic=
h<br>
BYOA does not since the BYOA is not topologically correct. Yes, it costs a =
DAD<br>
with classic ND, but it does not with RCF8505 and the draft fails to mentio=
n<br>
that. - A BYOA needs a tunnel home, and the node needs to know who is reach=
able<br>
inside the VANET and what is not to decide to tunnel or not; this is a<br>
difficult problem (vs. control place overhead) that is not discussed here.<=
br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the case of a multihomed network, a vehicle can follow the=
 first-<br>
=C2=A0 =C2=A0hop router selection rule described in [RFC8028].=C2=A0 That i=
s, the<br>
=C2=A0 =C2=A0vehicle should select its default router for each prefix by<br=
>
=C2=A0 =C2=A0preferring the router that advertised the prefix.<br>
<br>
&gt;&gt;&gt; Still router discovery (in and out) must be very fast. Thing o=
f the RA<br>
intervale in MIPv6. Is that sufficient? Too expensive?<br>
<br>
&lt;snip&gt;<br>
<br>
6.=C2=A0 Security Considerations<br>
&gt;&gt;&gt; Any discussion on the security of classical ND and other opera=
tional issues<br>
(rfc6583) ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Security and privacy are paramount in V2I, V2V, and V2X networ=
king.<br>
=C2=A0 =C2=A0Vehicles and infrastructure must be authenticated in order to<=
br>
=C2=A0 =C2=A0participate in vehicular networking.=C2=A0 Also, in-vehicle de=
vices (e.g.,<br>
=C2=A0 =C2=A0ECU) and a driver/passenger&#39;s mobile devices (e.g., smartp=
hone and<br>
=C2=A0 =C2=A0tablet PC) in a vehicle need to communicate with other in-vehi=
cle<br>
=C2=A0 =C2=A0devices and another driver/passenger&#39;s mobile devices in a=
nother<br>
=C2=A0 =C2=A0vehicle, or other servers behind an IP-RSU in a secure way.=C2=
=A0 Even<br>
=C2=A0 =C2=A0though a vehicle is perfectly authenticated and legitimate, it=
 may be<br>
=C2=A0 =C2=A0hacked for running malicious applications to track and collect=
 its<br>
=C2=A0 =C2=A0and other vehicles&#39; information.=C2=A0 In this case, an at=
tack mitigation<br>
=C2=A0 =C2=A0process may be required to reduce the aftermath of malicious<b=
r>
=C2=A0 =C2=A0behaviors.<br>
<br>
&gt;&gt;&gt; The section should mention that both with classical ND and BYO=
A, addresses<br>
can be impersonated, and RFC 8928 protects against that in both cases while=
<br>
maintaining privacy.<br>
<br>
=C2=A0 =C2=A0Even though vehicles can be authenticated with valid certifica=
tes by<br>
=C2=A0 =C2=A0an authentication server in the vehicular cloud, the authentic=
ated<br>
<br>
&gt;&gt;&gt; Is PKI feasible (deploying it in every car?). Is it fast enoug=
h? Is it<br>
really what IPWAVE thinks vehicle should use????? &gt;&gt;&gt; e.g. why wou=
ld one need<br>
to authenticate to a V2I network? &gt;&gt;&gt; from the text earlier in the=
 doc, it<br>
seemed that what you really want is access that is fast to join, capable of=
<br>
offering the reachability you want, anonymous, and innocuous (cars can not =
harm<br>
one another).<br>
<br>
=C2=A0 =C2=A0vehicles may harm other vehicles, so their communication activ=
ities<br>
=C2=A0 =C2=A0need to be logged in either a central way through a logging se=
rver<br>
=C2=A0 =C2=A0(e.g., TCC) in the vehicular cloud or a distributed way (e.g.,=
<br>
=C2=A0 =C2=A0blockchain [Bitcoin]) along with other vehicles or infrastruct=
ure.<br>
=C2=A0 =C2=A0For the non-repudiation of the harmful activities of malicious=
 nodes,<br>
=C2=A0 =C2=A0a blockchain technology can be used [Bitcoin].=C2=A0 Each mess=
age from a<br>
=C2=A0 =C2=A0vehicle can be treated as a transaction and the neighboring ve=
hicles<br>
=C2=A0 =C2=A0can play the role of peers in a consensus method of a blockcha=
in<br>
=C2=A0 =C2=A0[Bitcoin][Vehicular-BlockChain].=C2=A0 For a blockchain&#39;s =
efficient<br>
=C2=A0 =C2=A0consensus in vehicular networks having fast moving vehicles, a=
 new<br>
=C2=A0 =C2=A0consensus algorithm needs to be developed or an existing conse=
nsus<br>
=C2=A0 =C2=A0algorithm needs to be enhanced.<br>
<br>
&gt;&gt;&gt; solution space; better express the=C2=A0 security needs since =
this is a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To identify malicious vehicles among vehicles, an authenticati=
on<br>
=C2=A0 =C2=A0method is required.<br>
<br>
&gt;&gt;&gt; No. As said earlier a vehicle can be infected. You need innocu=
ousness.which<br>
can come from things like isolation, zerotrust, and protocols that are<br>
difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 is<b=
r>
protected by construction, anonymous, and fast.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the setup of a secure channel over IPsec or TLS, the multi=
hop V2I<br>
=C2=A0 =C2=A0communications over DSRC is required in a highway for the<br>
=C2=A0 =C2=A0authentication by involving multiple intermediate vehicles as =
relay<br>
=C2=A0 =C2=A0nodes toward an IP-RSU connected to an authentication server i=
n the<br>
=C2=A0 =C2=A0vehicular cloud.=C2=A0 The V2I communications over 5G V2X (or =
LTE V2X) is<br>
=C2=A0 =C2=A0required to allow a vehicle to communicate directly with a gNo=
deB (or<br>
=C2=A0 =C2=A0eNodeB) connected to an authentication server in the vehicular=
 cloud.<br>
<br>
&gt;&gt;&gt; solution space. Instead, you could mention that setting up sec=
ured channels<br>
between cars that cross one another might not complete in time to establish=
 the<br>
communication channel, and that the innocuousness must come from zerotrust =
in<br>
the transactions between the cars.<br>
=C2=A0 =C2=A0For the IPv6 ND, the DAD is required to ensure the uniqueness =
of the<br>
=C2=A0 =C2=A0IPv6 address of a vehicle&#39;s wireless interface.<br>
<br>
&gt;&gt;&gt; for classical ND (SLAAC) that=E2=80=99s true. That is not with=
 RFC 8505, since the<br>
infra maintains a table of all addresses in use in the prefix and blocks<br=
>
duplicates without the RFC 4862 DAD method. The stateful autoconf address g=
rant<br>
is immediate.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This DAD can be used<br>
=C2=A0 =C2=A0as a flooding attack that uses the DAD-related ND packets<br>
=C2=A0 =C2=A0disseminated over the VANET or vehicular networks.<br>
<br>
&gt;&gt;&gt; also for DOS attacks. You can block a owner from using an addr=
ess. A<br>
reference to rfc6959 is much needed here.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0This possibility<br>
=C2=A0 =C2=A0indicates that the vehicles and IP-RSUs need to filter out sus=
picious<br>
=C2=A0 =C2=A0ND traffic in advance.=C2=A0 Based on the SEND [RFC3971] mecha=
nism, the<br>
=C2=A0 =C2=A0authentication for routers (i.e., IP-RSUs) can be conducted by=
 only<br>
=C2=A0 =C2=A0selecting an IP-RSU that has a certification path toward trust=
ed<br>
=C2=A0 =C2=A0parties.=C2=A0 For authenticating other vehicles, the cryptogr=
aphically<br>
=C2=A0 =C2=A0generated address (CGA) can be used to verify the true owner o=
f a<br>
=C2=A0 =C2=A0received ND message, which requires to use the CGA ND option i=
n the<br>
=C2=A0 =C2=A0ND protocols.=C2=A0 For a general protection of the ND mechani=
sm, the RSA<br>
=C2=A0 =C2=A0Signature ND option can also be used to protect the integrity =
of the<br>
=C2=A0 =C2=A0messages by public key signatures.=C2=A0 For a more advanced<b=
r>
=C2=A0 =C2=A0authentication mechanism, a distributed blockchain-based mecha=
nism<br>
=C2=A0 =C2=A0[Vehicular-BlockChain] can be used.<br>
<br>
&gt;&gt;&gt; solution space. Again, the draft should focus on problems and =
needs. The<br>
problem here is that SEND is complex, and not implemented in the major stac=
k.<br>
It relies on PKI for trusting the router. The V2I need is a zerotrust model=
<br>
where one V, the other local Vs, and the I, can help each other anonymously=
 and<br>
harmlessly. &lt;snip&gt;<br>
<br>
8.=C2=A0 Informative References<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&lt;snip&gt;<br>
<br>
Voila!<br>
<br>
Keep safe;<br>
<br>
Pascal<br>
<br>
<br>
<br>
_______________________________________________<br>
its mailing list<br>
<a href=3D"mailto:its@ietf.org" target=3D"_blank">its@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/its" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/its</a><u></u><u></u></span></font></p>
</blockquote>
</div>
</div>
</div>
</div>

</blockquote></div>

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Hi Pascal,
Thanks for your help to improve this draft significantly.

I have included your suggested text in the revision (-23) as follows:
https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networkin=
g-23
---------------------------------------------------------------------------=
-------------------------------------------------------------
Section 5.1.3. Routing
...
RPL [RFC6550] defines a routing protocol for low-power and
lossy networks, which constructs and maintains Destination-Oriented
Directed Acyclic Graphs (DODAGs) optimized by an Objective Function
(OF). A defined OF provides route selection and optimization within
an RPL topology. A node in a DODAG discovers and maintains the
upward routes toward the root node of the DODAG. RPL uses a Distance
Vector (DV) approach, with lazy maintenance and stretched anisotropic
routing. It is well-designed to reduce the topological knowledge and
routing state that needs to be exchanged. As a result, the routing
protocol overhead is minimized, which allows either highly
constrained stable networks or less constrained, highly dynamic
networks. Refer to Appendix B for the detailed description of RPL for
multihop V2X networking.

An address registration extension for 6LoWPAN (IPv6 over Low-Power
Wireless Personal Area Network) in [RFC8505] can support light-weight
mobility for nodes moving through different parents. [RFC8505], as
opposed to [RFC4861], is stateful and proactively installs the ND
cache entries, which saves broadcasts and provides a deterministic
presence information for IPv6 addresses. Mainly it updates the
Address Registration Option (ARO) of ND defined in [RFC6775] to
include a status field that can indicate the movement of a node and
optionally a Transaction ID (TID) field, i.e., a sequence number that
can be used to determine the most recent location of a node. Thus,
RPL can use the information provided by the Extended ARO (EARO)
defined in [RFC8505] to deal with a certain level of node mobility.
When a leaf node moves to the coverage of another parent node, it
should de-register its addresses to the previous parent node and
register itself with a new parent node along with an incremented TID.
---------------------------------------------------------------------------=
-------------------------------------------------------------

If you are satisfied with this revision, could you update
the status of INTDIR Last Call Review into Ready?
https://datatracker.ietf.org/doc/draft-ietf-ipwave-vehicular-networking/

Carlos and Erik,
If Pascal confirms the readiness of this draft,
let's move it out to the next step.

Thanks.

Best Regards,
Paul

On Fri, Sep 3, 2021 at 12:50 AM Pascal Thubert (pthubert) <
pthubert@cisco.com> wrote:

> You did well Paul, but I wonder if the reader of section 5.1 really cares
> about the guts of the protocols (DIO messages, who cares?) vs. what the
> protocol is optimized for.
>
>
>
> I had the same feeling about the next paragraph where you describe 8505.
> While what you are saying is correct is that of interest for the reader?
>
>
>
> The interesting piece IMHO is that 8505, as opposed to 4861,  is stateful
> and proactively installs the ND cache entries, which saves broadcasts and
> provides a deterministic presence information for IPv6 addresses=E2=80=9D=
. This is
> what I=E2=80=99d like to see written there. For the RPL piece, if you wan=
t to
> summarize my text, please insist on the fact that it=E2=80=99s =E2=80=9CD=
V, with lazy
> maintenance and stretched anisotropic routing, all designed to reduce the
> topological knowledge and routing state that needs to be exchanged. As a
> result, the routing protocol overhead is minimized, which allows either
> highly constrained stable networks or less constrained highly dynamic
> networks=E2=80=9D.
>
>
>
> *From:* Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
> *Sent:* jeudi 2 septembre 2021 17:30
> *To:* Pascal Thubert (pthubert) <pthubert@cisco.com>
> *Cc:* int-dir@ietf.org; Last Call <last-call@ietf.org>; its@ietf.org;
> Russ Housley <housley@vigilsec.com>; CARLOS JESUS BERNARDOS CANO <
> cjbc@it.uc3m.es>; Chris Shen <shenyiwen7@gmail.com>; Mr. Jaehoon Paul
> Jeong <jaehoon.paul@gmail.com>
> *Subject:* Re: [ipwave] Intdir last call review of
> draft-ietf-ipwave-vehicular-networking-20
>
>
>
> Hi Pascal,
>
> I have reflected your comments on the revision:
>
>
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-network=
ing-22
>
>
>
> Though the text provided by you is excellent, it is long, so I place it o=
n
> Appendix B:
>
>
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-network=
ing-22#appendix-B
>
>
>
> In Section 5.1.3.  Routing, I explain RPL concisely along with pros and
> cons:
>
>
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-network=
ing-22#section-5.1.3
>
>
>
> The changes with my some editings look like the following:
>
>
> -------------------------------------------------------------------------=
---------------------------------------------
>
> 5.1.3. Routing
> ...
> RPL [RFC6550] defines a routing protocol for low-power and lossy networks=
,
> which constructs and
>
> maintains DODAGs optimized by an Objective Function (OF). A defined OF
> provides route selection
>
> and optimization within an RPL topology. A node in a DODAG uses DODAG
> Information Objects (DIOs)
>
> messages to discover and maintain the upward routes toward the root node.
> Refer to Appendix B for
>
> the detailed description of RPL for multihop V2X networking.
> ...
> ----------
> Appendix B. Support of Multihop V2X Networking
> ...
> RPL is primarily designed to minimize the control plane activity, which i=
s
> the relative amount of routing
>
> protocol exchanges versus data traffic; this approach is beneficial for
> situations where the power and
>
> bandwidth are scarce (e.g., an IoT LLN where RPL is typically used today)=
,
> but also in situations of
>
> high relative mobility between the nodes in the network (also known as
> swarming, e.g., within a
>
> variable set of vehicles with a similar global motion, or a variable set
> of drones flying toward the same
>
> direction).
>
> To reduce the routing exchanges, RPL leverages a Distance Vector approach=
,
> which does not need a
>
> global knowledge of the topology, and only optimizes the routes to and
> from the root, allowing
>
> Peer-to-Peer (P2P) paths to be stretched. Although RPL installs its route=
s
> proactively, it only maintains
>
> them lazily, that is, in reaction to actual traffic, or as a slow
> background activity. Additionally, RPL
>
> leverages the concept of an objective function (called OF), which allows
> to adapt the activity of the
>
> routing protocol to use cases, e.g., type, speed, and quality of the
> radios. RPL does not need converge,
>
> and provides connectivity to most nodes most of the time. The default
> route toward the root is
>
> maintained aggressively and may change while a packet progresses without
> causing loops, so the
>
> packet will still reach the root. There are two modes for routing in RPL
> such as non-storing mode and
>
> storing mode. In non-storing mode, a node inside the mesh/swarm that
> changes its point(s) of
>
> attachment to the graph informs the root with a single unicast packet
> flowing along the default route,
>
> and the connectivity is restored immediately; this mode is preferable for
> use cases where Internet
>
> connectivity is dominant. On the other hand, in storing mode, the routing
> stretch is reduced, for a
>
> better P2P connectivity, while the Internet connectivity is restored more
> slowly, during the time for
>
> the DV operation to operate hop-by-hop. While an RPL topology can quickly
> scale up and down and
>
> fits the needs of mobility of vehicles, the total performance of the
> system will also depend on how
>
> quickly a node can form an address, join the mesh (including
> Authentication, Authorization, and
>
> Accounting (AAA)), and manage its global mobility to become reachable fro=
m
> another node outside
>
> the mesh.
> ...
>
>
> -------------------------------------------------------------------------=
---------------------------------------------
>
>
>
> If you have further comments, please let me know.
>
>
>
> Thanks.
>
>
>
> Best Regards,
>
> Paul
>
>
>
> On Thu, Sep 2, 2021 at 3:49 PM Pascal Thubert (pthubert) <
> pthubert@cisco.com> wrote:
>
> Hello Paul
>
>
>
> This is absolutely excellent. I=E2=80=99m very happy will all the changes=
 and your
> attached pdf made my life as a reviewer a lot simpler.
>
>
>
> This is really a great way of progressing together. Many thanks for that!
>
>
>
> I=E2=80=99m all good but for a little snippet in the new text which is ac=
tually
> incorrect, and denotes a usual misunderstanding of RPL that your doc may
> help correct for the future:
>
>
>
> =E2=80=9C
>
> Although RPL can be used in IPv6-based vehicular networks, it is primaril=
y
> designed for lossy
>
> networks, which puts energy efficiency first. In addition, the topology i=
t
> considers may not
>
> quickly scale up and down for IPv6-based vehicular networks, since the
> mobility of vehicles is
>
> much more diverse with a high speed, so it can frequently alter a
> tree-like topology formed by
>
> RPL, which may cause network fragmentation and merging with more control
> traffic
>
> =E2=80=9C
>
>
>
>
>
> The roots of my contribution to RPL are in vehicular networks, exactly th=
e
> use case you describe. Based on that experience (including some actual te=
st
> with NASA) I=E2=80=99d change the text above with:
>
>
>
>
>
> =E2=80=9C
>
> RPL is primarily designed to minimize the control plane activity, that is
> the relative amount of routing protocol exchanges vs. data traffic; this
> approach is beneficial for situations where the power and bandwidth are
> scarce (e.g., an IoT LLN where RPL is typically used today), but also in
> situations of high relative mobility between the nodes in the network (ak=
a
> swarming, e.g., within a variable set of vehicles with a similar global
> motion, or a toon of drones).
>
> To reduce the routing exchanges, RPL leverages a Distance Vector approach=
,
> which does not need a global knowledge of the topology, and only optimize=
s
> the routes to and from the root, allowing P2P paths to be stretched.
> Although RPL installs its routes proactively, it only maintains them
> lazily, in reaction to actual traffic, or as a slow background activity.
> Additionally, RPL leverages the concept of an objective function, which
> allows to adapt the activity of the routing protocol to the use case, e.g=
.,
> type, speed, and quality of the radios. RPL does not need converge, and
> provides connectivity to most nodes most of the time. The default route
> towards the Root is maintained aggressively and may change while a packet
> progresses without causing loops, so the packet will still reach the root=
.
> In non-storing mode, a node inside the mesh/swarm that changes its point(=
s)
> of attachment to the graph informs the root with a single unicast packet
> the flows along the default route, and the connectivity is restored
> immediately; this mode is preferable for use cases where internet
> connectivity is dominant. OTOH, in storing mode, the routing stretch is
> reduced, for a better P2P connectivity, while the internet connectivity i=
s
> restored more slowly, time for the DV operation to operate hop-by-hop.
> While a RPL topology can quickly scale up and down and fits the needs of
> mobility of vehicles, the total performance of the system will also depen=
d
> on how quickly a node can form an address, join the mesh (including AAA),
> and manage its global mobility to become reachable from outside the mesh.
>
> =E2=80=9C
>
>
>
> Otherwise, all good!
>
>
>
> Take care,
>
>
>
> Pascal
>
>
>
>
>
> *From:* Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
> *Sent:* lundi 30 ao=C3=BBt 2021 15:12
> *To:* Pascal Thubert (pthubert) <pthubert@cisco.com>
> *Cc:* int-dir@ietf.org; Last Call <last-call@ietf.org>;
> draft-ietf-ipwave-vehicular-networking.all@ietf.org; its@ietf.org; Russ
> Housley <housley@vigilsec.com>; CARLOS JESUS BERNARDOS CANO <
> cjbc@it.uc3m.es>; skku-iotlab-members <
> skku-iotlab-members@googlegroups.com>; Chris Shen <shenyiwen7@gmail.com>;
> Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
> *Subject:* Re: [ipwave] Intdir last call review of
> draft-ietf-ipwave-vehicular-networking-20
>
>
>
> Hi Pascal,
>
> Here is the revision (-21) of IPWAVE PS Draft:
>
>
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-network=
ing-21
>
>
>
> I attach the revision letter to show how I have addressed your comments o=
n
> the revision.
>
>
>
> Chris and I have worked for this revision together.
>
>
>
> If you have further comments, please let me know.
>
>
>
> Thanks.
>
>
>
> Best Regards,
>
> Paul
>
>
>
>
>
>
>
> On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert via Datatracker <
> noreply@ietf.org> wrote:
>
> Reviewer: Pascal Thubert
> Review result: Not Ready
>
> Dear authors
>
> In summary:
>
> I read a number of very good drafts collated in one, from the use cases
> that
> very complete and ready to publish, to the architecture and protocol
> solution
> in section 4 that would require more work for completeness.
>
> There are multiple instances in the use cases where protocols are listed
> coming
> out of the blue, e.g., the references to OMNI that seem artificially spre=
ad
> regardless of the context of the section. OMNI is used throughout, both a=
s
> an
> open ended toolbox, and as a carpet under which all problems can be hidde=
n.
>
> Reading this doc, OMNI shows as an interface to a software mobile router,
> with
> multiple of the device physical interfaces connected to the mobile router=
.
> This
> makes the stack very simple as the complexity moves to the router. But no=
w
> you
> have to implement the router. Presented as that, the OMNI router deserves
> its
> name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANET=
 (many to
> choose from) and NEMO (and all the MIP protocol family across address
> families), all the possible radio interfaces on which the ND problems go
> away
> by magic, and whatever else you want to put in there. Is that the
> intention?
>
> Instead of referring to OMNI for virtually anything, the doc should refer
> to
> MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),
> draft-nordmark-intarea-ippl for split subnets, and
> draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet
> models. And
> then you can say that all those components can be plugged in the OMNI
> router,
> and you can discuss which MANET and which MIP you want, including using
> OMNI=E2=80=99s
> built in mobility.
>
> Note that my objections are not against the OMNI design, it might be the
> perfect thing and I am already aware of use cases that could be served by=
 a
> P2MP interface like OMNI in conjunction with RFC8505 on the P2P
> subinterfaces
> (recycling the high level design we=E2=80=99ve been shipping for IPv4 / f=
rame
> relay for
> the last 30 years). My objection is of the way the draft uses [OMNI] as t=
he
> magic wand that solves all the problems when what you really do is throw
> them
> over the fence. I=E2=80=99d rather you focus on problems and use cases, f=
or which
> there=E2=80=99s excellent text, and indicate what needs to be done withou=
t making
> assumption on how the needful things will be solved.
>
> In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to s=
plit,
> keep all
> that=E2=80=99s use case and problem description and ship it, remove refer=
ences to
> protocols envisioned in the solution, and start the work on architecture
> of the
> solution and the protocol applicability statements separately. An alterna=
te
> would be to centralize the discussion on protocols to annex, and explain
> that
> protocol A or B could be envisioned in solution space because to over thi=
s
> gap
> or implement that function.
>
> In any fashion, the current text is not ready for publication as
> applicability
> statement, architecture and or/solution, so the related work should be
> removed
> from the main text. But I find it mostly ready for use case and problem
> statement, more below.
>
> Review:
>
> Abstract
>
>    This document discusses the problem statement and use cases of
>    IPv6-based vehicular networking for Intelligent Transportation
>    Systems (ITS).
>
> >>> The document goes beyond that; there was actually a thread at 6MAN
> where
> Bob Hinden said =E2=80=9C This document says it is a problem statement, b=
ut then
> becomes a solution document.   Might be better to cut it down to only the
> problem statement part. =E2=80=9C >>> Would you consider doing this? If n=
ot, why?
> Note:
> you may want to respond on 6MAN as well. >>> >>>I would have thought that
> the
> traditional steps of problem statement and applicability statement of
> existing
> work could be expected from IPWAVE too. >>> Please clarify the steps that
> you
> intend to follow next with this work.
>
> <snip>
>
> 1.  Introduction
>
> >>> Very readable and informative section, many thanks!
>
>    Along with these WAVE standards and C-V2X standards, regardless of a
>    wireless access technology under the IP stack of a vehicle, vehicular
>    networks can operate IP mobility with IPv6 [RFC8200] and Mobile IPv6
>    protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (PMIPv6)
>    [RFC5213], Distributed Mobility Management (DMM) [RFC7333], Locator/
>    ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Extended
>    Route Optimization (AERO) [RFC6706BIS]).
>
> >>> NEMO (RFC 3963) is not cited. Any reason why the vehicle would not
> transport a network?
>
> <snip>
>
>    This document describes use cases and a problem statement about
>    IPv6-based vehicular networking for ITS, which is named IPv6 Wireless
>    Access in Vehicular Environments (IPWAVE).  First, it introduces the
>    use cases for using V2V, V2I, and V2X networking in ITS.  Next, for
>    IPv6-based vehicular networks, it makes a gap analysis of current
>    IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Management,
>    and Security & Privacy), and then enumerates requirements for the
>    extensions of those IPv6 protocols, which are tailored to IPv6-based
>    vehicular networking.  Thus, this document is intended to motivate
>    development of key protocols for IPWAVE.
>
> >>>
>
> <snip>
>
> 2.  Terminology
>
> >>>
>
> <snip>
>
>    o  IP-OBU: "Internet Protocol On-Board Unit": An IP-OBU denotes a
>       computer situated in a vehicle (e.g., car, bicycle, autobike,
>       motor cycle, and a similar one) and a device (e.g., smartphone and
>       IoT device).  It has at least one IP interface that runs in IEEE
>       802.11-OCB and has an "OBU" transceiver.  Also, it may have an IP
>       interface that runs in Cellular V2X (C-V2X) [TS-23.285-3GPP]
>       [TR-22.886-3GPP][TS-23.287-3GPP].  See the definition of the term
>       "OBU" in [RFC8691].
>
> >>> Can that be a router connecting multiple computers?
>
> <snip>
>
> 3.  Use Cases
>
> >>> This is another great read and an enlightening section. Maybe mention
> in
> the abstract that the doc also covers use cases?
>
> <snip>
>
>    Although a Layer-2 solution can provide a support for multihop
>    communications in vehicular networks, the scalability issue related
>    to multihop forwarding still remains when vehicles need to
>    disseminate or forward packets toward multihop-away destinations.  In
>    addition, the IPv6-based approach for V2V as a network layer protocol
>    can accommodate multiple radio technologies as MAC protocols, such as
>    5G V2X and DSRC.  Therefore, the existing IPv6 protocol can be
>    augmented through the addition of an Overlay Multilink Network (OMNI)
>    Interface [OMNI] and/or protocol changes in order to support both
>    wireless single-hop/multihop V2V communications and multiple radio
>    technologies in vehicular networks.  In such a way, vehicles can
>    communicate with each other by V2V communications to share either an
>    emergency situation or road hazard in a highway having multiple kinds
>    of radio technologies, such as 5G V2X and DSRC.
>
> >>> This text appears in the middle of high level use case, with a crude
> list
> of protocols; this is not a place for it
>
> >>> On a 6MAN Thread, Brian Carpenter said that the above:
> =E2=80=9C
> is of concern regardless of the mention of OMNI. Does it mean "can be" or
> "needs to be"? This paragraph seems like a very short summary of a big
> problem
> area. At the end of page 13 there is some related discussion, which
> mentions
> RPL as part of the solution (good choice, IMHO) but again seems to depend
> on
> OMNI. I don't think the fix of simply removing references to OMNI works,
> because it would leave a gap. In an informational document, that is not a
> formal problem but as far as this draft describes architecture, I don't
> think
> that big a gap is reasonable. "OMNI" is mentioned more than 20 times in t=
he
> document. There are also several references to AERO, which is strongly
> associated with OMNI. =E2=80=9C >>> I agree with Brian. Here the document=
 seems to
> be
> mixing solution with problem and putting the cart before the horse. My
> recommendation is to stick to what needs to be done that IPv6 does not do
> yet
> -the reqs and gaps-; but the doc should not step in the how things will b=
e
> done
> unless the group already decided to do it. The logical next steps to a PS
> are
> an applicability statement of existing work, and if the gaps cannot be
> filled,
> there may be one or more WG chartered to fill those gaps.
>
> >>> I=E2=80=99d still be happy to see an annex with leads on where the so=
lution
> might
> come from like RFC 8691 does.
>
> <snip>
>
>    The existing IPv6 protocol must be augmented through the addition of
>    an OMNI interface and/or protocol changes in order to support
>    wireless multihop V2I communications in a highway where RSUs are
>    sparsely deployed, so a vehicle can reach the wireless coverage of an
>    RSU through the multihop data forwarding of intermediate vehicles.
>    Thus, IPv6 needs to be extended for multihop V2I communications.
>
> >>> Note that I have no clue on how well OMNI applies in that space, mayb=
e
> it
> does very well; but here it comes out of the blue with no justification.
> If you
> mention OMNI you need to detail what it is and which of the V2V  problems
> you
> expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.
>
> <snip>
>
>    The existing IPv6 protocol must be augmented through the addition of
>    an OMNI interface and/or protocol changes in order to support
>    wireless multihop V2X (or V2I2X) communications in an urban road
>    network where RSUs are deployed at intersections, so a vehicle (or a
>    pedestrian's smartphone) can reach the wireless coverage of an RSU
>    through the multihop data forwarding of intermediate vehicles (or
>    pedestrians' smartphones).  Thus, IPv6 needs to be extended for
>    multihop V2X (or V2I2X) communications.
>
> >>> Please be more specific on what the missing functions are and whether
> they
> are missing from the stack development standpoint or if there=E2=80=99s w=
ork needed
> from the IETF. 1)      If something is really missing in our specs, the
> text to
> prove from the use case above is missing 2)      how OMNI serves the use
> case
> could be elaborated in an applicability statement of OMNI for V2xyz, but
> it is
> a bit blunt to present it as panacea when the problems to be solved are n=
ot
> listed. 3)      If you look at it, OMNI seems like a software mobile rout=
er
> within a bump in the stack. Can that become too big?
>
> >>> my view is that the text above and the similar occasions should be
> replaced
> by something like :
>
>    The existing IPv6 protocol must be augmented to provide the following
>    functions: 1) =E2=80=A6
>
> >>> and / or something like:
>
>    In addition to the IPv6 node requirements [RFC 8504], the IPv6 protoco=
l
>    stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=A6
>
> <snip>
>
>    To support applications of these V2X use cases, the functions of IPv6
>    such as VND, VMM, and VSP are prerequisites for IPv6-based packet
>    exchange, transport-layer session continuity, and secure, safe
>    communication between a vehicle and a pedestrian either directly or
>    indirectly via an IP-RSU.
>
> >>> =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=9D doe=
s not parse.
> There=E2=80=99s
> no IPv6 reference that provides those functions. If the intention is to s=
ay
> that there=E2=80=99s stuff to add to IPv6 to support, like, say,  VND, th=
en this
> document fails to define how an IPv6 VND should behave, though it=E2=80=
=99s
> precisely
> what I=E2=80=99d expect from a problem statement.
>
> <snip>
>
> 4.  Vehicular Networks
>
> >>> What is the purpose of section 4 as a whole, problem statement or
> applicability statement of the listed protocols? In the former case what=
=E2=80=99s
> the
> problem? In the latter case it is incomplete and needs to be exported to =
an
> applicability statement doc with all the possible technologies evaluated.
>
>    This section describes an example vehicular network architecture
>    supporting V2V, V2I, and V2X communications in vehicular networks.
>
> >>> I read this as presenting a context to explain what the problems are
> instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe us=
ing the term
> =E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=99=
s comment.
>
> <snip>
>
> 4.1.  Vehicular Network Architecture
>
>    Figure 1 shows an example vehicular network architecture for V2I and
>    V2V in a road network [OMNI].
>
> a.      Is using OMNI a decision that the WG made for the future work ?
> what
> does it do and what does it not do? b.      Is there work left to be done=
?
> Who
> will do that work? Or is it the expectation that OMNI has it all defined
> already?
>
> <snip>
>
>    An existing network architecture (e.g., an IP-based aeronautical
>    network architecture [OMNI][UAM-ITS], a network architecture of
>    PMIPv6 [RFC5213], and a low-power and lossy network architecture
>    [RFC6550]) can be extended to a vehicular network architecture for
>    multihop V2V, V2I, and V2X, as shown in Figure 1.  In a highway
>    scenario, a vehicle may not access an RSU directly because of the
>    distance of the DSRC coverage (up to 1 km).  For example, the OMNI
>    interface and/or RPL (IPv6 Routing Protocol for Low-Power and Lossy
>    Networks) [RFC6550] can be extended to support a multihop V2I since a
>    vehicle can take advantage of other vehicles as relay nodes to reach
>    the RSU.  Also, RPL can be extended to support both multihop V2V and
>    V2X in the similar way.
>
> >>> all this could fit well in annex; anyway you need to explain what you
> expect the protocols to do and which extension is needed. In the case of
> RPL at
> least you indicate that it would do routing, but not why you cannot use i=
t
> of
> the shelf; for OMNI, what you expect is less clear, though there=E2=80=99=
s text
> elsewhere about the many radio interfaces that could be used for the
> purpose,
> and the text in the UAM below that is enlightening.
>
> <snip>
>
>                                   To support not only the mobility
>    management of the UAM end systems, but also the multihop and
>    multilink communications of the UAM interfaces, the UAM end systems
>    can employ an Overlay Multilink Network (OMNI) interface [OMNI] as a
>    virtual Non-Broadcast Multiple Access (NBMA) connection to a serving
>    ground domain infrastructure.
>
> >>> Again, what is the expectation for OMNI? As an overlay it requires an
> underlay; when connecting to a MANET it needs support for that MANET. The
> text
> above seems to imply that is solves everything in V2xyz like magic;
> reminds me
> of the IPv6 multicast abstraction that was supposed to solve the broadcas=
t
> problem and ended up worsening it.
>
> <snip>
>
>                             This infrastructure can be configured
>    over the underlying data links.  The OMNI interface and its link
>    model provide a means of multilink, multihop and mobility
>    coordination to the legacy IPv6 ND messaging [RFC4861] according to
>    the NBMA principle.  Thus, the OMNI link model can support efficient
>    UAM internetworking services without additional mobility messaging,
>    and without any modification to the IPv6 ND messaging services or
>    link model.
>
> >>> Again, what is the expectation for OMNI? As an overlay it requires an
> underlay; the text above seems to imply that is solves everything in V2xy=
z
> like
> magic; that would be a stretch, that reminds me of IPv6 multicast that wa=
s
> supposed to solve the broadcast problem and ended up worsening it.
>
> <snip>
>
>    Multiple vehicles under the coverage of an RSU share a prefix just as
>    mobile nodes share a prefix of a Wi-Fi access point in a wireless
>    LAN.  This is a natural characteristic in infrastructure-based
>    wireless networks.  For example, in Figure 1, two vehicles (i.e.,
>    Vehicle2, and Vehicle5) can use Prefix 1 to configure their IPv6
>    global addresses for V2I communication.  Alternatively, mobile nodes
>    can employ an OMNI interface and use their own IPv6 Unique Local
>    Addresses (ULAs) [RFC4193] over the wireless network without
>    requiring the messaging of IPv6 Stateless Address Autoconfiguration
>   (SLAAC) [RFC4862], which uses an on-link prefix provided by the
>    (visited) wireless LAN; this technique is known as "Bring-Your-Own-
>    Addresses".
>
> >>>  Is OMNI the only way to "Bring-Your-Own-Addresses=E2=80=9D? Else the=
 text
> could be
> more generic, at least use e.g., like the ref to AERO later. >>> What are
> the
> implications / limitations of doing that =E2=80=93 like they can do line =
of sight
> V2V
> but not reach the internet, or the need of  a local MANET / RPL that will
> accept to route those addresses, or the security / address ownership
> validation
> issues ?
>
> <snip>
>
>    A single subnet prefix announced by an RSU can span multiple vehicles
>    in VANET.  For example, in Figure 1, for Prefix 1, three vehicles
>    (i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a connected
>    VANET.  Also, for Prefix 2, two vehicles (i.e., Vehicle3 and
>    Vehicle6) can construct another connected VANET, and for Prefix 3,
>    two vehicles (i.e., Vehicle4 and Vehicle7) can construct another
>    connected VANET.  Alternatively, each vehicle could employ an OMNI
>    interface with their own ULAs such that no topologically-oriented
>    subnet prefixes need be announced by the RSU.
>
> >>>  same as above. This seems to restate the same thing, derive an addre=
ss
> from a topologically correct prefix or use your own with limitations to b=
e
> described.
>
> <snip>
>
>    For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]
>    specifies several details, including Maximum Transmission Unit (MTU),
>    frame format, link-local address, address mapping for unicast and
>    multicast, stateless autoconfiguration, and subnet structure.  An
>    Ethernet Adaptation (EA) layer is in charge of transforming some
>    parameters between the IEEE 802.11 MAC layer and the IPv6 network
>    layer, which is located between the IEEE 802.11-OCB's logical link
>    control layer and the IPv6 network layer.  This IPv6 over 802.11-OCB
>    can be used for both V2V and V2I in IPv6-based vehicular networks.
>
> >>>  solution space.
>
> <snip>
>
>    An IPv6 mobility solution is needed for the guarantee of
>    communication continuity in vehicular networks so that a vehicle's
>    TCP session can be continued, or UDP packets can be delivered to a
>    vehicle as a destination without loss while it moves from an IP-RSU's
>    wireless coverage to another IP-RSU's wireless coverage.  In
>    Figure 1, assuming that Vehicle2 has a TCP session (or a UDP session)
>    with a corresponding node in the vehicular cloud, Vehicle2 can move
>    from IP-RSU1's wireless coverage to IP-RSU2's wireless coverage.  In
>    this case, a handover for Vehicle2 needs to be performed by either a
>    host-based mobility management scheme (e.g., MIPv6 [RFC6275]) or a
>    network-based mobility management scheme (e.g., PMIPv6 [RFC5213] and
>    AERO [RFC6706BIS]).
>
>    In the host-based mobility scheme (e.g., MIPv6), an IP-RSU plays a
>    role of a home agent.  On the other hand, in the network-based
>    mobility scheme (e.g., PMIPv6, an MA plays a role of a mobility
>    management controller such as a Local Mobility Anchor (LMA) in
>    PMIPv6, which also serves vehicles as a home agent, and an IP-RSU
>    plays a role of an access router such as a Mobile Access Gateway
>    (MAG) in PMIPv6 [RFC5213].  The host-based mobility scheme needs
>    client functionality in IPv6 stack of a vehicle as a mobile node for
>    mobility signaling message exchange between the vehicle and home
>    agent.  On the other hand, the network-based mobility scheme does not
>    need such a client functionality for a vehicle because the network
>    infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility agent
>    handles the mobility signaling message exchange with the home agent
>    (e.g., LMA in PMIPv6) for the sake of the vehicle.
>
>    There are a scalability issue and a route optimization issue in the
>    network-based mobility scheme (e.g., PMIPv6) when an MA covers a
>    large vehicular network governing many IP-RSUs.  In this case, a
>    distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate the
>    scalability issue by distributing multiple MAs in the vehicular
>    network such that they are positioned closer to vehicles for route
>    optimization and bottleneck mitigation in a central MA in the
>    network-based mobility scheme.  All these mobility approaches (i.e.,
>    a host-based mobility scheme, network-based mobility scheme, and
>    distributed mobility scheme) and a hybrid approach of a combination
>    of them need to provide an efficient mobility service to vehicles
>    moving fast and moving along with the relatively predictable
>    trajectories along the roadways.
>
>    In vehicular networks, the control plane can be separated from the
>    data plane for efficient mobility management and data forwarding by
>    using the concept of Software-Defined Networking (SDN)
>    [RFC7149][DMM-FPC].  Note that Forwarding Policy Configuration (FPC)
>    in [DMM-FPC], which is a flexible mobility management system, can
>    manage the separation of data-plane and control-plane in DMM.  In
>    SDN, the control plane and data plane are separated for the efficient
>    management of forwarding elements (e.g., switches and routers) where
>    an SDN controller configures the forwarding elements in a centralized
>    way and they perform packet forwarding according to their forwarding
>    tables that are configured by the SDN controller.  An MA as an SDN
>    controller needs to efficiently configure and monitor its IP-RSUs and
>    vehicles for mobility management, location management, and security
>    services.
>
>    The mobility information of a GPS receiver mounted in its vehicle
>    (e.g., position, speed, and direction) can be used to accommodate
>    mobility-aware proactive handover schemes, which can perform the
>    handover of a vehicle according to its mobility and the wireless
>    signal strength of a vehicle and an IP-RSU in a proactive way.
>
>    Vehicles can use the TCC as their Home Network having a home agent
>    for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5213],
>    so the TCC (or an MA inside the TCC) maintains the mobility
>    information of vehicles for location management.  IP tunneling over
>    the wireless link should be avoided for performance efficiency.
>    Also, in vehicular networks, asymmetric links sometimes exist and
>    must be considered for wireless communications such as V2V and V2I.
>
> >>>  This is all very informative text but does not state a problem. Is
> there a
> problem is left to be solved or are we assessing the applicability of
> protocols? Could it for instance, forward point to issues discussed in
> section
> 5?
>
> <snip>
>
>    As shown in Figure 3, as internal networks, a vehicle's moving
>    network and an EN's fixed network are self-contained networks having
>    multiple subnets and having an edge router (e.g., IP-OBU and IP-RSU)
>    for the communication with another vehicle or another EN.  The
>    internetworking between two internal networks via V2I communication
>    requires the exchange of the network parameters and the network
>    prefixes of the internal networks.  For the efficiency, the network
>    prefixes of the internal networks (as a moving network) in a vehicle
>    need to be delegated and configured automatically.  Note that a
>    moving network's network prefix can be called a Mobile Network Prefix
>    (MNP) [OMNI].
>
> >>> Then again you=E2=80=99re overselling OMNI. MNP is originally defined=
 here
> https://datatracker.ietf.org/doc/html/rfc3963#section-2 and that=E2=80=99=
s a
> reference
> you can use normatively.
>
> <snip>
>
>    As shown in Figure 3, the addresses used for IPv6 transmissions over
>    the wireless link interfaces for IP-OBU and IP-RSU can be either
>    global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets can be
>    routed within vehicular networks [OMNI].
>
> >>> Then again you=E2=80=99re overselling OMNI. There needs to  be a rout=
ing
> protocol
> like a MANET that will accept to carry the
>  MNPs, and that must be implemented by the infra and both cars. The OMNI
> spec
>  is clear on that. This is why at first glance I see OMNI as a full mobil=
e
>  router in a bump in the stack. Now what is the problem behind this? No
> such
>  protocol at IETF? Too many to choose from? No deployment?
> <snip>
>
> When global IPv6 addresses
>    are used, wireless interface configuration and control overhead for
>    Duplicate Address Detection (DAD) [RFC4862] and Multicast Listener
>    Discovery (MLD) [RFC2710][RFC3810] should be minimized to support V2I
>    and V2X communications for vehicles moving fast along roadways; when
>    ULAs and the OMNI interface are used, no DAD nor MLD messaging is
>    needed.
>
> >>> Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it the no d=
ad needed a
> property
> of injecting a BYOA in the fabric for an GUA MIP Home Address which is
> known to
> be unique at home? >>> OTOH, autoconf=E2=80=99ing a random ULA =E2=80=9CF=
D=E2=80=A6=E2=80=9Dprefix has
> lesser
> DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classica=
l subnet.
> So
> who says DAD isn=E2=80=99t required for OMNI ULA? >>> note that IMHO DAD =
on
> wireless is
> a lot more harm than good, and I agree that with a good pseudo random
> generator
> the ULA has no chance to collision in the real world, as OMNI claims. It=
=E2=80=99s
> just
> that your argument here plays the other way, because there are less rando=
m
> bits
> (56)  in the ULA prefix than in the IID (62), and if one starts using mor=
e
> prefix bits to be non-random, there will be a time when DAD on prefix is
> needed.
>
> <snip>
>
>    Let us consider the upload/download time of a vehicle when it passes
>    through the wireless communication coverage of an IP-RSU.  For a
>    given typical setting where 1km is the maximum DSRC communication
>    range [DSRC] and 100km/h is the speed limit in highway, the dwelling
>    time can be calculated to be 72 seconds by dividing the diameter of
>    the 2km (i.e., two times of DSRC communication range where an IP-RSU
>    is located in the center of the circle of wireless communication) by
>    the speed limit of 100km/h (i.e., about 28m/s).  For the 72 seconds,
>    a vehicle passing through the coverage of an IP-RSU can upload and
>    download data packets to/from the IP-RSU.
>
> <snip>
>
> 4.3.  V2V-based Internetworking
>
> >>> In this section it looks like the cars are in a stable line of sight
> relationship. Which is probably fine for a platoon, but when you drive
> along
> with friends in different cars, you realize that the line of sight
> assumption
> does not stand over time. Soon enough, other cars meddle in, and possibly
> one
> of the cars drives faster and too far ahead so you need the infra to rela=
y,
> possibly over multiple infra hops.
>
> >>> so in this section, I=E2=80=99d expect to see a Vehicle communicating=
 with
> another
> one and using either line of sight or V2V relaying but also using relay
> via V2I
> (multihop I2I not just hub and spoke V2I2V ), alternatively to together f=
or
> redundancy. Is that part of the problem?
>
> >>> reading deeper section 5 I found excellent text on routing via V and
> via I.
> This tells that section 4 does not play a good role at justifying section
> 5.
> Maybe keep section 4 for another doc?
>
> >>> What kind or reliability is required in a V2V use case? Do you think
> ND can
> handle it? Or MANET? What would be the assumption on L2 (roaming time,
> unicast
> vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3
> redundancy?
>
> <snip>
>
> 5.  Problem Statement
>
> <snip>
>
>    In order to specify protocols using the architecture mentioned in
>    Section 4.1, IPv6 core protocols have to be adapted to overcome
>    certain challenging aspects of vehicular networking.  Since the
>    vehicles are likely to be moving at great speed, protocol exchanges
>    need to be completed in a time relatively short compared to the
>    lifetime of a link between a vehicle and an IP-RSU, or between two
>    vehicles.
>
> >>> Any order of magnitude?
> >>> Can you indicate whether this already rules out certain procedures,
> e.g.
> DAD ?
>
>    The lifetime of a session varies depending on the session's type such
>    as a web surfing, voice call over IP, and DNS query.  Regardless of a
>    session's type, to guide all the IPv6 packets to their destination
>    host, IP mobility should be supported for the session.
>
> >>> this seems to be for unicast when you know who to talk to. Is there a
> need
> some multicast groups like anybody around interested in topic blah like I
> could
> be multicasting the speed of vehicles coming the other way that I crossed
> recently, for use of vehicles that I=E2=80=99m crossing now, so they can =
see a
> slowdown
> on advance
>
>    Thus, the time constraint of a wireless link has a major impact on
>    IPv6 Neighbor Discovery (ND).  Mobility Management (MM) is also
>    vulnerable to disconnections that occur before the completion of
>    identity verification and tunnel management.  This is especially true
>    given the unreliable nature of wireless communication.  This section
>    presents key topics such as neighbor discovery and mobility
>    management.
>
> >>> Only ND? What about the MANET?
> >>> how fast should ND be to be suitable?
> >>> is there also a bandwidth check? You can make things much faster if y=
ou
> dedicate a lot of spectrum to it. But that can also be a waste.
>
> 5.1.  Neighbor Discovery
>
> <snip>
>
>    The requirements for IPv6 ND for vehicular networks are efficient DAD
>    and NUD operations.
>
> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast,
> which
> is a good idea in my book?
>
>  <snip>
>
>       This merging and partitioning should be considered for the
>    IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAAC)
>    [RFC4862].
>
> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast,
> which
> is a good idea in my book?
>
>  <snip>
>
>    Also, the partitioning of a VANET may make vehicles with the same
>    prefix be physically unreachable.  Also, SLAAC needs to prevent IPv6
>    address duplication due to the merging of VANETs.  According to the
>    merging and partitioning, a destination vehicle (as an IPv6 host)
>    needs to be distinguished as either an on-link host or an off-link
>    host even though the source vehicle uses the same prefix as the
>    destination vehicle.
>
> >>> should reference to draft-nordmark-intarea-ippl
>
>    To efficiently prevent IPv6 address duplication due to the VANET
>    partitioning and merging from happening in vehicular networks, the
>    vehicular networks need to support a vehicular-network-wide DAD by
>    defining a scope that is compatible with the legacy DAD.  In this
>    case, two vehicles can communicate with each other when there exists
>    a communication path over VANET or a combination of VANETs and IP-
>    RSUs, as shown in Figure 1.  By using the vehicular-network-wide DAD,
>    vehicles can assure that their IPv6 addresses are unique in the
>    vehicular network whenever they are connected to the vehicular
>    infrastructure or become disconnected from it in the form of VANET.
>
> >>> Excellent
>
>    ND time-related parameters such as router lifetime and Neighbor
>    Advertisement (NA) interval need to be adjusted for vehicle speed and
>    vehicle density.  For example, the NA interval needs to be
>    dynamically adjusted according to a vehicle's speed so that the
>    vehicle can maintain its neighboring vehicles in a stable way,
>    considering the collision probability with the NA messages sent by
>    other vehicles.
>
> >>> Is that a problem or just an operational setting that needs to be
> found?
> >>> Do we need to reconsider the concepts of those timers?
>
> <snip>
>
>    Thus, in IPv6-based vehicular networking, IPv6 ND should have minimum
>    changes for the interoperability with the legacy IPv6 ND used in the
>    Internet, including the DAD and NUD operations.
>
> >>> I do not find the logical link with the text before, why is this a
> =E2=80=9Cthus=E2=80=9D?
> >>> why should the ND inside the VANET be constrained to be interoperable=
?
> This
> may place constraints on the solution.
>
> 5.1.1.  Link Model
>
>    A prefix model for a vehicular network needs to facilitate the
>
> >>> Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=80=9Cp=
refix model=E2=80=9D.
> >>> it would make this piece and the next should refer to
> draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both
> link
> and subnet issues. The general ideas are the same, but the gory details
> here
> are slightly incorrect, like this notion of prefix model than comes out o=
f
> the
> blue. The model is really the subnet model for the subnet associated to
> P2MP.
>
>    communication between two vehicles with the same prefix regardless of
>    the vehicular network topology as long as there exist bidirectional
>    E2E paths between them in the vehicular network including VANETs and
>    IP-RSUs.  This prefix model allows vehicles with the same prefix to
>    communicate with each other via a combination of multihop V2V and
>    multihop V2I with VANETs and IP-RSUs.  Note that the OMNI interface
>    supports an NBMA link model where multihop V2V and V2I communications
>    use each mobile node's ULAs without need for any DAD or MLD
>    messaging.
>
> >>> again overselling OMNI.
> >>> I kinda agree about the OMNI interface model, nothing against that.
> But you
> must see that there needs a lot more than what the OMNI interface to get
> packets across V and I hops to the destination. Like routing ala MANET,
> redundancy handling ala DetNet because it will be very lossy, path
> management
> ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND so=
 it does
> not
> solve the ND problems above.
>
>    IPv6 protocols work under certain assumptions that do not necessarily
>    hold for vehicular wireless access link types other than OMNI/NBMA
>    [VIP-WAVE][RFC5889]; the rest of this section discusses implications
>    for those link types that do not apply when the OMNI/NBMA link model
>
> >>> again overselling OMNI.
> >>> The keyword here is P2MP / NBMA, and OMNI is one interface that accep=
ts
> that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already P=
2MP /
> NBMA,
> using routing to complete the partial mesh in P2MP. The text seems to imp=
ly
> that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI =
is loaded
> with
> other stuff than a plain P2MP capable interface. And ND over P2MP is not
> done
> by OMNI, OMNI only makes classical ND worse and only works in a full mesh=
.
> OTOH
> RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work ver=
y
> well
> within an OMNI interface and solve those problems. >>> My point is that y=
ou
> need to tell the full story or refrain from entering solution space in
> this doc
>
> <snip>
>
>    There is a relationship between a link and a prefix, besides the
>    different scopes that are expected from the link-local and global
>    types of IPv6 addresses.  In an IPv6 link, it is assumed that all
>    interfaces which are configured with the same subnet prefix and with
>    on-link bit set can communicate with each other on an IPv6 link.
>
> >>> not assumed; that=E2=80=99s what the onlink but set tells. The conclu=
sion
> should be
> that the VANET cannot set the O bit.
>
>    However, the vehicular link model needs to define the relationship
>    between a link and a prefix, considering the dynamics of wireless
>    links and the characteristics of VANET.
>
> <snip>
>
>    From the previous observation, a vehicular link model should consider
>    the frequent partitioning and merging of VANETs due to vehicle
>    mobility.  Therefore, the vehicular link model needs to use an on-
>    link prefix and off-link prefix according to the network topology of
>    vehicles such as a one-hop reachable network and a multihop reachable
>
> >>> No, the once a node saw a O bit set that sticks even if it sees other
> advertisements of the PIO with the O bit not set. >>> This is a global an=
d
> intrinsic property of the prefix (and an attack vector that could be
> mentioned
> in the sec section). >>> the VANET prefix must never come with the O bit
> set.
>
> <snip>
>
>    network (or partitioned networks).  If the vehicles with the same
>    prefix are reachable from each other in one hop, the prefix should be
>    on-link.
>
> >>>> No, see above; but the router may redirect though it is really risky
> unless this is a stable situation like a parking place.
>
>    Thus, in IPv6-based vehicular networking, the vehicular link model
>    should have minimum changes for interoperability with standard IPv6
>    links in an efficient fashion to support IPv6 DAD, MLD and NUD
>    operations.  When the OMNI NBMA link model is used, there are no link
>    model changes nor DAD/MLD messaging required.
>
> >>>> again overselling OMNI.
> >>>> You need a good P2MP subnet model with routing support when the mesh
> is
> partial. My company alone has been shipping million of nodes that build
> subnets
> of thousands, and that was done using IETF standards.
>
> <snip>
>
>    For vehicular networks with high mobility and density, the DAD needs
>    to be performed efficiently with minimum overhead so that the
>    vehicles can exchange a driving safety message (e.g., collision
>    avoidance and accident notification) with each other with a short
>    interval (e.g., 0.5 second) by a technical report from NHTSA
>    (National Highway Traffic Safety Administration) [NHTSA-ACAS-Report].
>    Such a driving safety message may include a vehicle's mobility
>    information (i.e., position, speed, direction, and acceleration/
>    deceleration).  The exchange interval of this message is 0.5 second,
>    which is required to allow a driver to avoid a rear-end crash from
>    another vehicle.
>
> >>> IPv6 over broadcast MAC (used to be called internet 0, 10+ years ago)
> solves that MAC issue since there is no MAC.
>
> 5.1.3.  Routing
>
>    For multihop V2V communications in either a VANET or VANETs via IP-
>    RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing protocol may
>    be required to support both unicast and multicast in the links of the
>    subnet with the same IPv6 prefix.  However, it will be costly to run
>    both vehicular ND and a vehicular ad hoc routing protocol in terms of
>    control traffic overhead [ID-Multicast-Problems].
>
> >>> we do that with IETF standards on battery operated devices already.
> Using
> RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve s=
een 30
> hops in
> meshes of thousands in the real world though it=E2=80=99s not the normal
> operational
> model, but can happen to maintain connectivity during the reboot of a
> root) and
> does not use broadcast. RPL was initially designed as a V2V2V protocol bu=
t
> found its market on the IoT. I=E2=80=99m sure the protocol would gladly c=
ome back
> to
> its roots.
>
>    A routing protocol for a VANET may cause redundant wireless frames in
>    the air to check the neighborhood of each vehicle and compute the
>    routing information in a VANET with a dynamic network topology
>    because the IPv6 ND is used to check the neighborhood of each
>    vehicle.  Thus, the vehicular routing needs to take advantage of the
>    IPv6 ND to minimize its control overhead.
>
> >>> A clean description of the interaction of RPL and RFC 8505 in our IoT
> networks. Note that the speed of the PHY in VANET balanced the instabilit=
y
> of
> the topology, and RPL still applies. Note also that RPL uses DV with a
> routing
> stretch in order to minimize the topology awareness that=E2=80=99s needed=
 in each
> node,
> which results in minimal signaling.
>
> 5.2.  Mobility Management
>
> <snip>
>
>    For a mobility management scheme in a shared link, where the wireless
>    subnets of multiple IP-RSUs share the same prefix, an efficient
>    vehicular-network-wide DAD is required.  If DHCPv6 is used to assign
>    a unique IPv6 address to each vehicle in this shared link,
>
> >>> I would not use the term link, or shared. Maybe shared link -> domain=
?
> <snip>
>
> the DAD is
>    not required.  On the other hand, for a mobility management scheme
>    with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] and OMNI
>    [OMNI]), DAD is not required because the IPv6 address of a vehicle's
>    external wireless interface is guaranteed to be unique.
>
> >>> again overselling OMNI
> >>> As I said earlier, this is wring there are (64*) more chances of a
> collision in OMNI prefixes than in IPv6 IIDs. >>> OMNI prefixes can
> collision,
> home addresses that are unique on a home network cannot. >>> Now if both
> the
> OMNI prefix and the IID are good randoms, then obviously, the chances of
> collisions round up to 0. >>> Collision is certainly not my worst fear.
>
>   There is a
>    tradeoff between the prefix usage efficiency and DAD overhead.  Thus,
>    the IPv6 address autoconfiguration for vehicular networks needs to
>    consider this tradeoff to support efficient mobility management.
>
> >>> This is way too superficial and hides the reality of things.
> - Using a VANET Infra prefix allows direct routability to the internet
> which
> BYOA does not since the BYOA is not topologically correct. Yes, it costs =
a
> DAD
> with classic ND, but it does not with RCF8505 and the draft fails to
> mention
> that. - A BYOA needs a tunnel home, and the node needs to know who is
> reachable
> inside the VANET and what is not to decide to tunnel or not; this is a
> difficult problem (vs. control place overhead) that is not discussed here=
.
>
> <snip>
>
>    For the case of a multihomed network, a vehicle can follow the first-
>    hop router selection rule described in [RFC8028].  That is, the
>    vehicle should select its default router for each prefix by
>    preferring the router that advertised the prefix.
>
> >>> Still router discovery (in and out) must be very fast. Thing of the R=
A
> intervale in MIPv6. Is that sufficient? Too expensive?
>
> <snip>
>
> 6.  Security Considerations
> >>> Any discussion on the security of classical ND and other operational
> issues
> (rfc6583) ?
>
> <snip>
>
>    Security and privacy are paramount in V2I, V2V, and V2X networking.
>    Vehicles and infrastructure must be authenticated in order to
>    participate in vehicular networking.  Also, in-vehicle devices (e.g.,
>    ECU) and a driver/passenger's mobile devices (e.g., smartphone and
>    tablet PC) in a vehicle need to communicate with other in-vehicle
>    devices and another driver/passenger's mobile devices in another
>    vehicle, or other servers behind an IP-RSU in a secure way.  Even
>    though a vehicle is perfectly authenticated and legitimate, it may be
>    hacked for running malicious applications to track and collect its
>    and other vehicles' information.  In this case, an attack mitigation
>    process may be required to reduce the aftermath of malicious
>    behaviors.
>
> >>> The section should mention that both with classical ND and BYOA,
> addresses
> can be impersonated, and RFC 8928 protects against that in both cases whi=
le
> maintaining privacy.
>
>    Even though vehicles can be authenticated with valid certificates by
>    an authentication server in the vehicular cloud, the authenticated
>
> >>> Is PKI feasible (deploying it in every car?). Is it fast enough? Is i=
t
> really what IPWAVE thinks vehicle should use????? >>> e.g. why would one
> need
> to authenticate to a V2I network? >>> from the text earlier in the doc, i=
t
> seemed that what you really want is access that is fast to join, capable =
of
> offering the reachability you want, anonymous, and innocuous (cars can no=
t
> harm
> one another).
>
>    vehicles may harm other vehicles, so their communication activities
>    need to be logged in either a central way through a logging server
>    (e.g., TCC) in the vehicular cloud or a distributed way (e.g.,
>    blockchain [Bitcoin]) along with other vehicles or infrastructure.
>    For the non-repudiation of the harmful activities of malicious nodes,
>    a blockchain technology can be used [Bitcoin].  Each message from a
>    vehicle can be treated as a transaction and the neighboring vehicles
>    can play the role of peers in a consensus method of a blockchain
>    [Bitcoin][Vehicular-BlockChain].  For a blockchain's efficient
>    consensus in vehicular networks having fast moving vehicles, a new
>    consensus algorithm needs to be developed or an existing consensus
>    algorithm needs to be enhanced.
>
> >>> solution space; better express the  security needs since this is a PS=
.
>
> <snip>
>
>    To identify malicious vehicles among vehicles, an authentication
>    method is required.
>
> >>> No. As said earlier a vehicle can be infected. You need
> innocuousness.which
> can come from things like isolation, zerotrust, and protocols that are
> difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 is
> protected by construction, anonymous, and fast.
>
> <snip>
>
>    For the setup of a secure channel over IPsec or TLS, the multihop V2I
>    communications over DSRC is required in a highway for the
>    authentication by involving multiple intermediate vehicles as relay
>    nodes toward an IP-RSU connected to an authentication server in the
>    vehicular cloud.  The V2I communications over 5G V2X (or LTE V2X) is
>    required to allow a vehicle to communicate directly with a gNodeB (or
>    eNodeB) connected to an authentication server in the vehicular cloud.
>
> >>> solution space. Instead, you could mention that setting up secured
> channels
> between cars that cross one another might not complete in time to
> establish the
> communication channel, and that the innocuousness must come from zerotrus=
t
> in
> the transactions between the cars.
>    For the IPv6 ND, the DAD is required to ensure the uniqueness of the
>    IPv6 address of a vehicle's wireless interface.
>
> >>> for classical ND (SLAAC) that=E2=80=99s true. That is not with RFC 85=
05, since
> the
> infra maintains a table of all addresses in use in the prefix and blocks
> duplicates without the RFC 4862 DAD method. The stateful autoconf address
> grant
> is immediate.
>
>                                This DAD can be used
>    as a flooding attack that uses the DAD-related ND packets
>    disseminated over the VANET or vehicular networks.
>
> >>> also for DOS attacks. You can block a owner from using an address. A
> reference to rfc6959 is much needed here.
>
> <snip>
>
>  This possibility
>    indicates that the vehicles and IP-RSUs need to filter out suspicious
>    ND traffic in advance.  Based on the SEND [RFC3971] mechanism, the
>    authentication for routers (i.e., IP-RSUs) can be conducted by only
>    selecting an IP-RSU that has a certification path toward trusted
>    parties.  For authenticating other vehicles, the cryptographically
>    generated address (CGA) can be used to verify the true owner of a
>    received ND message, which requires to use the CGA ND option in the
>    ND protocols.  For a general protection of the ND mechanism, the RSA
>    Signature ND option can also be used to protect the integrity of the
>    messages by public key signatures.  For a more advanced
>    authentication mechanism, a distributed blockchain-based mechanism
>    [Vehicular-BlockChain] can be used.
>
> >>> solution space. Again, the draft should focus on problems and needs.
> The
> problem here is that SEND is complex, and not implemented in the major
> stack.
> It relies on PKI for trusting the router. The V2I need is a zerotrust mod=
el
> where one V, the other local Vs, and the I, can help each other
> anonymously and
> harmlessly. <snip>
>
> 8.  Informative References
>
> >>> no normative reference?
>
> >>> no normative reference?
>
> <snip>
>
> Voila!
>
> Keep safe;
>
> Pascal
>
>
>
> _______________________________________________
> its mailing list
> its@ietf.org
> https://www.ietf.org/mailman/listinfo/its
>
>

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<div dir=3D"ltr">Hi Pascal,<div>Thanks=C2=A0for your help to improve this d=
raft significantly.<br></div><div><br></div><div>I have included your sugge=
sted text in the revision (-23) as follows:</div><div><a href=3D"https://da=
tatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networking-23">http=
s://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networking-23=
</a></div><div>------------------------------------------------------------=
---------------------------------------------------------------------------=
-</div><div>Section 5.1.3. Routing<br>...<br>RPL [RFC6550] defines a routin=
g protocol for low-power and<br>lossy networks, which constructs and mainta=
ins Destination-Oriented<br>Directed Acyclic Graphs (DODAGs) optimized by a=
n Objective Function<br>(OF). A defined OF provides route selection and opt=
imization within<br>an RPL topology. A node in a DODAG discovers and mainta=
ins the<br>upward routes toward the root node of the DODAG. RPL uses a Dist=
ance<br>Vector (DV) approach, with lazy maintenance and stretched anisotrop=
ic<br>routing. It is well-designed to reduce the topological knowledge and<=
br>routing state that needs to be exchanged. As a result, the routing<br>pr=
otocol overhead is minimized, which allows either highly<br>constrained sta=
ble networks or less constrained, highly dynamic<br>networks. Refer to Appe=
ndix B for the detailed description of RPL for<br>multihop V2X networking.<=
br><br>An address registration extension for 6LoWPAN (IPv6 over Low-Power<b=
r>Wireless Personal Area Network) in [RFC8505] can support light-weight<br>=
mobility for nodes moving through different parents. [RFC8505], as<br>oppos=
ed to [RFC4861], is stateful and proactively installs the ND<br>cache entri=
es, which saves broadcasts and provides a deterministic<br>presence informa=
tion for IPv6 addresses. Mainly it updates the<br>Address Registration Opti=
on (ARO) of ND defined in [RFC6775] to<br>include a status field that can i=
ndicate the movement of a node and<br>optionally a Transaction ID (TID) fie=
ld, i.e., a sequence number that<br>can be used to determine the most recen=
t location of a node. Thus,<br>RPL can use the information provided by the =
Extended ARO (EARO)<br>defined in [RFC8505] to deal with a certain level of=
 node mobility.<br>When a leaf node moves to the coverage of another parent=
 node, it<br>should de-register its addresses to the previous parent node a=
nd<br>register itself with a new parent node along with an incremented TID.=
<br></div><div>------------------------------------------------------------=
---------------------------------------------------------------------------=
-</div><div><br></div><div>If you are satisfied with this revision, could y=
ou update</div><div>the status of INTDIR Last Call Review into Ready?<br></=
div><div><a href=3D"https://datatracker.ietf.org/doc/draft-ietf-ipwave-vehi=
cular-networking/">https://datatracker.ietf.org/doc/draft-ietf-ipwave-vehic=
ular-networking/</a><br></div><div><br></div><div>Carlos and Erik,</div><di=
v>If Pascal confirms the readiness of this draft,</div><div>let&#39;s move =
it out to the next step.</div><div><br></div><div>Thanks.</div><div><br></d=
iv><div>Best Regards,</div><div>Paul</div></div><br><div class=3D"gmail_quo=
te"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Sep 3, 2021 at 12:50 AM P=
ascal Thubert (pthubert) &lt;<a href=3D"mailto:pthubert@cisco.com" target=
=3D"_blank">pthubert@cisco.com</a>&gt; wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">You did well Paul, but I wonder if the reader of section 5.1 r=
eally cares about the guts of the protocols (DIO messages, who cares?) vs. =
what the protocol is optimized for.<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">I had the same feeling about the next paragraph where you desc=
ribe 8505. While what you are saying is correct is that of interest for the=
 reader?
<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">The interesting piece IMHO is that 8505, as opposed to 4861, =
=C2=A0is stateful and proactively installs the ND cache entries, which save=
s broadcasts and provides a deterministic presence
 information for IPv6 addresses=E2=80=9D. This is what I=E2=80=99d like to =
see written there. For the RPL piece, if you want to summarize my text, ple=
ase insist on the fact that it=E2=80=99s =E2=80=9CDV, with lazy maintenance=
 and stretched anisotropic routing, all designed to reduce the topological
 knowledge and routing state that needs to be exchanged. As a result, the r=
outing protocol overhead is minimized, which allows either highly constrain=
ed stable networks or less constrained highly dynamic networks=E2=80=9D.<u>=
</u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0cm 0cm 0cm 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><span style=3D"=
font-size:11pt;font-weight:bold">From:</span></font></b> Mr. Jaehoon Paul J=
eong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" target=3D"_blank">jaehoo=
n.paul@gmail.com</a>&gt;
<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> jeudi 2 septembre 2021=
 17:30<br>
<b><span style=3D"font-weight:bold">To:</span></b> Pascal Thubert (pthubert=
) &lt;<a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisc=
o.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Cc:</span></b> <a href=3D"mailto:int-di=
r@ietf.org" target=3D"_blank">int-dir@ietf.org</a>; Last Call &lt;<a href=
=3D"mailto:last-call@ietf.org" target=3D"_blank">last-call@ietf.org</a>&gt;=
; <a href=3D"mailto:its@ietf.org" target=3D"_blank">its@ietf.org</a>; Russ =
Housley &lt;<a href=3D"mailto:housley@vigilsec.com" target=3D"_blank">housl=
ey@vigilsec.com</a>&gt;; CARLOS JESUS BERNARDOS CANO &lt;<a href=3D"mailto:=
cjbc@it.uc3m.es" target=3D"_blank">cjbc@it.uc3m.es</a>&gt;; Chris Shen &lt;=
<a href=3D"mailto:shenyiwen7@gmail.com" target=3D"_blank">shenyiwen7@gmail.=
com</a>&gt;; Mr. Jaehoon Paul Jeong &lt;<a href=3D"mailto:jaehoon.paul@gmai=
l.com" target=3D"_blank">jaehoon.paul@gmail.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Subject:</span></b> Re: [ipwave] Intdir=
 last call review of draft-ietf-ipwave-vehicular-networking-20<u></u><u></u=
></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Hi Pascal,<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">I have reflected your comments on=C2=A0the revision:<u></u><u>=
</u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-ip=
wave-vehicular-networking-22" target=3D"_blank">https://datatracker.ietf.or=
g/doc/html/draft-ietf-ipwave-vehicular-networking-22</a><u></u><u></u></spa=
n></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Though the text provided by you is excellent, it is long, so I=
 place it on Appendix B:<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-ip=
wave-vehicular-networking-22#appendix-B" target=3D"_blank">https://datatrac=
ker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networking-22#appendix-B<=
/a><u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">In Section=C2=A05.1.3.=C2=A0 Routing, I explain RPL concisely =
along with pros and cons:<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-ip=
wave-vehicular-networking-22#section-5.1.3" target=3D"_blank">https://datat=
racker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networking-22#section-=
5.1.3</a><u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">The changes with my some editings look like the following:<u><=
/u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">--------------------------------------------------------------=
--------------------------------------------------------<u></u><u></u></spa=
n></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">5.1.3. Routing<br>
...<br>
RPL [RFC6550] defines a routing protocol for low-power and lossy networks, =
which constructs and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">maintains DODAGs optimized by an Objective Function (OF). A de=
fined OF provides route selection<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">and optimization within an RPL topology. A node in a DODAG use=
s DODAG Information Objects (DIOs)<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">messages to discover and maintain the upward routes toward the=
 root node. Refer to Appendix B for<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">the detailed description of RPL for multihop V2X networking.<b=
r>
...<br>
----------<br>
Appendix B. Support of Multihop V2X Networking<br>
...<br>
RPL is primarily designed to minimize the control plane activity, which is =
the relative amount of routing<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">protocol exchanges versus data traffic; this approach is benef=
icial for situations where the power and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">bandwidth are scarce (e.g., an IoT LLN where RPL is typically =
used today), but also in situations of<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">high relative mobility between the nodes in the network (also =
known as swarming, e.g., within a<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">variable set of vehicles with a similar global motion, or a va=
riable set of drones flying toward the same<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">direction).<br>
<br>
To reduce the routing exchanges, RPL leverages a Distance Vector approach, =
which does not need a<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">global knowledge of the topology, and only optimizes the route=
s to and from the root, allowing<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Peer-to-Peer (P2P) paths to be stretched. Although RPL install=
s its routes proactively, it only maintains<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">them lazily, that is, in reaction to actual traffic, or as a s=
low background activity. Additionally, RPL<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">leverages the concept of an objective function (called OF), wh=
ich allows to adapt the activity of the<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">routing protocol to use cases, e.g., type, speed, and quality =
of the radios. RPL does not need converge,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">and provides connectivity to most nodes most of the time. The =
default route toward the root is<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">maintained aggressively and may change while a packet progress=
es without causing loops, so the<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">packet will still reach the root. There are two modes for rout=
ing in RPL such as non-storing mode and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">storing mode. In non-storing mode, a node inside the mesh/swar=
m that changes its point(s) of<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">attachment to the graph informs the root with a single unicast=
 packet flowing along the default route,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">and the connectivity is restored immediately; this mode is pre=
ferable for use cases where Internet<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">connectivity is dominant. On the other hand, in storing mode, =
the routing stretch is reduced, for a<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">better P2P connectivity, while the Internet connectivity is re=
stored more slowly, during the time for<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">the DV operation to operate hop-by-hop. While an RPL topology =
can quickly scale up and down and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">fits the needs of mobility of vehicles, the total performance =
of the system will also depend on how<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">quickly a node can form an address, join the mesh (including A=
uthentication, Authorization, and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Accounting (AAA)), and manage its global mobility to become re=
achable from another node outside<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">the mesh.<br>
...<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">--------------------------------------------------------------=
--------------------------------------------------------<u></u><u></u></spa=
n></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">If you=C2=A0have further comments, please let me know.<u></u><=
u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Thanks.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Best Regards,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Paul<u></u><u></u></span></font></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">On Thu, Sep 2, 2021 at 3:49 PM Pascal Thubert (pthubert) &lt;<=
a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisco.com</=
a>&gt; wrote:<u></u><u></u></span></font></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0c=
m 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Hello Paul<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">This is absolutely excellent. I=E2=80=99m very happy will all =
the changes and your attached pdf made my life as a reviewer a
 lot simpler. <u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">This is really a great way of progressing together. Many thank=
s for that!<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">I=E2=80=99m all good but for a little snippet in the new text =
which is actually incorrect, and denotes a usual misunderstanding
 of RPL that your doc may help correct for the future:<u></u><u></u></span>=
</font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Although RPL can be used in IPv6-based veh=
icular networks, it is primarily designed for lossy</span></font><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">networks, which puts energy efficiency fir=
st. In addition, the topology it considers may not</span></font><u></u><u><=
/u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">quickly scale up and down for IPv6-based v=
ehicular networks, since the mobility of vehicles is</span></font><u></u><u=
></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">much more diverse with a high speed, so it=
 can frequently alter a tree-like topology formed by</span></font><u></u><u=
></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">RPL, which may cause network fragmentation=
 and merging with more control traffic</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=E2=80=9C</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">The roots of my contribution to RPL are in=
 vehicular networks, exactly the use case you describe.
 Based on that experience (including some actual test with NASA) I=E2=80=99=
d change the text above with:</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=E2=80=9C</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">RPL is primarily designed to minimize the =
control plane activity, that is the relative amount of
 routing protocol exchanges vs. data traffic; this approach is beneficial f=
or situations where the power and bandwidth are scarce (e.g., an IoT LLN wh=
ere RPL is typically used today), but also in situations of high relative m=
obility between the nodes in the
 network (aka swarming, e.g., within a variable set of vehicles with a simi=
lar global motion, or a toon of drones).</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">To reduce the routing exchanges, RPL lever=
ages a Distance Vector approach, which does not need a
 global knowledge of the topology, and only optimizes the routes to and fro=
m the root, allowing P2P paths to be stretched. Although RPL installs its r=
outes proactively, it only maintains them lazily, in reaction to actual tra=
ffic, or as a slow background activity.
 Additionally, RPL leverages the concept of an objective function, which al=
lows to adapt the activity of the routing protocol to the use case, e.g., t=
ype, speed, and quality of the radios. RPL does not need converge, and prov=
ides connectivity to most nodes
 most of the time. The default route towards the Root is maintained aggress=
ively and may change while a packet progresses without causing loops, so th=
e packet will still reach the root. In non-storing mode, a node inside the =
mesh/swarm that changes its point(s)
 of attachment to the graph informs the root with a single unicast packet t=
he flows along the default route, and the connectivity is restored immediat=
ely; this mode is preferable for use cases where internet connectivity is d=
ominant. OTOH, in storing mode,
 the routing stretch is reduced, for a better P2P connectivity, while the i=
nternet connectivity is restored more slowly, time for the DV operation to =
operate hop-by-hop. While a RPL topology can quickly scale up and down and =
fits the needs of mobility of vehicles,
 the total performance of the system will also depend on how quickly a node=
 can form an address, join the mesh (including AAA), and manage its global =
mobility to become reachable from outside the mesh.</span></font><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=E2=80=9C</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Otherwise, all good!</span></font><u></u><=
u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Take care,</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Pascal</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0cm 0cm 0cm 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><span style=3D"=
font-size:11pt;font-weight:bold">From:</span></font></b> Mr. Jaehoon Paul J=
eong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" target=3D"_blank">jaehoo=
n.paul@gmail.com</a>&gt;
<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> lundi 30 ao=C3=BBt 202=
1 15:12<br>
<b><span style=3D"font-weight:bold">To:</span></b> Pascal Thubert (pthubert=
) &lt;<a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisc=
o.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Cc:</span></b> <a href=3D"mailto:int-di=
r@ietf.org" target=3D"_blank">
int-dir@ietf.org</a>; Last Call &lt;<a href=3D"mailto:last-call@ietf.org" t=
arget=3D"_blank">last-call@ietf.org</a>&gt;;
<a href=3D"mailto:draft-ietf-ipwave-vehicular-networking.all@ietf.org" targ=
et=3D"_blank">
draft-ietf-ipwave-vehicular-networking.all@ietf.org</a>; <a href=3D"mailto:=
its@ietf.org" target=3D"_blank">
its@ietf.org</a>; Russ Housley &lt;<a href=3D"mailto:housley@vigilsec.com" =
target=3D"_blank">housley@vigilsec.com</a>&gt;; CARLOS JESUS BERNARDOS CANO=
 &lt;<a href=3D"mailto:cjbc@it.uc3m.es" target=3D"_blank">cjbc@it.uc3m.es</=
a>&gt;; skku-iotlab-members &lt;<a href=3D"mailto:skku-iotlab-members@googl=
egroups.com" target=3D"_blank">skku-iotlab-members@googlegroups.com</a>&gt;=
;
 Chris Shen &lt;<a href=3D"mailto:shenyiwen7@gmail.com" target=3D"_blank">s=
henyiwen7@gmail.com</a>&gt;; Mr. Jaehoon Paul Jeong &lt;<a href=3D"mailto:j=
aehoon.paul@gmail.com" target=3D"_blank">jaehoon.paul@gmail.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Subject:</span></b> Re: [ipwave] Intdir=
 last call review of draft-ietf-ipwave-vehicular-networking-20<u></u><u></u=
></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Hi Pascal,<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Here is the revision (-21) of IPWAVE PS Draft:<u></u><u></u></=
span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-ip=
wave-vehicular-networking-21" target=3D"_blank">https://datatracker.ietf.or=
g/doc/html/draft-ietf-ipwave-vehicular-networking-21</a><u></u><u></u></spa=
n></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">I attach the revision letter to show how I have addressed your=
 comments on the revision.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Chris and I have worked for this revision together.<u></u><u><=
/u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">If you have further comments, please let me know.<u></u><u></u=
></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Thanks.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Best Regards,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Paul<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert via Datatracker=
 &lt;<a href=3D"mailto:noreply@ietf.org" target=3D"_blank">noreply@ietf.org=
</a>&gt;
 wrote:<u></u><u></u></span></font></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0c=
m 5pt 4.8pt">
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Reviewer: Pascal Thubert<br>
Review result: Not Ready<br>
<br>
Dear authors<br>
<br>
In summary:<br>
<br>
I read a number of very good drafts collated in one, from the use cases tha=
t<br>
very complete and ready to publish, to the architecture and protocol soluti=
on<br>
in section 4 that would require more work for completeness.<br>
<br>
There are multiple instances in the use cases where protocols are listed co=
ming<br>
out of the blue, e.g., the references to OMNI that seem artificially spread=
<br>
regardless of the context of the section. OMNI is used throughout, both as =
an<br>
open ended toolbox, and as a carpet under which all problems can be hidden.=
<br>
<br>
Reading this doc, OMNI shows as an interface to a software mobile router, w=
ith<br>
multiple of the device physical interfaces connected to the mobile router. =
This<br>
makes the stack very simple as the complexity moves to the router. But now =
you<br>
have to implement the router. Presented as that, the OMNI router deserves i=
ts<br>
name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANET (=
many to<br>
choose from) and NEMO (and all the MIP protocol family across address<br>
families), all the possible radio interfaces on which the ND problems go aw=
ay<br>
by magic, and whatever else you want to put in there. Is that the intention=
?<br>
<br>
Instead of referring to OMNI for virtually anything, the doc should refer t=
o<br>
MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),<br>
draft-nordmark-intarea-ippl for split subnets, and<br>
draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet models.=
 And<br>
then you can say that all those components can be plugged in the OMNI route=
r,<br>
and you can discuss which MANET and which MIP you want, including using OMN=
I=E2=80=99s<br>
built in mobility.<br>
<br>
Note that my objections are not against the OMNI design, it might be the<br=
>
perfect thing and I am already aware of use cases that could be served by a=
<br>
P2MP interface like OMNI in conjunction with RFC8505 on the P2P subinterfac=
es<br>
(recycling the high level design we=E2=80=99ve been shipping for IPv4 / fra=
me relay for<br>
the last 30 years). My objection is of the way the draft uses [OMNI] as the=
<br>
magic wand that solves all the problems when what you really do is throw th=
em<br>
over the fence. I=E2=80=99d rather you focus on problems and use cases, for=
 which<br>
there=E2=80=99s excellent text, and indicate what needs to be done without =
making<br>
assumption on how the needful things will be solved.<br>
<br>
In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to spl=
it, keep all<br>
that=E2=80=99s use case and problem description and ship it, remove referen=
ces to<br>
protocols envisioned in the solution, and start the work on architecture of=
 the<br>
solution and the protocol applicability statements separately. An alternate=
<br>
would be to centralize the discussion on protocols to annex, and explain th=
at<br>
protocol A or B could be envisioned in solution space because to over this =
gap<br>
or implement that function.<br>
<br>
In any fashion, the current text is not ready for publication as applicabil=
ity<br>
statement, architecture and or/solution, so the related work should be remo=
ved<br>
from the main text. But I find it mostly ready for use case and problem<br>
statement, more below.<br>
<br>
Review:<br>
<br>
Abstract<br>
<br>
=C2=A0 =C2=A0This document discusses the problem statement and use cases of=
<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for Intelligent Transportation=
<br>
=C2=A0 =C2=A0Systems (ITS).<br>
<br>
&gt;&gt;&gt; The document goes beyond that; there was actually a thread at =
6MAN where<br>
Bob Hinden said =E2=80=9C This document says it is a problem statement, but=
 then<br>
becomes a solution document.=C2=A0 =C2=A0Might be better to cut it down to =
only the<br>
problem statement part. =E2=80=9C &gt;&gt;&gt; Would you consider doing thi=
s? If not, why? Note:<br>
you may want to respond on 6MAN as well. &gt;&gt;&gt; &gt;&gt;&gt;I would h=
ave thought that the<br>
traditional steps of problem statement and applicability statement of exist=
ing<br>
work could be expected from IPWAVE too. &gt;&gt;&gt; Please clarify the ste=
ps that you<br>
intend to follow next with this work.<br>
<br>
&lt;snip&gt;<br>
<br>
1.=C2=A0 Introduction<br>
<br>
&gt;&gt;&gt; Very readable and informative section, many thanks!<br>
<br>
=C2=A0 =C2=A0Along with these WAVE standards and C-V2X standards, regardles=
s of a<br>
=C2=A0 =C2=A0wireless access technology under the IP stack of a vehicle, ve=
hicular<br>
=C2=A0 =C2=A0networks can operate IP mobility with IPv6 [RFC8200] and Mobil=
e IPv6<br>
=C2=A0 =C2=A0protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (P=
MIPv6)<br>
=C2=A0 =C2=A0[RFC5213], Distributed Mobility Management (DMM) [RFC7333], Lo=
cator/<br>
=C2=A0 =C2=A0ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Ext=
ended<br>
=C2=A0 =C2=A0Route Optimization (AERO) [RFC6706BIS]).<br>
<br>
&gt;&gt;&gt; NEMO (RFC 3963) is not cited. Any reason why the vehicle would=
 not<br>
transport a network?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0This document describes use cases and a problem statement abou=
t<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for ITS, which is named IPv6 W=
ireless<br>
=C2=A0 =C2=A0Access in Vehicular Environments (IPWAVE).=C2=A0 First, it int=
roduces the<br>
=C2=A0 =C2=A0use cases for using V2V, V2I, and V2X networking in ITS.=C2=A0=
 Next, for<br>
=C2=A0 =C2=A0IPv6-based vehicular networks, it makes a gap analysis of curr=
ent<br>
=C2=A0 =C2=A0IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Manage=
ment,<br>
=C2=A0 =C2=A0and Security &amp; Privacy), and then enumerates requirements =
for the<br>
=C2=A0 =C2=A0extensions of those IPv6 protocols, which are tailored to IPv6=
-based<br>
=C2=A0 =C2=A0vehicular networking.=C2=A0 Thus, this document is intended to=
 motivate<br>
=C2=A0 =C2=A0development of key protocols for IPWAVE.<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
2.=C2=A0 Terminology<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0o=C2=A0 IP-OBU: &quot;Internet Protocol On-Board Unit&quot;: A=
n IP-OBU denotes a<br>
=C2=A0 =C2=A0 =C2=A0 computer situated in a vehicle (e.g., car, bicycle, au=
tobike,<br>
=C2=A0 =C2=A0 =C2=A0 motor cycle, and a similar one) and a device (e.g., sm=
artphone and<br>
=C2=A0 =C2=A0 =C2=A0 IoT device).=C2=A0 It has at least one IP interface th=
at runs in IEEE<br>
=C2=A0 =C2=A0 =C2=A0 802.11-OCB and has an &quot;OBU&quot; transceiver.=C2=
=A0 Also, it may have an IP<br>
=C2=A0 =C2=A0 =C2=A0 interface that runs in Cellular V2X (C-V2X) [TS-23.285=
-3GPP]<br>
=C2=A0 =C2=A0 =C2=A0 [TR-22.886-3GPP][TS-23.287-3GPP].=C2=A0 See the defini=
tion of the term<br>
=C2=A0 =C2=A0 =C2=A0 &quot;OBU&quot; in [RFC8691].<br>
<br>
&gt;&gt;&gt; Can that be a router connecting multiple computers?<br>
<br>
&lt;snip&gt;<br>
<br>
3.=C2=A0 Use Cases<br>
<br>
&gt;&gt;&gt; This is another great read and an enlightening section. Maybe =
mention in<br>
the abstract that the doc also covers use cases?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Although a Layer-2 solution can provide a support for multihop=
<br>
=C2=A0 =C2=A0communications in vehicular networks, the scalability issue re=
lated<br>
=C2=A0 =C2=A0to multihop forwarding still remains when vehicles need to<br>
=C2=A0 =C2=A0disseminate or forward packets toward multihop-away destinatio=
ns.=C2=A0 In<br>
=C2=A0 =C2=A0addition, the IPv6-based approach for V2V as a network layer p=
rotocol<br>
=C2=A0 =C2=A0can accommodate multiple radio technologies as MAC protocols, =
such as<br>
=C2=A0 =C2=A05G V2X and DSRC.=C2=A0 Therefore, the existing IPv6 protocol c=
an be<br>
=C2=A0 =C2=A0augmented through the addition of an Overlay Multilink Network=
 (OMNI)<br>
=C2=A0 =C2=A0Interface [OMNI] and/or protocol changes in order to support b=
oth<br>
=C2=A0 =C2=A0wireless single-hop/multihop V2V communications and multiple r=
adio<br>
=C2=A0 =C2=A0technologies in vehicular networks.=C2=A0 In such a way, vehic=
les can<br>
=C2=A0 =C2=A0communicate with each other by V2V communications to share eit=
her an<br>
=C2=A0 =C2=A0emergency situation or road hazard in a highway having multipl=
e kinds<br>
=C2=A0 =C2=A0of radio technologies, such as 5G V2X and DSRC.<br>
<br>
&gt;&gt;&gt; This text appears in the middle of high level use case, with a=
 crude list<br>
of protocols; this is not a place for it<br>
<br>
&gt;&gt;&gt; On a 6MAN Thread, Brian Carpenter said that the above:<br>
=E2=80=9C<br>
is of concern regardless of the mention of OMNI. Does it mean &quot;can be&=
quot; or<br>
&quot;needs to be&quot;? This paragraph seems like a very short summary of =
a big problem<br>
area. At the end of page 13 there is some related discussion, which mention=
s<br>
RPL as part of the solution (good choice, IMHO) but again seems to depend o=
n<br>
OMNI. I don&#39;t think the fix of simply removing references to OMNI works=
,<br>
because it would leave a gap. In an informational document, that is not a<b=
r>
formal problem but as far as this draft describes architecture, I don&#39;t=
 think<br>
that big a gap is reasonable. &quot;OMNI&quot; is mentioned more than 20 ti=
mes in the<br>
document. There are also several references to AERO, which is strongly<br>
associated with OMNI. =E2=80=9C &gt;&gt;&gt; I agree with Brian. Here the d=
ocument seems to be<br>
mixing solution with problem and putting the cart before the horse. My<br>
recommendation is to stick to what needs to be done that IPv6 does not do y=
et<br>
-the reqs and gaps-; but the doc should not step in the how things will be =
done<br>
unless the group already decided to do it. The logical next steps to a PS a=
re<br>
an applicability statement of existing work, and if the gaps cannot be fill=
ed,<br>
there may be one or more WG chartered to fill those gaps.<br>
<br>
&gt;&gt;&gt; I=E2=80=99d still be happy to see an annex with leads on where=
 the solution might<br>
come from like RFC 8691 does.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2I communications in a highway where RSUs a=
re<br>
=C2=A0 =C2=A0sparsely deployed, so a vehicle can reach the wireless coverag=
e of an<br>
=C2=A0 =C2=A0RSU through the multihop data forwarding of intermediate vehic=
les.<br>
=C2=A0 =C2=A0Thus, IPv6 needs to be extended for multihop V2I communication=
s.<br>
<br>
&gt;&gt;&gt; Note that I have no clue on how well OMNI applies in that spac=
e, maybe it<br>
does very well; but here it comes out of the blue with no justification. If=
 you<br>
mention OMNI you need to detail what it is and which of the V2V=C2=A0 probl=
ems you<br>
expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2X (or V2I2X) communications in an urban ro=
ad<br>
=C2=A0 =C2=A0network where RSUs are deployed at intersections, so a vehicle=
 (or a<br>
=C2=A0 =C2=A0pedestrian&#39;s smartphone) can reach the wireless coverage o=
f an RSU<br>
=C2=A0 =C2=A0through the multihop data forwarding of intermediate vehicles =
(or<br>
=C2=A0 =C2=A0pedestrians&#39; smartphones).=C2=A0 Thus, IPv6 needs to be ex=
tended for<br>
=C2=A0 =C2=A0multihop V2X (or V2I2X) communications.<br>
<br>
&gt;&gt;&gt; Please be more specific on what the missing functions are and =
whether they<br>
are missing from the stack development standpoint or if there=E2=80=99s wor=
k needed<br>
from the IETF. 1)=C2=A0 =C2=A0 =C2=A0 If something is really missing in our=
 specs, the text to<br>
prove from the use case above is missing 2)=C2=A0 =C2=A0 =C2=A0 how OMNI se=
rves the use case<br>
could be elaborated in an applicability statement of OMNI for V2xyz, but it=
 is<br>
a bit blunt to present it as panacea when the problems to be solved are not=
<br>
listed. 3)=C2=A0 =C2=A0 =C2=A0 If you look at it, OMNI seems like a softwar=
e mobile router<br>
within a bump in the stack. Can that become too big?<br>
<br>
&gt;&gt;&gt; my view is that the text above and the similar occasions shoul=
d be replaced<br>
by something like :<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented to provide the fo=
llowing<br>
=C2=A0 =C2=A0functions: 1) =E2=80=A6<br>
<br>
&gt;&gt;&gt; and / or something like:<br>
<br>
=C2=A0 =C2=A0In addition to the IPv6 node requirements [RFC 8504], the IPv6=
 protocol<br>
=C2=A0 =C2=A0stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=
=A6<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To support applications of these V2X use cases, the functions =
of IPv6<br>
=C2=A0 =C2=A0such as VND, VMM, and VSP are prerequisites for IPv6-based pac=
ket<br>
=C2=A0 =C2=A0exchange, transport-layer session continuity, and secure, safe=
<br>
=C2=A0 =C2=A0communication between a vehicle and a pedestrian either direct=
ly or<br>
=C2=A0 =C2=A0indirectly via an IP-RSU.<br>
<br>
&gt;&gt;&gt; =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=
=9D does not parse. There=E2=80=99s<br>
no IPv6 reference that provides those functions. If the intention is to say=
<br>
that there=E2=80=99s stuff to add to IPv6 to support, like, say,=C2=A0 VND,=
 then this<br>
document fails to define how an IPv6 VND should behave, though it=E2=80=99s=
 precisely<br>
what I=E2=80=99d expect from a problem statement.<br>
<br>
&lt;snip&gt;<br>
<br>
4.=C2=A0 Vehicular Networks<br>
<br>
&gt;&gt;&gt; What is the purpose of section 4 as a whole, problem statement=
 or<br>
applicability statement of the listed protocols? In the former case what=E2=
=80=99s the<br>
problem? In the latter case it is incomplete and needs to be exported to an=
<br>
applicability statement doc with all the possible technologies evaluated.<b=
r>
<br>
=C2=A0 =C2=A0This section describes an example vehicular network architectu=
re<br>
=C2=A0 =C2=A0supporting V2V, V2I, and V2X communications in vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt; I read this as presenting a context to explain what the proble=
ms are<br>
instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe usin=
g the term<br>
=E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=99s =
comment.<br>
<br>
&lt;snip&gt;<br>
<br>
4.1.=C2=A0 Vehicular Network Architecture<br>
<br>
=C2=A0 =C2=A0Figure 1 shows an example vehicular network architecture for V=
2I and<br>
=C2=A0 =C2=A0V2V in a road network [OMNI].<br>
<br>
a.=C2=A0 =C2=A0 =C2=A0 Is using OMNI a decision that the WG made for the fu=
ture work ? what<br>
does it do and what does it not do? b.=C2=A0 =C2=A0 =C2=A0 Is there work le=
ft to be done? Who<br>
will do that work? Or is it the expectation that OMNI has it all defined<br=
>
already?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An existing network architecture (e.g., an IP-based aeronautic=
al<br>
=C2=A0 =C2=A0network architecture [OMNI][UAM-ITS], a network architecture o=
f<br>
=C2=A0 =C2=A0PMIPv6 [RFC5213], and a low-power and lossy network architectu=
re<br>
=C2=A0 =C2=A0[RFC6550]) can be extended to a vehicular network architecture=
 for<br>
=C2=A0 =C2=A0multihop V2V, V2I, and V2X, as shown in Figure 1.=C2=A0 In a h=
ighway<br>
=C2=A0 =C2=A0scenario, a vehicle may not access an RSU directly because of =
the<br>
=C2=A0 =C2=A0distance of the DSRC coverage (up to 1 km).=C2=A0 For example,=
 the OMNI<br>
=C2=A0 =C2=A0interface and/or RPL (IPv6 Routing Protocol for Low-Power and =
Lossy<br>
=C2=A0 =C2=A0Networks) [RFC6550] can be extended to support a multihop V2I =
since a<br>
=C2=A0 =C2=A0vehicle can take advantage of other vehicles as relay nodes to=
 reach<br>
=C2=A0 =C2=A0the RSU.=C2=A0 Also, RPL can be extended to support both multi=
hop V2V and<br>
=C2=A0 =C2=A0V2X in the similar way.<br>
<br>
&gt;&gt;&gt; all this could fit well in annex; anyway you need to explain w=
hat you<br>
expect the protocols to do and which extension is needed. In the case of RP=
L at<br>
least you indicate that it would do routing, but not why you cannot use it =
of<br>
the shelf; for OMNI, what you expect is less clear, though there=E2=80=99s =
text<br>
elsewhere about the many radio interfaces that could be used for the purpos=
e,<br>
and the text in the UAM below that is enlightening.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 To support not only the mobil=
ity<br>
=C2=A0 =C2=A0management of the UAM end systems, but also the multihop and<b=
r>
=C2=A0 =C2=A0multilink communications of the UAM interfaces, the UAM end sy=
stems<br>
=C2=A0 =C2=A0can employ an Overlay Multilink Network (OMNI) interface [OMNI=
] as a<br>
=C2=A0 =C2=A0virtual Non-Broadcast Multiple Access (NBMA) connection to a s=
erving<br>
=C2=A0 =C2=A0ground domain infrastructure.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; when connecting to a MANET it needs support for that MANET. The t=
ext<br>
above seems to imply that is solves everything in V2xyz like magic; reminds=
 me<br>
of the IPv6 multicast abstraction that was supposed to solve the broadcast<=
br>
problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 This infrastructure can be configured<br>
=C2=A0 =C2=A0over the underlying data links.=C2=A0 The OMNI interface and i=
ts link<br>
=C2=A0 =C2=A0model provide a means of multilink, multihop and mobility<br>
=C2=A0 =C2=A0coordination to the legacy IPv6 ND messaging [RFC4861] accordi=
ng to<br>
=C2=A0 =C2=A0the NBMA principle.=C2=A0 Thus, the OMNI link model can suppor=
t efficient<br>
=C2=A0 =C2=A0UAM internetworking services without additional mobility messa=
ging,<br>
=C2=A0 =C2=A0and without any modification to the IPv6 ND messaging services=
 or<br>
=C2=A0 =C2=A0link model.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; the text above seems to imply that is solves everything in V2xyz =
like<br>
magic; that would be a stretch, that reminds me of IPv6 multicast that was<=
br>
supposed to solve the broadcast problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Multiple vehicles under the coverage of an RSU share a prefix =
just as<br>
=C2=A0 =C2=A0mobile nodes share a prefix of a Wi-Fi access point in a wirel=
ess<br>
=C2=A0 =C2=A0LAN.=C2=A0 This is a natural characteristic in infrastructure-=
based<br>
=C2=A0 =C2=A0wireless networks.=C2=A0 For example, in Figure 1, two vehicle=
s (i.e.,<br>
=C2=A0 =C2=A0Vehicle2, and Vehicle5) can use Prefix 1 to configure their IP=
v6<br>
=C2=A0 =C2=A0global addresses for V2I communication.=C2=A0 Alternatively, m=
obile nodes<br>
=C2=A0 =C2=A0can employ an OMNI interface and use their own IPv6 Unique Loc=
al<br>
=C2=A0 =C2=A0Addresses (ULAs) [RFC4193] over the wireless network without<b=
r>
=C2=A0 =C2=A0requiring the messaging of IPv6 Stateless Address Autoconfigur=
ation<br>
=C2=A0 (SLAAC) [RFC4862], which uses an on-link prefix provided by the<br>
=C2=A0 =C2=A0(visited) wireless LAN; this technique is known as &quot;Bring=
-Your-Own-<br>
=C2=A0 =C2=A0Addresses&quot;.<br>
<br>
&gt;&gt;&gt;=C2=A0 Is OMNI the only way to &quot;Bring-Your-Own-Addresses=
=E2=80=9D? Else the text could be<br>
more generic, at least use e.g., like the ref to AERO later. &gt;&gt;&gt; W=
hat are the<br>
implications / limitations of doing that =E2=80=93 like they can do line of=
 sight V2V<br>
but not reach the internet, or the need of=C2=A0 a local MANET / RPL that w=
ill<br>
accept to route those addresses, or the security / address ownership valida=
tion<br>
issues ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0A single subnet prefix announced by an RSU can span multiple v=
ehicles<br>
=C2=A0 =C2=A0in VANET.=C2=A0 For example, in Figure 1, for Prefix 1, three =
vehicles<br>
=C2=A0 =C2=A0(i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a conne=
cted<br>
=C2=A0 =C2=A0VANET.=C2=A0 Also, for Prefix 2, two vehicles (i.e., Vehicle3 =
and<br>
=C2=A0 =C2=A0Vehicle6) can construct another connected VANET, and for Prefi=
x 3,<br>
=C2=A0 =C2=A0two vehicles (i.e., Vehicle4 and Vehicle7) can construct anoth=
er<br>
=C2=A0 =C2=A0connected VANET.=C2=A0 Alternatively, each vehicle could emplo=
y an OMNI<br>
=C2=A0 =C2=A0interface with their own ULAs such that no topologically-orien=
ted<br>
=C2=A0 =C2=A0subnet prefixes need be announced by the RSU.<br>
<br>
&gt;&gt;&gt;=C2=A0 same as above. This seems to restate the same thing, der=
ive an address<br>
from a topologically correct prefix or use your own with limitations to be<=
br>
described.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]<b=
r>
=C2=A0 =C2=A0specifies several details, including Maximum Transmission Unit=
 (MTU),<br>
=C2=A0 =C2=A0frame format, link-local address, address mapping for unicast =
and<br>
=C2=A0 =C2=A0multicast, stateless autoconfiguration, and subnet structure.=
=C2=A0 An<br>
=C2=A0 =C2=A0Ethernet Adaptation (EA) layer is in charge of transforming so=
me<br>
=C2=A0 =C2=A0parameters between the IEEE 802.11 MAC layer and the IPv6 netw=
ork<br>
=C2=A0 =C2=A0layer, which is located between the IEEE 802.11-OCB&#39;s logi=
cal link<br>
=C2=A0 =C2=A0control layer and the IPv6 network layer.=C2=A0 This IPv6 over=
 802.11-OCB<br>
=C2=A0 =C2=A0can be used for both V2V and V2I in IPv6-based vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt;=C2=A0 solution space.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An IPv6 mobility solution is needed for the guarantee of<br>
=C2=A0 =C2=A0communication continuity in vehicular networks so that a vehic=
le&#39;s<br>
=C2=A0 =C2=A0TCP session can be continued, or UDP packets can be delivered =
to a<br>
=C2=A0 =C2=A0vehicle as a destination without loss while it moves from an I=
P-RSU&#39;s<br>
=C2=A0 =C2=A0wireless coverage to another IP-RSU&#39;s wireless coverage.=
=C2=A0 In<br>
=C2=A0 =C2=A0Figure 1, assuming that Vehicle2 has a TCP session (or a UDP s=
ession)<br>
=C2=A0 =C2=A0with a corresponding node in the vehicular cloud, Vehicle2 can=
 move<br>
=C2=A0 =C2=A0from IP-RSU1&#39;s wireless coverage to IP-RSU2&#39;s wireless=
 coverage.=C2=A0 In<br>
=C2=A0 =C2=A0this case, a handover for Vehicle2 needs to be performed by ei=
ther a<br>
=C2=A0 =C2=A0host-based mobility management scheme (e.g., MIPv6 [RFC6275]) =
or a<br>
=C2=A0 =C2=A0network-based mobility management scheme (e.g., PMIPv6 [RFC521=
3] and<br>
=C2=A0 =C2=A0AERO [RFC6706BIS]).<br>
<br>
=C2=A0 =C2=A0In the host-based mobility scheme (e.g., MIPv6), an IP-RSU pla=
ys a<br>
=C2=A0 =C2=A0role of a home agent.=C2=A0 On the other hand, in the network-=
based<br>
=C2=A0 =C2=A0mobility scheme (e.g., PMIPv6, an MA plays a role of a mobilit=
y<br>
=C2=A0 =C2=A0management controller such as a Local Mobility Anchor (LMA) in=
<br>
=C2=A0 =C2=A0PMIPv6, which also serves vehicles as a home agent, and an IP-=
RSU<br>
=C2=A0 =C2=A0plays a role of an access router such as a Mobile Access Gatew=
ay<br>
=C2=A0 =C2=A0(MAG) in PMIPv6 [RFC5213].=C2=A0 The host-based mobility schem=
e needs<br>
=C2=A0 =C2=A0client functionality in IPv6 stack of a vehicle as a mobile no=
de for<br>
=C2=A0 =C2=A0mobility signaling message exchange between the vehicle and ho=
me<br>
=C2=A0 =C2=A0agent.=C2=A0 On the other hand, the network-based mobility sch=
eme does not<br>
=C2=A0 =C2=A0need such a client functionality for a vehicle because the net=
work<br>
=C2=A0 =C2=A0infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility =
agent<br>
=C2=A0 =C2=A0handles the mobility signaling message exchange with the home =
agent<br>
=C2=A0 =C2=A0(e.g., LMA in PMIPv6) for the sake of the vehicle.<br>
<br>
=C2=A0 =C2=A0There are a scalability issue and a route optimization issue i=
n the<br>
=C2=A0 =C2=A0network-based mobility scheme (e.g., PMIPv6) when an MA covers=
 a<br>
=C2=A0 =C2=A0large vehicular network governing many IP-RSUs.=C2=A0 In this =
case, a<br>
=C2=A0 =C2=A0distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate=
 the<br>
=C2=A0 =C2=A0scalability issue by distributing multiple MAs in the vehicula=
r<br>
=C2=A0 =C2=A0network such that they are positioned closer to vehicles for r=
oute<br>
=C2=A0 =C2=A0optimization and bottleneck mitigation in a central MA in the<=
br>
=C2=A0 =C2=A0network-based mobility scheme.=C2=A0 All these mobility approa=
ches (i.e.,<br>
=C2=A0 =C2=A0a host-based mobility scheme, network-based mobility scheme, a=
nd<br>
=C2=A0 =C2=A0distributed mobility scheme) and a hybrid approach of a combin=
ation<br>
=C2=A0 =C2=A0of them need to provide an efficient mobility service to vehic=
les<br>
=C2=A0 =C2=A0moving fast and moving along with the relatively predictable<b=
r>
=C2=A0 =C2=A0trajectories along the roadways.<br>
<br>
=C2=A0 =C2=A0In vehicular networks, the control plane can be separated from=
 the<br>
=C2=A0 =C2=A0data plane for efficient mobility management and data forwardi=
ng by<br>
=C2=A0 =C2=A0using the concept of Software-Defined Networking (SDN)<br>
=C2=A0 =C2=A0[RFC7149][DMM-FPC].=C2=A0 Note that Forwarding Policy Configur=
ation (FPC)<br>
=C2=A0 =C2=A0in [DMM-FPC], which is a flexible mobility management system, =
can<br>
=C2=A0 =C2=A0manage the separation of data-plane and control-plane in DMM.=
=C2=A0 In<br>
=C2=A0 =C2=A0SDN, the control plane and data plane are separated for the ef=
ficient<br>
=C2=A0 =C2=A0management of forwarding elements (e.g., switches and routers)=
 where<br>
=C2=A0 =C2=A0an SDN controller configures the forwarding elements in a cent=
ralized<br>
=C2=A0 =C2=A0way and they perform packet forwarding according to their forw=
arding<br>
=C2=A0 =C2=A0tables that are configured by the SDN controller.=C2=A0 An MA =
as an SDN<br>
=C2=A0 =C2=A0controller needs to efficiently configure and monitor its IP-R=
SUs and<br>
=C2=A0 =C2=A0vehicles for mobility management, location management, and sec=
urity<br>
=C2=A0 =C2=A0services.<br>
<br>
=C2=A0 =C2=A0The mobility information of a GPS receiver mounted in its vehi=
cle<br>
=C2=A0 =C2=A0(e.g., position, speed, and direction) can be used to accommod=
ate<br>
=C2=A0 =C2=A0mobility-aware proactive handover schemes, which can perform t=
he<br>
=C2=A0 =C2=A0handover of a vehicle according to its mobility and the wirele=
ss<br>
=C2=A0 =C2=A0signal strength of a vehicle and an IP-RSU in a proactive way.=
<br>
<br>
=C2=A0 =C2=A0Vehicles can use the TCC as their Home Network having a home a=
gent<br>
=C2=A0 =C2=A0for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5=
213],<br>
=C2=A0 =C2=A0so the TCC (or an MA inside the TCC) maintains the mobility<br=
>
=C2=A0 =C2=A0information of vehicles for location management.=C2=A0 IP tunn=
eling over<br>
=C2=A0 =C2=A0the wireless link should be avoided for performance efficiency=
.<br>
=C2=A0 =C2=A0Also, in vehicular networks, asymmetric links sometimes exist =
and<br>
=C2=A0 =C2=A0must be considered for wireless communications such as V2V and=
 V2I.<br>
<br>
&gt;&gt;&gt;=C2=A0 This is all very informative text but does not state a p=
roblem. Is there a<br>
problem is left to be solved or are we assessing the applicability of<br>
protocols? Could it for instance, forward point to issues discussed in sect=
ion<br>
5?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, as internal networks, a vehicle&#39;s mo=
ving<br>
=C2=A0 =C2=A0network and an EN&#39;s fixed network are self-contained netwo=
rks having<br>
=C2=A0 =C2=A0multiple subnets and having an edge router (e.g., IP-OBU and I=
P-RSU)<br>
=C2=A0 =C2=A0for the communication with another vehicle or another EN.=C2=
=A0 The<br>
=C2=A0 =C2=A0internetworking between two internal networks via V2I communic=
ation<br>
=C2=A0 =C2=A0requires the exchange of the network parameters and the networ=
k<br>
=C2=A0 =C2=A0prefixes of the internal networks.=C2=A0 For the efficiency, t=
he network<br>
=C2=A0 =C2=A0prefixes of the internal networks (as a moving network) in a v=
ehicle<br>
=C2=A0 =C2=A0need to be delegated and configured automatically.=C2=A0 Note =
that a<br>
=C2=A0 =C2=A0moving network&#39;s network prefix can be called a Mobile Net=
work Prefix<br>
=C2=A0 =C2=A0(MNP) [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. MNP is originally =
defined here<br>
<a href=3D"https://datatracker.ietf.org/doc/html/rfc3963#section-2" target=
=3D"_blank">https://datatracker.ietf.org/doc/html/rfc3963#section-2</a> and=
 that=E2=80=99s a reference<br>
you can use normatively.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, the addresses used for IPv6 transmission=
s over<br>
=C2=A0 =C2=A0the wireless link interfaces for IP-OBU and IP-RSU can be eith=
er<br>
=C2=A0 =C2=A0global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets ca=
n be<br>
=C2=A0 =C2=A0routed within vehicular networks [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. There needs to=C2=
=A0 be a routing protocol<br>
like a MANET that will accept to carry the<br>
=C2=A0MNPs, and that must be implemented by the infra and both cars. The OM=
NI spec<br>
=C2=A0is clear on that. This is why at first glance I see OMNI as a full mo=
bile<br>
=C2=A0router in a bump in the stack. Now what is the problem behind this? N=
o such<br>
=C2=A0protocol at IETF? Too many to choose from? No deployment?<br>
&lt;snip&gt;<br>
<br>
When global IPv6 addresses<br>
=C2=A0 =C2=A0are used, wireless interface configuration and control overhea=
d for<br>
=C2=A0 =C2=A0Duplicate Address Detection (DAD) [RFC4862] and Multicast List=
ener<br>
=C2=A0 =C2=A0Discovery (MLD) [RFC2710][RFC3810] should be minimized to supp=
ort V2I<br>
=C2=A0 =C2=A0and V2X communications for vehicles moving fast along roadways=
; when<br>
=C2=A0 =C2=A0ULAs and the OMNI interface are used, no DAD nor MLD messaging=
 is<br>
=C2=A0 =C2=A0needed.<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it t=
he no dad needed a property<br>
of injecting a BYOA in the fabric for an GUA MIP Home Address which is know=
n to<br>
be unique at home? &gt;&gt;&gt; OTOH, autoconf=E2=80=99ing a random ULA =E2=
=80=9CFD=E2=80=A6=E2=80=9Dprefix has lesser<br>
DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classical =
subnet. So<br>
who says DAD isn=E2=80=99t required for OMNI ULA? &gt;&gt;&gt; note that IM=
HO DAD on wireless is<br>
a lot more harm than good, and I agree that with a good pseudo random gener=
ator<br>
the ULA has no chance to collision in the real world, as OMNI claims. It=E2=
=80=99s just<br>
that your argument here plays the other way, because there are less random =
bits<br>
(56)=C2=A0 in the ULA prefix than in the IID (62), and if one starts using =
more<br>
prefix bits to be non-random, there will be a time when DAD on prefix is ne=
eded.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Let us consider the upload/download time of a vehicle when it =
passes<br>
=C2=A0 =C2=A0through the wireless communication coverage of an IP-RSU.=C2=
=A0 For a<br>
=C2=A0 =C2=A0given typical setting where 1km is the maximum DSRC communicat=
ion<br>
=C2=A0 =C2=A0range [DSRC] and 100km/h is the speed limit in highway, the dw=
elling<br>
=C2=A0 =C2=A0time can be calculated to be 72 seconds by dividing the diamet=
er of<br>
=C2=A0 =C2=A0the 2km (i.e., two times of DSRC communication range where an =
IP-RSU<br>
=C2=A0 =C2=A0is located in the center of the circle of wireless communicati=
on) by<br>
=C2=A0 =C2=A0the speed limit of 100km/h (i.e., about 28m/s).=C2=A0 For the =
72 seconds,<br>
=C2=A0 =C2=A0a vehicle passing through the coverage of an IP-RSU can upload=
 and<br>
=C2=A0 =C2=A0download data packets to/from the IP-RSU.<br>
<br>
&lt;snip&gt;<br>
<br>
4.3.=C2=A0 V2V-based Internetworking<br>
<br>
&gt;&gt;&gt; In this section it looks like the cars are in a stable line of=
 sight<br>
relationship. Which is probably fine for a platoon, but when you drive alon=
g<br>
with friends in different cars, you realize that the line of sight assumpti=
on<br>
does not stand over time. Soon enough, other cars meddle in, and possibly o=
ne<br>
of the cars drives faster and too far ahead so you need the infra to relay,=
<br>
possibly over multiple infra hops.<br>
<br>
&gt;&gt;&gt; so in this section, I=E2=80=99d expect to see a Vehicle commun=
icating with another<br>
one and using either line of sight or V2V relaying but also using relay via=
 V2I<br>
(multihop I2I not just hub and spoke V2I2V ), alternatively to together for=
<br>
redundancy. Is that part of the problem?<br>
<br>
&gt;&gt;&gt; reading deeper section 5 I found excellent text on routing via=
 V and via I.<br>
This tells that section 4 does not play a good role at justifying section 5=
.<br>
Maybe keep section 4 for another doc?<br>
<br>
&gt;&gt;&gt; What kind or reliability is required in a V2V use case? Do you=
 think ND can<br>
handle it? Or MANET? What would be the assumption on L2 (roaming time, unic=
ast<br>
vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3 <br=
>
redundancy?<br>
<br>
&lt;snip&gt;<br>
<br>
5.=C2=A0 Problem Statement<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0In order to specify protocols using the architecture mentioned=
 in<br>
=C2=A0 =C2=A0Section 4.1, IPv6 core protocols have to be adapted to overcom=
e<br>
=C2=A0 =C2=A0certain challenging aspects of vehicular networking.=C2=A0 Sin=
ce the<br>
=C2=A0 =C2=A0vehicles are likely to be moving at great speed, protocol exch=
anges<br>
=C2=A0 =C2=A0need to be completed in a time relatively short compared to th=
e<br>
=C2=A0 =C2=A0lifetime of a link between a vehicle and an IP-RSU, or between=
 two<br>
=C2=A0 =C2=A0vehicles.<br>
<br>
&gt;&gt;&gt; Any order of magnitude?<br>
&gt;&gt;&gt; Can you indicate whether this already rules out certain proced=
ures, e.g.<br>
DAD ?<br>
<br>
=C2=A0 =C2=A0The lifetime of a session varies depending on the session&#39;=
s type such<br>
=C2=A0 =C2=A0as a web surfing, voice call over IP, and DNS query.=C2=A0 Reg=
ardless of a<br>
=C2=A0 =C2=A0session&#39;s type, to guide all the IPv6 packets to their des=
tination<br>
=C2=A0 =C2=A0host, IP mobility should be supported for the session.<br>
<br>
&gt;&gt;&gt; this seems to be for unicast when you know who to talk to. Is =
there a need<br>
some multicast groups like anybody around interested in topic blah like I c=
ould<br>
be multicasting the speed of vehicles coming the other way that I crossed<b=
r>
recently, for use of vehicles that I=E2=80=99m crossing now, so they can se=
e a slowdown<br>
on advance<br>
<br>
=C2=A0 =C2=A0Thus, the time constraint of a wireless link has a major impac=
t on<br>
=C2=A0 =C2=A0IPv6 Neighbor Discovery (ND).=C2=A0 Mobility Management (MM) i=
s also<br>
=C2=A0 =C2=A0vulnerable to disconnections that occur before the completion =
of<br>
=C2=A0 =C2=A0identity verification and tunnel management.=C2=A0 This is esp=
ecially true<br>
=C2=A0 =C2=A0given the unreliable nature of wireless communication.=C2=A0 T=
his section<br>
=C2=A0 =C2=A0presents key topics such as neighbor discovery and mobility<br=
>
=C2=A0 =C2=A0management.<br>
<br>
&gt;&gt;&gt; Only ND? What about the MANET?<br>
&gt;&gt;&gt; how fast should ND be to be suitable?<br>
&gt;&gt;&gt; is there also a bandwidth check? You can make things much fast=
er if you<br>
dedicate a lot of spectrum to it. But that can also be a waste.<br>
<br>
5.1.=C2=A0 Neighbor Discovery<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The requirements for IPv6 ND for vehicular networks are effici=
ent DAD<br>
=C2=A0 =C2=A0and NUD operations.<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 This merging and partitioning should be considered for=
 the<br>
=C2=A0 =C2=A0IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAA=
C)<br>
=C2=A0 =C2=A0[RFC4862].<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Also, the partitioning of a VANET may make vehicles with the s=
ame<br>
=C2=A0 =C2=A0prefix be physically unreachable.=C2=A0 Also, SLAAC needs to p=
revent IPv6<br>
=C2=A0 =C2=A0address duplication due to the merging of VANETs.=C2=A0 Accord=
ing to the<br>
=C2=A0 =C2=A0merging and partitioning, a destination vehicle (as an IPv6 ho=
st)<br>
=C2=A0 =C2=A0needs to be distinguished as either an on-link host or an off-=
link<br>
=C2=A0 =C2=A0host even though the source vehicle uses the same prefix as th=
e<br>
=C2=A0 =C2=A0destination vehicle.<br>
<br>
&gt;&gt;&gt; should reference to draft-nordmark-intarea-ippl<br>
<br>
=C2=A0 =C2=A0To efficiently prevent IPv6 address duplication due to the VAN=
ET<br>
=C2=A0 =C2=A0partitioning and merging from happening in vehicular networks,=
 the<br>
=C2=A0 =C2=A0vehicular networks need to support a vehicular-network-wide DA=
D by<br>
=C2=A0 =C2=A0defining a scope that is compatible with the legacy DAD.=C2=A0=
 In this<br>
=C2=A0 =C2=A0case, two vehicles can communicate with each other when there =
exists<br>
=C2=A0 =C2=A0a communication path over VANET or a combination of VANETs and=
 IP-<br>
=C2=A0 =C2=A0RSUs, as shown in Figure 1.=C2=A0 By using the vehicular-netwo=
rk-wide DAD,<br>
=C2=A0 =C2=A0vehicles can assure that their IPv6 addresses are unique in th=
e<br>
=C2=A0 =C2=A0vehicular network whenever they are connected to the vehicular=
<br>
=C2=A0 =C2=A0infrastructure or become disconnected from it in the form of V=
ANET.<br>
<br>
&gt;&gt;&gt; Excellent<br>
<br>
=C2=A0 =C2=A0ND time-related parameters such as router lifetime and Neighbo=
r<br>
=C2=A0 =C2=A0Advertisement (NA) interval need to be adjusted for vehicle sp=
eed and<br>
=C2=A0 =C2=A0vehicle density.=C2=A0 For example, the NA interval needs to b=
e<br>
=C2=A0 =C2=A0dynamically adjusted according to a vehicle&#39;s speed so tha=
t the<br>
=C2=A0 =C2=A0vehicle can maintain its neighboring vehicles in a stable way,=
<br>
=C2=A0 =C2=A0considering the collision probability with the NA messages sen=
t by<br>
=C2=A0 =C2=A0other vehicles.<br>
<br>
&gt;&gt;&gt; Is that a problem or just an operational setting that needs to=
 be found?<br>
&gt;&gt;&gt; Do we need to reconsider the concepts of those timers?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, IPv6 ND should have =
minimum<br>
=C2=A0 =C2=A0changes for the interoperability with the legacy IPv6 ND used =
in the<br>
=C2=A0 =C2=A0Internet, including the DAD and NUD operations.<br>
<br>
&gt;&gt;&gt; I do not find the logical link with the text before, why is th=
is a =E2=80=9Cthus=E2=80=9D?<br>
&gt;&gt;&gt; why should the ND inside the VANET be constrained to be intero=
perable? This<br>
may place constraints on the solution.<br>
<br>
5.1.1.=C2=A0 Link Model<br>
<br>
=C2=A0 =C2=A0A prefix model for a vehicular network needs to facilitate the=
<br>
<br>
&gt;&gt;&gt; Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=
=80=9Cprefix model=E2=80=9D.<br>
&gt;&gt;&gt; it would make this piece and the next should refer to<br>
draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both li=
nk<br>
and subnet issues. The general ideas are the same, but the gory details her=
e<br>
are slightly incorrect, like this notion of prefix model than comes out of =
the<br>
blue. The model is really the subnet model for the subnet associated to P2M=
P.<br>
<br>
=C2=A0 =C2=A0communication between two vehicles with the same prefix regard=
less of<br>
=C2=A0 =C2=A0the vehicular network topology as long as there exist bidirect=
ional<br>
=C2=A0 =C2=A0E2E paths between them in the vehicular network including VANE=
Ts and<br>
=C2=A0 =C2=A0IP-RSUs.=C2=A0 This prefix model allows vehicles with the same=
 prefix to<br>
=C2=A0 =C2=A0communicate with each other via a combination of multihop V2V =
and<br>
=C2=A0 =C2=A0multihop V2I with VANETs and IP-RSUs.=C2=A0 Note that the OMNI=
 interface<br>
=C2=A0 =C2=A0supports an NBMA link model where multihop V2V and V2I communi=
cations<br>
=C2=A0 =C2=A0use each mobile node&#39;s ULAs without need for any DAD or ML=
D<br>
=C2=A0 =C2=A0messaging.<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; I kinda agree about the OMNI interface model, nothing against =
that. But you<br>
must see that there needs a lot more than what the OMNI interface to get<br=
>
packets across V and I hops to the destination. Like routing ala MANET,<br>
redundancy handling ala DetNet because it will be very lossy, path manageme=
nt<br>
ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND so i=
t does not<br>
solve the ND problems above.<br>
<br>
=C2=A0 =C2=A0IPv6 protocols work under certain assumptions that do not nece=
ssarily<br>
=C2=A0 =C2=A0hold for vehicular wireless access link types other than OMNI/=
NBMA<br>
=C2=A0 =C2=A0[VIP-WAVE][RFC5889]; the rest of this section discusses implic=
ations<br>
=C2=A0 =C2=A0for those link types that do not apply when the OMNI/NBMA link=
 model<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; The keyword here is P2MP / NBMA, and OMNI is one interface tha=
t accepts<br>
that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already P2M=
P / NBMA,<br>
using routing to complete the partial mesh in P2MP. The text seems to imply=
<br>
that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI is=
 loaded with<br>
other stuff than a plain P2MP capable interface. And ND over P2MP is not do=
ne<br>
by OMNI, OMNI only makes classical ND worse and only works in a full mesh. =
OTOH<br>
RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work very =
well<br>
within an OMNI interface and solve those problems. &gt;&gt;&gt; My point is=
 that you<br>
need to tell the full story or refrain from entering solution space in this=
 doc<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0There is a relationship between a link and a prefix, besides t=
he<br>
=C2=A0 =C2=A0different scopes that are expected from the link-local and glo=
bal<br>
=C2=A0 =C2=A0types of IPv6 addresses.=C2=A0 In an IPv6 link, it is assumed =
that all<br>
=C2=A0 =C2=A0interfaces which are configured with the same subnet prefix an=
d with<br>
=C2=A0 =C2=A0on-link bit set can communicate with each other on an IPv6 lin=
k.<br>
<br>
&gt;&gt;&gt; not assumed; that=E2=80=99s what the onlink but set tells. The=
 conclusion should be<br>
that the VANET cannot set the O bit.<br>
<br>
=C2=A0 =C2=A0However, the vehicular link model needs to define the relation=
ship<br>
=C2=A0 =C2=A0between a link and a prefix, considering the dynamics of wirel=
ess<br>
=C2=A0 =C2=A0links and the characteristics of VANET.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0From the previous observation, a vehicular link model should c=
onsider<br>
=C2=A0 =C2=A0the frequent partitioning and merging of VANETs due to vehicle=
<br>
=C2=A0 =C2=A0mobility.=C2=A0 Therefore, the vehicular link model needs to u=
se an on-<br>
=C2=A0 =C2=A0link prefix and off-link prefix according to the network topol=
ogy of<br>
=C2=A0 =C2=A0vehicles such as a one-hop reachable network and a multihop re=
achable<br>
<br>
&gt;&gt;&gt; No, the once a node saw a O bit set that sticks even if it see=
s other<br>
advertisements of the PIO with the O bit not set. &gt;&gt;&gt; This is a gl=
obal and<br>
intrinsic property of the prefix (and an attack vector that could be mentio=
ned<br>
in the sec section). &gt;&gt;&gt; the VANET prefix must never come with the=
 O bit set.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0network (or partitioned networks).=C2=A0 If the vehicles with =
the same<br>
=C2=A0 =C2=A0prefix are reachable from each other in one hop, the prefix sh=
ould be<br>
=C2=A0 =C2=A0on-link.<br>
<br>
&gt;&gt;&gt;&gt; No, see above; but the router may redirect though it is re=
ally risky<br>
unless this is a stable situation like a parking place.<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, the vehicular link m=
odel<br>
=C2=A0 =C2=A0should have minimum changes for interoperability with standard=
 IPv6<br>
=C2=A0 =C2=A0links in an efficient fashion to support IPv6 DAD, MLD and NUD=
<br>
=C2=A0 =C2=A0operations.=C2=A0 When the OMNI NBMA link model is used, there=
 are no link<br>
=C2=A0 =C2=A0model changes nor DAD/MLD messaging required.<br>
<br>
&gt;&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt;&gt; You need a good P2MP subnet model with routing support whe=
n the mesh is<br>
partial. My company alone has been shipping million of nodes that build sub=
nets<br>
of thousands, and that was done using IETF standards.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For vehicular networks with high mobility and density, the DAD=
 needs<br>
=C2=A0 =C2=A0to be performed efficiently with minimum overhead so that the<=
br>
=C2=A0 =C2=A0vehicles can exchange a driving safety message (e.g., collisio=
n<br>
=C2=A0 =C2=A0avoidance and accident notification) with each other with a sh=
ort<br>
=C2=A0 =C2=A0interval (e.g., 0.5 second) by a technical report from NHTSA<b=
r>
=C2=A0 =C2=A0(National Highway Traffic Safety Administration) [NHTSA-ACAS-R=
eport].<br>
=C2=A0 =C2=A0Such a driving safety message may include a vehicle&#39;s mobi=
lity<br>
=C2=A0 =C2=A0information (i.e., position, speed, direction, and acceleratio=
n/<br>
=C2=A0 =C2=A0deceleration).=C2=A0 The exchange interval of this message is =
0.5 second,<br>
=C2=A0 =C2=A0which is required to allow a driver to avoid a rear-end crash =
from<br>
=C2=A0 =C2=A0another vehicle.<br>
<br>
&gt;&gt;&gt; IPv6 over broadcast MAC (used to be called internet 0, 10+ yea=
rs ago)<br>
solves that MAC issue since there is no MAC.<br>
<br>
5.1.3.=C2=A0 Routing<br>
<br>
=C2=A0 =C2=A0For multihop V2V communications in either a VANET or VANETs vi=
a IP-<br>
=C2=A0 =C2=A0RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing proto=
col may<br>
=C2=A0 =C2=A0be required to support both unicast and multicast in the links=
 of the<br>
=C2=A0 =C2=A0subnet with the same IPv6 prefix.=C2=A0 However, it will be co=
stly to run<br>
=C2=A0 =C2=A0both vehicular ND and a vehicular ad hoc routing protocol in t=
erms of<br>
=C2=A0 =C2=A0control traffic overhead [ID-Multicast-Problems].<br>
<br>
&gt;&gt;&gt; we do that with IETF standards on battery operated devices alr=
eady. Using<br>
RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve see=
n 30 hops in<br>
meshes of thousands in the real world though it=E2=80=99s not the normal op=
erational<br>
model, but can happen to maintain connectivity during the reboot of a root)=
 and<br>
does not use broadcast. RPL was initially designed as a V2V2V protocol but<=
br>
found its market on the IoT. I=E2=80=99m sure the protocol would gladly com=
e back to<br>
its roots.<br>
<br>
=C2=A0 =C2=A0A routing protocol for a VANET may cause redundant wireless fr=
ames in<br>
=C2=A0 =C2=A0the air to check the neighborhood of each vehicle and compute =
the<br>
=C2=A0 =C2=A0routing information in a VANET with a dynamic network topology=
<br>
=C2=A0 =C2=A0because the IPv6 ND is used to check the neighborhood of each<=
br>
=C2=A0 =C2=A0vehicle.=C2=A0 Thus, the vehicular routing needs to take advan=
tage of the<br>
=C2=A0 =C2=A0IPv6 ND to minimize its control overhead.<br>
<br>
&gt;&gt;&gt; A clean description of the interaction of RPL and RFC 8505 in =
our IoT<br>
networks. Note that the speed of the PHY in VANET balanced the instability =
of<br>
the topology, and RPL still applies. Note also that RPL uses DV with a rout=
ing<br>
stretch in order to minimize the topology awareness that=E2=80=99s needed i=
n each node,<br>
which results in minimal signaling.<br>
<br>
5.2.=C2=A0 Mobility Management<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For a mobility management scheme in a shared link, where the w=
ireless<br>
=C2=A0 =C2=A0subnets of multiple IP-RSUs share the same prefix, an efficien=
t<br>
=C2=A0 =C2=A0vehicular-network-wide DAD is required.=C2=A0 If DHCPv6 is use=
d to assign<br>
=C2=A0 =C2=A0a unique IPv6 address to each vehicle in this shared link,<br>
<br>
&gt;&gt;&gt; I would not use the term link, or shared. Maybe shared link -&=
gt; domain?<br>
&lt;snip&gt;<br>
<br>
the DAD is<br>
=C2=A0 =C2=A0not required.=C2=A0 On the other hand, for a mobility manageme=
nt scheme<br>
=C2=A0 =C2=A0with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] a=
nd OMNI<br>
=C2=A0 =C2=A0[OMNI]), DAD is not required because the IPv6 address of a veh=
icle&#39;s<br>
=C2=A0 =C2=A0external wireless interface is guaranteed to be unique.<br>
<br>
&gt;&gt;&gt; again overselling OMNI<br>
&gt;&gt;&gt; As I said earlier, this is wring there are (64*) more chances =
of a<br>
collision in OMNI prefixes than in IPv6 IIDs. &gt;&gt;&gt; OMNI prefixes ca=
n collision,<br>
home addresses that are unique on a home network cannot. &gt;&gt;&gt; Now i=
f both the<br>
OMNI prefix and the IID are good randoms, then obviously, the chances of<br=
>
collisions round up to 0. &gt;&gt;&gt; Collision is certainly not my worst =
fear.<br>
<br>
=C2=A0 There is a<br>
=C2=A0 =C2=A0tradeoff between the prefix usage efficiency and DAD overhead.=
=C2=A0 Thus,<br>
=C2=A0 =C2=A0the IPv6 address autoconfiguration for vehicular networks need=
s to<br>
=C2=A0 =C2=A0consider this tradeoff to support efficient mobility managemen=
t.<br>
<br>
&gt;&gt;&gt; This is way too superficial and hides the reality of things.<b=
r>
- Using a VANET Infra prefix allows direct routability to the internet whic=
h<br>
BYOA does not since the BYOA is not topologically correct. Yes, it costs a =
DAD<br>
with classic ND, but it does not with RCF8505 and the draft fails to mentio=
n<br>
that. - A BYOA needs a tunnel home, and the node needs to know who is reach=
able<br>
inside the VANET and what is not to decide to tunnel or not; this is a<br>
difficult problem (vs. control place overhead) that is not discussed here.<=
br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the case of a multihomed network, a vehicle can follow the=
 first-<br>
=C2=A0 =C2=A0hop router selection rule described in [RFC8028].=C2=A0 That i=
s, the<br>
=C2=A0 =C2=A0vehicle should select its default router for each prefix by<br=
>
=C2=A0 =C2=A0preferring the router that advertised the prefix.<br>
<br>
&gt;&gt;&gt; Still router discovery (in and out) must be very fast. Thing o=
f the RA<br>
intervale in MIPv6. Is that sufficient? Too expensive?<br>
<br>
&lt;snip&gt;<br>
<br>
6.=C2=A0 Security Considerations<br>
&gt;&gt;&gt; Any discussion on the security of classical ND and other opera=
tional issues<br>
(rfc6583) ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Security and privacy are paramount in V2I, V2V, and V2X networ=
king.<br>
=C2=A0 =C2=A0Vehicles and infrastructure must be authenticated in order to<=
br>
=C2=A0 =C2=A0participate in vehicular networking.=C2=A0 Also, in-vehicle de=
vices (e.g.,<br>
=C2=A0 =C2=A0ECU) and a driver/passenger&#39;s mobile devices (e.g., smartp=
hone and<br>
=C2=A0 =C2=A0tablet PC) in a vehicle need to communicate with other in-vehi=
cle<br>
=C2=A0 =C2=A0devices and another driver/passenger&#39;s mobile devices in a=
nother<br>
=C2=A0 =C2=A0vehicle, or other servers behind an IP-RSU in a secure way.=C2=
=A0 Even<br>
=C2=A0 =C2=A0though a vehicle is perfectly authenticated and legitimate, it=
 may be<br>
=C2=A0 =C2=A0hacked for running malicious applications to track and collect=
 its<br>
=C2=A0 =C2=A0and other vehicles&#39; information.=C2=A0 In this case, an at=
tack mitigation<br>
=C2=A0 =C2=A0process may be required to reduce the aftermath of malicious<b=
r>
=C2=A0 =C2=A0behaviors.<br>
<br>
&gt;&gt;&gt; The section should mention that both with classical ND and BYO=
A, addresses<br>
can be impersonated, and RFC 8928 protects against that in both cases while=
<br>
maintaining privacy.<br>
<br>
=C2=A0 =C2=A0Even though vehicles can be authenticated with valid certifica=
tes by<br>
=C2=A0 =C2=A0an authentication server in the vehicular cloud, the authentic=
ated<br>
<br>
&gt;&gt;&gt; Is PKI feasible (deploying it in every car?). Is it fast enoug=
h? Is it<br>
really what IPWAVE thinks vehicle should use????? &gt;&gt;&gt; e.g. why wou=
ld one need<br>
to authenticate to a V2I network? &gt;&gt;&gt; from the text earlier in the=
 doc, it<br>
seemed that what you really want is access that is fast to join, capable of=
<br>
offering the reachability you want, anonymous, and innocuous (cars can not =
harm<br>
one another).<br>
<br>
=C2=A0 =C2=A0vehicles may harm other vehicles, so their communication activ=
ities<br>
=C2=A0 =C2=A0need to be logged in either a central way through a logging se=
rver<br>
=C2=A0 =C2=A0(e.g., TCC) in the vehicular cloud or a distributed way (e.g.,=
<br>
=C2=A0 =C2=A0blockchain [Bitcoin]) along with other vehicles or infrastruct=
ure.<br>
=C2=A0 =C2=A0For the non-repudiation of the harmful activities of malicious=
 nodes,<br>
=C2=A0 =C2=A0a blockchain technology can be used [Bitcoin].=C2=A0 Each mess=
age from a<br>
=C2=A0 =C2=A0vehicle can be treated as a transaction and the neighboring ve=
hicles<br>
=C2=A0 =C2=A0can play the role of peers in a consensus method of a blockcha=
in<br>
=C2=A0 =C2=A0[Bitcoin][Vehicular-BlockChain].=C2=A0 For a blockchain&#39;s =
efficient<br>
=C2=A0 =C2=A0consensus in vehicular networks having fast moving vehicles, a=
 new<br>
=C2=A0 =C2=A0consensus algorithm needs to be developed or an existing conse=
nsus<br>
=C2=A0 =C2=A0algorithm needs to be enhanced.<br>
<br>
&gt;&gt;&gt; solution space; better express the=C2=A0 security needs since =
this is a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To identify malicious vehicles among vehicles, an authenticati=
on<br>
=C2=A0 =C2=A0method is required.<br>
<br>
&gt;&gt;&gt; No. As said earlier a vehicle can be infected. You need innocu=
ousness.which<br>
can come from things like isolation, zerotrust, and protocols that are<br>
difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 is<b=
r>
protected by construction, anonymous, and fast.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the setup of a secure channel over IPsec or TLS, the multi=
hop V2I<br>
=C2=A0 =C2=A0communications over DSRC is required in a highway for the<br>
=C2=A0 =C2=A0authentication by involving multiple intermediate vehicles as =
relay<br>
=C2=A0 =C2=A0nodes toward an IP-RSU connected to an authentication server i=
n the<br>
=C2=A0 =C2=A0vehicular cloud.=C2=A0 The V2I communications over 5G V2X (or =
LTE V2X) is<br>
=C2=A0 =C2=A0required to allow a vehicle to communicate directly with a gNo=
deB (or<br>
=C2=A0 =C2=A0eNodeB) connected to an authentication server in the vehicular=
 cloud.<br>
<br>
&gt;&gt;&gt; solution space. Instead, you could mention that setting up sec=
ured channels<br>
between cars that cross one another might not complete in time to establish=
 the<br>
communication channel, and that the innocuousness must come from zerotrust =
in<br>
the transactions between the cars.<br>
=C2=A0 =C2=A0For the IPv6 ND, the DAD is required to ensure the uniqueness =
of the<br>
=C2=A0 =C2=A0IPv6 address of a vehicle&#39;s wireless interface.<br>
<br>
&gt;&gt;&gt; for classical ND (SLAAC) that=E2=80=99s true. That is not with=
 RFC 8505, since the<br>
infra maintains a table of all addresses in use in the prefix and blocks<br=
>
duplicates without the RFC 4862 DAD method. The stateful autoconf address g=
rant<br>
is immediate.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This DAD can be used<br>
=C2=A0 =C2=A0as a flooding attack that uses the DAD-related ND packets<br>
=C2=A0 =C2=A0disseminated over the VANET or vehicular networks.<br>
<br>
&gt;&gt;&gt; also for DOS attacks. You can block a owner from using an addr=
ess. A<br>
reference to rfc6959 is much needed here.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0This possibility<br>
=C2=A0 =C2=A0indicates that the vehicles and IP-RSUs need to filter out sus=
picious<br>
=C2=A0 =C2=A0ND traffic in advance.=C2=A0 Based on the SEND [RFC3971] mecha=
nism, the<br>
=C2=A0 =C2=A0authentication for routers (i.e., IP-RSUs) can be conducted by=
 only<br>
=C2=A0 =C2=A0selecting an IP-RSU that has a certification path toward trust=
ed<br>
=C2=A0 =C2=A0parties.=C2=A0 For authenticating other vehicles, the cryptogr=
aphically<br>
=C2=A0 =C2=A0generated address (CGA) can be used to verify the true owner o=
f a<br>
=C2=A0 =C2=A0received ND message, which requires to use the CGA ND option i=
n the<br>
=C2=A0 =C2=A0ND protocols.=C2=A0 For a general protection of the ND mechani=
sm, the RSA<br>
=C2=A0 =C2=A0Signature ND option can also be used to protect the integrity =
of the<br>
=C2=A0 =C2=A0messages by public key signatures.=C2=A0 For a more advanced<b=
r>
=C2=A0 =C2=A0authentication mechanism, a distributed blockchain-based mecha=
nism<br>
=C2=A0 =C2=A0[Vehicular-BlockChain] can be used.<br>
<br>
&gt;&gt;&gt; solution space. Again, the draft should focus on problems and =
needs. The<br>
problem here is that SEND is complex, and not implemented in the major stac=
k.<br>
It relies on PKI for trusting the router. The V2I need is a zerotrust model=
<br>
where one V, the other local Vs, and the I, can help each other anonymously=
 and<br>
harmlessly. &lt;snip&gt;<br>
<br>
8.=C2=A0 Informative References<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&lt;snip&gt;<br>
<br>
Voila!<br>
<br>
Keep safe;<br>
<br>
Pascal<br>
<br>
<br>
<br>
_______________________________________________<br>
its mailing list<br>
<a href=3D"mailto:its@ietf.org" target=3D"_blank">its@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/its" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/its</a><u></u><u></u></span></font></p>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>

</blockquote></div>

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From: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
Date: Fri, 3 Sep 2021 13:52:08 +0900
Message-ID: <CAPK2DeyZ56xRA3Lby5sQ38J388B3x10E5qy2k9=JUSOgfvE=wg@mail.gmail.com>
To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
Cc: CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es>, Erik Kline <ek.ietf@gmail.com>,  "int-dir@ietf.org" <int-dir@ietf.org>, Last Call <last-call@ietf.org>, "its@ietf.org" <its@ietf.org>,  Russ Housley <housley@vigilsec.com>, Chris Shen <shenyiwen7@gmail.com>,  skku-iotlab-members <skku-iotlab-members@googlegroups.com>,  "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
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Subject: Re: [Int-dir] [ipwave] Intdir last call review of draft-ietf-ipwave-vehicular-networking-20
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Pascal,
Thanks a lot for your help and confirmation.

Take care, too.

Best Regards,
Paul

On Fri, Sep 3, 2021 at 1:23 PM Pascal Thubert (pthubert) <pthubert@cisco.co=
m>
wrote:

> All good Paul,
>
> we=E2=80=99re done for this round. Good luck for the next steps!
>
> Take care,
>
> Pascal
>
> Le 3 sept. 2021 =C3=A0 05:22, Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.=
com>
> a =C3=A9crit :
>
> =EF=BB=BF
> Hi Pascal,
> Thanks for your help to improve this draft significantly.
>
> I have included your suggested text in the revision (-23) as follows:
>
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-network=
ing-23
>
> -------------------------------------------------------------------------=
---------------------------------------------------------------
> Section 5.1.3. Routing
> ...
> RPL [RFC6550] defines a routing protocol for low-power and
> lossy networks, which constructs and maintains Destination-Oriented
> Directed Acyclic Graphs (DODAGs) optimized by an Objective Function
> (OF). A defined OF provides route selection and optimization within
> an RPL topology. A node in a DODAG discovers and maintains the
> upward routes toward the root node of the DODAG. RPL uses a Distance
> Vector (DV) approach, with lazy maintenance and stretched anisotropic
> routing. It is well-designed to reduce the topological knowledge and
> routing state that needs to be exchanged. As a result, the routing
> protocol overhead is minimized, which allows either highly
> constrained stable networks or less constrained, highly dynamic
> networks. Refer to Appendix B for the detailed description of RPL for
> multihop V2X networking.
>
> An address registration extension for 6LoWPAN (IPv6 over Low-Power
> Wireless Personal Area Network) in [RFC8505] can support light-weight
> mobility for nodes moving through different parents. [RFC8505], as
> opposed to [RFC4861], is stateful and proactively installs the ND
> cache entries, which saves broadcasts and provides a deterministic
> presence information for IPv6 addresses. Mainly it updates the
> Address Registration Option (ARO) of ND defined in [RFC6775] to
> include a status field that can indicate the movement of a node and
> optionally a Transaction ID (TID) field, i.e., a sequence number that
> can be used to determine the most recent location of a node. Thus,
> RPL can use the information provided by the Extended ARO (EARO)
> defined in [RFC8505] to deal with a certain level of node mobility.
> When a leaf node moves to the coverage of another parent node, it
> should de-register its addresses to the previous parent node and
> register itself with a new parent node along with an incremented TID.
>
> -------------------------------------------------------------------------=
---------------------------------------------------------------
>
> If you are satisfied with this revision, could you update
> the status of INTDIR Last Call Review into Ready?
> https://datatracker.ietf.org/doc/draft-ietf-ipwave-vehicular-networking/
>
> Carlos and Erik,
> If Pascal confirms the readiness of this draft,
> let's move it out to the next step.
>
> Thanks.
>
> Best Regards,
> Paul
>
> On Fri, Sep 3, 2021 at 12:50 AM Pascal Thubert (pthubert) <
> pthubert@cisco.com> wrote:
>
>> You did well Paul, but I wonder if the reader of section 5.1 really care=
s
>> about the guts of the protocols (DIO messages, who cares?) vs. what the
>> protocol is optimized for.
>>
>>
>>
>> I had the same feeling about the next paragraph where you describe 8505.
>> While what you are saying is correct is that of interest for the reader?
>>
>>
>>
>> The interesting piece IMHO is that 8505, as opposed to 4861,  is statefu=
l
>> and proactively installs the ND cache entries, which saves broadcasts an=
d
>> provides a deterministic presence information for IPv6 addresses=E2=80=
=9D. This is
>> what I=E2=80=99d like to see written there. For the RPL piece, if you wa=
nt to
>> summarize my text, please insist on the fact that it=E2=80=99s =E2=80=9C=
DV, with lazy
>> maintenance and stretched anisotropic routing, all designed to reduce th=
e
>> topological knowledge and routing state that needs to be exchanged. As a
>> result, the routing protocol overhead is minimized, which allows either
>> highly constrained stable networks or less constrained highly dynamic
>> networks=E2=80=9D.
>>
>>
>>
>> *From:* Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
>> *Sent:* jeudi 2 septembre 2021 17:30
>> *To:* Pascal Thubert (pthubert) <pthubert@cisco.com>
>> *Cc:* int-dir@ietf.org; Last Call <last-call@ietf.org>; its@ietf.org;
>> Russ Housley <housley@vigilsec.com>; CARLOS JESUS BERNARDOS CANO <
>> cjbc@it.uc3m.es>; Chris Shen <shenyiwen7@gmail.com>; Mr. Jaehoon Paul
>> Jeong <jaehoon.paul@gmail.com>
>> *Subject:* Re: [ipwave] Intdir last call review of
>> draft-ietf-ipwave-vehicular-networking-20
>>
>>
>>
>> Hi Pascal,
>>
>> I have reflected your comments on the revision:
>>
>>
>> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networ=
king-22
>>
>>
>>
>> Though the text provided by you is excellent, it is long, so I place it
>> on Appendix B:
>>
>>
>> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networ=
king-22#appendix-B
>>
>>
>>
>> In Section 5.1.3.  Routing, I explain RPL concisely along with pros and
>> cons:
>>
>>
>> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networ=
king-22#section-5.1.3
>>
>>
>>
>> The changes with my some editings look like the following:
>>
>>
>> ------------------------------------------------------------------------=
----------------------------------------------
>>
>> 5.1.3. Routing
>> ...
>> RPL [RFC6550] defines a routing protocol for low-power and lossy
>> networks, which constructs and
>>
>> maintains DODAGs optimized by an Objective Function (OF). A defined OF
>> provides route selection
>>
>> and optimization within an RPL topology. A node in a DODAG uses DODAG
>> Information Objects (DIOs)
>>
>> messages to discover and maintain the upward routes toward the root node=
.
>> Refer to Appendix B for
>>
>> the detailed description of RPL for multihop V2X networking.
>> ...
>> ----------
>> Appendix B. Support of Multihop V2X Networking
>> ...
>> RPL is primarily designed to minimize the control plane activity, which
>> is the relative amount of routing
>>
>> protocol exchanges versus data traffic; this approach is beneficial for
>> situations where the power and
>>
>> bandwidth are scarce (e.g., an IoT LLN where RPL is typically used
>> today), but also in situations of
>>
>> high relative mobility between the nodes in the network (also known as
>> swarming, e.g., within a
>>
>> variable set of vehicles with a similar global motion, or a variable set
>> of drones flying toward the same
>>
>> direction).
>>
>> To reduce the routing exchanges, RPL leverages a Distance Vector
>> approach, which does not need a
>>
>> global knowledge of the topology, and only optimizes the routes to and
>> from the root, allowing
>>
>> Peer-to-Peer (P2P) paths to be stretched. Although RPL installs its
>> routes proactively, it only maintains
>>
>> them lazily, that is, in reaction to actual traffic, or as a slow
>> background activity. Additionally, RPL
>>
>> leverages the concept of an objective function (called OF), which allows
>> to adapt the activity of the
>>
>> routing protocol to use cases, e.g., type, speed, and quality of the
>> radios. RPL does not need converge,
>>
>> and provides connectivity to most nodes most of the time. The default
>> route toward the root is
>>
>> maintained aggressively and may change while a packet progresses without
>> causing loops, so the
>>
>> packet will still reach the root. There are two modes for routing in RPL
>> such as non-storing mode and
>>
>> storing mode. In non-storing mode, a node inside the mesh/swarm that
>> changes its point(s) of
>>
>> attachment to the graph informs the root with a single unicast packet
>> flowing along the default route,
>>
>> and the connectivity is restored immediately; this mode is preferable fo=
r
>> use cases where Internet
>>
>> connectivity is dominant. On the other hand, in storing mode, the routin=
g
>> stretch is reduced, for a
>>
>> better P2P connectivity, while the Internet connectivity is restored mor=
e
>> slowly, during the time for
>>
>> the DV operation to operate hop-by-hop. While an RPL topology can quickl=
y
>> scale up and down and
>>
>> fits the needs of mobility of vehicles, the total performance of the
>> system will also depend on how
>>
>> quickly a node can form an address, join the mesh (including
>> Authentication, Authorization, and
>>
>> Accounting (AAA)), and manage its global mobility to become reachable
>> from another node outside
>>
>> the mesh.
>> ...
>>
>>
>> ------------------------------------------------------------------------=
----------------------------------------------
>>
>>
>>
>> If you have further comments, please let me know.
>>
>>
>>
>> Thanks.
>>
>>
>>
>> Best Regards,
>>
>> Paul
>>
>>
>>
>> On Thu, Sep 2, 2021 at 3:49 PM Pascal Thubert (pthubert) <
>> pthubert@cisco.com> wrote:
>>
>> Hello Paul
>>
>>
>>
>> This is absolutely excellent. I=E2=80=99m very happy will all the change=
s and
>> your attached pdf made my life as a reviewer a lot simpler.
>>
>>
>>
>> This is really a great way of progressing together. Many thanks for that=
!
>>
>>
>>
>> I=E2=80=99m all good but for a little snippet in the new text which is a=
ctually
>> incorrect, and denotes a usual misunderstanding of RPL that your doc may
>> help correct for the future:
>>
>>
>>
>> =E2=80=9C
>>
>> Although RPL can be used in IPv6-based vehicular networks, it is
>> primarily designed for lossy
>>
>> networks, which puts energy efficiency first. In addition, the topology
>> it considers may not
>>
>> quickly scale up and down for IPv6-based vehicular networks, since the
>> mobility of vehicles is
>>
>> much more diverse with a high speed, so it can frequently alter a
>> tree-like topology formed by
>>
>> RPL, which may cause network fragmentation and merging with more control
>> traffic
>>
>> =E2=80=9C
>>
>>
>>
>>
>>
>> The roots of my contribution to RPL are in vehicular networks, exactly
>> the use case you describe. Based on that experience (including some actu=
al
>> test with NASA) I=E2=80=99d change the text above with:
>>
>>
>>
>>
>>
>> =E2=80=9C
>>
>> RPL is primarily designed to minimize the control plane activity, that i=
s
>> the relative amount of routing protocol exchanges vs. data traffic; this
>> approach is beneficial for situations where the power and bandwidth are
>> scarce (e.g., an IoT LLN where RPL is typically used today), but also in
>> situations of high relative mobility between the nodes in the network (a=
ka
>> swarming, e.g., within a variable set of vehicles with a similar global
>> motion, or a toon of drones).
>>
>> To reduce the routing exchanges, RPL leverages a Distance Vector
>> approach, which does not need a global knowledge of the topology, and on=
ly
>> optimizes the routes to and from the root, allowing P2P paths to be
>> stretched. Although RPL installs its routes proactively, it only maintai=
ns
>> them lazily, in reaction to actual traffic, or as a slow background
>> activity. Additionally, RPL leverages the concept of an objective functi=
on,
>> which allows to adapt the activity of the routing protocol to the use ca=
se,
>> e.g., type, speed, and quality of the radios. RPL does not need converge=
,
>> and provides connectivity to most nodes most of the time. The default ro=
ute
>> towards the Root is maintained aggressively and may change while a packe=
t
>> progresses without causing loops, so the packet will still reach the roo=
t.
>> In non-storing mode, a node inside the mesh/swarm that changes its point=
(s)
>> of attachment to the graph informs the root with a single unicast packet
>> the flows along the default route, and the connectivity is restored
>> immediately; this mode is preferable for use cases where internet
>> connectivity is dominant. OTOH, in storing mode, the routing stretch is
>> reduced, for a better P2P connectivity, while the internet connectivity =
is
>> restored more slowly, time for the DV operation to operate hop-by-hop.
>> While a RPL topology can quickly scale up and down and fits the needs of
>> mobility of vehicles, the total performance of the system will also depe=
nd
>> on how quickly a node can form an address, join the mesh (including AAA)=
,
>> and manage its global mobility to become reachable from outside the mesh=
.
>>
>> =E2=80=9C
>>
>>
>>
>> Otherwise, all good!
>>
>>
>>
>> Take care,
>>
>>
>>
>> Pascal
>>
>>
>>
>>
>>
>> *From:* Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
>> *Sent:* lundi 30 ao=C3=BBt 2021 15:12
>> *To:* Pascal Thubert (pthubert) <pthubert@cisco.com>
>> *Cc:* int-dir@ietf.org; Last Call <last-call@ietf.org>;
>> draft-ietf-ipwave-vehicular-networking.all@ietf.org; its@ietf.org; Russ
>> Housley <housley@vigilsec.com>; CARLOS JESUS BERNARDOS CANO <
>> cjbc@it.uc3m.es>; skku-iotlab-members <
>> skku-iotlab-members@googlegroups.com>; Chris Shen <shenyiwen7@gmail.com>=
;
>> Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
>> *Subject:* Re: [ipwave] Intdir last call review of
>> draft-ietf-ipwave-vehicular-networking-20
>>
>>
>>
>> Hi Pascal,
>>
>> Here is the revision (-21) of IPWAVE PS Draft:
>>
>>
>> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networ=
king-21
>>
>>
>>
>> I attach the revision letter to show how I have addressed your comments
>> on the revision.
>>
>>
>>
>> Chris and I have worked for this revision together.
>>
>>
>>
>> If you have further comments, please let me know.
>>
>>
>>
>> Thanks.
>>
>>
>>
>> Best Regards,
>>
>> Paul
>>
>>
>>
>>
>>
>>
>>
>> On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert via Datatracker <
>> noreply@ietf.org> wrote:
>>
>> Reviewer: Pascal Thubert
>> Review result: Not Ready
>>
>> Dear authors
>>
>> In summary:
>>
>> I read a number of very good drafts collated in one, from the use cases
>> that
>> very complete and ready to publish, to the architecture and protocol
>> solution
>> in section 4 that would require more work for completeness.
>>
>> There are multiple instances in the use cases where protocols are listed
>> coming
>> out of the blue, e.g., the references to OMNI that seem artificially
>> spread
>> regardless of the context of the section. OMNI is used throughout, both
>> as an
>> open ended toolbox, and as a carpet under which all problems can be
>> hidden.
>>
>> Reading this doc, OMNI shows as an interface to a software mobile router=
,
>> with
>> multiple of the device physical interfaces connected to the mobile
>> router. This
>> makes the stack very simple as the complexity moves to the router. But
>> now you
>> have to implement the router. Presented as that, the OMNI router deserve=
s
>> its
>> name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANE=
T (many to
>> choose from) and NEMO (and all the MIP protocol family across address
>> families), all the possible radio interfaces on which the ND problems go
>> away
>> by magic, and whatever else you want to put in there. Is that the
>> intention?
>>
>> Instead of referring to OMNI for virtually anything, the doc should refe=
r
>> to
>> MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),
>> draft-nordmark-intarea-ippl for split subnets, and
>> draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet
>> models. And
>> then you can say that all those components can be plugged in the OMNI
>> router,
>> and you can discuss which MANET and which MIP you want, including using
>> OMNI=E2=80=99s
>> built in mobility.
>>
>> Note that my objections are not against the OMNI design, it might be the
>> perfect thing and I am already aware of use cases that could be served b=
y
>> a
>> P2MP interface like OMNI in conjunction with RFC8505 on the P2P
>> subinterfaces
>> (recycling the high level design we=E2=80=99ve been shipping for IPv4 / =
frame
>> relay for
>> the last 30 years). My objection is of the way the draft uses [OMNI] as
>> the
>> magic wand that solves all the problems when what you really do is throw
>> them
>> over the fence. I=E2=80=99d rather you focus on problems and use cases, =
for which
>> there=E2=80=99s excellent text, and indicate what needs to be done witho=
ut making
>> assumption on how the needful things will be solved.
>>
>> In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to =
split,
>> keep all
>> that=E2=80=99s use case and problem description and ship it, remove refe=
rences to
>> protocols envisioned in the solution, and start the work on architecture
>> of the
>> solution and the protocol applicability statements separately. An
>> alternate
>> would be to centralize the discussion on protocols to annex, and explain
>> that
>> protocol A or B could be envisioned in solution space because to over
>> this gap
>> or implement that function.
>>
>> In any fashion, the current text is not ready for publication as
>> applicability
>> statement, architecture and or/solution, so the related work should be
>> removed
>> from the main text. But I find it mostly ready for use case and problem
>> statement, more below.
>>
>> Review:
>>
>> Abstract
>>
>>    This document discusses the problem statement and use cases of
>>    IPv6-based vehicular networking for Intelligent Transportation
>>    Systems (ITS).
>>
>> >>> The document goes beyond that; there was actually a thread at 6MAN
>> where
>> Bob Hinden said =E2=80=9C This document says it is a problem statement, =
but then
>> becomes a solution document.   Might be better to cut it down to only th=
e
>> problem statement part. =E2=80=9C >>> Would you consider doing this? If =
not, why?
>> Note:
>> you may want to respond on 6MAN as well. >>> >>>I would have thought tha=
t
>> the
>> traditional steps of problem statement and applicability statement of
>> existing
>> work could be expected from IPWAVE too. >>> Please clarify the steps tha=
t
>> you
>> intend to follow next with this work.
>>
>> <snip>
>>
>> 1.  Introduction
>>
>> >>> Very readable and informative section, many thanks!
>>
>>    Along with these WAVE standards and C-V2X standards, regardless of a
>>    wireless access technology under the IP stack of a vehicle, vehicular
>>    networks can operate IP mobility with IPv6 [RFC8200] and Mobile IPv6
>>    protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (PMIPv6)
>>    [RFC5213], Distributed Mobility Management (DMM) [RFC7333], Locator/
>>    ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Extended
>>    Route Optimization (AERO) [RFC6706BIS]).
>>
>> >>> NEMO (RFC 3963) is not cited. Any reason why the vehicle would not
>> transport a network?
>>
>> <snip>
>>
>>    This document describes use cases and a problem statement about
>>    IPv6-based vehicular networking for ITS, which is named IPv6 Wireless
>>    Access in Vehicular Environments (IPWAVE).  First, it introduces the
>>    use cases for using V2V, V2I, and V2X networking in ITS.  Next, for
>>    IPv6-based vehicular networks, it makes a gap analysis of current
>>    IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Management,
>>    and Security & Privacy), and then enumerates requirements for the
>>    extensions of those IPv6 protocols, which are tailored to IPv6-based
>>    vehicular networking.  Thus, this document is intended to motivate
>>    development of key protocols for IPWAVE.
>>
>> >>>
>>
>> <snip>
>>
>> 2.  Terminology
>>
>> >>>
>>
>> <snip>
>>
>>    o  IP-OBU: "Internet Protocol On-Board Unit": An IP-OBU denotes a
>>       computer situated in a vehicle (e.g., car, bicycle, autobike,
>>       motor cycle, and a similar one) and a device (e.g., smartphone and
>>       IoT device).  It has at least one IP interface that runs in IEEE
>>       802.11-OCB and has an "OBU" transceiver.  Also, it may have an IP
>>       interface that runs in Cellular V2X (C-V2X) [TS-23.285-3GPP]
>>       [TR-22.886-3GPP][TS-23.287-3GPP].  See the definition of the term
>>       "OBU" in [RFC8691].
>>
>> >>> Can that be a router connecting multiple computers?
>>
>> <snip>
>>
>> 3.  Use Cases
>>
>> >>> This is another great read and an enlightening section. Maybe mentio=
n
>> in
>> the abstract that the doc also covers use cases?
>>
>> <snip>
>>
>>    Although a Layer-2 solution can provide a support for multihop
>>    communications in vehicular networks, the scalability issue related
>>    to multihop forwarding still remains when vehicles need to
>>    disseminate or forward packets toward multihop-away destinations.  In
>>    addition, the IPv6-based approach for V2V as a network layer protocol
>>    can accommodate multiple radio technologies as MAC protocols, such as
>>    5G V2X and DSRC.  Therefore, the existing IPv6 protocol can be
>>    augmented through the addition of an Overlay Multilink Network (OMNI)
>>    Interface [OMNI] and/or protocol changes in order to support both
>>    wireless single-hop/multihop V2V communications and multiple radio
>>    technologies in vehicular networks.  In such a way, vehicles can
>>    communicate with each other by V2V communications to share either an
>>    emergency situation or road hazard in a highway having multiple kinds
>>    of radio technologies, such as 5G V2X and DSRC.
>>
>> >>> This text appears in the middle of high level use case, with a crude
>> list
>> of protocols; this is not a place for it
>>
>> >>> On a 6MAN Thread, Brian Carpenter said that the above:
>> =E2=80=9C
>> is of concern regardless of the mention of OMNI. Does it mean "can be" o=
r
>> "needs to be"? This paragraph seems like a very short summary of a big
>> problem
>> area. At the end of page 13 there is some related discussion, which
>> mentions
>> RPL as part of the solution (good choice, IMHO) but again seems to depen=
d
>> on
>> OMNI. I don't think the fix of simply removing references to OMNI works,
>> because it would leave a gap. In an informational document, that is not =
a
>> formal problem but as far as this draft describes architecture, I don't
>> think
>> that big a gap is reasonable. "OMNI" is mentioned more than 20 times in
>> the
>> document. There are also several references to AERO, which is strongly
>> associated with OMNI. =E2=80=9C >>> I agree with Brian. Here the documen=
t seems
>> to be
>> mixing solution with problem and putting the cart before the horse. My
>> recommendation is to stick to what needs to be done that IPv6 does not d=
o
>> yet
>> -the reqs and gaps-; but the doc should not step in the how things will
>> be done
>> unless the group already decided to do it. The logical next steps to a P=
S
>> are
>> an applicability statement of existing work, and if the gaps cannot be
>> filled,
>> there may be one or more WG chartered to fill those gaps.
>>
>> >>> I=E2=80=99d still be happy to see an annex with leads on where the s=
olution
>> might
>> come from like RFC 8691 does.
>>
>> <snip>
>>
>>    The existing IPv6 protocol must be augmented through the addition of
>>    an OMNI interface and/or protocol changes in order to support
>>    wireless multihop V2I communications in a highway where RSUs are
>>    sparsely deployed, so a vehicle can reach the wireless coverage of an
>>    RSU through the multihop data forwarding of intermediate vehicles.
>>    Thus, IPv6 needs to be extended for multihop V2I communications.
>>
>> >>> Note that I have no clue on how well OMNI applies in that space,
>> maybe it
>> does very well; but here it comes out of the blue with no justification.
>> If you
>> mention OMNI you need to detail what it is and which of the V2V  problem=
s
>> you
>> expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.
>>
>> <snip>
>>
>>    The existing IPv6 protocol must be augmented through the addition of
>>    an OMNI interface and/or protocol changes in order to support
>>    wireless multihop V2X (or V2I2X) communications in an urban road
>>    network where RSUs are deployed at intersections, so a vehicle (or a
>>    pedestrian's smartphone) can reach the wireless coverage of an RSU
>>    through the multihop data forwarding of intermediate vehicles (or
>>    pedestrians' smartphones).  Thus, IPv6 needs to be extended for
>>    multihop V2X (or V2I2X) communications.
>>
>> >>> Please be more specific on what the missing functions are and whethe=
r
>> they
>> are missing from the stack development standpoint or if there=E2=80=99s =
work
>> needed
>> from the IETF. 1)      If something is really missing in our specs, the
>> text to
>> prove from the use case above is missing 2)      how OMNI serves the use
>> case
>> could be elaborated in an applicability statement of OMNI for V2xyz, but
>> it is
>> a bit blunt to present it as panacea when the problems to be solved are
>> not
>> listed. 3)      If you look at it, OMNI seems like a software mobile
>> router
>> within a bump in the stack. Can that become too big?
>>
>> >>> my view is that the text above and the similar occasions should be
>> replaced
>> by something like :
>>
>>    The existing IPv6 protocol must be augmented to provide the following
>>    functions: 1) =E2=80=A6
>>
>> >>> and / or something like:
>>
>>    In addition to the IPv6 node requirements [RFC 8504], the IPv6 protoc=
ol
>>    stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=A6
>>
>> <snip>
>>
>>    To support applications of these V2X use cases, the functions of IPv6
>>    such as VND, VMM, and VSP are prerequisites for IPv6-based packet
>>    exchange, transport-layer session continuity, and secure, safe
>>    communication between a vehicle and a pedestrian either directly or
>>    indirectly via an IP-RSU.
>>
>> >>> =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=9D do=
es not parse.
>> There=E2=80=99s
>> no IPv6 reference that provides those functions. If the intention is to
>> say
>> that there=E2=80=99s stuff to add to IPv6 to support, like, say,  VND, t=
hen this
>> document fails to define how an IPv6 VND should behave, though it=E2=80=
=99s
>> precisely
>> what I=E2=80=99d expect from a problem statement.
>>
>> <snip>
>>
>> 4.  Vehicular Networks
>>
>> >>> What is the purpose of section 4 as a whole, problem statement or
>> applicability statement of the listed protocols? In the former case
>> what=E2=80=99s the
>> problem? In the latter case it is incomplete and needs to be exported to
>> an
>> applicability statement doc with all the possible technologies evaluated=
.
>>
>>    This section describes an example vehicular network architecture
>>    supporting V2V, V2I, and V2X communications in vehicular networks.
>>
>> >>> I read this as presenting a context to explain what the problems are
>> instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe u=
sing the term
>> =E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=
=99s comment.
>>
>> <snip>
>>
>> 4.1.  Vehicular Network Architecture
>>
>>    Figure 1 shows an example vehicular network architecture for V2I and
>>    V2V in a road network [OMNI].
>>
>> a.      Is using OMNI a decision that the WG made for the future work ?
>> what
>> does it do and what does it not do? b.      Is there work left to be
>> done? Who
>> will do that work? Or is it the expectation that OMNI has it all defined
>> already?
>>
>> <snip>
>>
>>    An existing network architecture (e.g., an IP-based aeronautical
>>    network architecture [OMNI][UAM-ITS], a network architecture of
>>    PMIPv6 [RFC5213], and a low-power and lossy network architecture
>>    [RFC6550]) can be extended to a vehicular network architecture for
>>    multihop V2V, V2I, and V2X, as shown in Figure 1.  In a highway
>>    scenario, a vehicle may not access an RSU directly because of the
>>    distance of the DSRC coverage (up to 1 km).  For example, the OMNI
>>    interface and/or RPL (IPv6 Routing Protocol for Low-Power and Lossy
>>    Networks) [RFC6550] can be extended to support a multihop V2I since a
>>    vehicle can take advantage of other vehicles as relay nodes to reach
>>    the RSU.  Also, RPL can be extended to support both multihop V2V and
>>    V2X in the similar way.
>>
>> >>> all this could fit well in annex; anyway you need to explain what yo=
u
>> expect the protocols to do and which extension is needed. In the case of
>> RPL at
>> least you indicate that it would do routing, but not why you cannot use
>> it of
>> the shelf; for OMNI, what you expect is less clear, though there=E2=80=
=99s text
>> elsewhere about the many radio interfaces that could be used for the
>> purpose,
>> and the text in the UAM below that is enlightening.
>>
>> <snip>
>>
>>                                   To support not only the mobility
>>    management of the UAM end systems, but also the multihop and
>>    multilink communications of the UAM interfaces, the UAM end systems
>>    can employ an Overlay Multilink Network (OMNI) interface [OMNI] as a
>>    virtual Non-Broadcast Multiple Access (NBMA) connection to a serving
>>    ground domain infrastructure.
>>
>> >>> Again, what is the expectation for OMNI? As an overlay it requires a=
n
>> underlay; when connecting to a MANET it needs support for that MANET. Th=
e
>> text
>> above seems to imply that is solves everything in V2xyz like magic;
>> reminds me
>> of the IPv6 multicast abstraction that was supposed to solve the broadca=
st
>> problem and ended up worsening it.
>>
>> <snip>
>>
>>                             This infrastructure can be configured
>>    over the underlying data links.  The OMNI interface and its link
>>    model provide a means of multilink, multihop and mobility
>>    coordination to the legacy IPv6 ND messaging [RFC4861] according to
>>    the NBMA principle.  Thus, the OMNI link model can support efficient
>>    UAM internetworking services without additional mobility messaging,
>>    and without any modification to the IPv6 ND messaging services or
>>    link model.
>>
>> >>> Again, what is the expectation for OMNI? As an overlay it requires a=
n
>> underlay; the text above seems to imply that is solves everything in
>> V2xyz like
>> magic; that would be a stretch, that reminds me of IPv6 multicast that w=
as
>> supposed to solve the broadcast problem and ended up worsening it.
>>
>> <snip>
>>
>>    Multiple vehicles under the coverage of an RSU share a prefix just as
>>    mobile nodes share a prefix of a Wi-Fi access point in a wireless
>>    LAN.  This is a natural characteristic in infrastructure-based
>>    wireless networks.  For example, in Figure 1, two vehicles (i.e.,
>>    Vehicle2, and Vehicle5) can use Prefix 1 to configure their IPv6
>>    global addresses for V2I communication.  Alternatively, mobile nodes
>>    can employ an OMNI interface and use their own IPv6 Unique Local
>>    Addresses (ULAs) [RFC4193] over the wireless network without
>>    requiring the messaging of IPv6 Stateless Address Autoconfiguration
>>   (SLAAC) [RFC4862], which uses an on-link prefix provided by the
>>    (visited) wireless LAN; this technique is known as "Bring-Your-Own-
>>    Addresses".
>>
>> >>>  Is OMNI the only way to "Bring-Your-Own-Addresses=E2=80=9D? Else th=
e text
>> could be
>> more generic, at least use e.g., like the ref to AERO later. >>> What ar=
e
>> the
>> implications / limitations of doing that =E2=80=93 like they can do line=
 of sight
>> V2V
>> but not reach the internet, or the need of  a local MANET / RPL that wil=
l
>> accept to route those addresses, or the security / address ownership
>> validation
>> issues ?
>>
>> <snip>
>>
>>    A single subnet prefix announced by an RSU can span multiple vehicles
>>    in VANET.  For example, in Figure 1, for Prefix 1, three vehicles
>>    (i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a connected
>>    VANET.  Also, for Prefix 2, two vehicles (i.e., Vehicle3 and
>>    Vehicle6) can construct another connected VANET, and for Prefix 3,
>>    two vehicles (i.e., Vehicle4 and Vehicle7) can construct another
>>    connected VANET.  Alternatively, each vehicle could employ an OMNI
>>    interface with their own ULAs such that no topologically-oriented
>>    subnet prefixes need be announced by the RSU.
>>
>> >>>  same as above. This seems to restate the same thing, derive an
>> address
>> from a topologically correct prefix or use your own with limitations to =
be
>> described.
>>
>> <snip>
>>
>>    For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]
>>    specifies several details, including Maximum Transmission Unit (MTU),
>>    frame format, link-local address, address mapping for unicast and
>>    multicast, stateless autoconfiguration, and subnet structure.  An
>>    Ethernet Adaptation (EA) layer is in charge of transforming some
>>    parameters between the IEEE 802.11 MAC layer and the IPv6 network
>>    layer, which is located between the IEEE 802.11-OCB's logical link
>>    control layer and the IPv6 network layer.  This IPv6 over 802.11-OCB
>>    can be used for both V2V and V2I in IPv6-based vehicular networks.
>>
>> >>>  solution space.
>>
>> <snip>
>>
>>    An IPv6 mobility solution is needed for the guarantee of
>>    communication continuity in vehicular networks so that a vehicle's
>>    TCP session can be continued, or UDP packets can be delivered to a
>>    vehicle as a destination without loss while it moves from an IP-RSU's
>>    wireless coverage to another IP-RSU's wireless coverage.  In
>>    Figure 1, assuming that Vehicle2 has a TCP session (or a UDP session)
>>    with a corresponding node in the vehicular cloud, Vehicle2 can move
>>    from IP-RSU1's wireless coverage to IP-RSU2's wireless coverage.  In
>>    this case, a handover for Vehicle2 needs to be performed by either a
>>    host-based mobility management scheme (e.g., MIPv6 [RFC6275]) or a
>>    network-based mobility management scheme (e.g., PMIPv6 [RFC5213] and
>>    AERO [RFC6706BIS]).
>>
>>    In the host-based mobility scheme (e.g., MIPv6), an IP-RSU plays a
>>    role of a home agent.  On the other hand, in the network-based
>>    mobility scheme (e.g., PMIPv6, an MA plays a role of a mobility
>>    management controller such as a Local Mobility Anchor (LMA) in
>>    PMIPv6, which also serves vehicles as a home agent, and an IP-RSU
>>    plays a role of an access router such as a Mobile Access Gateway
>>    (MAG) in PMIPv6 [RFC5213].  The host-based mobility scheme needs
>>    client functionality in IPv6 stack of a vehicle as a mobile node for
>>    mobility signaling message exchange between the vehicle and home
>>    agent.  On the other hand, the network-based mobility scheme does not
>>    need such a client functionality for a vehicle because the network
>>    infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility agent
>>    handles the mobility signaling message exchange with the home agent
>>    (e.g., LMA in PMIPv6) for the sake of the vehicle.
>>
>>    There are a scalability issue and a route optimization issue in the
>>    network-based mobility scheme (e.g., PMIPv6) when an MA covers a
>>    large vehicular network governing many IP-RSUs.  In this case, a
>>    distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate the
>>    scalability issue by distributing multiple MAs in the vehicular
>>    network such that they are positioned closer to vehicles for route
>>    optimization and bottleneck mitigation in a central MA in the
>>    network-based mobility scheme.  All these mobility approaches (i.e.,
>>    a host-based mobility scheme, network-based mobility scheme, and
>>    distributed mobility scheme) and a hybrid approach of a combination
>>    of them need to provide an efficient mobility service to vehicles
>>    moving fast and moving along with the relatively predictable
>>    trajectories along the roadways.
>>
>>    In vehicular networks, the control plane can be separated from the
>>    data plane for efficient mobility management and data forwarding by
>>    using the concept of Software-Defined Networking (SDN)
>>    [RFC7149][DMM-FPC].  Note that Forwarding Policy Configuration (FPC)
>>    in [DMM-FPC], which is a flexible mobility management system, can
>>    manage the separation of data-plane and control-plane in DMM.  In
>>    SDN, the control plane and data plane are separated for the efficient
>>    management of forwarding elements (e.g., switches and routers) where
>>    an SDN controller configures the forwarding elements in a centralized
>>    way and they perform packet forwarding according to their forwarding
>>    tables that are configured by the SDN controller.  An MA as an SDN
>>    controller needs to efficiently configure and monitor its IP-RSUs and
>>    vehicles for mobility management, location management, and security
>>    services.
>>
>>    The mobility information of a GPS receiver mounted in its vehicle
>>    (e.g., position, speed, and direction) can be used to accommodate
>>    mobility-aware proactive handover schemes, which can perform the
>>    handover of a vehicle according to its mobility and the wireless
>>    signal strength of a vehicle and an IP-RSU in a proactive way.
>>
>>    Vehicles can use the TCC as their Home Network having a home agent
>>    for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5213],
>>    so the TCC (or an MA inside the TCC) maintains the mobility
>>    information of vehicles for location management.  IP tunneling over
>>    the wireless link should be avoided for performance efficiency.
>>    Also, in vehicular networks, asymmetric links sometimes exist and
>>    must be considered for wireless communications such as V2V and V2I.
>>
>> >>>  This is all very informative text but does not state a problem. Is
>> there a
>> problem is left to be solved or are we assessing the applicability of
>> protocols? Could it for instance, forward point to issues discussed in
>> section
>> 5?
>>
>> <snip>
>>
>>    As shown in Figure 3, as internal networks, a vehicle's moving
>>    network and an EN's fixed network are self-contained networks having
>>    multiple subnets and having an edge router (e.g., IP-OBU and IP-RSU)
>>    for the communication with another vehicle or another EN.  The
>>    internetworking between two internal networks via V2I communication
>>    requires the exchange of the network parameters and the network
>>    prefixes of the internal networks.  For the efficiency, the network
>>    prefixes of the internal networks (as a moving network) in a vehicle
>>    need to be delegated and configured automatically.  Note that a
>>    moving network's network prefix can be called a Mobile Network Prefix
>>    (MNP) [OMNI].
>>
>> >>> Then again you=E2=80=99re overselling OMNI. MNP is originally define=
d here
>> https://datatracker.ietf.org/doc/html/rfc3963#section-2 and that=E2=80=
=99s a
>> reference
>> you can use normatively.
>>
>> <snip>
>>
>>    As shown in Figure 3, the addresses used for IPv6 transmissions over
>>    the wireless link interfaces for IP-OBU and IP-RSU can be either
>>    global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets can be
>>    routed within vehicular networks [OMNI].
>>
>> >>> Then again you=E2=80=99re overselling OMNI. There needs to  be a rou=
ting
>> protocol
>> like a MANET that will accept to carry the
>>  MNPs, and that must be implemented by the infra and both cars. The OMNI
>> spec
>>  is clear on that. This is why at first glance I see OMNI as a full mobi=
le
>>  router in a bump in the stack. Now what is the problem behind this? No
>> such
>>  protocol at IETF? Too many to choose from? No deployment?
>> <snip>
>>
>> When global IPv6 addresses
>>    are used, wireless interface configuration and control overhead for
>>    Duplicate Address Detection (DAD) [RFC4862] and Multicast Listener
>>    Discovery (MLD) [RFC2710][RFC3810] should be minimized to support V2I
>>    and V2X communications for vehicles moving fast along roadways; when
>>    ULAs and the OMNI interface are used, no DAD nor MLD messaging is
>>    needed.
>>
>> >>> Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it the no =
dad needed a
>> property
>> of injecting a BYOA in the fabric for an GUA MIP Home Address which is
>> known to
>> be unique at home? >>> OTOH, autoconf=E2=80=99ing a random ULA =E2=80=9C=
FD=E2=80=A6=E2=80=9Dprefix has
>> lesser
>> DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classic=
al
>> subnet. So
>> who says DAD isn=E2=80=99t required for OMNI ULA? >>> note that IMHO DAD=
 on
>> wireless is
>> a lot more harm than good, and I agree that with a good pseudo random
>> generator
>> the ULA has no chance to collision in the real world, as OMNI claims.
>> It=E2=80=99s just
>> that your argument here plays the other way, because there are less
>> random bits
>> (56)  in the ULA prefix than in the IID (62), and if one starts using mo=
re
>> prefix bits to be non-random, there will be a time when DAD on prefix is
>> needed.
>>
>> <snip>
>>
>>    Let us consider the upload/download time of a vehicle when it passes
>>    through the wireless communication coverage of an IP-RSU.  For a
>>    given typical setting where 1km is the maximum DSRC communication
>>    range [DSRC] and 100km/h is the speed limit in highway, the dwelling
>>    time can be calculated to be 72 seconds by dividing the diameter of
>>    the 2km (i.e., two times of DSRC communication range where an IP-RSU
>>    is located in the center of the circle of wireless communication) by
>>    the speed limit of 100km/h (i.e., about 28m/s).  For the 72 seconds,
>>    a vehicle passing through the coverage of an IP-RSU can upload and
>>    download data packets to/from the IP-RSU.
>>
>> <snip>
>>
>> 4.3.  V2V-based Internetworking
>>
>> >>> In this section it looks like the cars are in a stable line of sight
>> relationship. Which is probably fine for a platoon, but when you drive
>> along
>> with friends in different cars, you realize that the line of sight
>> assumption
>> does not stand over time. Soon enough, other cars meddle in, and possibl=
y
>> one
>> of the cars drives faster and too far ahead so you need the infra to
>> relay,
>> possibly over multiple infra hops.
>>
>> >>> so in this section, I=E2=80=99d expect to see a Vehicle communicatin=
g with
>> another
>> one and using either line of sight or V2V relaying but also using relay
>> via V2I
>> (multihop I2I not just hub and spoke V2I2V ), alternatively to together
>> for
>> redundancy. Is that part of the problem?
>>
>> >>> reading deeper section 5 I found excellent text on routing via V and
>> via I.
>> This tells that section 4 does not play a good role at justifying sectio=
n
>> 5.
>> Maybe keep section 4 for another doc?
>>
>> >>> What kind or reliability is required in a V2V use case? Do you think
>> ND can
>> handle it? Or MANET? What would be the assumption on L2 (roaming time,
>> unicast
>> vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3
>> redundancy?
>>
>> <snip>
>>
>> 5.  Problem Statement
>>
>> <snip>
>>
>>    In order to specify protocols using the architecture mentioned in
>>    Section 4.1, IPv6 core protocols have to be adapted to overcome
>>    certain challenging aspects of vehicular networking.  Since the
>>    vehicles are likely to be moving at great speed, protocol exchanges
>>    need to be completed in a time relatively short compared to the
>>    lifetime of a link between a vehicle and an IP-RSU, or between two
>>    vehicles.
>>
>> >>> Any order of magnitude?
>> >>> Can you indicate whether this already rules out certain procedures,
>> e.g.
>> DAD ?
>>
>>    The lifetime of a session varies depending on the session's type such
>>    as a web surfing, voice call over IP, and DNS query.  Regardless of a
>>    session's type, to guide all the IPv6 packets to their destination
>>    host, IP mobility should be supported for the session.
>>
>> >>> this seems to be for unicast when you know who to talk to. Is there =
a
>> need
>> some multicast groups like anybody around interested in topic blah like =
I
>> could
>> be multicasting the speed of vehicles coming the other way that I crosse=
d
>> recently, for use of vehicles that I=E2=80=99m crossing now, so they can=
 see a
>> slowdown
>> on advance
>>
>>    Thus, the time constraint of a wireless link has a major impact on
>>    IPv6 Neighbor Discovery (ND).  Mobility Management (MM) is also
>>    vulnerable to disconnections that occur before the completion of
>>    identity verification and tunnel management.  This is especially true
>>    given the unreliable nature of wireless communication.  This section
>>    presents key topics such as neighbor discovery and mobility
>>    management.
>>
>> >>> Only ND? What about the MANET?
>> >>> how fast should ND be to be suitable?
>> >>> is there also a bandwidth check? You can make things much faster if
>> you
>> dedicate a lot of spectrum to it. But that can also be a waste.
>>
>> 5.1.  Neighbor Discovery
>>
>> <snip>
>>
>>    The requirements for IPv6 ND for vehicular networks are efficient DAD
>>    and NUD operations.
>>
>> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast=
,
>> which
>> is a good idea in my book?
>>
>>  <snip>
>>
>>       This merging and partitioning should be considered for the
>>    IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAAC)
>>    [RFC4862].
>>
>> >>> Not lookup? Is it the intention to use IP unicast over MAC broadcast=
,
>> which
>> is a good idea in my book?
>>
>>  <snip>
>>
>>    Also, the partitioning of a VANET may make vehicles with the same
>>    prefix be physically unreachable.  Also, SLAAC needs to prevent IPv6
>>    address duplication due to the merging of VANETs.  According to the
>>    merging and partitioning, a destination vehicle (as an IPv6 host)
>>    needs to be distinguished as either an on-link host or an off-link
>>    host even though the source vehicle uses the same prefix as the
>>    destination vehicle.
>>
>> >>> should reference to draft-nordmark-intarea-ippl
>>
>>    To efficiently prevent IPv6 address duplication due to the VANET
>>    partitioning and merging from happening in vehicular networks, the
>>    vehicular networks need to support a vehicular-network-wide DAD by
>>    defining a scope that is compatible with the legacy DAD.  In this
>>    case, two vehicles can communicate with each other when there exists
>>    a communication path over VANET or a combination of VANETs and IP-
>>    RSUs, as shown in Figure 1.  By using the vehicular-network-wide DAD,
>>    vehicles can assure that their IPv6 addresses are unique in the
>>    vehicular network whenever they are connected to the vehicular
>>    infrastructure or become disconnected from it in the form of VANET.
>>
>> >>> Excellent
>>
>>    ND time-related parameters such as router lifetime and Neighbor
>>    Advertisement (NA) interval need to be adjusted for vehicle speed and
>>    vehicle density.  For example, the NA interval needs to be
>>    dynamically adjusted according to a vehicle's speed so that the
>>    vehicle can maintain its neighboring vehicles in a stable way,
>>    considering the collision probability with the NA messages sent by
>>    other vehicles.
>>
>> >>> Is that a problem or just an operational setting that needs to be
>> found?
>> >>> Do we need to reconsider the concepts of those timers?
>>
>> <snip>
>>
>>    Thus, in IPv6-based vehicular networking, IPv6 ND should have minimum
>>    changes for the interoperability with the legacy IPv6 ND used in the
>>    Internet, including the DAD and NUD operations.
>>
>> >>> I do not find the logical link with the text before, why is this a
>> =E2=80=9Cthus=E2=80=9D?
>> >>> why should the ND inside the VANET be constrained to be
>> interoperable? This
>> may place constraints on the solution.
>>
>> 5.1.1.  Link Model
>>
>>    A prefix model for a vehicular network needs to facilitate the
>>
>> >>> Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=80=9C=
prefix model=E2=80=9D.
>> >>> it would make this piece and the next should refer to
>> draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both
>> link
>> and subnet issues. The general ideas are the same, but the gory details
>> here
>> are slightly incorrect, like this notion of prefix model than comes out
>> of the
>> blue. The model is really the subnet model for the subnet associated to
>> P2MP.
>>
>>    communication between two vehicles with the same prefix regardless of
>>    the vehicular network topology as long as there exist bidirectional
>>    E2E paths between them in the vehicular network including VANETs and
>>    IP-RSUs.  This prefix model allows vehicles with the same prefix to
>>    communicate with each other via a combination of multihop V2V and
>>    multihop V2I with VANETs and IP-RSUs.  Note that the OMNI interface
>>    supports an NBMA link model where multihop V2V and V2I communications
>>    use each mobile node's ULAs without need for any DAD or MLD
>>    messaging.
>>
>> >>> again overselling OMNI.
>> >>> I kinda agree about the OMNI interface model, nothing against that.
>> But you
>> must see that there needs a lot more than what the OMNI interface to get
>> packets across V and I hops to the destination. Like routing ala MANET,
>> redundancy handling ala DetNet because it will be very lossy, path
>> management
>> ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND s=
o it does
>> not
>> solve the ND problems above.
>>
>>    IPv6 protocols work under certain assumptions that do not necessarily
>>    hold for vehicular wireless access link types other than OMNI/NBMA
>>    [VIP-WAVE][RFC5889]; the rest of this section discusses implications
>>    for those link types that do not apply when the OMNI/NBMA link model
>>
>> >>> again overselling OMNI.
>> >>> The keyword here is P2MP / NBMA, and OMNI is one interface that
>> accepts
>> that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already =
P2MP /
>> NBMA,
>> using routing to complete the partial mesh in P2MP. The text seems to
>> imply
>> that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI=
 is
>> loaded with
>> other stuff than a plain P2MP capable interface. And ND over P2MP is not
>> done
>> by OMNI, OMNI only makes classical ND worse and only works in a full
>> mesh. OTOH
>> RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work
>> very well
>> within an OMNI interface and solve those problems. >>> My point is that
>> you
>> need to tell the full story or refrain from entering solution space in
>> this doc
>>
>> <snip>
>>
>>    There is a relationship between a link and a prefix, besides the
>>    different scopes that are expected from the link-local and global
>>    types of IPv6 addresses.  In an IPv6 link, it is assumed that all
>>    interfaces which are configured with the same subnet prefix and with
>>    on-link bit set can communicate with each other on an IPv6 link.
>>
>> >>> not assumed; that=E2=80=99s what the onlink but set tells. The concl=
usion
>> should be
>> that the VANET cannot set the O bit.
>>
>>    However, the vehicular link model needs to define the relationship
>>    between a link and a prefix, considering the dynamics of wireless
>>    links and the characteristics of VANET.
>>
>> <snip>
>>
>>    From the previous observation, a vehicular link model should consider
>>    the frequent partitioning and merging of VANETs due to vehicle
>>    mobility.  Therefore, the vehicular link model needs to use an on-
>>    link prefix and off-link prefix according to the network topology of
>>    vehicles such as a one-hop reachable network and a multihop reachable
>>
>> >>> No, the once a node saw a O bit set that sticks even if it sees othe=
r
>> advertisements of the PIO with the O bit not set. >>> This is a global a=
nd
>> intrinsic property of the prefix (and an attack vector that could be
>> mentioned
>> in the sec section). >>> the VANET prefix must never come with the O bit
>> set.
>>
>> <snip>
>>
>>    network (or partitioned networks).  If the vehicles with the same
>>    prefix are reachable from each other in one hop, the prefix should be
>>    on-link.
>>
>> >>>> No, see above; but the router may redirect though it is really risk=
y
>> unless this is a stable situation like a parking place.
>>
>>    Thus, in IPv6-based vehicular networking, the vehicular link model
>>    should have minimum changes for interoperability with standard IPv6
>>    links in an efficient fashion to support IPv6 DAD, MLD and NUD
>>    operations.  When the OMNI NBMA link model is used, there are no link
>>    model changes nor DAD/MLD messaging required.
>>
>> >>>> again overselling OMNI.
>> >>>> You need a good P2MP subnet model with routing support when the mes=
h
>> is
>> partial. My company alone has been shipping million of nodes that build
>> subnets
>> of thousands, and that was done using IETF standards.
>>
>> <snip>
>>
>>    For vehicular networks with high mobility and density, the DAD needs
>>    to be performed efficiently with minimum overhead so that the
>>    vehicles can exchange a driving safety message (e.g., collision
>>    avoidance and accident notification) with each other with a short
>>    interval (e.g., 0.5 second) by a technical report from NHTSA
>>    (National Highway Traffic Safety Administration) [NHTSA-ACAS-Report].
>>    Such a driving safety message may include a vehicle's mobility
>>    information (i.e., position, speed, direction, and acceleration/
>>    deceleration).  The exchange interval of this message is 0.5 second,
>>    which is required to allow a driver to avoid a rear-end crash from
>>    another vehicle.
>>
>> >>> IPv6 over broadcast MAC (used to be called internet 0, 10+ years ago=
)
>> solves that MAC issue since there is no MAC.
>>
>> 5.1.3.  Routing
>>
>>    For multihop V2V communications in either a VANET or VANETs via IP-
>>    RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing protocol may
>>    be required to support both unicast and multicast in the links of the
>>    subnet with the same IPv6 prefix.  However, it will be costly to run
>>    both vehicular ND and a vehicular ad hoc routing protocol in terms of
>>    control traffic overhead [ID-Multicast-Problems].
>>
>> >>> we do that with IETF standards on battery operated devices already.
>> Using
>> RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve =
seen 30
>> hops in
>> meshes of thousands in the real world though it=E2=80=99s not the normal
>> operational
>> model, but can happen to maintain connectivity during the reboot of a
>> root) and
>> does not use broadcast. RPL was initially designed as a V2V2V protocol b=
ut
>> found its market on the IoT. I=E2=80=99m sure the protocol would gladly =
come back
>> to
>> its roots.
>>
>>    A routing protocol for a VANET may cause redundant wireless frames in
>>    the air to check the neighborhood of each vehicle and compute the
>>    routing information in a VANET with a dynamic network topology
>>    because the IPv6 ND is used to check the neighborhood of each
>>    vehicle.  Thus, the vehicular routing needs to take advantage of the
>>    IPv6 ND to minimize its control overhead.
>>
>> >>> A clean description of the interaction of RPL and RFC 8505 in our Io=
T
>> networks. Note that the speed of the PHY in VANET balanced the
>> instability of
>> the topology, and RPL still applies. Note also that RPL uses DV with a
>> routing
>> stretch in order to minimize the topology awareness that=E2=80=99s neede=
d in each
>> node,
>> which results in minimal signaling.
>>
>> 5.2.  Mobility Management
>>
>> <snip>
>>
>>    For a mobility management scheme in a shared link, where the wireless
>>    subnets of multiple IP-RSUs share the same prefix, an efficient
>>    vehicular-network-wide DAD is required.  If DHCPv6 is used to assign
>>    a unique IPv6 address to each vehicle in this shared link,
>>
>> >>> I would not use the term link, or shared. Maybe shared link -> domai=
n?
>> <snip>
>>
>> the DAD is
>>    not required.  On the other hand, for a mobility management scheme
>>    with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] and OMNI
>>    [OMNI]), DAD is not required because the IPv6 address of a vehicle's
>>    external wireless interface is guaranteed to be unique.
>>
>> >>> again overselling OMNI
>> >>> As I said earlier, this is wring there are (64*) more chances of a
>> collision in OMNI prefixes than in IPv6 IIDs. >>> OMNI prefixes can
>> collision,
>> home addresses that are unique on a home network cannot. >>> Now if both
>> the
>> OMNI prefix and the IID are good randoms, then obviously, the chances of
>> collisions round up to 0. >>> Collision is certainly not my worst fear.
>>
>>   There is a
>>    tradeoff between the prefix usage efficiency and DAD overhead.  Thus,
>>    the IPv6 address autoconfiguration for vehicular networks needs to
>>    consider this tradeoff to support efficient mobility management.
>>
>> >>> This is way too superficial and hides the reality of things.
>> - Using a VANET Infra prefix allows direct routability to the internet
>> which
>> BYOA does not since the BYOA is not topologically correct. Yes, it costs
>> a DAD
>> with classic ND, but it does not with RCF8505 and the draft fails to
>> mention
>> that. - A BYOA needs a tunnel home, and the node needs to know who is
>> reachable
>> inside the VANET and what is not to decide to tunnel or not; this is a
>> difficult problem (vs. control place overhead) that is not discussed her=
e.
>>
>> <snip>
>>
>>    For the case of a multihomed network, a vehicle can follow the first-
>>    hop router selection rule described in [RFC8028].  That is, the
>>    vehicle should select its default router for each prefix by
>>    preferring the router that advertised the prefix.
>>
>> >>> Still router discovery (in and out) must be very fast. Thing of the =
RA
>> intervale in MIPv6. Is that sufficient? Too expensive?
>>
>> <snip>
>>
>> 6.  Security Considerations
>> >>> Any discussion on the security of classical ND and other operational
>> issues
>> (rfc6583) ?
>>
>> <snip>
>>
>>    Security and privacy are paramount in V2I, V2V, and V2X networking.
>>    Vehicles and infrastructure must be authenticated in order to
>>    participate in vehicular networking.  Also, in-vehicle devices (e.g.,
>>    ECU) and a driver/passenger's mobile devices (e.g., smartphone and
>>    tablet PC) in a vehicle need to communicate with other in-vehicle
>>    devices and another driver/passenger's mobile devices in another
>>    vehicle, or other servers behind an IP-RSU in a secure way.  Even
>>    though a vehicle is perfectly authenticated and legitimate, it may be
>>    hacked for running malicious applications to track and collect its
>>    and other vehicles' information.  In this case, an attack mitigation
>>    process may be required to reduce the aftermath of malicious
>>    behaviors.
>>
>> >>> The section should mention that both with classical ND and BYOA,
>> addresses
>> can be impersonated, and RFC 8928 protects against that in both cases
>> while
>> maintaining privacy.
>>
>>    Even though vehicles can be authenticated with valid certificates by
>>    an authentication server in the vehicular cloud, the authenticated
>>
>> >>> Is PKI feasible (deploying it in every car?). Is it fast enough? Is =
it
>> really what IPWAVE thinks vehicle should use????? >>> e.g. why would one
>> need
>> to authenticate to a V2I network? >>> from the text earlier in the doc, =
it
>> seemed that what you really want is access that is fast to join, capable
>> of
>> offering the reachability you want, anonymous, and innocuous (cars can
>> not harm
>> one another).
>>
>>    vehicles may harm other vehicles, so their communication activities
>>    need to be logged in either a central way through a logging server
>>    (e.g., TCC) in the vehicular cloud or a distributed way (e.g.,
>>    blockchain [Bitcoin]) along with other vehicles or infrastructure.
>>    For the non-repudiation of the harmful activities of malicious nodes,
>>    a blockchain technology can be used [Bitcoin].  Each message from a
>>    vehicle can be treated as a transaction and the neighboring vehicles
>>    can play the role of peers in a consensus method of a blockchain
>>    [Bitcoin][Vehicular-BlockChain].  For a blockchain's efficient
>>    consensus in vehicular networks having fast moving vehicles, a new
>>    consensus algorithm needs to be developed or an existing consensus
>>    algorithm needs to be enhanced.
>>
>> >>> solution space; better express the  security needs since this is a P=
S.
>>
>> <snip>
>>
>>    To identify malicious vehicles among vehicles, an authentication
>>    method is required.
>>
>> >>> No. As said earlier a vehicle can be infected. You need
>> innocuousness.which
>> can come from things like isolation, zerotrust, and protocols that are
>> difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 i=
s
>> protected by construction, anonymous, and fast.
>>
>> <snip>
>>
>>    For the setup of a secure channel over IPsec or TLS, the multihop V2I
>>    communications over DSRC is required in a highway for the
>>    authentication by involving multiple intermediate vehicles as relay
>>    nodes toward an IP-RSU connected to an authentication server in the
>>    vehicular cloud.  The V2I communications over 5G V2X (or LTE V2X) is
>>    required to allow a vehicle to communicate directly with a gNodeB (or
>>    eNodeB) connected to an authentication server in the vehicular cloud.
>>
>> >>> solution space. Instead, you could mention that setting up secured
>> channels
>> between cars that cross one another might not complete in time to
>> establish the
>> communication channel, and that the innocuousness must come from
>> zerotrust in
>> the transactions between the cars.
>>    For the IPv6 ND, the DAD is required to ensure the uniqueness of the
>>    IPv6 address of a vehicle's wireless interface.
>>
>> >>> for classical ND (SLAAC) that=E2=80=99s true. That is not with RFC 8=
505,
>> since the
>> infra maintains a table of all addresses in use in the prefix and blocks
>> duplicates without the RFC 4862 DAD method. The stateful autoconf addres=
s
>> grant
>> is immediate.
>>
>>                                This DAD can be used
>>    as a flooding attack that uses the DAD-related ND packets
>>    disseminated over the VANET or vehicular networks.
>>
>> >>> also for DOS attacks. You can block a owner from using an address. A
>> reference to rfc6959 is much needed here.
>>
>> <snip>
>>
>>  This possibility
>>    indicates that the vehicles and IP-RSUs need to filter out suspicious
>>    ND traffic in advance.  Based on the SEND [RFC3971] mechanism, the
>>    authentication for routers (i.e., IP-RSUs) can be conducted by only
>>    selecting an IP-RSU that has a certification path toward trusted
>>    parties.  For authenticating other vehicles, the cryptographically
>>    generated address (CGA) can be used to verify the true owner of a
>>    received ND message, which requires to use the CGA ND option in the
>>    ND protocols.  For a general protection of the ND mechanism, the RSA
>>    Signature ND option can also be used to protect the integrity of the
>>    messages by public key signatures.  For a more advanced
>>    authentication mechanism, a distributed blockchain-based mechanism
>>    [Vehicular-BlockChain] can be used.
>>
>> >>> solution space. Again, the draft should focus on problems and needs.
>> The
>> problem here is that SEND is complex, and not implemented in the major
>> stack.
>> It relies on PKI for trusting the router. The V2I need is a zerotrust
>> model
>> where one V, the other local Vs, and the I, can help each other
>> anonymously and
>> harmlessly. <snip>
>>
>> 8.  Informative References
>>
>> >>> no normative reference?
>>
>> >>> no normative reference?
>>
>> <snip>
>>
>> Voila!
>>
>> Keep safe;
>>
>> Pascal
>>
>>
>>
>> _______________________________________________
>> its mailing list
>> its@ietf.org
>> https://www.ietf.org/mailman/listinfo/its
>>
>>

--000000000000fdb13405cb1011f7
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Pascal,<div>Thanks a lot for your help and confirmation.</=
div><div><br></div><div>Take care, too.</div><div><br></div><div>Best Regar=
ds,</div><div>Paul</div></div><br><div class=3D"gmail_quote"><div dir=3D"lt=
r" class=3D"gmail_attr">On Fri, Sep 3, 2021 at 1:23 PM Pascal Thubert (pthu=
bert) &lt;<a href=3D"mailto:pthubert@cisco.com">pthubert@cisco.com</a>&gt; =
wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0=
px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">



<div dir=3D"auto">
All good Paul,=C2=A0
<div><br>
</div>
<div>we=E2=80=99re done for this round. Good luck for the next steps!<br>
<br>
<div dir=3D"ltr">Take care,<br>
<div><br>
</div>
<div>Pascal</div>
</div>
<div dir=3D"ltr"><br>
<blockquote type=3D"cite">Le 3 sept. 2021 =C3=A0 05:22, Mr. Jaehoon Paul Je=
ong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" target=3D"_blank">jaehoon=
.paul@gmail.com</a>&gt; a =C3=A9crit=C2=A0:<br>
<br>
</blockquote>
</div>
<blockquote type=3D"cite">
<div dir=3D"ltr">=EF=BB=BF
<div dir=3D"ltr">Hi Pascal,
<div>Thanks=C2=A0for your help to improve this draft significantly.<br>
</div>
<div><br>
</div>
<div>I have included your suggested text in the revision (-23) as follows:<=
/div>
<div><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-veh=
icular-networking-23" target=3D"_blank">https://datatracker.ietf.org/doc/ht=
ml/draft-ietf-ipwave-vehicular-networking-23</a></div>
<div>----------------------------------------------------------------------=
------------------------------------------------------------------</div>
<div>Section 5.1.3. Routing<br>
...<br>
RPL [RFC6550] defines a routing protocol for low-power and<br>
lossy networks, which constructs and maintains Destination-Oriented<br>
Directed Acyclic Graphs (DODAGs) optimized by an Objective Function<br>
(OF). A defined OF provides route selection and optimization within<br>
an RPL topology. A node in a DODAG discovers and maintains the<br>
upward routes toward the root node of the DODAG. RPL uses a Distance<br>
Vector (DV) approach, with lazy maintenance and stretched anisotropic<br>
routing. It is well-designed to reduce the topological knowledge and<br>
routing state that needs to be exchanged. As a result, the routing<br>
protocol overhead is minimized, which allows either highly<br>
constrained stable networks or less constrained, highly dynamic<br>
networks. Refer to Appendix B for the detailed description of RPL for<br>
multihop V2X networking.<br>
<br>
An address registration extension for 6LoWPAN (IPv6 over Low-Power<br>
Wireless Personal Area Network) in [RFC8505] can support light-weight<br>
mobility for nodes moving through different parents. [RFC8505], as<br>
opposed to [RFC4861], is stateful and proactively installs the ND<br>
cache entries, which saves broadcasts and provides a deterministic<br>
presence information for IPv6 addresses. Mainly it updates the<br>
Address Registration Option (ARO) of ND defined in [RFC6775] to<br>
include a status field that can indicate the movement of a node and<br>
optionally a Transaction ID (TID) field, i.e., a sequence number that<br>
can be used to determine the most recent location of a node. Thus,<br>
RPL can use the information provided by the Extended ARO (EARO)<br>
defined in [RFC8505] to deal with a certain level of node mobility.<br>
When a leaf node moves to the coverage of another parent node, it<br>
should de-register its addresses to the previous parent node and<br>
register itself with a new parent node along with an incremented TID.<br>
</div>
<div>----------------------------------------------------------------------=
------------------------------------------------------------------</div>
<div><br>
</div>
<div>If you are satisfied with this revision, could you update</div>
<div>the status of INTDIR Last Call Review into Ready?<br>
</div>
<div><a href=3D"https://datatracker.ietf.org/doc/draft-ietf-ipwave-vehicula=
r-networking/" target=3D"_blank">https://datatracker.ietf.org/doc/draft-iet=
f-ipwave-vehicular-networking/</a><br>
</div>
<div><br>
</div>
<div>Carlos and Erik,</div>
<div>If Pascal confirms the readiness of this draft,</div>
<div>let&#39;s move it out to the next step.</div>
<div><br>
</div>
<div>Thanks.</div>
<div><br>
</div>
<div>Best Regards,</div>
<div>Paul</div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Fri, Sep 3, 2021 at 12:50 AM Pasca=
l Thubert (pthubert) &lt;<a href=3D"mailto:pthubert@cisco.com" target=3D"_b=
lank">pthubert@cisco.com</a>&gt; wrote:<br>
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">You did well Paul, but I wonder if the reader of section 5.1 r=
eally cares about the guts of the protocols (DIO messages, who cares?) vs. =
what the protocol is optimized for.<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">I had the same feeling about the next paragraph where you desc=
ribe 8505. While what you are saying is correct is that of interest for the=
 reader?
<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">The interesting piece IMHO is that 8505, as opposed to 4861, =
=C2=A0is stateful and proactively installs the ND cache entries, which save=
s broadcasts and provides a deterministic presence
 information for IPv6 addresses=E2=80=9D. This is what I=E2=80=99d like to =
see written there. For the RPL piece, if you want to summarize my text, ple=
ase insist on the fact that it=E2=80=99s =E2=80=9CDV, with lazy maintenance=
 and stretched anisotropic routing, all designed to reduce the topological
 knowledge and routing state that needs to be exchanged. As a result, the r=
outing protocol overhead is minimized, which allows either highly constrain=
ed stable networks or less constrained highly dynamic networks=E2=80=9D.<u>=
</u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0cm 0cm 0cm 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><span style=3D"=
font-size:11pt;font-weight:bold">From:</span></font></b> Mr. Jaehoon Paul J=
eong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" target=3D"_blank">jaehoo=
n.paul@gmail.com</a>&gt;
<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> jeudi 2 septembre 2021=
 17:30<br>
<b><span style=3D"font-weight:bold">To:</span></b> Pascal Thubert (pthubert=
) &lt;<a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisc=
o.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Cc:</span></b> <a href=3D"mailto:int-di=
r@ietf.org" target=3D"_blank">
int-dir@ietf.org</a>; Last Call &lt;<a href=3D"mailto:last-call@ietf.org" t=
arget=3D"_blank">last-call@ietf.org</a>&gt;;
<a href=3D"mailto:its@ietf.org" target=3D"_blank">its@ietf.org</a>; Russ Ho=
usley &lt;<a href=3D"mailto:housley@vigilsec.com" target=3D"_blank">housley=
@vigilsec.com</a>&gt;; CARLOS JESUS BERNARDOS CANO &lt;<a href=3D"mailto:cj=
bc@it.uc3m.es" target=3D"_blank">cjbc@it.uc3m.es</a>&gt;;
 Chris Shen &lt;<a href=3D"mailto:shenyiwen7@gmail.com" target=3D"_blank">s=
henyiwen7@gmail.com</a>&gt;; Mr. Jaehoon Paul Jeong &lt;<a href=3D"mailto:j=
aehoon.paul@gmail.com" target=3D"_blank">jaehoon.paul@gmail.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Subject:</span></b> Re: [ipwave] Intdir=
 last call review of draft-ietf-ipwave-vehicular-networking-20<u></u><u></u=
></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Hi Pascal,<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">I have reflected your comments on=C2=A0the revision:<u></u><u>=
</u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-ip=
wave-vehicular-networking-22" target=3D"_blank">https://datatracker.ietf.or=
g/doc/html/draft-ietf-ipwave-vehicular-networking-22</a><u></u><u></u></spa=
n></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Though the text provided by you is excellent, it is long, so I=
 place it on Appendix B:<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-ip=
wave-vehicular-networking-22#appendix-B" target=3D"_blank">https://datatrac=
ker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networking-22#appendix-B<=
/a><u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">In Section=C2=A05.1.3.=C2=A0 Routing, I explain RPL concisely =
along with pros and cons:<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-ip=
wave-vehicular-networking-22#section-5.1.3" target=3D"_blank">https://datat=
racker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networking-22#section-=
5.1.3</a><u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">The changes with my some editings look like the following:<u><=
/u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">--------------------------------------------------------------=
--------------------------------------------------------<u></u><u></u></spa=
n></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">5.1.3. Routing<br>
...<br>
RPL [RFC6550] defines a routing protocol for low-power and lossy networks, =
which constructs and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">maintains DODAGs optimized by an Objective Function (OF). A de=
fined OF provides route selection<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">and optimization within an RPL topology. A node in a DODAG use=
s DODAG Information Objects (DIOs)<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">messages to discover and maintain the upward routes toward the=
 root node. Refer to Appendix B for<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">the detailed description of RPL for multihop V2X networking.<b=
r>
...<br>
----------<br>
Appendix B. Support of Multihop V2X Networking<br>
...<br>
RPL is primarily designed to minimize the control plane activity, which is =
the relative amount of routing<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">protocol exchanges versus data traffic; this approach is benef=
icial for situations where the power and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">bandwidth are scarce (e.g., an IoT LLN where RPL is typically =
used today), but also in situations of<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">high relative mobility between the nodes in the network (also =
known as swarming, e.g., within a<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">variable set of vehicles with a similar global motion, or a va=
riable set of drones flying toward the same<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">direction).<br>
<br>
To reduce the routing exchanges, RPL leverages a Distance Vector approach, =
which does not need a<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">global knowledge of the topology, and only optimizes the route=
s to and from the root, allowing<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Peer-to-Peer (P2P) paths to be stretched. Although RPL install=
s its routes proactively, it only maintains<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">them lazily, that is, in reaction to actual traffic, or as a s=
low background activity. Additionally, RPL<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">leverages the concept of an objective function (called OF), wh=
ich allows to adapt the activity of the<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">routing protocol to use cases, e.g., type, speed, and quality =
of the radios. RPL does not need converge,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">and provides connectivity to most nodes most of the time. The =
default route toward the root is<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">maintained aggressively and may change while a packet progress=
es without causing loops, so the<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">packet will still reach the root. There are two modes for rout=
ing in RPL such as non-storing mode and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">storing mode. In non-storing mode, a node inside the mesh/swar=
m that changes its point(s) of<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">attachment to the graph informs the root with a single unicast=
 packet flowing along the default route,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">and the connectivity is restored immediately; this mode is pre=
ferable for use cases where Internet<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">connectivity is dominant. On the other hand, in storing mode, =
the routing stretch is reduced, for a<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">better P2P connectivity, while the Internet connectivity is re=
stored more slowly, during the time for<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">the DV operation to operate hop-by-hop. While an RPL topology =
can quickly scale up and down and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">fits the needs of mobility of vehicles, the total performance =
of the system will also depend on how<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">quickly a node can form an address, join the mesh (including A=
uthentication, Authorization, and<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Accounting (AAA)), and manage its global mobility to become re=
achable from another node outside<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">the mesh.<br>
...<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">--------------------------------------------------------------=
--------------------------------------------------------<u></u><u></u></spa=
n></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">If you=C2=A0have further comments, please let me know.<u></u><=
u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Thanks.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Best Regards,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Paul<u></u><u></u></span></font></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><u></u>=C2=A0<u></u></span></font></p>
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">On Thu, Sep 2, 2021 at 3:49 PM Pascal Thubert (pthubert) &lt;<=
a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisco.com</=
a>&gt; wrote:<u></u><u></u></span></font></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0c=
m 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Hello Paul<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">This is absolutely excellent. I=E2=80=99m very happy will all =
the changes and your attached pdf made my life as a reviewer a lot simpler.
<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">This is really a great way of progressing together. Many thank=
s for that!<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">I=E2=80=99m all good but for a little snippet in the new text =
which is actually incorrect, and denotes a usual misunderstanding of RPL th=
at your doc may help correct for the future:<u></u><u></u></span></font></p=
>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=E2=80=9C<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Although RPL can be used in IPv6-based veh=
icular networks, it is primarily designed for lossy</span></font><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">networks, which puts energy efficiency fir=
st. In addition, the topology it considers may not</span></font><u></u><u><=
/u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">quickly scale up and down for IPv6-based v=
ehicular networks, since the mobility of vehicles is</span></font><u></u><u=
></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">much more diverse with a high speed, so it=
 can frequently alter a tree-like topology formed by</span></font><u></u><u=
></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">RPL, which may cause network fragmentation=
 and merging with more control traffic</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=E2=80=9C</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">The roots of my contribution to RPL are in=
 vehicular networks, exactly the use case you describe. Based on that exper=
ience (including some actual test with NASA)
 I=E2=80=99d change the text above with:</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=E2=80=9C</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">RPL is primarily designed to minimize the =
control plane activity, that is the relative amount of routing protocol exc=
hanges vs. data traffic; this approach is
 beneficial for situations where the power and bandwidth are scarce (e.g., =
an IoT LLN where RPL is typically used today), but also in situations of hi=
gh relative mobility between the nodes in the network (aka swarming, e.g., =
within a variable set of vehicles
 with a similar global motion, or a toon of drones).</span></font><u></u><u=
></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">To reduce the routing exchanges, RPL lever=
ages a Distance Vector approach, which does not need a global knowledge of =
the topology, and only optimizes the routes
 to and from the root, allowing P2P paths to be stretched. Although RPL ins=
talls its routes proactively, it only maintains them lazily, in reaction to=
 actual traffic, or as a slow background activity. Additionally, RPL levera=
ges the concept of an objective
 function, which allows to adapt the activity of the routing protocol to th=
e use case, e.g., type, speed, and quality of the radios. RPL does not need=
 converge, and provides connectivity to most nodes most of the time. The de=
fault route towards the Root is
 maintained aggressively and may change while a packet progresses without c=
ausing loops, so the packet will still reach the root. In non-storing mode,=
 a node inside the mesh/swarm that changes its point(s) of attachment to th=
e graph informs the root with a
 single unicast packet the flows along the default route, and the connectiv=
ity is restored immediately; this mode is preferable for use cases where in=
ternet connectivity is dominant. OTOH, in storing mode, the routing stretch=
 is reduced, for a better P2P connectivity,
 while the internet connectivity is restored more slowly, time for the DV o=
peration to operate hop-by-hop. While a RPL topology can quickly scale up a=
nd down and fits the needs of mobility of vehicles, the total performance o=
f the system will also depend on
 how quickly a node can form an address, join the mesh (including AAA), and=
 manage its global mobility to become reachable from outside the mesh.</spa=
n></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=E2=80=9C</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Otherwise, all good!</span></font><u></u><=
u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Take care,</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">=C2=A0</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"ArialMT"><span style=3D"fon=
t-size:11pt;font-family:ArialMT">Pascal</span></font><u></u><u></u></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0cm 0cm 0cm 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><span style=3D"=
font-size:11pt;font-weight:bold">From:</span></font></b> Mr. Jaehoon Paul J=
eong &lt;<a href=3D"mailto:jaehoon.paul@gmail.com" target=3D"_blank">jaehoo=
n.paul@gmail.com</a>&gt;
<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> lundi 30 ao=C3=BBt 202=
1 15:12<br>
<b><span style=3D"font-weight:bold">To:</span></b> Pascal Thubert (pthubert=
) &lt;<a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisc=
o.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Cc:</span></b> <a href=3D"mailto:int-di=
r@ietf.org" target=3D"_blank">
int-dir@ietf.org</a>; Last Call &lt;<a href=3D"mailto:last-call@ietf.org" t=
arget=3D"_blank">last-call@ietf.org</a>&gt;;
<a href=3D"mailto:draft-ietf-ipwave-vehicular-networking.all@ietf.org" targ=
et=3D"_blank">
draft-ietf-ipwave-vehicular-networking.all@ietf.org</a>; <a href=3D"mailto:=
its@ietf.org" target=3D"_blank">
its@ietf.org</a>; Russ Housley &lt;<a href=3D"mailto:housley@vigilsec.com" =
target=3D"_blank">housley@vigilsec.com</a>&gt;; CARLOS JESUS BERNARDOS CANO=
 &lt;<a href=3D"mailto:cjbc@it.uc3m.es" target=3D"_blank">cjbc@it.uc3m.es</=
a>&gt;; skku-iotlab-members &lt;<a href=3D"mailto:skku-iotlab-members@googl=
egroups.com" target=3D"_blank">skku-iotlab-members@googlegroups.com</a>&gt;=
;
 Chris Shen &lt;<a href=3D"mailto:shenyiwen7@gmail.com" target=3D"_blank">s=
henyiwen7@gmail.com</a>&gt;; Mr. Jaehoon Paul Jeong &lt;<a href=3D"mailto:j=
aehoon.paul@gmail.com" target=3D"_blank">jaehoon.paul@gmail.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Subject:</span></b> Re: [ipwave] Intdir=
 last call review of draft-ietf-ipwave-vehicular-networking-20<u></u><u></u=
></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Hi Pascal,<u></u><u></u></span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Here is the revision (-21) of IPWAVE PS Draft:<u></u><u></u></=
span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt"><a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-ip=
wave-vehicular-networking-21" target=3D"_blank">https://datatracker.ietf.or=
g/doc/html/draft-ietf-ipwave-vehicular-networking-21</a><u></u><u></u></spa=
n></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">I attach the revision letter to show how I have addressed your=
 comments on the revision.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Chris and I have worked for this revision together.<u></u><u><=
/u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">If you have further comments, please let me know.<u></u><u></u=
></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Thanks.<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Best Regards,<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Paul<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">=C2=A0<u></u><u></u></span></font></p>
<div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">On Fri, Jun 18, 2021 at 4:42 PM Pascal Thubert via Datatracker=
 &lt;<a href=3D"mailto:noreply@ietf.org" target=3D"_blank">noreply@ietf.org=
</a>&gt; wrote:<u></u><u></u></span></font></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0c=
m 5pt 4.8pt">
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11pt">Reviewer: Pascal Thubert<br>
Review result: Not Ready<br>
<br>
Dear authors<br>
<br>
In summary:<br>
<br>
I read a number of very good drafts collated in one, from the use cases tha=
t<br>
very complete and ready to publish, to the architecture and protocol soluti=
on<br>
in section 4 that would require more work for completeness.<br>
<br>
There are multiple instances in the use cases where protocols are listed co=
ming<br>
out of the blue, e.g., the references to OMNI that seem artificially spread=
<br>
regardless of the context of the section. OMNI is used throughout, both as =
an<br>
open ended toolbox, and as a carpet under which all problems can be hidden.=
<br>
<br>
Reading this doc, OMNI shows as an interface to a software mobile router, w=
ith<br>
multiple of the device physical interfaces connected to the mobile router. =
This<br>
makes the stack very simple as the complexity moves to the router. But now =
you<br>
have to implement the router. Presented as that, the OMNI router deserves i=
ts<br>
name, it=E2=80=99s indeed very rich; it seems to cover all forms of MANET (=
many to<br>
choose from) and NEMO (and all the MIP protocol family across address<br>
families), all the possible radio interfaces on which the ND problems go aw=
ay<br>
by magic, and whatever else you want to put in there. Is that the intention=
?<br>
<br>
Instead of referring to OMNI for virtually anything, the doc should refer t=
o<br>
MANET for MANET things (like BYOD), NEMO for NEMO things (like MNP),<br>
draft-nordmark-intarea-ippl for split subnets, and<br>
draft-thubert-6man-ipv6-over-wireless for P2MP/NBMA link and subnet models.=
 And<br>
then you can say that all those components can be plugged in the OMNI route=
r,<br>
and you can discuss which MANET and which MIP you want, including using OMN=
I=E2=80=99s<br>
built in mobility.<br>
<br>
Note that my objections are not against the OMNI design, it might be the<br=
>
perfect thing and I am already aware of use cases that could be served by a=
<br>
P2MP interface like OMNI in conjunction with RFC8505 on the P2P subinterfac=
es<br>
(recycling the high level design we=E2=80=99ve been shipping for IPv4 / fra=
me relay for<br>
the last 30 years). My objection is of the way the draft uses [OMNI] as the=
<br>
magic wand that solves all the problems when what you really do is throw th=
em<br>
over the fence. I=E2=80=99d rather you focus on problems and use cases, for=
 which<br>
there=E2=80=99s excellent text, and indicate what needs to be done without =
making<br>
assumption on how the needful things will be solved.<br>
<br>
In agreement with a discussion on the 6MAN list, I=E2=80=99d suggest to spl=
it, keep all<br>
that=E2=80=99s use case and problem description and ship it, remove referen=
ces to<br>
protocols envisioned in the solution, and start the work on architecture of=
 the<br>
solution and the protocol applicability statements separately. An alternate=
<br>
would be to centralize the discussion on protocols to annex, and explain th=
at<br>
protocol A or B could be envisioned in solution space because to over this =
gap<br>
or implement that function.<br>
<br>
In any fashion, the current text is not ready for publication as applicabil=
ity<br>
statement, architecture and or/solution, so the related work should be remo=
ved<br>
from the main text. But I find it mostly ready for use case and problem<br>
statement, more below.<br>
<br>
Review:<br>
<br>
Abstract<br>
<br>
=C2=A0 =C2=A0This document discusses the problem statement and use cases of=
<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for Intelligent Transportation=
<br>
=C2=A0 =C2=A0Systems (ITS).<br>
<br>
&gt;&gt;&gt; The document goes beyond that; there was actually a thread at =
6MAN where<br>
Bob Hinden said =E2=80=9C This document says it is a problem statement, but=
 then<br>
becomes a solution document.=C2=A0 =C2=A0Might be better to cut it down to =
only the<br>
problem statement part. =E2=80=9C &gt;&gt;&gt; Would you consider doing thi=
s? If not, why? Note:<br>
you may want to respond on 6MAN as well. &gt;&gt;&gt; &gt;&gt;&gt;I would h=
ave thought that the<br>
traditional steps of problem statement and applicability statement of exist=
ing<br>
work could be expected from IPWAVE too. &gt;&gt;&gt; Please clarify the ste=
ps that you<br>
intend to follow next with this work.<br>
<br>
&lt;snip&gt;<br>
<br>
1.=C2=A0 Introduction<br>
<br>
&gt;&gt;&gt; Very readable and informative section, many thanks!<br>
<br>
=C2=A0 =C2=A0Along with these WAVE standards and C-V2X standards, regardles=
s of a<br>
=C2=A0 =C2=A0wireless access technology under the IP stack of a vehicle, ve=
hicular<br>
=C2=A0 =C2=A0networks can operate IP mobility with IPv6 [RFC8200] and Mobil=
e IPv6<br>
=C2=A0 =C2=A0protocols (e.g., Mobile IPv6 (MIPv6) [RFC6275], Proxy MIPv6 (P=
MIPv6)<br>
=C2=A0 =C2=A0[RFC5213], Distributed Mobility Management (DMM) [RFC7333], Lo=
cator/<br>
=C2=A0 =C2=A0ID Separation Protocol (LISP) [RFC6830BIS], and Asymmetric Ext=
ended<br>
=C2=A0 =C2=A0Route Optimization (AERO) [RFC6706BIS]).<br>
<br>
&gt;&gt;&gt; NEMO (RFC 3963) is not cited. Any reason why the vehicle would=
 not<br>
transport a network?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0This document describes use cases and a problem statement abou=
t<br>
=C2=A0 =C2=A0IPv6-based vehicular networking for ITS, which is named IPv6 W=
ireless<br>
=C2=A0 =C2=A0Access in Vehicular Environments (IPWAVE).=C2=A0 First, it int=
roduces the<br>
=C2=A0 =C2=A0use cases for using V2V, V2I, and V2X networking in ITS.=C2=A0=
 Next, for<br>
=C2=A0 =C2=A0IPv6-based vehicular networks, it makes a gap analysis of curr=
ent<br>
=C2=A0 =C2=A0IPv6 protocols (e.g., IPv6 Neighbor Discovery, Mobility Manage=
ment,<br>
=C2=A0 =C2=A0and Security &amp; Privacy), and then enumerates requirements =
for the<br>
=C2=A0 =C2=A0extensions of those IPv6 protocols, which are tailored to IPv6=
-based<br>
=C2=A0 =C2=A0vehicular networking.=C2=A0 Thus, this document is intended to=
 motivate<br>
=C2=A0 =C2=A0development of key protocols for IPWAVE.<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
2.=C2=A0 Terminology<br>
<br>
&gt;&gt;&gt;<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0o=C2=A0 IP-OBU: &quot;Internet Protocol On-Board Unit&quot;: A=
n IP-OBU denotes a<br>
=C2=A0 =C2=A0 =C2=A0 computer situated in a vehicle (e.g., car, bicycle, au=
tobike,<br>
=C2=A0 =C2=A0 =C2=A0 motor cycle, and a similar one) and a device (e.g., sm=
artphone and<br>
=C2=A0 =C2=A0 =C2=A0 IoT device).=C2=A0 It has at least one IP interface th=
at runs in IEEE<br>
=C2=A0 =C2=A0 =C2=A0 802.11-OCB and has an &quot;OBU&quot; transceiver.=C2=
=A0 Also, it may have an IP<br>
=C2=A0 =C2=A0 =C2=A0 interface that runs in Cellular V2X (C-V2X) [TS-23.285=
-3GPP]<br>
=C2=A0 =C2=A0 =C2=A0 [TR-22.886-3GPP][TS-23.287-3GPP].=C2=A0 See the defini=
tion of the term<br>
=C2=A0 =C2=A0 =C2=A0 &quot;OBU&quot; in [RFC8691].<br>
<br>
&gt;&gt;&gt; Can that be a router connecting multiple computers?<br>
<br>
&lt;snip&gt;<br>
<br>
3.=C2=A0 Use Cases<br>
<br>
&gt;&gt;&gt; This is another great read and an enlightening section. Maybe =
mention in<br>
the abstract that the doc also covers use cases?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Although a Layer-2 solution can provide a support for multihop=
<br>
=C2=A0 =C2=A0communications in vehicular networks, the scalability issue re=
lated<br>
=C2=A0 =C2=A0to multihop forwarding still remains when vehicles need to<br>
=C2=A0 =C2=A0disseminate or forward packets toward multihop-away destinatio=
ns.=C2=A0 In<br>
=C2=A0 =C2=A0addition, the IPv6-based approach for V2V as a network layer p=
rotocol<br>
=C2=A0 =C2=A0can accommodate multiple radio technologies as MAC protocols, =
such as<br>
=C2=A0 =C2=A05G V2X and DSRC.=C2=A0 Therefore, the existing IPv6 protocol c=
an be<br>
=C2=A0 =C2=A0augmented through the addition of an Overlay Multilink Network=
 (OMNI)<br>
=C2=A0 =C2=A0Interface [OMNI] and/or protocol changes in order to support b=
oth<br>
=C2=A0 =C2=A0wireless single-hop/multihop V2V communications and multiple r=
adio<br>
=C2=A0 =C2=A0technologies in vehicular networks.=C2=A0 In such a way, vehic=
les can<br>
=C2=A0 =C2=A0communicate with each other by V2V communications to share eit=
her an<br>
=C2=A0 =C2=A0emergency situation or road hazard in a highway having multipl=
e kinds<br>
=C2=A0 =C2=A0of radio technologies, such as 5G V2X and DSRC.<br>
<br>
&gt;&gt;&gt; This text appears in the middle of high level use case, with a=
 crude list<br>
of protocols; this is not a place for it<br>
<br>
&gt;&gt;&gt; On a 6MAN Thread, Brian Carpenter said that the above:<br>
=E2=80=9C<br>
is of concern regardless of the mention of OMNI. Does it mean &quot;can be&=
quot; or<br>
&quot;needs to be&quot;? This paragraph seems like a very short summary of =
a big problem<br>
area. At the end of page 13 there is some related discussion, which mention=
s<br>
RPL as part of the solution (good choice, IMHO) but again seems to depend o=
n<br>
OMNI. I don&#39;t think the fix of simply removing references to OMNI works=
,<br>
because it would leave a gap. In an informational document, that is not a<b=
r>
formal problem but as far as this draft describes architecture, I don&#39;t=
 think<br>
that big a gap is reasonable. &quot;OMNI&quot; is mentioned more than 20 ti=
mes in the<br>
document. There are also several references to AERO, which is strongly<br>
associated with OMNI. =E2=80=9C &gt;&gt;&gt; I agree with Brian. Here the d=
ocument seems to be<br>
mixing solution with problem and putting the cart before the horse. My<br>
recommendation is to stick to what needs to be done that IPv6 does not do y=
et<br>
-the reqs and gaps-; but the doc should not step in the how things will be =
done<br>
unless the group already decided to do it. The logical next steps to a PS a=
re<br>
an applicability statement of existing work, and if the gaps cannot be fill=
ed,<br>
there may be one or more WG chartered to fill those gaps.<br>
<br>
&gt;&gt;&gt; I=E2=80=99d still be happy to see an annex with leads on where=
 the solution might<br>
come from like RFC 8691 does.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2I communications in a highway where RSUs a=
re<br>
=C2=A0 =C2=A0sparsely deployed, so a vehicle can reach the wireless coverag=
e of an<br>
=C2=A0 =C2=A0RSU through the multihop data forwarding of intermediate vehic=
les.<br>
=C2=A0 =C2=A0Thus, IPv6 needs to be extended for multihop V2I communication=
s.<br>
<br>
&gt;&gt;&gt; Note that I have no clue on how well OMNI applies in that spac=
e, maybe it<br>
does very well; but here it comes out of the blue with no justification. If=
 you<br>
mention OMNI you need to detail what it is and which of the V2V=C2=A0 probl=
ems you<br>
expect it to solve. But then, that=E2=80=99s beyond the scope of a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented through the addit=
ion of<br>
=C2=A0 =C2=A0an OMNI interface and/or protocol changes in order to support<=
br>
=C2=A0 =C2=A0wireless multihop V2X (or V2I2X) communications in an urban ro=
ad<br>
=C2=A0 =C2=A0network where RSUs are deployed at intersections, so a vehicle=
 (or a<br>
=C2=A0 =C2=A0pedestrian&#39;s smartphone) can reach the wireless coverage o=
f an RSU<br>
=C2=A0 =C2=A0through the multihop data forwarding of intermediate vehicles =
(or<br>
=C2=A0 =C2=A0pedestrians&#39; smartphones).=C2=A0 Thus, IPv6 needs to be ex=
tended for<br>
=C2=A0 =C2=A0multihop V2X (or V2I2X) communications.<br>
<br>
&gt;&gt;&gt; Please be more specific on what the missing functions are and =
whether they<br>
are missing from the stack development standpoint or if there=E2=80=99s wor=
k needed<br>
from the IETF. 1)=C2=A0 =C2=A0 =C2=A0 If something is really missing in our=
 specs, the text to<br>
prove from the use case above is missing 2)=C2=A0 =C2=A0 =C2=A0 how OMNI se=
rves the use case<br>
could be elaborated in an applicability statement of OMNI for V2xyz, but it=
 is<br>
a bit blunt to present it as panacea when the problems to be solved are not=
<br>
listed. 3)=C2=A0 =C2=A0 =C2=A0 If you look at it, OMNI seems like a softwar=
e mobile router<br>
within a bump in the stack. Can that become too big?<br>
<br>
&gt;&gt;&gt; my view is that the text above and the similar occasions shoul=
d be replaced<br>
by something like :<br>
<br>
=C2=A0 =C2=A0The existing IPv6 protocol must be augmented to provide the fo=
llowing<br>
=C2=A0 =C2=A0functions: 1) =E2=80=A6<br>
<br>
&gt;&gt;&gt; and / or something like:<br>
<br>
=C2=A0 =C2=A0In addition to the IPv6 node requirements [RFC 8504], the IPv6=
 protocol<br>
=C2=A0 =C2=A0stack for use in a vehicle must support 1) RFC blah, 2) =E2=80=
=A6<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To support applications of these V2X use cases, the functions =
of IPv6<br>
=C2=A0 =C2=A0such as VND, VMM, and VSP are prerequisites for IPv6-based pac=
ket<br>
=C2=A0 =C2=A0exchange, transport-layer session continuity, and secure, safe=
<br>
=C2=A0 =C2=A0communication between a vehicle and a pedestrian either direct=
ly or<br>
=C2=A0 =C2=A0indirectly via an IP-RSU.<br>
<br>
&gt;&gt;&gt; =E2=80=9Cthe functions of IPv6 such as VND, VMM, and VSP=E2=80=
=9D does not parse. There=E2=80=99s<br>
no IPv6 reference that provides those functions. If the intention is to say=
<br>
that there=E2=80=99s stuff to add to IPv6 to support, like, say,=C2=A0 VND,=
 then this<br>
document fails to define how an IPv6 VND should behave, though it=E2=80=99s=
 precisely<br>
what I=E2=80=99d expect from a problem statement.<br>
<br>
&lt;snip&gt;<br>
<br>
4.=C2=A0 Vehicular Networks<br>
<br>
&gt;&gt;&gt; What is the purpose of section 4 as a whole, problem statement=
 or<br>
applicability statement of the listed protocols? In the former case what=E2=
=80=99s the<br>
problem? In the latter case it is incomplete and needs to be exported to an=
<br>
applicability statement doc with all the possible technologies evaluated.<b=
r>
<br>
=C2=A0 =C2=A0This section describes an example vehicular network architectu=
re<br>
=C2=A0 =C2=A0supporting V2V, V2I, and V2X communications in vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt; I read this as presenting a context to explain what the proble=
ms are<br>
instead of presenting the IPVAWE =E2=80=9Carchitecture=E2=80=9D. Maybe usin=
g the term<br>
=E2=80=9CArchitecture=E2=80=9D here is misleading and led to Bob=E2=80=99s =
comment.<br>
<br>
&lt;snip&gt;<br>
<br>
4.1.=C2=A0 Vehicular Network Architecture<br>
<br>
=C2=A0 =C2=A0Figure 1 shows an example vehicular network architecture for V=
2I and<br>
=C2=A0 =C2=A0V2V in a road network [OMNI].<br>
<br>
a.=C2=A0 =C2=A0 =C2=A0 Is using OMNI a decision that the WG made for the fu=
ture work ? what<br>
does it do and what does it not do? b.=C2=A0 =C2=A0 =C2=A0 Is there work le=
ft to be done? Who<br>
will do that work? Or is it the expectation that OMNI has it all defined<br=
>
already?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An existing network architecture (e.g., an IP-based aeronautic=
al<br>
=C2=A0 =C2=A0network architecture [OMNI][UAM-ITS], a network architecture o=
f<br>
=C2=A0 =C2=A0PMIPv6 [RFC5213], and a low-power and lossy network architectu=
re<br>
=C2=A0 =C2=A0[RFC6550]) can be extended to a vehicular network architecture=
 for<br>
=C2=A0 =C2=A0multihop V2V, V2I, and V2X, as shown in Figure 1.=C2=A0 In a h=
ighway<br>
=C2=A0 =C2=A0scenario, a vehicle may not access an RSU directly because of =
the<br>
=C2=A0 =C2=A0distance of the DSRC coverage (up to 1 km).=C2=A0 For example,=
 the OMNI<br>
=C2=A0 =C2=A0interface and/or RPL (IPv6 Routing Protocol for Low-Power and =
Lossy<br>
=C2=A0 =C2=A0Networks) [RFC6550] can be extended to support a multihop V2I =
since a<br>
=C2=A0 =C2=A0vehicle can take advantage of other vehicles as relay nodes to=
 reach<br>
=C2=A0 =C2=A0the RSU.=C2=A0 Also, RPL can be extended to support both multi=
hop V2V and<br>
=C2=A0 =C2=A0V2X in the similar way.<br>
<br>
&gt;&gt;&gt; all this could fit well in annex; anyway you need to explain w=
hat you<br>
expect the protocols to do and which extension is needed. In the case of RP=
L at<br>
least you indicate that it would do routing, but not why you cannot use it =
of<br>
the shelf; for OMNI, what you expect is less clear, though there=E2=80=99s =
text<br>
elsewhere about the many radio interfaces that could be used for the purpos=
e,<br>
and the text in the UAM below that is enlightening.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 To support not only the mobil=
ity<br>
=C2=A0 =C2=A0management of the UAM end systems, but also the multihop and<b=
r>
=C2=A0 =C2=A0multilink communications of the UAM interfaces, the UAM end sy=
stems<br>
=C2=A0 =C2=A0can employ an Overlay Multilink Network (OMNI) interface [OMNI=
] as a<br>
=C2=A0 =C2=A0virtual Non-Broadcast Multiple Access (NBMA) connection to a s=
erving<br>
=C2=A0 =C2=A0ground domain infrastructure.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; when connecting to a MANET it needs support for that MANET. The t=
ext<br>
above seems to imply that is solves everything in V2xyz like magic; reminds=
 me<br>
of the IPv6 multicast abstraction that was supposed to solve the broadcast<=
br>
problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 This infrastructure can be configured<br>
=C2=A0 =C2=A0over the underlying data links.=C2=A0 The OMNI interface and i=
ts link<br>
=C2=A0 =C2=A0model provide a means of multilink, multihop and mobility<br>
=C2=A0 =C2=A0coordination to the legacy IPv6 ND messaging [RFC4861] accordi=
ng to<br>
=C2=A0 =C2=A0the NBMA principle.=C2=A0 Thus, the OMNI link model can suppor=
t efficient<br>
=C2=A0 =C2=A0UAM internetworking services without additional mobility messa=
ging,<br>
=C2=A0 =C2=A0and without any modification to the IPv6 ND messaging services=
 or<br>
=C2=A0 =C2=A0link model.<br>
<br>
&gt;&gt;&gt; Again, what is the expectation for OMNI? As an overlay it requ=
ires an<br>
underlay; the text above seems to imply that is solves everything in V2xyz =
like<br>
magic; that would be a stretch, that reminds me of IPv6 multicast that was<=
br>
supposed to solve the broadcast problem and ended up worsening it.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Multiple vehicles under the coverage of an RSU share a prefix =
just as<br>
=C2=A0 =C2=A0mobile nodes share a prefix of a Wi-Fi access point in a wirel=
ess<br>
=C2=A0 =C2=A0LAN.=C2=A0 This is a natural characteristic in infrastructure-=
based<br>
=C2=A0 =C2=A0wireless networks.=C2=A0 For example, in Figure 1, two vehicle=
s (i.e.,<br>
=C2=A0 =C2=A0Vehicle2, and Vehicle5) can use Prefix 1 to configure their IP=
v6<br>
=C2=A0 =C2=A0global addresses for V2I communication.=C2=A0 Alternatively, m=
obile nodes<br>
=C2=A0 =C2=A0can employ an OMNI interface and use their own IPv6 Unique Loc=
al<br>
=C2=A0 =C2=A0Addresses (ULAs) [RFC4193] over the wireless network without<b=
r>
=C2=A0 =C2=A0requiring the messaging of IPv6 Stateless Address Autoconfigur=
ation<br>
=C2=A0 (SLAAC) [RFC4862], which uses an on-link prefix provided by the<br>
=C2=A0 =C2=A0(visited) wireless LAN; this technique is known as &quot;Bring=
-Your-Own-<br>
=C2=A0 =C2=A0Addresses&quot;.<br>
<br>
&gt;&gt;&gt;=C2=A0 Is OMNI the only way to &quot;Bring-Your-Own-Addresses=
=E2=80=9D? Else the text could be<br>
more generic, at least use e.g., like the ref to AERO later. &gt;&gt;&gt; W=
hat are the<br>
implications / limitations of doing that =E2=80=93 like they can do line of=
 sight V2V<br>
but not reach the internet, or the need of=C2=A0 a local MANET / RPL that w=
ill<br>
accept to route those addresses, or the security / address ownership valida=
tion<br>
issues ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0A single subnet prefix announced by an RSU can span multiple v=
ehicles<br>
=C2=A0 =C2=A0in VANET.=C2=A0 For example, in Figure 1, for Prefix 1, three =
vehicles<br>
=C2=A0 =C2=A0(i.e., Vehicle1, Vehicle2, and Vehicle5) can construct a conne=
cted<br>
=C2=A0 =C2=A0VANET.=C2=A0 Also, for Prefix 2, two vehicles (i.e., Vehicle3 =
and<br>
=C2=A0 =C2=A0Vehicle6) can construct another connected VANET, and for Prefi=
x 3,<br>
=C2=A0 =C2=A0two vehicles (i.e., Vehicle4 and Vehicle7) can construct anoth=
er<br>
=C2=A0 =C2=A0connected VANET.=C2=A0 Alternatively, each vehicle could emplo=
y an OMNI<br>
=C2=A0 =C2=A0interface with their own ULAs such that no topologically-orien=
ted<br>
=C2=A0 =C2=A0subnet prefixes need be announced by the RSU.<br>
<br>
&gt;&gt;&gt;=C2=A0 same as above. This seems to restate the same thing, der=
ive an address<br>
from a topologically correct prefix or use your own with limitations to be<=
br>
described.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For IPv6 packets transported over IEEE 802.11-OCB, [RFC8691]<b=
r>
=C2=A0 =C2=A0specifies several details, including Maximum Transmission Unit=
 (MTU),<br>
=C2=A0 =C2=A0frame format, link-local address, address mapping for unicast =
and<br>
=C2=A0 =C2=A0multicast, stateless autoconfiguration, and subnet structure.=
=C2=A0 An<br>
=C2=A0 =C2=A0Ethernet Adaptation (EA) layer is in charge of transforming so=
me<br>
=C2=A0 =C2=A0parameters between the IEEE 802.11 MAC layer and the IPv6 netw=
ork<br>
=C2=A0 =C2=A0layer, which is located between the IEEE 802.11-OCB&#39;s logi=
cal link<br>
=C2=A0 =C2=A0control layer and the IPv6 network layer.=C2=A0 This IPv6 over=
 802.11-OCB<br>
=C2=A0 =C2=A0can be used for both V2V and V2I in IPv6-based vehicular netwo=
rks.<br>
<br>
&gt;&gt;&gt;=C2=A0 solution space.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0An IPv6 mobility solution is needed for the guarantee of<br>
=C2=A0 =C2=A0communication continuity in vehicular networks so that a vehic=
le&#39;s<br>
=C2=A0 =C2=A0TCP session can be continued, or UDP packets can be delivered =
to a<br>
=C2=A0 =C2=A0vehicle as a destination without loss while it moves from an I=
P-RSU&#39;s<br>
=C2=A0 =C2=A0wireless coverage to another IP-RSU&#39;s wireless coverage.=
=C2=A0 In<br>
=C2=A0 =C2=A0Figure 1, assuming that Vehicle2 has a TCP session (or a UDP s=
ession)<br>
=C2=A0 =C2=A0with a corresponding node in the vehicular cloud, Vehicle2 can=
 move<br>
=C2=A0 =C2=A0from IP-RSU1&#39;s wireless coverage to IP-RSU2&#39;s wireless=
 coverage.=C2=A0 In<br>
=C2=A0 =C2=A0this case, a handover for Vehicle2 needs to be performed by ei=
ther a<br>
=C2=A0 =C2=A0host-based mobility management scheme (e.g., MIPv6 [RFC6275]) =
or a<br>
=C2=A0 =C2=A0network-based mobility management scheme (e.g., PMIPv6 [RFC521=
3] and<br>
=C2=A0 =C2=A0AERO [RFC6706BIS]).<br>
<br>
=C2=A0 =C2=A0In the host-based mobility scheme (e.g., MIPv6), an IP-RSU pla=
ys a<br>
=C2=A0 =C2=A0role of a home agent.=C2=A0 On the other hand, in the network-=
based<br>
=C2=A0 =C2=A0mobility scheme (e.g., PMIPv6, an MA plays a role of a mobilit=
y<br>
=C2=A0 =C2=A0management controller such as a Local Mobility Anchor (LMA) in=
<br>
=C2=A0 =C2=A0PMIPv6, which also serves vehicles as a home agent, and an IP-=
RSU<br>
=C2=A0 =C2=A0plays a role of an access router such as a Mobile Access Gatew=
ay<br>
=C2=A0 =C2=A0(MAG) in PMIPv6 [RFC5213].=C2=A0 The host-based mobility schem=
e needs<br>
=C2=A0 =C2=A0client functionality in IPv6 stack of a vehicle as a mobile no=
de for<br>
=C2=A0 =C2=A0mobility signaling message exchange between the vehicle and ho=
me<br>
=C2=A0 =C2=A0agent.=C2=A0 On the other hand, the network-based mobility sch=
eme does not<br>
=C2=A0 =C2=A0need such a client functionality for a vehicle because the net=
work<br>
=C2=A0 =C2=A0infrastructure node (e.g., MAG in PMIPv6) as a proxy mobility =
agent<br>
=C2=A0 =C2=A0handles the mobility signaling message exchange with the home =
agent<br>
=C2=A0 =C2=A0(e.g., LMA in PMIPv6) for the sake of the vehicle.<br>
<br>
=C2=A0 =C2=A0There are a scalability issue and a route optimization issue i=
n the<br>
=C2=A0 =C2=A0network-based mobility scheme (e.g., PMIPv6) when an MA covers=
 a<br>
=C2=A0 =C2=A0large vehicular network governing many IP-RSUs.=C2=A0 In this =
case, a<br>
=C2=A0 =C2=A0distributed mobility scheme (e.g., DMM [RFC7429]) can mitigate=
 the<br>
=C2=A0 =C2=A0scalability issue by distributing multiple MAs in the vehicula=
r<br>
=C2=A0 =C2=A0network such that they are positioned closer to vehicles for r=
oute<br>
=C2=A0 =C2=A0optimization and bottleneck mitigation in a central MA in the<=
br>
=C2=A0 =C2=A0network-based mobility scheme.=C2=A0 All these mobility approa=
ches (i.e.,<br>
=C2=A0 =C2=A0a host-based mobility scheme, network-based mobility scheme, a=
nd<br>
=C2=A0 =C2=A0distributed mobility scheme) and a hybrid approach of a combin=
ation<br>
=C2=A0 =C2=A0of them need to provide an efficient mobility service to vehic=
les<br>
=C2=A0 =C2=A0moving fast and moving along with the relatively predictable<b=
r>
=C2=A0 =C2=A0trajectories along the roadways.<br>
<br>
=C2=A0 =C2=A0In vehicular networks, the control plane can be separated from=
 the<br>
=C2=A0 =C2=A0data plane for efficient mobility management and data forwardi=
ng by<br>
=C2=A0 =C2=A0using the concept of Software-Defined Networking (SDN)<br>
=C2=A0 =C2=A0[RFC7149][DMM-FPC].=C2=A0 Note that Forwarding Policy Configur=
ation (FPC)<br>
=C2=A0 =C2=A0in [DMM-FPC], which is a flexible mobility management system, =
can<br>
=C2=A0 =C2=A0manage the separation of data-plane and control-plane in DMM.=
=C2=A0 In<br>
=C2=A0 =C2=A0SDN, the control plane and data plane are separated for the ef=
ficient<br>
=C2=A0 =C2=A0management of forwarding elements (e.g., switches and routers)=
 where<br>
=C2=A0 =C2=A0an SDN controller configures the forwarding elements in a cent=
ralized<br>
=C2=A0 =C2=A0way and they perform packet forwarding according to their forw=
arding<br>
=C2=A0 =C2=A0tables that are configured by the SDN controller.=C2=A0 An MA =
as an SDN<br>
=C2=A0 =C2=A0controller needs to efficiently configure and monitor its IP-R=
SUs and<br>
=C2=A0 =C2=A0vehicles for mobility management, location management, and sec=
urity<br>
=C2=A0 =C2=A0services.<br>
<br>
=C2=A0 =C2=A0The mobility information of a GPS receiver mounted in its vehi=
cle<br>
=C2=A0 =C2=A0(e.g., position, speed, and direction) can be used to accommod=
ate<br>
=C2=A0 =C2=A0mobility-aware proactive handover schemes, which can perform t=
he<br>
=C2=A0 =C2=A0handover of a vehicle according to its mobility and the wirele=
ss<br>
=C2=A0 =C2=A0signal strength of a vehicle and an IP-RSU in a proactive way.=
<br>
<br>
=C2=A0 =C2=A0Vehicles can use the TCC as their Home Network having a home a=
gent<br>
=C2=A0 =C2=A0for mobility management as in MIPv6 [RFC6275] and PMIPv6 [RFC5=
213],<br>
=C2=A0 =C2=A0so the TCC (or an MA inside the TCC) maintains the mobility<br=
>
=C2=A0 =C2=A0information of vehicles for location management.=C2=A0 IP tunn=
eling over<br>
=C2=A0 =C2=A0the wireless link should be avoided for performance efficiency=
.<br>
=C2=A0 =C2=A0Also, in vehicular networks, asymmetric links sometimes exist =
and<br>
=C2=A0 =C2=A0must be considered for wireless communications such as V2V and=
 V2I.<br>
<br>
&gt;&gt;&gt;=C2=A0 This is all very informative text but does not state a p=
roblem. Is there a<br>
problem is left to be solved or are we assessing the applicability of<br>
protocols? Could it for instance, forward point to issues discussed in sect=
ion<br>
5?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, as internal networks, a vehicle&#39;s mo=
ving<br>
=C2=A0 =C2=A0network and an EN&#39;s fixed network are self-contained netwo=
rks having<br>
=C2=A0 =C2=A0multiple subnets and having an edge router (e.g., IP-OBU and I=
P-RSU)<br>
=C2=A0 =C2=A0for the communication with another vehicle or another EN.=C2=
=A0 The<br>
=C2=A0 =C2=A0internetworking between two internal networks via V2I communic=
ation<br>
=C2=A0 =C2=A0requires the exchange of the network parameters and the networ=
k<br>
=C2=A0 =C2=A0prefixes of the internal networks.=C2=A0 For the efficiency, t=
he network<br>
=C2=A0 =C2=A0prefixes of the internal networks (as a moving network) in a v=
ehicle<br>
=C2=A0 =C2=A0need to be delegated and configured automatically.=C2=A0 Note =
that a<br>
=C2=A0 =C2=A0moving network&#39;s network prefix can be called a Mobile Net=
work Prefix<br>
=C2=A0 =C2=A0(MNP) [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. MNP is originally =
defined here<br>
<a href=3D"https://datatracker.ietf.org/doc/html/rfc3963#section-2" target=
=3D"_blank">https://datatracker.ietf.org/doc/html/rfc3963#section-2</a> and=
 that=E2=80=99s a reference<br>
you can use normatively.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0As shown in Figure 3, the addresses used for IPv6 transmission=
s over<br>
=C2=A0 =C2=A0the wireless link interfaces for IP-OBU and IP-RSU can be eith=
er<br>
=C2=A0 =C2=A0global IPv6 addresses, or IPv6 ULAs as long as IPv6 packets ca=
n be<br>
=C2=A0 =C2=A0routed within vehicular networks [OMNI].<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. There needs to=C2=
=A0 be a routing protocol<br>
like a MANET that will accept to carry the<br>
=C2=A0MNPs, and that must be implemented by the infra and both cars. The OM=
NI spec<br>
=C2=A0is clear on that. This is why at first glance I see OMNI as a full mo=
bile<br>
=C2=A0router in a bump in the stack. Now what is the problem behind this? N=
o such<br>
=C2=A0protocol at IETF? Too many to choose from? No deployment?<br>
&lt;snip&gt;<br>
<br>
When global IPv6 addresses<br>
=C2=A0 =C2=A0are used, wireless interface configuration and control overhea=
d for<br>
=C2=A0 =C2=A0Duplicate Address Detection (DAD) [RFC4862] and Multicast List=
ener<br>
=C2=A0 =C2=A0Discovery (MLD) [RFC2710][RFC3810] should be minimized to supp=
ort V2I<br>
=C2=A0 =C2=A0and V2X communications for vehicles moving fast along roadways=
; when<br>
=C2=A0 =C2=A0ULAs and the OMNI interface are used, no DAD nor MLD messaging=
 is<br>
=C2=A0 =C2=A0needed.<br>
<br>
&gt;&gt;&gt; Then again you=E2=80=99re overselling OMNI. Isn=E2=80=99t it t=
he no dad needed a property<br>
of injecting a BYOA in the fabric for an GUA MIP Home Address which is know=
n to<br>
be unique at home? &gt;&gt;&gt; OTOH, autoconf=E2=80=99ing a random ULA =E2=
=80=9CFD=E2=80=A6=E2=80=9Dprefix has lesser<br>
DAD properties than autoconf=E2=80=99ing a random 64bit IID in a classical =
subnet. So<br>
who says DAD isn=E2=80=99t required for OMNI ULA? &gt;&gt;&gt; note that IM=
HO DAD on wireless is<br>
a lot more harm than good, and I agree that with a good pseudo random gener=
ator<br>
the ULA has no chance to collision in the real world, as OMNI claims. It=E2=
=80=99s just<br>
that your argument here plays the other way, because there are less random =
bits<br>
(56)=C2=A0 in the ULA prefix than in the IID (62), and if one starts using =
more<br>
prefix bits to be non-random, there will be a time when DAD on prefix is ne=
eded.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Let us consider the upload/download time of a vehicle when it =
passes<br>
=C2=A0 =C2=A0through the wireless communication coverage of an IP-RSU.=C2=
=A0 For a<br>
=C2=A0 =C2=A0given typical setting where 1km is the maximum DSRC communicat=
ion<br>
=C2=A0 =C2=A0range [DSRC] and 100km/h is the speed limit in highway, the dw=
elling<br>
=C2=A0 =C2=A0time can be calculated to be 72 seconds by dividing the diamet=
er of<br>
=C2=A0 =C2=A0the 2km (i.e., two times of DSRC communication range where an =
IP-RSU<br>
=C2=A0 =C2=A0is located in the center of the circle of wireless communicati=
on) by<br>
=C2=A0 =C2=A0the speed limit of 100km/h (i.e., about 28m/s).=C2=A0 For the =
72 seconds,<br>
=C2=A0 =C2=A0a vehicle passing through the coverage of an IP-RSU can upload=
 and<br>
=C2=A0 =C2=A0download data packets to/from the IP-RSU.<br>
<br>
&lt;snip&gt;<br>
<br>
4.3.=C2=A0 V2V-based Internetworking<br>
<br>
&gt;&gt;&gt; In this section it looks like the cars are in a stable line of=
 sight<br>
relationship. Which is probably fine for a platoon, but when you drive alon=
g<br>
with friends in different cars, you realize that the line of sight assumpti=
on<br>
does not stand over time. Soon enough, other cars meddle in, and possibly o=
ne<br>
of the cars drives faster and too far ahead so you need the infra to relay,=
<br>
possibly over multiple infra hops.<br>
<br>
&gt;&gt;&gt; so in this section, I=E2=80=99d expect to see a Vehicle commun=
icating with another<br>
one and using either line of sight or V2V relaying but also using relay via=
 V2I<br>
(multihop I2I not just hub and spoke V2I2V ), alternatively to together for=
<br>
redundancy. Is that part of the problem?<br>
<br>
&gt;&gt;&gt; reading deeper section 5 I found excellent text on routing via=
 V and via I.<br>
This tells that section 4 does not play a good role at justifying section 5=
.<br>
Maybe keep section 4 for another doc?<br>
<br>
&gt;&gt;&gt; What kind or reliability is required in a V2V use case? Do you=
 think ND can<br>
handle it? Or MANET? What would be the assumption on L2 (roaming time, unic=
ast<br>
vs P2MP) and on L3 (reliability ala DetNet/RAW). Should we have some L3 <br=
>
redundancy?<br>
<br>
&lt;snip&gt;<br>
<br>
5.=C2=A0 Problem Statement<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0In order to specify protocols using the architecture mentioned=
 in<br>
=C2=A0 =C2=A0Section 4.1, IPv6 core protocols have to be adapted to overcom=
e<br>
=C2=A0 =C2=A0certain challenging aspects of vehicular networking.=C2=A0 Sin=
ce the<br>
=C2=A0 =C2=A0vehicles are likely to be moving at great speed, protocol exch=
anges<br>
=C2=A0 =C2=A0need to be completed in a time relatively short compared to th=
e<br>
=C2=A0 =C2=A0lifetime of a link between a vehicle and an IP-RSU, or between=
 two<br>
=C2=A0 =C2=A0vehicles.<br>
<br>
&gt;&gt;&gt; Any order of magnitude?<br>
&gt;&gt;&gt; Can you indicate whether this already rules out certain proced=
ures, e.g.<br>
DAD ?<br>
<br>
=C2=A0 =C2=A0The lifetime of a session varies depending on the session&#39;=
s type such<br>
=C2=A0 =C2=A0as a web surfing, voice call over IP, and DNS query.=C2=A0 Reg=
ardless of a<br>
=C2=A0 =C2=A0session&#39;s type, to guide all the IPv6 packets to their des=
tination<br>
=C2=A0 =C2=A0host, IP mobility should be supported for the session.<br>
<br>
&gt;&gt;&gt; this seems to be for unicast when you know who to talk to. Is =
there a need<br>
some multicast groups like anybody around interested in topic blah like I c=
ould<br>
be multicasting the speed of vehicles coming the other way that I crossed<b=
r>
recently, for use of vehicles that I=E2=80=99m crossing now, so they can se=
e a slowdown<br>
on advance<br>
<br>
=C2=A0 =C2=A0Thus, the time constraint of a wireless link has a major impac=
t on<br>
=C2=A0 =C2=A0IPv6 Neighbor Discovery (ND).=C2=A0 Mobility Management (MM) i=
s also<br>
=C2=A0 =C2=A0vulnerable to disconnections that occur before the completion =
of<br>
=C2=A0 =C2=A0identity verification and tunnel management.=C2=A0 This is esp=
ecially true<br>
=C2=A0 =C2=A0given the unreliable nature of wireless communication.=C2=A0 T=
his section<br>
=C2=A0 =C2=A0presents key topics such as neighbor discovery and mobility<br=
>
=C2=A0 =C2=A0management.<br>
<br>
&gt;&gt;&gt; Only ND? What about the MANET?<br>
&gt;&gt;&gt; how fast should ND be to be suitable?<br>
&gt;&gt;&gt; is there also a bandwidth check? You can make things much fast=
er if you<br>
dedicate a lot of spectrum to it. But that can also be a waste.<br>
<br>
5.1.=C2=A0 Neighbor Discovery<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0The requirements for IPv6 ND for vehicular networks are effici=
ent DAD<br>
=C2=A0 =C2=A0and NUD operations.<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 This merging and partitioning should be considered for=
 the<br>
=C2=A0 =C2=A0IPv6 ND such as IPv6 Stateless Address Autoconfiguration (SLAA=
C)<br>
=C2=A0 =C2=A0[RFC4862].<br>
<br>
&gt;&gt;&gt; Not lookup? Is it the intention to use IP unicast over MAC bro=
adcast, which<br>
is a good idea in my book?<br>
<br>
=C2=A0&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Also, the partitioning of a VANET may make vehicles with the s=
ame<br>
=C2=A0 =C2=A0prefix be physically unreachable.=C2=A0 Also, SLAAC needs to p=
revent IPv6<br>
=C2=A0 =C2=A0address duplication due to the merging of VANETs.=C2=A0 Accord=
ing to the<br>
=C2=A0 =C2=A0merging and partitioning, a destination vehicle (as an IPv6 ho=
st)<br>
=C2=A0 =C2=A0needs to be distinguished as either an on-link host or an off-=
link<br>
=C2=A0 =C2=A0host even though the source vehicle uses the same prefix as th=
e<br>
=C2=A0 =C2=A0destination vehicle.<br>
<br>
&gt;&gt;&gt; should reference to draft-nordmark-intarea-ippl<br>
<br>
=C2=A0 =C2=A0To efficiently prevent IPv6 address duplication due to the VAN=
ET<br>
=C2=A0 =C2=A0partitioning and merging from happening in vehicular networks,=
 the<br>
=C2=A0 =C2=A0vehicular networks need to support a vehicular-network-wide DA=
D by<br>
=C2=A0 =C2=A0defining a scope that is compatible with the legacy DAD.=C2=A0=
 In this<br>
=C2=A0 =C2=A0case, two vehicles can communicate with each other when there =
exists<br>
=C2=A0 =C2=A0a communication path over VANET or a combination of VANETs and=
 IP-<br>
=C2=A0 =C2=A0RSUs, as shown in Figure 1.=C2=A0 By using the vehicular-netwo=
rk-wide DAD,<br>
=C2=A0 =C2=A0vehicles can assure that their IPv6 addresses are unique in th=
e<br>
=C2=A0 =C2=A0vehicular network whenever they are connected to the vehicular=
<br>
=C2=A0 =C2=A0infrastructure or become disconnected from it in the form of V=
ANET.<br>
<br>
&gt;&gt;&gt; Excellent<br>
<br>
=C2=A0 =C2=A0ND time-related parameters such as router lifetime and Neighbo=
r<br>
=C2=A0 =C2=A0Advertisement (NA) interval need to be adjusted for vehicle sp=
eed and<br>
=C2=A0 =C2=A0vehicle density.=C2=A0 For example, the NA interval needs to b=
e<br>
=C2=A0 =C2=A0dynamically adjusted according to a vehicle&#39;s speed so tha=
t the<br>
=C2=A0 =C2=A0vehicle can maintain its neighboring vehicles in a stable way,=
<br>
=C2=A0 =C2=A0considering the collision probability with the NA messages sen=
t by<br>
=C2=A0 =C2=A0other vehicles.<br>
<br>
&gt;&gt;&gt; Is that a problem or just an operational setting that needs to=
 be found?<br>
&gt;&gt;&gt; Do we need to reconsider the concepts of those timers?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, IPv6 ND should have =
minimum<br>
=C2=A0 =C2=A0changes for the interoperability with the legacy IPv6 ND used =
in the<br>
=C2=A0 =C2=A0Internet, including the DAD and NUD operations.<br>
<br>
&gt;&gt;&gt; I do not find the logical link with the text before, why is th=
is a =E2=80=9Cthus=E2=80=9D?<br>
&gt;&gt;&gt; why should the ND inside the VANET be constrained to be intero=
perable? This<br>
may place constraints on the solution.<br>
<br>
5.1.1.=C2=A0 Link Model<br>
<br>
=C2=A0 =C2=A0A prefix model for a vehicular network needs to facilitate the=
<br>
<br>
&gt;&gt;&gt; Do you mean a =E2=80=9Csubnet model=E2=80=9D as opposed to =E2=
=80=9Cprefix model=E2=80=9D.<br>
&gt;&gt;&gt; it would make this piece and the next should refer to<br>
draft-thubert-6man-ipv6-over-wireless for IPv6 over P2MP /NBMA, for both li=
nk<br>
and subnet issues. The general ideas are the same, but the gory details her=
e<br>
are slightly incorrect, like this notion of prefix model than comes out of =
the<br>
blue. The model is really the subnet model for the subnet associated to P2M=
P.<br>
<br>
=C2=A0 =C2=A0communication between two vehicles with the same prefix regard=
less of<br>
=C2=A0 =C2=A0the vehicular network topology as long as there exist bidirect=
ional<br>
=C2=A0 =C2=A0E2E paths between them in the vehicular network including VANE=
Ts and<br>
=C2=A0 =C2=A0IP-RSUs.=C2=A0 This prefix model allows vehicles with the same=
 prefix to<br>
=C2=A0 =C2=A0communicate with each other via a combination of multihop V2V =
and<br>
=C2=A0 =C2=A0multihop V2I with VANETs and IP-RSUs.=C2=A0 Note that the OMNI=
 interface<br>
=C2=A0 =C2=A0supports an NBMA link model where multihop V2V and V2I communi=
cations<br>
=C2=A0 =C2=A0use each mobile node&#39;s ULAs without need for any DAD or ML=
D<br>
=C2=A0 =C2=A0messaging.<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; I kinda agree about the OMNI interface model, nothing against =
that. But you<br>
must see that there needs a lot more than what the OMNI interface to get<br=
>
packets across V and I hops to the destination. Like routing ala MANET,<br>
redundancy handling ala DetNet because it will be very lossy, path manageme=
nt<br>
ala RAW to optimize delivery vs. spectrum=E2=80=A6 And OMNI ignores ND so i=
t does not<br>
solve the ND problems above.<br>
<br>
=C2=A0 =C2=A0IPv6 protocols work under certain assumptions that do not nece=
ssarily<br>
=C2=A0 =C2=A0hold for vehicular wireless access link types other than OMNI/=
NBMA<br>
=C2=A0 =C2=A0[VIP-WAVE][RFC5889]; the rest of this section discusses implic=
ations<br>
=C2=A0 =C2=A0for those link types that do not apply when the OMNI/NBMA link=
 model<br>
<br>
&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt; The keyword here is P2MP / NBMA, and OMNI is one interface tha=
t accepts<br>
that. There are others. IBM=E2=80=99s IPv4 over Frame relay was already P2M=
P / NBMA,<br>
using routing to complete the partial mesh in P2MP. The text seems to imply=
<br>
that OMNI is the only way to do that and that=E2=80=99s wrong. Also OMNI is=
 loaded with<br>
other stuff than a plain P2MP capable interface. And ND over P2MP is not do=
ne<br>
by OMNI, OMNI only makes classical ND worse and only works in a full mesh. =
OTOH<br>
RFC 8505, which is designed to do ND for P2MP /NBMA would indeed work very =
well<br>
within an OMNI interface and solve those problems. &gt;&gt;&gt; My point is=
 that you<br>
need to tell the full story or refrain from entering solution space in this=
 doc<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0There is a relationship between a link and a prefix, besides t=
he<br>
=C2=A0 =C2=A0different scopes that are expected from the link-local and glo=
bal<br>
=C2=A0 =C2=A0types of IPv6 addresses.=C2=A0 In an IPv6 link, it is assumed =
that all<br>
=C2=A0 =C2=A0interfaces which are configured with the same subnet prefix an=
d with<br>
=C2=A0 =C2=A0on-link bit set can communicate with each other on an IPv6 lin=
k.<br>
<br>
&gt;&gt;&gt; not assumed; that=E2=80=99s what the onlink but set tells. The=
 conclusion should be<br>
that the VANET cannot set the O bit.<br>
<br>
=C2=A0 =C2=A0However, the vehicular link model needs to define the relation=
ship<br>
=C2=A0 =C2=A0between a link and a prefix, considering the dynamics of wirel=
ess<br>
=C2=A0 =C2=A0links and the characteristics of VANET.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0From the previous observation, a vehicular link model should c=
onsider<br>
=C2=A0 =C2=A0the frequent partitioning and merging of VANETs due to vehicle=
<br>
=C2=A0 =C2=A0mobility.=C2=A0 Therefore, the vehicular link model needs to u=
se an on-<br>
=C2=A0 =C2=A0link prefix and off-link prefix according to the network topol=
ogy of<br>
=C2=A0 =C2=A0vehicles such as a one-hop reachable network and a multihop re=
achable<br>
<br>
&gt;&gt;&gt; No, the once a node saw a O bit set that sticks even if it see=
s other<br>
advertisements of the PIO with the O bit not set. &gt;&gt;&gt; This is a gl=
obal and<br>
intrinsic property of the prefix (and an attack vector that could be mentio=
ned<br>
in the sec section). &gt;&gt;&gt; the VANET prefix must never come with the=
 O bit set.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0network (or partitioned networks).=C2=A0 If the vehicles with =
the same<br>
=C2=A0 =C2=A0prefix are reachable from each other in one hop, the prefix sh=
ould be<br>
=C2=A0 =C2=A0on-link.<br>
<br>
&gt;&gt;&gt;&gt; No, see above; but the router may redirect though it is re=
ally risky<br>
unless this is a stable situation like a parking place.<br>
<br>
=C2=A0 =C2=A0Thus, in IPv6-based vehicular networking, the vehicular link m=
odel<br>
=C2=A0 =C2=A0should have minimum changes for interoperability with standard=
 IPv6<br>
=C2=A0 =C2=A0links in an efficient fashion to support IPv6 DAD, MLD and NUD=
<br>
=C2=A0 =C2=A0operations.=C2=A0 When the OMNI NBMA link model is used, there=
 are no link<br>
=C2=A0 =C2=A0model changes nor DAD/MLD messaging required.<br>
<br>
&gt;&gt;&gt;&gt; again overselling OMNI.<br>
&gt;&gt;&gt;&gt; You need a good P2MP subnet model with routing support whe=
n the mesh is<br>
partial. My company alone has been shipping million of nodes that build sub=
nets<br>
of thousands, and that was done using IETF standards.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For vehicular networks with high mobility and density, the DAD=
 needs<br>
=C2=A0 =C2=A0to be performed efficiently with minimum overhead so that the<=
br>
=C2=A0 =C2=A0vehicles can exchange a driving safety message (e.g., collisio=
n<br>
=C2=A0 =C2=A0avoidance and accident notification) with each other with a sh=
ort<br>
=C2=A0 =C2=A0interval (e.g., 0.5 second) by a technical report from NHTSA<b=
r>
=C2=A0 =C2=A0(National Highway Traffic Safety Administration) [NHTSA-ACAS-R=
eport].<br>
=C2=A0 =C2=A0Such a driving safety message may include a vehicle&#39;s mobi=
lity<br>
=C2=A0 =C2=A0information (i.e., position, speed, direction, and acceleratio=
n/<br>
=C2=A0 =C2=A0deceleration).=C2=A0 The exchange interval of this message is =
0.5 second,<br>
=C2=A0 =C2=A0which is required to allow a driver to avoid a rear-end crash =
from<br>
=C2=A0 =C2=A0another vehicle.<br>
<br>
&gt;&gt;&gt; IPv6 over broadcast MAC (used to be called internet 0, 10+ yea=
rs ago)<br>
solves that MAC issue since there is no MAC.<br>
<br>
5.1.3.=C2=A0 Routing<br>
<br>
=C2=A0 =C2=A0For multihop V2V communications in either a VANET or VANETs vi=
a IP-<br>
=C2=A0 =C2=A0RSUs, a vehicular Mobile Ad Hoc Networks (MANET) routing proto=
col may<br>
=C2=A0 =C2=A0be required to support both unicast and multicast in the links=
 of the<br>
=C2=A0 =C2=A0subnet with the same IPv6 prefix.=C2=A0 However, it will be co=
stly to run<br>
=C2=A0 =C2=A0both vehicular ND and a vehicular ad hoc routing protocol in t=
erms of<br>
=C2=A0 =C2=A0control traffic overhead [ID-Multicast-Problems].<br>
<br>
&gt;&gt;&gt; we do that with IETF standards on battery operated devices alr=
eady. Using<br>
RFC 8505 for the UNI and RPL for the NNI. It is scalable (we=E2=80=99ve see=
n 30 hops in<br>
meshes of thousands in the real world though it=E2=80=99s not the normal op=
erational<br>
model, but can happen to maintain connectivity during the reboot of a root)=
 and<br>
does not use broadcast. RPL was initially designed as a V2V2V protocol but<=
br>
found its market on the IoT. I=E2=80=99m sure the protocol would gladly com=
e back to<br>
its roots.<br>
<br>
=C2=A0 =C2=A0A routing protocol for a VANET may cause redundant wireless fr=
ames in<br>
=C2=A0 =C2=A0the air to check the neighborhood of each vehicle and compute =
the<br>
=C2=A0 =C2=A0routing information in a VANET with a dynamic network topology=
<br>
=C2=A0 =C2=A0because the IPv6 ND is used to check the neighborhood of each<=
br>
=C2=A0 =C2=A0vehicle.=C2=A0 Thus, the vehicular routing needs to take advan=
tage of the<br>
=C2=A0 =C2=A0IPv6 ND to minimize its control overhead.<br>
<br>
&gt;&gt;&gt; A clean description of the interaction of RPL and RFC 8505 in =
our IoT<br>
networks. Note that the speed of the PHY in VANET balanced the instability =
of<br>
the topology, and RPL still applies. Note also that RPL uses DV with a rout=
ing<br>
stretch in order to minimize the topology awareness that=E2=80=99s needed i=
n each node,<br>
which results in minimal signaling.<br>
<br>
5.2.=C2=A0 Mobility Management<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For a mobility management scheme in a shared link, where the w=
ireless<br>
=C2=A0 =C2=A0subnets of multiple IP-RSUs share the same prefix, an efficien=
t<br>
=C2=A0 =C2=A0vehicular-network-wide DAD is required.=C2=A0 If DHCPv6 is use=
d to assign<br>
=C2=A0 =C2=A0a unique IPv6 address to each vehicle in this shared link,<br>
<br>
&gt;&gt;&gt; I would not use the term link, or shared. Maybe shared link -&=
gt; domain?<br>
&lt;snip&gt;<br>
<br>
the DAD is<br>
=C2=A0 =C2=A0not required.=C2=A0 On the other hand, for a mobility manageme=
nt scheme<br>
=C2=A0 =C2=A0with a unique prefix per mobile node (e.g., PMIPv6 [RFC5213] a=
nd OMNI<br>
=C2=A0 =C2=A0[OMNI]), DAD is not required because the IPv6 address of a veh=
icle&#39;s<br>
=C2=A0 =C2=A0external wireless interface is guaranteed to be unique.<br>
<br>
&gt;&gt;&gt; again overselling OMNI<br>
&gt;&gt;&gt; As I said earlier, this is wring there are (64*) more chances =
of a<br>
collision in OMNI prefixes than in IPv6 IIDs. &gt;&gt;&gt; OMNI prefixes ca=
n collision,<br>
home addresses that are unique on a home network cannot. &gt;&gt;&gt; Now i=
f both the<br>
OMNI prefix and the IID are good randoms, then obviously, the chances of<br=
>
collisions round up to 0. &gt;&gt;&gt; Collision is certainly not my worst =
fear.<br>
<br>
=C2=A0 There is a<br>
=C2=A0 =C2=A0tradeoff between the prefix usage efficiency and DAD overhead.=
=C2=A0 Thus,<br>
=C2=A0 =C2=A0the IPv6 address autoconfiguration for vehicular networks need=
s to<br>
=C2=A0 =C2=A0consider this tradeoff to support efficient mobility managemen=
t.<br>
<br>
&gt;&gt;&gt; This is way too superficial and hides the reality of things.<b=
r>
- Using a VANET Infra prefix allows direct routability to the internet whic=
h<br>
BYOA does not since the BYOA is not topologically correct. Yes, it costs a =
DAD<br>
with classic ND, but it does not with RCF8505 and the draft fails to mentio=
n<br>
that. - A BYOA needs a tunnel home, and the node needs to know who is reach=
able<br>
inside the VANET and what is not to decide to tunnel or not; this is a<br>
difficult problem (vs. control place overhead) that is not discussed here.<=
br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the case of a multihomed network, a vehicle can follow the=
 first-<br>
=C2=A0 =C2=A0hop router selection rule described in [RFC8028].=C2=A0 That i=
s, the<br>
=C2=A0 =C2=A0vehicle should select its default router for each prefix by<br=
>
=C2=A0 =C2=A0preferring the router that advertised the prefix.<br>
<br>
&gt;&gt;&gt; Still router discovery (in and out) must be very fast. Thing o=
f the RA<br>
intervale in MIPv6. Is that sufficient? Too expensive?<br>
<br>
&lt;snip&gt;<br>
<br>
6.=C2=A0 Security Considerations<br>
&gt;&gt;&gt; Any discussion on the security of classical ND and other opera=
tional issues<br>
(rfc6583) ?<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0Security and privacy are paramount in V2I, V2V, and V2X networ=
king.<br>
=C2=A0 =C2=A0Vehicles and infrastructure must be authenticated in order to<=
br>
=C2=A0 =C2=A0participate in vehicular networking.=C2=A0 Also, in-vehicle de=
vices (e.g.,<br>
=C2=A0 =C2=A0ECU) and a driver/passenger&#39;s mobile devices (e.g., smartp=
hone and<br>
=C2=A0 =C2=A0tablet PC) in a vehicle need to communicate with other in-vehi=
cle<br>
=C2=A0 =C2=A0devices and another driver/passenger&#39;s mobile devices in a=
nother<br>
=C2=A0 =C2=A0vehicle, or other servers behind an IP-RSU in a secure way.=C2=
=A0 Even<br>
=C2=A0 =C2=A0though a vehicle is perfectly authenticated and legitimate, it=
 may be<br>
=C2=A0 =C2=A0hacked for running malicious applications to track and collect=
 its<br>
=C2=A0 =C2=A0and other vehicles&#39; information.=C2=A0 In this case, an at=
tack mitigation<br>
=C2=A0 =C2=A0process may be required to reduce the aftermath of malicious<b=
r>
=C2=A0 =C2=A0behaviors.<br>
<br>
&gt;&gt;&gt; The section should mention that both with classical ND and BYO=
A, addresses<br>
can be impersonated, and RFC 8928 protects against that in both cases while=
<br>
maintaining privacy.<br>
<br>
=C2=A0 =C2=A0Even though vehicles can be authenticated with valid certifica=
tes by<br>
=C2=A0 =C2=A0an authentication server in the vehicular cloud, the authentic=
ated<br>
<br>
&gt;&gt;&gt; Is PKI feasible (deploying it in every car?). Is it fast enoug=
h? Is it<br>
really what IPWAVE thinks vehicle should use????? &gt;&gt;&gt; e.g. why wou=
ld one need<br>
to authenticate to a V2I network? &gt;&gt;&gt; from the text earlier in the=
 doc, it<br>
seemed that what you really want is access that is fast to join, capable of=
<br>
offering the reachability you want, anonymous, and innocuous (cars can not =
harm<br>
one another).<br>
<br>
=C2=A0 =C2=A0vehicles may harm other vehicles, so their communication activ=
ities<br>
=C2=A0 =C2=A0need to be logged in either a central way through a logging se=
rver<br>
=C2=A0 =C2=A0(e.g., TCC) in the vehicular cloud or a distributed way (e.g.,=
<br>
=C2=A0 =C2=A0blockchain [Bitcoin]) along with other vehicles or infrastruct=
ure.<br>
=C2=A0 =C2=A0For the non-repudiation of the harmful activities of malicious=
 nodes,<br>
=C2=A0 =C2=A0a blockchain technology can be used [Bitcoin].=C2=A0 Each mess=
age from a<br>
=C2=A0 =C2=A0vehicle can be treated as a transaction and the neighboring ve=
hicles<br>
=C2=A0 =C2=A0can play the role of peers in a consensus method of a blockcha=
in<br>
=C2=A0 =C2=A0[Bitcoin][Vehicular-BlockChain].=C2=A0 For a blockchain&#39;s =
efficient<br>
=C2=A0 =C2=A0consensus in vehicular networks having fast moving vehicles, a=
 new<br>
=C2=A0 =C2=A0consensus algorithm needs to be developed or an existing conse=
nsus<br>
=C2=A0 =C2=A0algorithm needs to be enhanced.<br>
<br>
&gt;&gt;&gt; solution space; better express the=C2=A0 security needs since =
this is a PS.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0To identify malicious vehicles among vehicles, an authenticati=
on<br>
=C2=A0 =C2=A0method is required.<br>
<br>
&gt;&gt;&gt; No. As said earlier a vehicle can be infected. You need innocu=
ousness.which<br>
can come from things like isolation, zerotrust, and protocols that are<br>
difficult to hack around. Classical IPv6 ND is open bar. RFC 8505/8928 is<b=
r>
protected by construction, anonymous, and fast.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0 =C2=A0For the setup of a secure channel over IPsec or TLS, the multi=
hop V2I<br>
=C2=A0 =C2=A0communications over DSRC is required in a highway for the<br>
=C2=A0 =C2=A0authentication by involving multiple intermediate vehicles as =
relay<br>
=C2=A0 =C2=A0nodes toward an IP-RSU connected to an authentication server i=
n the<br>
=C2=A0 =C2=A0vehicular cloud.=C2=A0 The V2I communications over 5G V2X (or =
LTE V2X) is<br>
=C2=A0 =C2=A0required to allow a vehicle to communicate directly with a gNo=
deB (or<br>
=C2=A0 =C2=A0eNodeB) connected to an authentication server in the vehicular=
 cloud.<br>
<br>
&gt;&gt;&gt; solution space. Instead, you could mention that setting up sec=
ured channels<br>
between cars that cross one another might not complete in time to establish=
 the<br>
communication channel, and that the innocuousness must come from zerotrust =
in<br>
the transactions between the cars.<br>
=C2=A0 =C2=A0For the IPv6 ND, the DAD is required to ensure the uniqueness =
of the<br>
=C2=A0 =C2=A0IPv6 address of a vehicle&#39;s wireless interface.<br>
<br>
&gt;&gt;&gt; for classical ND (SLAAC) that=E2=80=99s true. That is not with=
 RFC 8505, since the<br>
infra maintains a table of all addresses in use in the prefix and blocks<br=
>
duplicates without the RFC 4862 DAD method. The stateful autoconf address g=
rant<br>
is immediate.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This DAD can be used<br>
=C2=A0 =C2=A0as a flooding attack that uses the DAD-related ND packets<br>
=C2=A0 =C2=A0disseminated over the VANET or vehicular networks.<br>
<br>
&gt;&gt;&gt; also for DOS attacks. You can block a owner from using an addr=
ess. A<br>
reference to rfc6959 is much needed here.<br>
<br>
&lt;snip&gt;<br>
<br>
=C2=A0This possibility<br>
=C2=A0 =C2=A0indicates that the vehicles and IP-RSUs need to filter out sus=
picious<br>
=C2=A0 =C2=A0ND traffic in advance.=C2=A0 Based on the SEND [RFC3971] mecha=
nism, the<br>
=C2=A0 =C2=A0authentication for routers (i.e., IP-RSUs) can be conducted by=
 only<br>
=C2=A0 =C2=A0selecting an IP-RSU that has a certification path toward trust=
ed<br>
=C2=A0 =C2=A0parties.=C2=A0 For authenticating other vehicles, the cryptogr=
aphically<br>
=C2=A0 =C2=A0generated address (CGA) can be used to verify the true owner o=
f a<br>
=C2=A0 =C2=A0received ND message, which requires to use the CGA ND option i=
n the<br>
=C2=A0 =C2=A0ND protocols.=C2=A0 For a general protection of the ND mechani=
sm, the RSA<br>
=C2=A0 =C2=A0Signature ND option can also be used to protect the integrity =
of the<br>
=C2=A0 =C2=A0messages by public key signatures.=C2=A0 For a more advanced<b=
r>
=C2=A0 =C2=A0authentication mechanism, a distributed blockchain-based mecha=
nism<br>
=C2=A0 =C2=A0[Vehicular-BlockChain] can be used.<br>
<br>
&gt;&gt;&gt; solution space. Again, the draft should focus on problems and =
needs. The<br>
problem here is that SEND is complex, and not implemented in the major stac=
k.<br>
It relies on PKI for trusting the router. The V2I need is a zerotrust model=
<br>
where one V, the other local Vs, and the I, can help each other anonymously=
 and<br>
harmlessly. &lt;snip&gt;<br>
<br>
8.=C2=A0 Informative References<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&gt;&gt;&gt; no normative reference?<br>
<br>
&lt;snip&gt;<br>
<br>
Voila!<br>
<br>
Keep safe;<br>
<br>
Pascal<br>
<br>
<br>
<br>
_______________________________________________<br>
its mailing list<br>
<a href=3D"mailto:its@ietf.org" target=3D"_blank">its@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/its" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/its</a><u></u><u></u></span></font></p>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div>
</div>

</blockquote></div>

--000000000000fdb13405cb1011f7--


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From nobody Wed Sep 22 08:28:10 2021
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From: Bernie Volz via Datatracker <noreply@ietf.org>
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Subject: [Int-dir] Intdir telechat review of draft-ietf-tcpm-rfc793bis-25
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Reviewer: Bernie Volz
Review result: Ready

I am an assigned INT directorate reviewer for draft-ietf-tcpm-rfc793bis (-25).
These comments were written primarily for the benefit of the Internet Area
Directors. Document editors and shepherd(s) should treat these comments just
like they would treat comments from any other IETF contributors and resolve
them along with any other Last Call comments that have been received. For more
details on the INT Directorate, see
https://datatracker.ietf.org/group/intdir/about/.

Based on my review, if I was on the IESG I would ballot this document as YES
(or NO OBJECTION).

This document is useful to simplify the work of TCP software maintainers and
future TCP implementers. Having implemented several TCP stacks (albeit in the
late 1980s and 1990s before many of the documents incorporated and/or
referenced where written), I see that this updated specification would greatly
assist implementers and maintainers.

It has impact to the INT area in that proper and current operation of TCP
stacks is critical to the operation of the Internet.

A few very minor nits (most of these are just things the RFC-Editor will
review): - That the Glossary is near the end, rather than the beginning, is a
bit unusual. And, some terms are defined inline (such as 3WHS, and not included
in the glossary). Likely standardizing this would be a fairly large
undertaking. - There is one use of "three way" instead of "three-way". - There
is one instance of "receivers's" which I think should just be "reliever's". -
"recomendations" is misspelled. - There are mixed uses of "lower level" and
"lower-level". - There is "users authority" which I think should be "user's
authority". - The TCP Header table in the IANA section might use the "footnote"
technique of the table in Appendix B to avoid the page width issues.

Thanks to the TCPM WG and authors for putting this document together.



From nobody Wed Sep 22 13:15:31 2021
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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: Bernie Volz <bevolz@gmail.com>, "int-dir@ietf.org" <int-dir@ietf.org>
CC: "draft-ietf-tcpm-rfc793bis.all@ietf.org" <draft-ietf-tcpm-rfc793bis.all@ietf.org>
Thread-Topic: [Int-dir] Intdir telechat review of draft-ietf-tcpm-rfc793bis-25
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Date: Wed, 22 Sep 2021 20:15:14 +0000
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Subject: Re: [Int-dir] Intdir telechat review of draft-ietf-tcpm-rfc793bis-25
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