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From: <philip.eardley@bt.com>
To: <nagesh.shamnur@huawei.com>, <cpaasch=40apple.com@dmarc.ietf.org>, <olivier.bonaventure@uclouvain.be>
CC: <multipathtcp@ietf.org>, <ashutosh.prakash@huawei.com>
Thread-Topic: [multipathtcp] Regarding rate control at a subflow level
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Date: Mon, 3 Jun 2019 10:15:31 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/multipathtcp/PLeFUMEGQc8D5CPOc0Mu1reKM_8>
Subject: Re: [multipathtcp] Regarding rate control at a subflow level
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From: Nagesh shamnur <nagesh.shamnur@huawei.com>
To: "philip.eardley@bt.com" <philip.eardley@bt.com>, "cpaasch=40apple.com@dmarc.ietf.org" <cpaasch=40apple.com@dmarc.ietf.org>, "olivier.bonaventure@uclouvain.be" <olivier.bonaventure@uclouvain.be>
CC: "multipathtcp@ietf.org" <multipathtcp@ietf.org>, Ashutosh prakash <ashutosh.prakash@huawei.com>
Thread-Topic: [multipathtcp] Regarding rate control at a subflow level
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Date: Mon, 3 Jun 2019 13:07:23 +0000
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Subject: Re: [multipathtcp] Regarding rate control at a subflow level
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Thread-Topic: RE:(2) [multipathtcp] Regarding rate control at a subflow level
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Subject: Re: [multipathtcp] (2)  Regarding rate control at a subflow level
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Archived-At: <https://mailarchive.ietf.org/arch/msg/multipathtcp/2AdhnVRvsSLeL-NGD-MjZOsLhDM>
Subject: Re: [multipathtcp] (4)  Regarding rate control at a subflow level
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From: Gregory Detal <gregory.detal@tessares.net>
Date: Thu, 6 Jun 2019 12:24:06 +0200
Message-ID: <CABFCJ=6B5iK2gMsXrHR8VkemsEBYa=n5Lc4_FJc_0QZHXAGq0w@mail.gmail.com>
To: Philip Eardley <philip.eardley@bt.com>
Cc: cpaasch=40apple.com@dmarc.ietf.org,  Olivier Bonaventure <olivier.bonaventure@uclouvain.be>, multipathtcp <multipathtcp@ietf.org>,  ashutosh.prakash@huawei.com, nagesh.shamnur@huawei.com
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Archived-At: <https://mailarchive.ietf.org/arch/msg/multipathtcp/v7T4ptKsq9nI7BoZaeADggg13bQ>
Subject: Re: [multipathtcp] Regarding rate control at a subflow level
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Hi Phil,

On Thu, May 30, 2019 at 7:53 PM <philip.eardley@bt.com> wrote:

> I think the use case a hybrid operator could be interested in is the
> following. Similar to Alexander's use case.
>
> We want to provide a particular customer with broadband access that is
> faster than their DSL alone can provide, for instance to meet some minimu=
m
> rate to meet a target of say 20Mbps. The rate can't quite be met by DSL,
> therefore cellular or even satellite is used as a top-up. DSL capacity is
> much cheaper than cellular /satellite, therefore the ideal scheduler woul=
d
> favour DSL.


This is exactly the type of deployments that we have on the field.


> It would react reasonably quickly to increased total load above the DSL
> rate (but not so fast that the instantaneous rate from a variable rate
> source 'kicks in' the cellular when the rate over a slightly longer time
> can be met by DSL).


There are 2 possible levels: (1) macro: create a subflow when the load
reaches the DSL rate and (2) micro: schedule packets first on the DSL
subflow.
For (1) the CPE monitors the load on the DSL link  If the load is lower
than a minimum threshold, then no subflow is established over the LTE
network. If the load is above a maximum threshold, the CPE creates an
additional subflow over the LTE network. Note that (2) is always enabled as
as soon as the 2 subflows are available, the packet scheduler becomes
important. It first tries to fill the DSL link and once it is full, it
overflows over the LTE subflow.
We have deployments where (1) and (2) are enabled and others where only (2)
is enables. What is always important for a customer is that a Speedtest
always display the aggregated speed. In the first deployment mode, the
speed is increased in the middle of the test while with the second mode the
boost is observed directly.


> Note that the DSL rate is not completely static.  It supports deployments
> with a proxy in the home gateway and in the network (under the control of
> the operator),


This corresponds to the currently deployed Hybrid Access Networks.


> and deployments where there's only the proxy in the network (ie MPTCP is
> in the multi-interface phone).


This corresponds to the future ATSSS service in 5G networks that
will leverage the 0-rtt convert protocol that was started in the mptcp
working group and is now discussed within the tcpm working group.


> Possible to ensure that an individual flow goes over only one access.
> Downward direction (from network to house) more important than upward.  I=
n
> a long-running session using a lot of bandwidth, because the amount of
> other traffic varies, it may be that this session sometimes uses just the
> DSL and sometimes is spread over both accesses.


Our experience shows that the scheduler that prioritises the DSL link is
sufficient to ensure that the traffic automatically moves to the DSL
network when the load decreases.


> On a minor point, ideally a speed test should measure the rate correctly
> (I don=E2=80=99t mean the scheduler identifies a speed test and favours i=
t; rather,
> ideally the speed test shouldn=E2=80=99t eg measure just the DSL rate -
> alternatively re-define the speed test).
>

The Ookla speedtest is considered as the reference tool by customer and
typically opens n parallel TCP connections to saturate the available
network. Each of these connections typically creates and additional subflow
and both the DSL and the LTE link are used and tested. As said above, when
using the second deployment mode, both the DSL and the aggregated speed can
be seen but is is often tricky to tune properly. It could therefore be
interesting to think about a different and more reliable methodology to
measure hybrid access networks.


> So in terms of Olivier's question below, I think this means that the limi=
t
> is about the total and not per subflow.
>

Looking at the downstream traffic, it seems that you need to limit the rate
of the incoming traffic towards a specific IP address. This can be
implemented on the internet facing side of a HAG. This way, the total rate
of the DSL+LTE is limited because the split of the traffic is done in the
HAG (DSL is filled first). This can be done locally on the HAG and does not
require any MPTCP signalling. If IPv4 and IPv6 are used, then the rate
should apply to all the addresses assigned to the same CPE.


> In terms of mechanism, I'm open to whatever is most suitable. I'm very
> interested if the best method would mean that ideally some new
> functionality is added to the MPTCP standard (and by implication to
> MP-QUIC).
>

It is possible to add signaling to MPTCP and MPQUIC, but those signals
operate on a per-connection basis. It is difficult to have a signal that
affects a group of connections. Another point that needs to be addressed is
the trust of the device that sends the signal. In an hybrid access network,
should the CPE send inside an MPTCP option the maximum rate at which the
HAG should deliver data ? If you trust all CPEs, maybe, but if customers
can select their own CPE or modify them, there are some risks which such
signals...


>
> Best wishes,
> phil
>
>
> -----Original Message-----
> From: multipathtcp [mailto:multipathtcp-bounces@ietf.org] On Behalf Of
> Christoph Paasch
> Sent: 20 May 2019 14:50
> To: Olivier Bonaventure <olivier.bonaventure@uclouvain.be>
> Cc: multipathtcp@ietf.org; Ashutosh prakash <ashutosh.prakash@huawei.com>=
;
> Nagesh shamnur <nagesh.shamnur@huawei.com>
> Subject: Re: [multipathtcp] Regarding rate control at a subflow level
>
> Hello,
>
> On 17/05/19 - 09:59:54, Olivier Bonaventure wrote:
> > Dear Nagesh,
> > >
> > >                  Greetings. In case of Mobile deployments of MPTCP,
> > > though the data rates are getting cheaper, still it would be wise
> > > not to run the cellular path to full limit but to throttle to a
> > > certain extent considering cost in mind or if server wants to limit
> > > the client at subflow level, then I couldn=E2=80=99t find the support=
 for
> > > the same in the specification.
> >
> > We have developed several prototypes that include this capability in
> > the Linux kernel.
> >
> > > So, while going through the discussion archives, could only find
> > > that, the peer(server) can throttle the speed for the entire
> > > connection by publishing a smaller receiver window rather than for a
> > > particular subflow. I feel, it would be a good idea if the peers can
> > > exchange this information using the control packets.
> >
> > We could imagine an MPTCP option that provides the maximum rate on a
> > per-subflow level, but I was wondering whether the use case is not to
> > limit the bandwidth on the smartphone at the link level (i.e. multiple
> > tcp connections or udp flows) and not at the subflow level. Could you
> > precise your use case for the subflow level ?
>
> another use-case for rate-control I see is when a client wants to tell a
> sender to gracefully close a subflow.
>
> - Sending a TCP-RST results in packet-loss of the in-flight data.
> - Reducing the window is going to stall the whole connection because the
> window is shared.
> - Setting MP_PRIO also won't work because none might want to drain a
> secondary
>   subflow even if the "primary" subflow is having severe packet-loss.
>
> Thus, a "maximum-rate" option on a per-subflow level would allow to send
> the rate to 0, which would drain the subflow.
>
>
> Christoph
>
> _______________________________________________
> multipathtcp mailing list
> multipathtcp@ietf.org
> https://www.ietf.org/mailman/listinfo/multipathtcp
> _______________________________________________
> multipathtcp mailing list
> multipathtcp@ietf.org
> https://www.ietf.org/mailman/listinfo/multipathtcp
>


--=20
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nder
& CTO
gregory.detal@tessares.net | +32 486 83 50 51 <gregory.detal%40tessares.net=
>
Tessares SA | Hybrid Access Solutions
www.tessares.net
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<div dir=3D"ltr"><div dir=3D"ltr">Hi Phil,</div><br><div class=3D"gmail_quo=
te"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, May 30, 2019 at 7:53 PM &=
lt;<a href=3D"mailto:philip.eardley@bt.com" target=3D"_blank">philip.eardle=
y@bt.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-le=
ft:1ex">I think the use case a hybrid operator could be interested in is th=
e following. Similar to Alexander&#39;s use case.<br>
<br>
We want to provide a particular customer with broadband access that is fast=
er than their DSL alone can provide, for instance to meet some minimum rate=
 to meet a target of say 20Mbps. The rate can&#39;t quite be met by DSL, th=
erefore cellular or even satellite is used as a top-up. DSL capacity is muc=
h cheaper than cellular /satellite, therefore the ideal scheduler would fav=
our DSL. </blockquote><div><br></div><div>This is exactly the type of deplo=
yments that we have on the field.</div><div>=C2=A0</div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex">It would react reasonably quickly to incre=
ased total load above the DSL rate (but not so fast that the instantaneous =
rate from a variable rate source &#39;kicks in&#39; the cellular when the r=
ate over a slightly longer time can be met by DSL). </blockquote><div><br><=
/div><div>There are 2 possible levels: (1) macro: create a subflow when the=
 load reaches the DSL rate and (2) micro: schedule packets first on the DSL=
 subflow.=C2=A0<br>For (1) the CPE monitors the load on the DSL link=C2=A0 =
If the load is lower than a minimum threshold, then no subflow is establish=
ed over the LTE network. If the load is above a maximum threshold, the CPE =
creates an additional subflow over the LTE network. Note that (2) is always=
 enabled as as soon as the 2 subflows are available, the packet scheduler b=
ecomes important. It first tries to fill the DSL link and once it is full, =
it overflows over the LTE subflow.</div><div>We have deployments where (1) =
and (2) are enabled and others where only (2) is enables. What is always im=
portant for a customer is that a Speedtest always display the aggregated sp=
eed. In the first deployment mode, the speed is increased in the middle of =
the test while with the second mode the boost is observed directly.</div><d=
iv>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0p=
x 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Note that =
the DSL rate is not completely static.=C2=A0 It supports deployments with a=
 proxy in the home gateway and in the network (under the control of the ope=
rator),</blockquote><div><br></div><div>This corresponds to the currently d=
eployed Hybrid Access Networks.<br></div><div>=C2=A0</div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"> and deployments where there&#39;s only th=
e proxy in the network (ie MPTCP is in the multi-interface phone).</blockqu=
ote><div><br></div><div>This corresponds to the future ATSSS service in 5G =
networks that will=C2=A0leverage the 0-rtt convert protocol that was starte=
d in the mptcp working group and is now discussed within the tcpm working g=
roup.<br></div><div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"=
margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-lef=
t:1ex"> Possible to ensure that an individual flow goes over only one acces=
s. Downward direction (from network to house) more important than upward.=
=C2=A0 In a long-running session using a lot of bandwidth, because the amou=
nt of other traffic varies, it may be that this session sometimes uses just=
 the DSL and sometimes is spread over both accesses. </blockquote><div><br>=
</div><div>Our experience shows that the scheduler that prioritises the DSL=
 link is sufficient to ensure that the traffic automatically moves to the D=
SL network when the load=C2=A0decreases.<br></div><div>=C2=A0</div><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px=
 solid rgb(204,204,204);padding-left:1ex">On a minor point, ideally a speed=
 test should measure the rate correctly (I don=E2=80=99t mean the scheduler=
 identifies a speed test and favours it; rather, ideally the speed test sho=
uldn=E2=80=99t eg measure just the DSL rate - alternatively re-define the s=
peed test). <br></blockquote><div><br></div><div>The Ookla speedtest is con=
sidered as the reference tool by customer and typically opens n parallel TC=
P connections to=C2=A0saturate the available network. Each of these connect=
ions typically creates and additional subflow and both the DSL and the LTE =
link are used and tested. As said above, when using the second deployment m=
ode, both the DSL and the aggregated speed can be seen but is is often tric=
ky to tune properly. It could therefore be interesting to think about a dif=
ferent and more reliable methodology to measure hybrid access networks.</di=
v><div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
So in terms of Olivier&#39;s question below, I think this means that the li=
mit is about the total and not per subflow. <br></blockquote><div><br></div=
>Looking at the downstream traffic, it seems that you need to limit the rat=
e of the incoming traffic towards a specific IP address. This can be implem=
ented on the internet facing side of a HAG. This way, the total=C2=A0rate o=
f the DSL+LTE is limited because the split of the traffic is done in the HA=
G (DSL is filled first). This can be done locally on the HAG and does not r=
equire any MPTCP=C2=A0signalling. If IPv4 and IPv6 are used, then the rate =
should apply to all the addresses assigned to the same CPE.</div><div class=
=3D"gmail_quote"><br></div><div class=3D"gmail_quote"><blockquote class=3D"=
gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex">
<br>
In terms of mechanism, I&#39;m open to whatever is most suitable. I&#39;m v=
ery interested if the best method would mean that ideally some new function=
ality is added to the MPTCP standard (and by implication to MP-QUIC).<br></=
blockquote><div><br></div><div>It is possible to add signaling to MPTCP and=
 MPQUIC, but those signals operate on a per-connection basis. It is difficu=
lt to have a signal that affects a group of connections. Another point that=
 needs to be addressed is the trust of the device that sends the signal. In=
 an hybrid access network, should the CPE send inside an MPTCP option the m=
aximum rate at which the HAG should deliver data ? If you trust all CPEs, m=
aybe, but if customers can select their own CPE or modify them, there are s=
ome risks which such signals...<br></div><div>=C2=A0</div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex">
<br>
Best wishes,<br>
phil<br>
<br>
<br>
-----Original Message-----<br>
From: multipathtcp [mailto:<a href=3D"mailto:multipathtcp-bounces@ietf.org"=
 target=3D"_blank">multipathtcp-bounces@ietf.org</a>] On Behalf Of Christop=
h Paasch<br>
Sent: 20 May 2019 14:50<br>
To: Olivier Bonaventure &lt;<a href=3D"mailto:olivier.bonaventure@uclouvain=
.be" target=3D"_blank">olivier.bonaventure@uclouvain.be</a>&gt;<br>
Cc: <a href=3D"mailto:multipathtcp@ietf.org" target=3D"_blank">multipathtcp=
@ietf.org</a>; Ashutosh prakash &lt;<a href=3D"mailto:ashutosh.prakash@huaw=
ei.com" target=3D"_blank">ashutosh.prakash@huawei.com</a>&gt;; Nagesh shamn=
ur &lt;<a href=3D"mailto:nagesh.shamnur@huawei.com" target=3D"_blank">nages=
h.shamnur@huawei.com</a>&gt;<br>
Subject: Re: [multipathtcp] Regarding rate control at a subflow level<br>
<br>
Hello,<br>
<br>
On 17/05/19 - 09:59:54, Olivier Bonaventure wrote:<br>
&gt; Dear Nagesh,<br>
&gt; &gt; <br>
&gt; &gt;=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 Greetings. In case of Mobile deployments =
of MPTCP, <br>
&gt; &gt; though the data rates are getting cheaper, still it would be wise=
 <br>
&gt; &gt; not to run the cellular path to full limit but to throttle to a <=
br>
&gt; &gt; certain extent considering cost in mind or if server wants to lim=
it <br>
&gt; &gt; the client at subflow level, then I couldn=E2=80=99t find the sup=
port for <br>
&gt; &gt; the same in the specification.<br>
&gt; <br>
&gt; We have developed several prototypes that include this capability in <=
br>
&gt; the Linux kernel.<br>
&gt; <br>
&gt; &gt; So, while going through the discussion archives, could only find =
<br>
&gt; &gt; that, the peer(server) can throttle the speed for the entire <br>
&gt; &gt; connection by publishing a smaller receiver window rather than fo=
r a <br>
&gt; &gt; particular subflow. I feel, it would be a good idea if the peers =
can <br>
&gt; &gt; exchange this information using the control packets.<br>
&gt; <br>
&gt; We could imagine an MPTCP option that provides the maximum rate on a <=
br>
&gt; per-subflow level, but I was wondering whether the use case is not to =
<br>
&gt; limit the bandwidth on the smartphone at the link level (i.e. multiple=
 <br>
&gt; tcp connections or udp flows) and not at the subflow level. Could you =
<br>
&gt; precise your use case for the subflow level ?<br>
<br>
another use-case for rate-control I see is when a client wants to tell a se=
nder to gracefully close a subflow.<br>
<br>
- Sending a TCP-RST results in packet-loss of the in-flight data.<br>
- Reducing the window is going to stall the whole connection because the wi=
ndow is shared.<br>
- Setting MP_PRIO also won&#39;t work because none might want to drain a se=
condary<br>
=C2=A0 subflow even if the &quot;primary&quot; subflow is having severe pac=
ket-loss.<br>
<br>
Thus, a &quot;maximum-rate&quot; option on a per-subflow level would allow =
to send the rate to 0, which would drain the subflow.<br>
<br>
<br>
Christoph<br>
<br>
_______________________________________________<br>
multipathtcp mailing list<br>
<a href=3D"mailto:multipathtcp@ietf.org" target=3D"_blank">multipathtcp@iet=
f.org</a><br>
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errer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/multipathtcp=
</a><br>
_______________________________________________<br>
multipathtcp mailing list<br>
<a href=3D"mailto:multipathtcp@ietf.org" target=3D"_blank">multipathtcp@iet=
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From nobody Thu Jun  6 09:32:42 2019
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Date: Thu, 6 Jun 2019 11:32:22 -0500
From: Benjamin Kaduk <kaduk@mit.edu>
To: draft-ietf-mptcp-rfc6824bis@ietf.org
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Subject: [multipathtcp] HMAC output size in draft-ietf-mptcp-rfc6824bis-15 (plus other comments) (with COMMENT)
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Hi all,

Éric's comment prompted me to take a look, even though I was on vacation
for the telechat in question.  More below...

On Thu, May 16, 2019 at 01:15:40AM -0700, Éric Vyncke via Datatracker wrote:
> Éric Vyncke has entered the following ballot position for
> draft-ietf-mptcp-rfc6824bis-15: No Objection
> 
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
> 
[...]
> 
> I am also trusting my SEC AD peers about whether the fixed length of the
> 160-bit HMAC/ 32-bit random number fields will still be valid in the future.

It seems that this may just be a relic of the switch from SHA-1 to SHA-256,
since the SHA-1 output is 160 bits and SHA-256's is, well, 256 bits.
However, I'm concerned that the document is ambiguous about constructing
the HMAC field in MP_JOIN.  It may just be an editorial matter and easily
resolved, but I cannot state so with confidence without further input.

In particular, Figure 7 refers to a 160-bit field for the HMAC (which
would match with the usage of HMAC-SHA-1 in RFC 6824), but there is
no mention of truncating the SHA-256 HMAC in the body text (we do have
such discussion for the generation of tokens and IDSNs).  Are
implementations truncating from 256 to 160 bits for this message or
sending the full 256?  It also seems important to know whether there's
enough room in the TCP options space for it all to fit, but I didn't get
a chance to try to chase that down.  There's also a note in the body text
in Section 3.2 that still talks about "generating a 160-bit / 20-octet
HMAC" from SHA-256, which should get updated.

I also made some other notes while reading through for the crypto
perspective, which would have gone in the Comment section if I had balloted
in time:

I appreciate the discussion of what happens when Address ID 0 is
removed; that saves me from having to ask about it.

Section 3.1

   prefer not to attempt a v0 connection.  An initiator MAY cache
   information for a peer about what version of MPTCP it supports if
   any, and use this information for future connection attempts.

I'm a bit surprised to not see guidance here for how long to cache
(specifically here and not most other places in the document), since
this might affect "baseline load" in some environments.

Section 3.2

   packets) that is used as the "message".  This specification defines
   that HMAC as defined in [RFC2104] is used, along with the SHA-256
   hash algorithm [RFC6234], thus generating a 160-bit / 20-octet HMAC.
   Due to option space limitations, the HMAC included in the SYN/ACK is

[As noted in the Discuss section, SHA-256 HMACs will be 256 bits/32 octets.]

   Although calculating an HMAC requires cryptographic operations, it is
   believed that the 32-bit token in the MP_JOIN SYN gives sufficient
   protection against blind state exhaustion attacks; therefore, there
   is no need to provide mechanisms to allow a responder to operate
   statelessly at the MP_JOIN stage.

I would have liked to see some discussion in the security considerations
about what probability of success an attacker has at brute-forcing this
(as compared to port/sequence-number guessing attacks on plain TCP).

   Due to option space limitations, the HMAC included in the SYN/ACK is
   truncated to the leftmost 64 bits, but this is acceptable since
   random numbers are used; thus, an attacker only has one chance to
   guess the HMAC correctly (if the HMAC is incorrect, the TCP
   connection is closed, so a new MP_JOIN negotiation with a new random
   number is required).

nit: I think this might be more clear if we clarified that this is "only
one chance to guess the HMAC that matches the nonce previously sent by
the peer" -- each party commits to a nonce before the HMAC is generated,
and requires the received HMAC to match that nonce.

   The key for the HMAC algorithm, in the case of the message
   transmitted by Host A, will be Key-A followed by Key-B, and in the
   case of Host B, Key-B followed by Key-A.  These are the keys that
   were exchanged in the original MP_CAPABLE handshake.  The "message"

This is a little dicey in theory in terms of putting underlying
structure in the HMAC key and the risk of related key attacks, but for
SHA-256 I don't know of any specific hazards.  Key
combination/derivation methods such as HKDF would alleviate this (mostly
theoretical) risk, but given that the goal is "not worse than TCP" I
don't see a need to insist upon them here.

   If the HMACs are verified as correct, then both hosts have
   authenticated each other as being the same peers as existed at the
   start of the connection, and they have agreed of which connection
   this subflow will become a part.

nit: there's not much notion of "identity" here, so I'd suggest using a
verb like "verified" or "assured" rather than
"authenticated", e.g., "both hosts have provided assurance to each other
that they are the same peers as existed at the start of the connection".

Section 3.3

   The 'F' flag indicates "Data FIN".  If present, this means that this
   mapping covers the final data from the sender.  This is the
   connection-level equivalent to the FIN flag in single-path TCP.  A
   connection is not closed unless there has been a Data FIN exchange,
   or an implementation-specific, connection-level timeout.  [...]

Is this really appropriate to lave implementation-specific, since it
could result in peers disagreeing about whether a connection is closed?

                       The presence of the checksum can be inferred from
   the length of the option.  If a checksum is present, but its use had
   not been negotiated in the MP_CAPABLE handshake, the checksum field
   MUST be ignored.  [...]

Why is ignoring better than RST-ing?  We abort on other cases of
tampering, IIUC.

Section 3.3.1

   The data sequence mapping specifies a mapping from subflow sequence
   space to data sequence space.  This is expressed in terms of starting
   sequence numbers for the subflow and the data level, and a length of
   bytes for which this mapping is valid.  This explicit mapping for a
   range of data was chosen rather than per-packet signaling to assist
   with compatibility with situations where TCP/IP segmentation or
   coalescing is undertaken separately from the stack that is generating
   the data flow (e.g., through the use of TCP segmentation offloading
   on network interface cards, or by middleboxes such as performance
   enhancing proxies).  [...]

What happens if the resegmentation/coalescing causes the end of the data
mapping to fall in the middle of a segment but checksums are not enabled?
There's some discussion of this scenario in Section 3.7 and a note that
the checksums would detect this but without checksums only a signal at a
different layer would detect tampering.  It might be worth discussing
the consequences (corruption in the application stream?) if no such
signal is available.

Section 3.4.1

   Due to the proliferation of NATs, it is reasonably likely that one
   host may attempt to advertise private addresses [RFC1918].  It is not
   desirable to prohibit this, since there may be cases where both hosts
   have additional interfaces on the same private network, and a host
   MAY want to advertise such addresses.  The MP_JOIN handshake to
   create a new subflow (Section 3.2) provides mechanisms to minimize
   security risks.  The MP_JOIN message contains a 32-bit token that
   uniquely identifies the connection to the receiving host.  If the
   token is unknown, the host will return with a RST.  In the unlikely
   event that the token is valid at the receiving host, subflow setup
   will continue, but the HMAC exchange must occur for authentication.

nit: I don't think we actually specified that this is for the case of
hosts on different private networks using the same private address
range, so "unlikely event" comes as a surprise.

Section 5

   original connection setup.  It also provides verification that the
   peer can receive traffic at this new address.  Replay attacks would
   still be possible when only keys are used; therefore, the handshakes
   use single-use random numbers (nonces) at both ends -- this ensures
   the HMAC will never be the same on two handshakes.  Guidance on

I think it's worth saying a bit more about the "single-use" property
and that the party generating the nonce can discard it in bounded time,
since the message reacting to the nonce will have aged out.
On the other hand, generally when we use this sort of time-bounded
mechanism with nonces we do still need to take steps to ensure
consistent behavior within the replay window, e.g., cache the packet
to ensure that any duplicates received are true retransmits and not
an attacker having won a race with the real recipient.

   The use of crypto capability bits in the initial connection handshake
   to negotiate use of a particular algorithm allows the deployment of
   additional crypto mechanisms in the future.  Note that this
   negotiation would be susceptible to a bid-down attack by an on-path
   active attacker who could modify the crypto capability bits response
   from the receiver to use a less secure crypto mechanism.  The
   security mechanism presented in this document should therefore
   protect against all forms of flooding and hijacking attacks discussed
   in [RFC6181].

Nit: the language used here is weird, since we "note that" there's an
additional attack, but then conclude ("should therefore") that all
attacks are covered.  So perhaps "nonetheless" is a better conjunction,
to show that the remaining attack is not one discussed in 6181?

   The version negotiation specified in Section 3.1, if differing MPTCP
   versions shared a common negotiation format, would allow an on-path
   attacker to apply a theoretical bid-down attack.  Since the v1 and v0
   protocols have a different handshake, such an attack would require
   the client to re-establish the connection using v0, and this being
   supported by the server.  Note that an on-path attacker would have
   access to the raw data, negating any other TCP-level security
   mechanisms.  [...]

It is perhaps worth distinguishing between an on-path attacker that can
freely modify/add/discard all traffic from one that can freely inject
but not block traffic.

   Whilst this specification defines a "medium" security solution,
   meeting the criteria specified at the start of this section and the
   threat analysis ([RFC6181]), since attacks only ever get worse, it is
   likely that a future Standards Track version of MPTCP would need to
   be able to support stronger security.  [...]

nit: this *is* a standards-track version; just "future version" will
be fine.

Appendix B.3

   Once this is done, the received cookie can be used for TFO, as shown
   in Figure Figure 19.  [...]

nit: "Figure Figure" is redundantly redundant.  (Also in later
references.)

Appendix C.1.1

   Local.Token (32 bits):  This is the token chosen by the local host on
      this MPTCP connection.  The token must be unique among all
      established MPTCP connections, generated from the local key.

nit: I think this is "and is generated from the local key" -- the
uniqueness is about all MPTCP connections on the host, not just
those using a given key.  (This follows naturally from the deterministic
procedure used to generate the token from the key, but we should still
be precise with our language.)


Thanks!

-Ben


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Subject: [multipathtcp] Alissa Cooper's No Objection on draft-ietf-mptcp-rfc6824bis-17: (with COMMENT)
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Alissa Cooper has entered the following ballot position for
draft-ietf-mptcp-rfc6824bis-17: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Thanks for addressing my DISCUSS and comments.



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Date: Sat, 8 Jun 2019 11:21:46 +0100
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Cc: draft-ietf-mptcp-rfc6824bis@ietf.org, The IESG <iesg@ietf.org>, multipathtcp@ietf.org, philip.eardley@bt.com, mptcp-chairs@ietf.org
To: Benjamin Kaduk <kaduk@mit.edu>
References: <20190606163222.GB23396@kduck.mit.edu>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/multipathtcp/BA8ggBgo78_tUDdm1UUHV15ILX0>
Subject: Re: [multipathtcp] HMAC output size in draft-ietf-mptcp-rfc6824bis-15 (plus other comments) (with COMMENT)
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Hi Ben,

Thank you very much for your detailed comments. My responses are inline, =
and a -18 rev is about to appear with the changes included.

> It seems that this may just be a relic of the switch from SHA-1 to =
SHA-256,
> since the SHA-1 output is 160 bits and SHA-256's is, well, 256 bits.
> However, I'm concerned that the document is ambiguous about =
constructing
> the HMAC field in MP_JOIN.  It may just be an editorial matter and =
easily
> resolved, but I cannot state so with confidence without further input.
>=20
> In particular, Figure 7 refers to a 160-bit field for the HMAC (which
> would match with the usage of HMAC-SHA-1 in RFC 6824), but there is
> no mention of truncating the SHA-256 HMAC in the body text (we do have
> such discussion for the generation of tokens and IDSNs).  Are
> implementations truncating from 256 to 160 bits for this message or
> sending the full 256?  It also seems important to know whether there's
> enough room in the TCP options space for it all to fit, but I didn't =
get
> a chance to try to chase that down.  There's also a note in the body =
text
> in Section 3.2 that still talks about "generating a 160-bit / 20-octet
> HMAC" from SHA-256, which should get updated.

Great catches, than you. This will remain 160 bits due to option space =
limitations, but shall be truncated as per RFC2104 (i.e. leftmost bits). =
I will clarify in the text.

> I also made some other notes while reading through for the crypto
> perspective, which would have gone in the Comment section if I had =
balloted
> in time:
>=20
> I appreciate the discussion of what happens when Address ID 0 is
> removed; that saves me from having to ask about it.
>=20
> Section 3.1
>=20
>   prefer not to attempt a v0 connection.  An initiator MAY cache
>   information for a peer about what version of MPTCP it supports if
>   any, and use this information for future connection attempts.
>=20
> I'm a bit surprised to not see guidance here for how long to cache
> (specifically here and not most other places in the document), since
> this might affect "baseline load" in some environments.

That=E2=80=99s kinda the reason why we don=E2=80=99t go into detail! =
This statement is a MAY, as a suggestion that an implementation may wish =
to do this. There may be different reasons for an implementation =
choosing to do this, and certain environmental limitations that mean =
that it is not appropriate.

> Section 3.2
>=20
>   packets) that is used as the "message".  This specification defines
>   that HMAC as defined in [RFC2104] is used, along with the SHA-256
>   hash algorithm [RFC6234], thus generating a 160-bit / 20-octet HMAC.
>   Due to option space limitations, the HMAC included in the SYN/ACK is
>=20
> [As noted in the Discuss section, SHA-256 HMACs will be 256 bits/32 =
octets.]
>=20
>   Although calculating an HMAC requires cryptographic operations, it =
is
>   believed that the 32-bit token in the MP_JOIN SYN gives sufficient
>   protection against blind state exhaustion attacks; therefore, there
>   is no need to provide mechanisms to allow a responder to operate
>   statelessly at the MP_JOIN stage.
>=20
> I would have liked to see some discussion in the security =
considerations
> about what probability of success an attacker has at brute-forcing =
this
> (as compared to port/sequence-number guessing attacks on plain TCP).

Whilst I=E2=80=99m not sure it=E2=80=99s directly comparable, we can add =
something like =E2=80=9CThis is in comparison to state exhaustion on a =
TCP port, where the port is typically already known, and SYN cookies can =
be deployed to aid in stateless operation.=E2=80=9D although I am not =
sure this would add anything. I think saying anything like =E2=80=9Cthis =
is 65536 times more secure=E2=80=9C would be disingenuous given MPTCP =
tokens are random but TCP ports are typically well-known.

>   Due to option space limitations, the HMAC included in the SYN/ACK is
>   truncated to the leftmost 64 bits, but this is acceptable since
>   random numbers are used; thus, an attacker only has one chance to
>   guess the HMAC correctly (if the HMAC is incorrect, the TCP
>   connection is closed, so a new MP_JOIN negotiation with a new random
>   number is required).
>=20
> nit: I think this might be more clear if we clarified that this is =
"only
> one chance to guess the HMAC that matches the nonce previously sent by
> the peer" -- each party commits to a nonce before the HMAC is =
generated,
> and requires the received HMAC to match that nonce.

Thank you!

>   The key for the HMAC algorithm, in the case of the message
>   transmitted by Host A, will be Key-A followed by Key-B, and in the
>   case of Host B, Key-B followed by Key-A.  These are the keys that
>   were exchanged in the original MP_CAPABLE handshake.  The "message"
>=20
> This is a little dicey in theory in terms of putting underlying
> structure in the HMAC key and the risk of related key attacks, but for
> SHA-256 I don't know of any specific hazards.  Key
> combination/derivation methods such as HKDF would alleviate this =
(mostly
> theoretical) risk, but given that the goal is "not worse than TCP" I
> don't see a need to insist upon them here.

Thanks for the pointer here. I think this would be inappropriate to =
introduce at this stage given lack of real-world experience and =
especially since the impact on =E2=80=9Cfriendly=E2=80=9D middleboxes =
may cause issues, and as you say is not required to meet our security =
goals. But it=E2=80=99s a great pointer for future evolutions of this =
spec.

>   If the HMACs are verified as correct, then both hosts have
>   authenticated each other as being the same peers as existed at the
>   start of the connection, and they have agreed of which connection
>   this subflow will become a part.
>=20
> nit: there's not much notion of "identity" here, so I'd suggest using =
a
> verb like "verified" or "assured" rather than
> "authenticated", e.g., "both hosts have provided assurance to each =
other
> that they are the same peers as existed at the start of the =
connection=E2=80=9D.

Thank you.

> Section 3.3
>=20
>   The 'F' flag indicates "Data FIN".  If present, this means that this
>   mapping covers the final data from the sender.  This is the
>   connection-level equivalent to the FIN flag in single-path TCP.  A
>   connection is not closed unless there has been a Data FIN exchange,
>   or an implementation-specific, connection-level timeout.  [...]
>=20
> Is this really appropriate to lave implementation-specific, since it
> could result in peers disagreeing about whether a connection is =
closed?

These kinds of issues happen all the time in TCP today as different =
implementations or network conditions may lead to ends timing out at =
different points. This will be discovered by the peer through a TCP RST. =
The text existed primarily to cover MPTCP scenarios equivalent to those =
found in TCP today. However, this text pre-dates the MP_FASTCLOSE =
method, which would be preferred in this environment, and so I=E2=80=99ve =
clarified this is a send timeout and also pointed to MP_FASTCLOSE as =
another option.

>                       The presence of the checksum can be inferred =
from
>   the length of the option.  If a checksum is present, but its use had
>   not been negotiated in the MP_CAPABLE handshake, the checksum field
>   MUST be ignored.  [...]
>=20
> Why is ignoring better than RST-ing?  We abort on other cases of
> tampering, IIUC.

Hmm, I guess you could call this tampering (adding an unexpected field)! =
I think the rationale here was if an implementation for some reason =
misunderstood the negotiation, or was lazy and just checksummed =
everything, then a receiver should just not care. But for consistency it =
seems right to close the connection, so we can change that.

> Section 3.3.1
>=20
>   The data sequence mapping specifies a mapping from subflow sequence
>   space to data sequence space.  This is expressed in terms of =
starting
>   sequence numbers for the subflow and the data level, and a length of
>   bytes for which this mapping is valid.  This explicit mapping for a
>   range of data was chosen rather than per-packet signaling to assist
>   with compatibility with situations where TCP/IP segmentation or
>   coalescing is undertaken separately from the stack that is =
generating
>   the data flow (e.g., through the use of TCP segmentation offloading
>   on network interface cards, or by middleboxes such as performance
>   enhancing proxies).  [...]
>=20
> What happens if the resegmentation/coalescing causes the end of the =
data
> mapping to fall in the middle of a segment but checksums are not =
enabled?
> There's some discussion of this scenario in Section 3.7 and a note =
that
> the checksums would detect this but without checksums only a signal at =
a
> different layer would detect tampering.  It might be worth discussing
> the consequences (corruption in the application stream?) if no such
> signal is available.

Thanks for the thought. This kind of thing is implied in various places =
but it is probably worth spelling out. So I have added the following two =
sentences to this paragraph: "Without checksumming enabled, corrupt data =
may be delivered to the application if a middlebox alters segment =
boundaries, alters content, or does not deliver all segments covered by =
a data sequence mapping. It is therefore RECOMMENDED to use checksumming =
unless it is known the network path contains no such devices.<"

> Section 3.4.1
>=20
>   Due to the proliferation of NATs, it is reasonably likely that one
>   host may attempt to advertise private addresses [RFC1918].  It is =
not
>   desirable to prohibit this, since there may be cases where both =
hosts
>   have additional interfaces on the same private network, and a host
>   MAY want to advertise such addresses.  The MP_JOIN handshake to
>   create a new subflow (Section 3.2) provides mechanisms to minimize
>   security risks.  The MP_JOIN message contains a 32-bit token that
>   uniquely identifies the connection to the receiving host.  If the
>   token is unknown, the host will return with a RST.  In the unlikely
>   event that the token is valid at the receiving host, subflow setup
>   will continue, but the HMAC exchange must occur for authentication.
>=20
> nit: I don't think we actually specified that this is for the case of
> hosts on different private networks using the same private address
> range, so "unlikely event" comes as a surprise.

I don=E2=80=99t quite understand this comment. This text refers to a =
clash of 32-bit tokens (which are hashes and should be fairly random). =
If for the purposes of this exercise they are truly random, the =
probability of such a clash would be 1 in 2147483648 - that seems =
reasonably unlikely to me!

> Section 5
>=20
>   original connection setup.  It also provides verification that the
>   peer can receive traffic at this new address.  Replay attacks would
>   still be possible when only keys are used; therefore, the handshakes
>   use single-use random numbers (nonces) at both ends -- this ensures
>   the HMAC will never be the same on two handshakes.  Guidance on
>=20
> I think it's worth saying a bit more about the "single-use" property
> and that the party generating the nonce can discard it in bounded =
time,
> since the message reacting to the nonce will have aged out.
> On the other hand, generally when we use this sort of time-bounded
> mechanism with nonces we do still need to take steps to ensure
> consistent behavior within the replay window, e.g., cache the packet
> to ensure that any duplicates received are true retransmits and not
> an attacker having won a race with the real recipient.

Added a comment about nonce lifetime being in the lifetime of the TCP =
handshake.

>   The use of crypto capability bits in the initial connection =
handshake
>   to negotiate use of a particular algorithm allows the deployment of
>   additional crypto mechanisms in the future.  Note that this
>   negotiation would be susceptible to a bid-down attack by an on-path
>   active attacker who could modify the crypto capability bits response
>   from the receiver to use a less secure crypto mechanism.  The
>   security mechanism presented in this document should therefore
>   protect against all forms of flooding and hijacking attacks =
discussed
>   in [RFC6181].
>=20
> Nit: the language used here is weird, since we "note that" there's an
> additional attack, but then conclude ("should therefore") that all
> attacks are covered.  So perhaps "nonetheless" is a better =
conjunction,
> to show that the remaining attack is not one discussed in 6181?

Thank you.

>   The version negotiation specified in Section 3.1, if differing MPTCP
>   versions shared a common negotiation format, would allow an on-path
>   attacker to apply a theoretical bid-down attack.  Since the v1 and =
v0
>   protocols have a different handshake, such an attack would require
>   the client to re-establish the connection using v0, and this being
>   supported by the server.  Note that an on-path attacker would have
>   access to the raw data, negating any other TCP-level security
>   mechanisms.  [...]
>=20
> It is perhaps worth distinguishing between an on-path attacker that =
can
> freely modify/add/discard all traffic from one that can freely inject
> but not block traffic.

Most attacks against the MPTCP signalling would have to be on-path. =
Injection attacks would require being in-window with TCP sequence =
numbers so would need some on-path knowledge, or a very lucky guess. The =
additional security mechanisms on MPTCP signalling are designed to =
mitigate against these risks.

>   Whilst this specification defines a "medium" security solution,
>   meeting the criteria specified at the start of this section and the
>   threat analysis ([RFC6181]), since attacks only ever get worse, it =
is
>   likely that a future Standards Track version of MPTCP would need to
>   be able to support stronger security.  [...]
>=20
> nit: this *is* a standards-track version; just "future version" will
> be fine.

Thank you.

> Appendix B.3
>=20
>   Once this is done, the received cookie can be used for TFO, as shown
>   in Figure Figure 19.  [...]
>=20
> nit: "Figure Figure" is redundantly redundant.  (Also in later
> references.)

Thank you.

> Appendix C.1.1
>=20
>   Local.Token (32 bits):  This is the token chosen by the local host =
on
>      this MPTCP connection.  The token must be unique among all
>      established MPTCP connections, generated from the local key.
>=20
> nit: I think this is "and is generated from the local key" -- the
> uniqueness is about all MPTCP connections on the host, not just
> those using a given key.  (This follows naturally from the =
deterministic
> procedure used to generate the token from the key, but we should still
> be precise with our language.)

And thanks again - much appreciated!

Best regards,
Alan


--Apple-Mail=_FEECCD2F-69BB-40EE-B1BE-6CD4022FA43A
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">Hi =
Ben,<div class=3D""><br class=3D""></div><div class=3D"">Thank you very =
much for your detailed comments. My responses are inline, and a -18 rev =
is about to appear with the changes included.<br class=3D""><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"">It seems that this may just be a relic of the switch from =
SHA-1 to SHA-256,<br class=3D"">since the SHA-1 output is 160 bits and =
SHA-256's is, well, 256 bits.<br class=3D"">However, I'm concerned that =
the document is ambiguous about constructing<br class=3D"">the HMAC =
field in MP_JOIN. &nbsp;It may just be an editorial matter and easily<br =
class=3D"">resolved, but I cannot state so with confidence without =
further input.<br class=3D""><br class=3D"">In particular, Figure 7 =
refers to a 160-bit field for the HMAC (which<br class=3D"">would match =
with the usage of HMAC-SHA-1 in RFC 6824), but there is<br class=3D"">no =
mention of truncating the SHA-256 HMAC in the body text (we do have<br =
class=3D"">such discussion for the generation of tokens and IDSNs). =
&nbsp;Are<br class=3D"">implementations truncating from 256 to 160 bits =
for this message or<br class=3D"">sending the full 256? &nbsp;It also =
seems important to know whether there's<br class=3D"">enough room in the =
TCP options space for it all to fit, but I didn't get<br class=3D"">a =
chance to try to chase that down. &nbsp;There's also a note in the body =
text<br class=3D"">in Section 3.2 that still talks about "generating a =
160-bit / 20-octet<br class=3D"">HMAC" from SHA-256, which should get =
updated.<br class=3D""></div></div></blockquote><div><br =
class=3D""></div><div>Great catches, than you. This will remain 160 bits =
due to option space limitations, but shall be truncated as per RFC2104 =
(i.e. leftmost bits). I will clarify in the text.</div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"">I also made some other notes while reading through for the =
crypto<br class=3D"">perspective, which would have gone in the Comment =
section if I had balloted<br class=3D"">in time:<br class=3D""><br =
class=3D"">I appreciate the discussion of what happens when Address ID 0 =
is<br class=3D"">removed; that saves me from having to ask about it.<br =
class=3D""><br class=3D"">Section 3.1<br class=3D""><br class=3D""> =
&nbsp;&nbsp;prefer not to attempt a v0 connection. &nbsp;An initiator =
MAY cache<br class=3D""> &nbsp;&nbsp;information for a peer about what =
version of MPTCP it supports if<br class=3D""> &nbsp;&nbsp;any, and use =
this information for future connection attempts.<br class=3D""><br =
class=3D"">I'm a bit surprised to not see guidance here for how long to =
cache<br class=3D"">(specifically here and not most other places in the =
document), since<br class=3D"">this might affect "baseline load" in some =
environments.<br class=3D""></div></div></blockquote><div><br =
class=3D""></div><div>That=E2=80=99s kinda the reason why we don=E2=80=99t=
 go into detail! This statement is a MAY, as a suggestion that an =
implementation may wish to do this. There may be different reasons for =
an implementation choosing to do this, and certain environmental =
limitations that mean that it is not appropriate.</div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"">Section 3.2<br class=3D""><br class=3D""> =
&nbsp;&nbsp;packets) that is used as the "message". &nbsp;This =
specification defines<br class=3D""> &nbsp;&nbsp;that HMAC as defined in =
[RFC2104] is used, along with the SHA-256<br class=3D""> =
&nbsp;&nbsp;hash algorithm [RFC6234], thus generating a 160-bit / =
20-octet HMAC.<br class=3D""> &nbsp;&nbsp;Due to option space =
limitations, the HMAC included in the SYN/ACK is<br class=3D""><br =
class=3D"">[As noted in the Discuss section, SHA-256 HMACs will be 256 =
bits/32 octets.]<br class=3D""><br class=3D""> &nbsp;&nbsp;Although =
calculating an HMAC requires cryptographic operations, it is<br =
class=3D""> &nbsp;&nbsp;believed that the 32-bit token in the MP_JOIN =
SYN gives sufficient<br class=3D""> &nbsp;&nbsp;protection against blind =
state exhaustion attacks; therefore, there<br class=3D""> &nbsp;&nbsp;is =
no need to provide mechanisms to allow a responder to operate<br =
class=3D""> &nbsp;&nbsp;statelessly at the MP_JOIN stage.<br =
class=3D""><br class=3D"">I would have liked to see some discussion in =
the security considerations<br class=3D"">about what probability of =
success an attacker has at brute-forcing this<br class=3D"">(as compared =
to port/sequence-number guessing attacks on plain TCP).<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>Whilst =
I=E2=80=99m not sure it=E2=80=99s directly comparable, we can add =
something like =E2=80=9CThis is in comparison to state exhaustion on a =
TCP port, where the port is typically already known, and SYN cookies can =
be deployed to aid in stateless operation.=E2=80=9D although I am not =
sure this would add anything. I think saying anything like =E2=80=9Cthis =
is 65536 times more secure=E2=80=9C would be disingenuous given MPTCP =
tokens are random but TCP ports are typically well-known.</div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D""> &nbsp;&nbsp;Due to option space limitations, the HMAC =
included in the SYN/ACK is<br class=3D""> &nbsp;&nbsp;truncated to the =
leftmost 64 bits, but this is acceptable since<br class=3D""> =
&nbsp;&nbsp;random numbers are used; thus, an attacker only has one =
chance to<br class=3D""> &nbsp;&nbsp;guess the HMAC correctly (if the =
HMAC is incorrect, the TCP<br class=3D""> &nbsp;&nbsp;connection is =
closed, so a new MP_JOIN negotiation with a new random<br class=3D""> =
&nbsp;&nbsp;number is required).<br class=3D""><br class=3D"">nit: I =
think this might be more clear if we clarified that this is "only<br =
class=3D"">one chance to guess the HMAC that matches the nonce =
previously sent by<br class=3D"">the peer" -- each party commits to a =
nonce before the HMAC is generated,<br class=3D"">and requires the =
received HMAC to match that nonce.<br =
class=3D""></div></div></blockquote><div><br class=3D""></div>Thank =
you!</div><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><div class=3D"">&nbsp; The key for the HMAC algorithm, in the =
case of the message<br class=3D""> &nbsp;&nbsp;transmitted by Host A, =
will be Key-A followed by Key-B, and in the<br class=3D""> =
&nbsp;&nbsp;case of Host B, Key-B followed by Key-A. &nbsp;These are the =
keys that<br class=3D""> &nbsp;&nbsp;were exchanged in the original =
MP_CAPABLE handshake. &nbsp;The "message"<br class=3D""><br =
class=3D"">This is a little dicey in theory in terms of putting =
underlying<br class=3D"">structure in the HMAC key and the risk of =
related key attacks, but for<br class=3D"">SHA-256 I don't know of any =
specific hazards. &nbsp;Key<br class=3D"">combination/derivation methods =
such as HKDF would alleviate this (mostly<br class=3D"">theoretical) =
risk, but given that the goal is "not worse than TCP" I<br =
class=3D"">don't see a need to insist upon them here.<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>Thanks =
for the pointer here. I think this would be inappropriate to introduce =
at this stage given lack of real-world experience and especially since =
the impact on =E2=80=9Cfriendly=E2=80=9D middleboxes may cause issues, =
and as you say is not required to meet our security goals. But it=E2=80=99=
s a great pointer for future evolutions of this spec.</div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D""> &nbsp;&nbsp;If the HMACs are verified as correct, then both =
hosts have<br class=3D""> &nbsp;&nbsp;authenticated each other as being =
the same peers as existed at the<br class=3D""> &nbsp;&nbsp;start of the =
connection, and they have agreed of which connection<br class=3D""> =
&nbsp;&nbsp;this subflow will become a part.<br class=3D""><br =
class=3D"">nit: there's not much notion of "identity" here, so I'd =
suggest using a<br class=3D"">verb like "verified" or "assured" rather =
than<br class=3D"">"authenticated", e.g., "both hosts have provided =
assurance to each other<br class=3D"">that they are the same peers as =
existed at the start of the connection=E2=80=9D.<br =
class=3D""></div></div></blockquote><div><br class=3D""></div>Thank =
you.<br class=3D""><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D"">Section 3.3<br class=3D""><br =
class=3D""> &nbsp;&nbsp;The 'F' flag indicates "Data FIN". &nbsp;If =
present, this means that this<br class=3D""> &nbsp;&nbsp;mapping covers =
the final data from the sender. &nbsp;This is the<br class=3D""> =
&nbsp;&nbsp;connection-level equivalent to the FIN flag in single-path =
TCP. &nbsp;A<br class=3D""> &nbsp;&nbsp;connection is not closed unless =
there has been a Data FIN exchange,<br class=3D""> &nbsp;&nbsp;or an =
implementation-specific, connection-level timeout. &nbsp;[...]<br =
class=3D""><br class=3D"">Is this really appropriate to lave =
implementation-specific, since it<br class=3D"">could result in peers =
disagreeing about whether a connection is closed?<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>These =
kinds of issues happen all the time in TCP today as different =
implementations or network conditions may lead to ends timing out at =
different points. This will be discovered by the peer through a TCP RST. =
The text existed primarily to cover MPTCP scenarios equivalent to those =
found in TCP today. However, this text pre-dates the MP_FASTCLOSE =
method, which would be preferred in this environment, and so I=E2=80=99ve =
clarified this is a <i class=3D"">send</i>&nbsp;timeout and also pointed =
to MP_FASTCLOSE as another option.</div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><div class=3D""> =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The presence =
of the checksum can be inferred from<br class=3D""> &nbsp;&nbsp;the =
length of the option. &nbsp;If a checksum is present, but its use had<br =
class=3D""> &nbsp;&nbsp;not been negotiated in the MP_CAPABLE handshake, =
the checksum field<br class=3D""> &nbsp;&nbsp;MUST be ignored. =
&nbsp;[...]<br class=3D""><br class=3D"">Why is ignoring better than =
RST-ing? &nbsp;We abort on other cases of<br class=3D"">tampering, =
IIUC.<br class=3D""></div></div></blockquote><div><br =
class=3D""></div><div>Hmm, I guess you could call this tampering (adding =
an unexpected field)! I think the rationale here was if an =
implementation for some reason misunderstood the negotiation, or was =
lazy and just checksummed everything, then a receiver should just not =
care. But for consistency it seems right to close the connection, so we =
can change that.</div><div><br class=3D""></div><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D"">Section 3.3.1<br class=3D""><br=
 class=3D""> &nbsp;&nbsp;The data sequence mapping specifies a mapping =
from subflow sequence<br class=3D""> &nbsp;&nbsp;space to data sequence =
space. &nbsp;This is expressed in terms of starting<br class=3D""> =
&nbsp;&nbsp;sequence numbers for the subflow and the data level, and a =
length of<br class=3D""> &nbsp;&nbsp;bytes for which this mapping is =
valid. &nbsp;This explicit mapping for a<br class=3D""> =
&nbsp;&nbsp;range of data was chosen rather than per-packet signaling to =
assist<br class=3D""> &nbsp;&nbsp;with compatibility with situations =
where TCP/IP segmentation or<br class=3D""> &nbsp;&nbsp;coalescing is =
undertaken separately from the stack that is generating<br class=3D""> =
&nbsp;&nbsp;the data flow (e.g., through the use of TCP segmentation =
offloading<br class=3D""> &nbsp;&nbsp;on network interface cards, or by =
middleboxes such as performance<br class=3D""> &nbsp;&nbsp;enhancing =
proxies). &nbsp;[...]<br class=3D""><br class=3D"">What happens if the =
resegmentation/coalescing causes the end of the data<br class=3D"">mapping=
 to fall in the middle of a segment but checksums are not enabled?<br =
class=3D"">There's some discussion of this scenario in Section 3.7 and a =
note that<br class=3D"">the checksums would detect this but without =
checksums only a signal at a<br class=3D"">different layer would detect =
tampering. &nbsp;It might be worth discussing<br class=3D"">the =
consequences (corruption in the application stream?) if no such<br =
class=3D"">signal is available.<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>Thanks =
for the thought. This kind of thing is implied in various places but it =
is probably worth spelling out. So I have added the following two =
sentences to this paragraph: "Without checksumming enabled, corrupt data =
may be delivered to the application if a middlebox alters segment =
boundaries, alters content, or does not deliver all segments covered by =
a data sequence mapping. It is therefore RECOMMENDED to =
use&nbsp;checksumming unless it is known the network path contains no =
such devices.&lt;"</div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D"">Section 3.4.1<br class=3D""><br=
 class=3D""> &nbsp;&nbsp;Due to the proliferation of NATs, it is =
reasonably likely that one<br class=3D""> &nbsp;&nbsp;host may attempt =
to advertise private addresses [RFC1918]. &nbsp;It is not<br class=3D""> =
&nbsp;&nbsp;desirable to prohibit this, since there may be cases where =
both hosts<br class=3D""> &nbsp;&nbsp;have additional interfaces on the =
same private network, and a host<br class=3D""> &nbsp;&nbsp;MAY want to =
advertise such addresses. &nbsp;The MP_JOIN handshake to<br class=3D""> =
&nbsp;&nbsp;create a new subflow (Section 3.2) provides mechanisms to =
minimize<br class=3D""> &nbsp;&nbsp;security risks. &nbsp;The MP_JOIN =
message contains a 32-bit token that<br class=3D""> &nbsp;&nbsp;uniquely =
identifies the connection to the receiving host. &nbsp;If the<br =
class=3D""> &nbsp;&nbsp;token is unknown, the host will return with a =
RST. &nbsp;In the unlikely<br class=3D""> &nbsp;&nbsp;event that the =
token is valid at the receiving host, subflow setup<br class=3D""> =
&nbsp;&nbsp;will continue, but the HMAC exchange must occur for =
authentication.<br class=3D""><br class=3D"">nit: I don't think we =
actually specified that this is for the case of<br class=3D"">hosts on =
different private networks using the same private address<br =
class=3D"">range, so "unlikely event" comes as a surprise.<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>I =
don=E2=80=99t quite understand this comment. This text refers to a clash =
of 32-bit tokens (which are hashes and should be fairly random). If for =
the purposes of this exercise they are truly random, the probability of =
such a clash would be 1 in 2147483648 - that seems reasonably unlikely =
to me!</div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><div class=3D"">Section 5<br class=3D""><br class=3D""> =
&nbsp;&nbsp;original connection setup. &nbsp;It also provides =
verification that the<br class=3D""> &nbsp;&nbsp;peer can receive =
traffic at this new address. &nbsp;Replay attacks would<br class=3D""> =
&nbsp;&nbsp;still be possible when only keys are used; therefore, the =
handshakes<br class=3D""> &nbsp;&nbsp;use single-use random numbers =
(nonces) at both ends -- this ensures<br class=3D""> &nbsp;&nbsp;the =
HMAC will never be the same on two handshakes. &nbsp;Guidance on<br =
class=3D""><br class=3D"">I think it's worth saying a bit more about the =
"single-use" property<br class=3D"">and that the party generating the =
nonce can discard it in bounded time,<br class=3D"">since the message =
reacting to the nonce will have aged out.<br class=3D"">On the other =
hand, generally when we use this sort of time-bounded<br =
class=3D"">mechanism with nonces we do still need to take steps to =
ensure<br class=3D"">consistent behavior within the replay window, e.g., =
cache the packet<br class=3D"">to ensure that any duplicates received =
are true retransmits and not<br class=3D"">an attacker having won a race =
with the real recipient.<br class=3D""></div></div></blockquote><div><br =
class=3D""></div>Added a comment about nonce lifetime being in the =
lifetime of the TCP handshake.</div><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><div class=3D""> =
&nbsp;&nbsp;The use of crypto capability bits in the initial connection =
handshake<br class=3D""> &nbsp;&nbsp;to negotiate use of a particular =
algorithm allows the deployment of<br class=3D""> &nbsp;&nbsp;additional =
crypto mechanisms in the future. &nbsp;Note that this<br class=3D""> =
&nbsp;&nbsp;negotiation would be susceptible to a bid-down attack by an =
on-path<br class=3D""> &nbsp;&nbsp;active attacker who could modify the =
crypto capability bits response<br class=3D""> &nbsp;&nbsp;from the =
receiver to use a less secure crypto mechanism. &nbsp;The<br class=3D""> =
&nbsp;&nbsp;security mechanism presented in this document should =
therefore<br class=3D""> &nbsp;&nbsp;protect against all forms of =
flooding and hijacking attacks discussed<br class=3D""> &nbsp;&nbsp;in =
[RFC6181].<br class=3D""><br class=3D"">Nit: the language used here is =
weird, since we "note that" there's an<br class=3D"">additional attack, =
but then conclude ("should therefore") that all<br class=3D"">attacks =
are covered. &nbsp;So perhaps "nonetheless" is a better conjunction,<br =
class=3D"">to show that the remaining attack is not one discussed in =
6181?<br class=3D""></div></div></blockquote><div><br =
class=3D""></div>Thank you.</div><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><div class=3D"">&nbsp; The =
version negotiation specified in Section 3.1, if differing MPTCP<br =
class=3D""> &nbsp;&nbsp;versions shared a common negotiation format, =
would allow an on-path<br class=3D""> &nbsp;&nbsp;attacker to apply a =
theoretical bid-down attack. &nbsp;Since the v1 and v0<br class=3D""> =
&nbsp;&nbsp;protocols have a different handshake, such an attack would =
require<br class=3D""> &nbsp;&nbsp;the client to re-establish the =
connection using v0, and this being<br class=3D""> &nbsp;&nbsp;supported =
by the server. &nbsp;Note that an on-path attacker would have<br =
class=3D""> &nbsp;&nbsp;access to the raw data, negating any other =
TCP-level security<br class=3D""> &nbsp;&nbsp;mechanisms. &nbsp;[...]<br =
class=3D""><br class=3D"">It is perhaps worth distinguishing between an =
on-path attacker that can<br class=3D"">freely modify/add/discard all =
traffic from one that can freely inject<br class=3D"">but not block =
traffic.<br class=3D""></div></div></blockquote><div><br =
class=3D""></div><div>Most attacks against the MPTCP signalling would =
have to be on-path. Injection attacks would require being in-window with =
TCP sequence numbers so would need some on-path knowledge, or a very =
lucky guess. The additional security mechanisms on MPTCP signalling are =
designed to mitigate against these risks.</div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><div class=3D""> =
&nbsp;&nbsp;Whilst this specification defines a "medium" security =
solution,<br class=3D""> &nbsp;&nbsp;meeting the criteria specified at =
the start of this section and the<br class=3D""> &nbsp;&nbsp;threat =
analysis ([RFC6181]), since attacks only ever get worse, it is<br =
class=3D""> &nbsp;&nbsp;likely that a future Standards Track version of =
MPTCP would need to<br class=3D""> &nbsp;&nbsp;be able to support =
stronger security. &nbsp;[...]<br class=3D""><br class=3D"">nit: this =
*is* a standards-track version; just "future version" will<br =
class=3D"">be fine.<br class=3D""></div></div></blockquote><div><br =
class=3D""></div>Thank you.</div><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><div class=3D"">Appendix B.3<br =
class=3D""><br class=3D""> &nbsp;&nbsp;Once this is done, the received =
cookie can be used for TFO, as shown<br class=3D""> &nbsp;&nbsp;in =
Figure Figure 19. &nbsp;[...]<br class=3D""><br class=3D"">nit: "Figure =
Figure" is redundantly redundant. &nbsp;(Also in later<br =
class=3D"">references.)<br class=3D""></div></div></blockquote><div><br =
class=3D""></div>Thank you.<br class=3D""><div><br =
class=3D""></div><blockquote type=3D"cite" class=3D""><div class=3D""><div=
 class=3D"">Appendix C.1.1<br class=3D""><br class=3D""> =
&nbsp;&nbsp;Local.Token (32 bits): &nbsp;This is the token chosen by the =
local host on<br class=3D""> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this MPTCP =
connection. &nbsp;The token must be unique among all<br class=3D""> =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;established MPTCP connections, generated =
from the local key.<br class=3D""><br class=3D"">nit: I think this is =
"and is generated from the local key" -- the<br class=3D"">uniqueness is =
about all MPTCP connections on the host, not just<br class=3D"">those =
using a given key. &nbsp;(This follows naturally from the =
deterministic<br class=3D"">procedure used to generate the token from =
the key, but we should still<br class=3D"">be precise with our =
language.)<br class=3D""></div></div></blockquote></div><br =
class=3D""></div><div class=3D"">And thanks again - much =
appreciated!</div><div class=3D""><br class=3D""></div><div =
class=3D"">Best regards,</div><div class=3D"">Alan</div><div =
class=3D""><br class=3D""></div></body></html>=

--Apple-Mail=_FEECCD2F-69BB-40EE-B1BE-6CD4022FA43A--


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Subject: [multipathtcp] I-D Action: draft-ietf-mptcp-rfc6824bis-18.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Multipath TCP WG of the IETF.

        Title           : TCP Extensions for Multipath Operation with Multiple Addresses
        Authors         : Alan Ford
                          Costin Raiciu
                          Mark Handley
                          Olivier Bonaventure
                          Christoph Paasch
	Filename        : draft-ietf-mptcp-rfc6824bis-18.txt
	Pages           : 82
	Date            : 2019-06-08

Abstract:
   TCP/IP communication is currently restricted to a single path per
   connection, yet multiple paths often exist between peers.  The
   simultaneous use of these multiple paths for a TCP/IP session would
   improve resource usage within the network and, thus, improve user
   experience through higher throughput and improved resilience to
   network failure.

   Multipath TCP provides the ability to simultaneously use multiple
   paths between peers.  This document presents a set of extensions to
   traditional TCP to support multipath operation.  The protocol offers
   the same type of service to applications as TCP (i.e., reliable
   bytestream), and it provides the components necessary to establish
   and use multiple TCP flows across potentially disjoint paths.

   This document specifies v1 of Multipath TCP, obsoleting v0 as
   specified in RFC6824, through clarifications and modifications
   primarily driven by deployment experience.


The IETF datatracker status page for this draft is:
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https://datatracker.ietf.org/doc/html/draft-ietf-mptcp-rfc6824bis-18

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From nobody Sat Jun  8 11:34:33 2019
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Date: Sat, 8 Jun 2019 13:34:09 -0500
From: Benjamin Kaduk <kaduk@mit.edu>
To: Alan Ford <alan.ford@gmail.com>
Cc: draft-ietf-mptcp-rfc6824bis@ietf.org, The IESG <iesg@ietf.org>, multipathtcp@ietf.org, philip.eardley@bt.com, mptcp-chairs@ietf.org
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Subject: Re: [multipathtcp] HMAC output size in draft-ietf-mptcp-rfc6824bis-15 (plus other comments) (with COMMENT)
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On Sat, Jun 08, 2019 at 11:21:46AM +0100, Alan Ford wrote:
> Hi Ben,
> 
> Thank you very much for your detailed comments. My responses are inline, and a -18 rev is about to appear with the changes included.
> 
> > It seems that this may just be a relic of the switch from SHA-1 to SHA-256,
> > since the SHA-1 output is 160 bits and SHA-256's is, well, 256 bits.
> > However, I'm concerned that the document is ambiguous about constructing
> > the HMAC field in MP_JOIN.  It may just be an editorial matter and easily
> > resolved, but I cannot state so with confidence without further input.
> > 
> > In particular, Figure 7 refers to a 160-bit field for the HMAC (which
> > would match with the usage of HMAC-SHA-1 in RFC 6824), but there is
> > no mention of truncating the SHA-256 HMAC in the body text (we do have
> > such discussion for the generation of tokens and IDSNs).  Are
> > implementations truncating from 256 to 160 bits for this message or
> > sending the full 256?  It also seems important to know whether there's
> > enough room in the TCP options space for it all to fit, but I didn't get
> > a chance to try to chase that down.  There's also a note in the body text
> > in Section 3.2 that still talks about "generating a 160-bit / 20-octet
> > HMAC" from SHA-256, which should get updated.
> 
> Great catches, than you. This will remain 160 bits due to option space limitations, but shall be truncated as per RFC2104 (i.e. leftmost bits). I will clarify in the text.

Thanks!

> > I also made some other notes while reading through for the crypto
> > perspective, which would have gone in the Comment section if I had balloted
> > in time:
> > 
> > I appreciate the discussion of what happens when Address ID 0 is
> > removed; that saves me from having to ask about it.
> > 
> > Section 3.1
> > 
> >   prefer not to attempt a v0 connection.  An initiator MAY cache
> >   information for a peer about what version of MPTCP it supports if
> >   any, and use this information for future connection attempts.
> > 
> > I'm a bit surprised to not see guidance here for how long to cache
> > (specifically here and not most other places in the document), since
> > this might affect "baseline load" in some environments.
> 
> That’s kinda the reason why we don’t go into detail! This statement is a MAY, as a suggestion that an implementation may wish to do this. There may be different reasons for an implementation choosing to do this, and certain environmental limitations that mean that it is not appropriate.
> 
> > Section 3.2
> > 
> >   packets) that is used as the "message".  This specification defines
> >   that HMAC as defined in [RFC2104] is used, along with the SHA-256
> >   hash algorithm [RFC6234], thus generating a 160-bit / 20-octet HMAC.
> >   Due to option space limitations, the HMAC included in the SYN/ACK is
> > 
> > [As noted in the Discuss section, SHA-256 HMACs will be 256 bits/32 octets.]
> > 
> >   Although calculating an HMAC requires cryptographic operations, it is
> >   believed that the 32-bit token in the MP_JOIN SYN gives sufficient
> >   protection against blind state exhaustion attacks; therefore, there
> >   is no need to provide mechanisms to allow a responder to operate
> >   statelessly at the MP_JOIN stage.
> > 
> > I would have liked to see some discussion in the security considerations
> > about what probability of success an attacker has at brute-forcing this
> > (as compared to port/sequence-number guessing attacks on plain TCP).
> 
> Whilst I’m not sure it’s directly comparable, we can add something like “This is in comparison to state exhaustion on a TCP port, where the port is typically already known, and SYN cookies can be deployed to aid in stateless operation.” although I am not sure this would add anything. I think saying anything like “this is 65536 times more secure“ would be disingenuous given MPTCP tokens are random but TCP ports are typically well-known.

I'm glad to hear that you don't want to say "this is 65536 times more
secure" :)
But we could still talk about how an attacker would need to guess correctly
N bits of information in order to do Y.  IIUC the N here is larger than for
many attacks on plain TCP, but I don't insist on making a direct comparison
since, as you note, it's not quite directly comparable.

> >   Due to option space limitations, the HMAC included in the SYN/ACK is
> >   truncated to the leftmost 64 bits, but this is acceptable since
> >   random numbers are used; thus, an attacker only has one chance to
> >   guess the HMAC correctly (if the HMAC is incorrect, the TCP
> >   connection is closed, so a new MP_JOIN negotiation with a new random
> >   number is required).
> > 
> > nit: I think this might be more clear if we clarified that this is "only
> > one chance to guess the HMAC that matches the nonce previously sent by
> > the peer" -- each party commits to a nonce before the HMAC is generated,
> > and requires the received HMAC to match that nonce.
> 
> Thank you!
> 
> >   The key for the HMAC algorithm, in the case of the message
> >   transmitted by Host A, will be Key-A followed by Key-B, and in the
> >   case of Host B, Key-B followed by Key-A.  These are the keys that
> >   were exchanged in the original MP_CAPABLE handshake.  The "message"
> > 
> > This is a little dicey in theory in terms of putting underlying
> > structure in the HMAC key and the risk of related key attacks, but for
> > SHA-256 I don't know of any specific hazards.  Key
> > combination/derivation methods such as HKDF would alleviate this (mostly
> > theoretical) risk, but given that the goal is "not worse than TCP" I
> > don't see a need to insist upon them here.
> 
> Thanks for the pointer here. I think this would be inappropriate to introduce at this stage given lack of real-world experience and especially since the impact on “friendly” middleboxes may cause issues, and as you say is not required to meet our security goals. But it’s a great pointer for future evolutions of this spec.

Yeah, it seems too late for changing it to be reasonable for v1, given the
risk/reward balance.  Perhaps in v2...

> >   If the HMACs are verified as correct, then both hosts have
> >   authenticated each other as being the same peers as existed at the
> >   start of the connection, and they have agreed of which connection
> >   this subflow will become a part.
> > 
> > nit: there's not much notion of "identity" here, so I'd suggest using a
> > verb like "verified" or "assured" rather than
> > "authenticated", e.g., "both hosts have provided assurance to each other
> > that they are the same peers as existed at the start of the connection”.
> 
> Thank you.
> 
> > Section 3.3
> > 
> >   The 'F' flag indicates "Data FIN".  If present, this means that this
> >   mapping covers the final data from the sender.  This is the
> >   connection-level equivalent to the FIN flag in single-path TCP.  A
> >   connection is not closed unless there has been a Data FIN exchange,
> >   or an implementation-specific, connection-level timeout.  [...]
> > 
> > Is this really appropriate to lave implementation-specific, since it
> > could result in peers disagreeing about whether a connection is closed?
> 
> These kinds of issues happen all the time in TCP today as different implementations or network conditions may lead to ends timing out at different points. This will be discovered by the peer through a TCP RST. The text existed primarily to cover MPTCP scenarios equivalent to those found in TCP today. However, this text pre-dates the MP_FASTCLOSE method, which would be preferred in this environment, and so I’ve clarified this is a send timeout and also pointed to MP_FASTCLOSE as another option.
> 
> >                       The presence of the checksum can be inferred from
> >   the length of the option.  If a checksum is present, but its use had
> >   not been negotiated in the MP_CAPABLE handshake, the checksum field
> >   MUST be ignored.  [...]
> > 
> > Why is ignoring better than RST-ing?  We abort on other cases of
> > tampering, IIUC.
> 
> Hmm, I guess you could call this tampering (adding an unexpected field)! I think the rationale here was if an implementation for some reason misunderstood the negotiation, or was lazy and just checksummed everything, then a receiver should just not care. But for consistency it seems right to close the connection, so we can change that.

I guess I didn't consider the lazy implementation checksumming everything,
but if you think this is a good change, I'm happy to see it.

> > Section 3.3.1
> > 
> >   The data sequence mapping specifies a mapping from subflow sequence
> >   space to data sequence space.  This is expressed in terms of starting
> >   sequence numbers for the subflow and the data level, and a length of
> >   bytes for which this mapping is valid.  This explicit mapping for a
> >   range of data was chosen rather than per-packet signaling to assist
> >   with compatibility with situations where TCP/IP segmentation or
> >   coalescing is undertaken separately from the stack that is generating
> >   the data flow (e.g., through the use of TCP segmentation offloading
> >   on network interface cards, or by middleboxes such as performance
> >   enhancing proxies).  [...]
> > 
> > What happens if the resegmentation/coalescing causes the end of the data
> > mapping to fall in the middle of a segment but checksums are not enabled?
> > There's some discussion of this scenario in Section 3.7 and a note that
> > the checksums would detect this but without checksums only a signal at a
> > different layer would detect tampering.  It might be worth discussing
> > the consequences (corruption in the application stream?) if no such
> > signal is available.
> 
> Thanks for the thought. This kind of thing is implied in various places but it is probably worth spelling out. So I have added the following two sentences to this paragraph: "Without checksumming enabled, corrupt data may be delivered to the application if a middlebox alters segment boundaries, alters content, or does not deliver all segments covered by a data sequence mapping. It is therefore RECOMMENDED to use checksumming unless it is known the network path contains no such devices.<"

Thank you!

> > Section 3.4.1
> > 
> >   Due to the proliferation of NATs, it is reasonably likely that one
> >   host may attempt to advertise private addresses [RFC1918].  It is not
> >   desirable to prohibit this, since there may be cases where both hosts
> >   have additional interfaces on the same private network, and a host
> >   MAY want to advertise such addresses.  The MP_JOIN handshake to
> >   create a new subflow (Section 3.2) provides mechanisms to minimize
> >   security risks.  The MP_JOIN message contains a 32-bit token that
> >   uniquely identifies the connection to the receiving host.  If the
> >   token is unknown, the host will return with a RST.  In the unlikely
> >   event that the token is valid at the receiving host, subflow setup
> >   will continue, but the HMAC exchange must occur for authentication.
> > 
> > nit: I don't think we actually specified that this is for the case of
> > hosts on different private networks using the same private address
> > range, so "unlikely event" comes as a surprise.
> 
> I don’t quite understand this comment. This text refers to a clash of 32-bit tokens (which are hashes and should be fairly random). If for the purposes of this exercise they are truly random, the probability of such a clash would be 1 in 2147483648 - that seems reasonably unlikely to me!

Sorry for being unclear -- this is just a quibble with the wording/grammar.
Perhaps "In the unlikely event that the hosts are on different private
networks but the token is valid at the receiving host" would be more clear
as to the meaning.  That is, the text itself doesn't say "this works fine
if both hosts are on the same network, but breaks in the following way if
they are different private networks using the same address range".

> > Section 5
> > 
> >   original connection setup.  It also provides verification that the
> >   peer can receive traffic at this new address.  Replay attacks would
> >   still be possible when only keys are used; therefore, the handshakes
> >   use single-use random numbers (nonces) at both ends -- this ensures
> >   the HMAC will never be the same on two handshakes.  Guidance on
> > 
> > I think it's worth saying a bit more about the "single-use" property
> > and that the party generating the nonce can discard it in bounded time,
> > since the message reacting to the nonce will have aged out.
> > On the other hand, generally when we use this sort of time-bounded
> > mechanism with nonces we do still need to take steps to ensure
> > consistent behavior within the replay window, e.g., cache the packet
> > to ensure that any duplicates received are true retransmits and not
> > an attacker having won a race with the real recipient.
> 
> Added a comment about nonce lifetime being in the lifetime of the TCP handshake.
> 
> >   The use of crypto capability bits in the initial connection handshake
> >   to negotiate use of a particular algorithm allows the deployment of
> >   additional crypto mechanisms in the future.  Note that this
> >   negotiation would be susceptible to a bid-down attack by an on-path
> >   active attacker who could modify the crypto capability bits response
> >   from the receiver to use a less secure crypto mechanism.  The
> >   security mechanism presented in this document should therefore
> >   protect against all forms of flooding and hijacking attacks discussed
> >   in [RFC6181].
> > 
> > Nit: the language used here is weird, since we "note that" there's an
> > additional attack, but then conclude ("should therefore") that all
> > attacks are covered.  So perhaps "nonetheless" is a better conjunction,
> > to show that the remaining attack is not one discussed in 6181?
> 
> Thank you.
> 
> >   The version negotiation specified in Section 3.1, if differing MPTCP
> >   versions shared a common negotiation format, would allow an on-path
> >   attacker to apply a theoretical bid-down attack.  Since the v1 and v0
> >   protocols have a different handshake, such an attack would require
> >   the client to re-establish the connection using v0, and this being
> >   supported by the server.  Note that an on-path attacker would have
> >   access to the raw data, negating any other TCP-level security
> >   mechanisms.  [...]
> > 
> > It is perhaps worth distinguishing between an on-path attacker that can
> > freely modify/add/discard all traffic from one that can freely inject
> > but not block traffic.
> 
> Most attacks against the MPTCP signalling would have to be on-path. Injection attacks would require being in-window with TCP sequence numbers so would need some on-path knowledge, or a very lucky guess. The additional security mechanisms on MPTCP signalling are designed to mitigate against these risks.

I think we're in agreement here, in that the attacker basically always has
to be on-path and can thus read the "real" traffic.  I think there are
scenarios where an attacker can read the on-path traffic but not rewrite
all traffic, so if the attacker injects new data, both the attacker's data
and the legitimate data arrive, which the receiver could detect as bogus
behavior and close the connection.  (The receiver is not obligated to do
so, though, IIUC.)  So there isn't necessarily more specifically to say
here, though I didn't do a full sweep of the document.

Thanks again,

Ben

> >   Whilst this specification defines a "medium" security solution,
> >   meeting the criteria specified at the start of this section and the
> >   threat analysis ([RFC6181]), since attacks only ever get worse, it is
> >   likely that a future Standards Track version of MPTCP would need to
> >   be able to support stronger security.  [...]
> > 
> > nit: this *is* a standards-track version; just "future version" will
> > be fine.
> 
> Thank you.
> 
> > Appendix B.3
> > 
> >   Once this is done, the received cookie can be used for TFO, as shown
> >   in Figure Figure 19.  [...]
> > 
> > nit: "Figure Figure" is redundantly redundant.  (Also in later
> > references.)
> 
> Thank you.
> 
> > Appendix C.1.1
> > 
> >   Local.Token (32 bits):  This is the token chosen by the local host on
> >      this MPTCP connection.  The token must be unique among all
> >      established MPTCP connections, generated from the local key.
> > 
> > nit: I think this is "and is generated from the local key" -- the
> > uniqueness is about all MPTCP connections on the host, not just
> > those using a given key.  (This follows naturally from the deterministic
> > procedure used to generate the token from the key, but we should still
> > be precise with our language.)
> 
> And thanks again - much appreciated!
> 
> Best regards,
> Alan
> 


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Subject: [multipathtcp] Multipath TCP for Linux wins SIGCOMM Networking Systems Award
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Hi,

most of you probably have heard this, but the 2019 SIGCOMM Networking =
Systems Award just went to the Multipath TCP implementation in the Linux =
kernel that some WG participants are heavily involved with: =
http://www.sigcomm.org/content/sigcomm-networking-systems-award

Congrats!

Lars

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Subject: Re: [multipathtcp] Multipath TCP for Linux wins SIGCOMM Networking Systems Award
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Yes, Congratulations for great work!!
--
Yoshi

On Sun, Jun 9, 2019 at 11:14 PM Lars Eggert <lars@eggert.org> wrote:

> Hi,
>
> most of you probably have heard this, but the 2019 SIGCOMM Networking
> Systems Award just went to the Multipath TCP implementation in the Linux
> kernel that some WG participants are heavily involved with:
> http://www.sigcomm.org/content/sigcomm-networking-systems-award
>
> Congrats!
>
> Lars
> _______________________________________________
> multipathtcp mailing list
> multipathtcp@ietf.org
> https://www.ietf.org/mailman/listinfo/multipathtcp
>

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<div dir=3D"ltr"><div>Yes, Congratulations for great work!!</div><div>--</d=
iv><div>Yoshi</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D=
"gmail_attr">On Sun, Jun 9, 2019 at 11:14 PM Lars Eggert &lt;<a href=3D"mai=
lto:lars@eggert.org">lars@eggert.org</a>&gt; wrote:<br></div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid=
 rgb(204,204,204);padding-left:1ex">Hi,<br>
<br>
most of you probably have heard this, but the 2019 SIGCOMM Networking Syste=
ms Award just went to the Multipath TCP implementation in the Linux kernel =
that some WG participants are heavily involved with: <a href=3D"http://www.=
sigcomm.org/content/sigcomm-networking-systems-award" rel=3D"noreferrer" ta=
rget=3D"_blank">http://www.sigcomm.org/content/sigcomm-networking-systems-a=
ward</a><br>
<br>
Congrats!<br>
<br>
Lars<br>
_______________________________________________<br>
multipathtcp mailing list<br>
<a href=3D"mailto:multipathtcp@ietf.org" target=3D"_blank">multipathtcp@iet=
f.org</a><br>
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From nobody Mon Jun 17 05:42:22 2019
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Thread-Topic: [multipathtcp] Multipath TCP for Linux wins SIGCOMM Networking Systems Award
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Subject: Re: [multipathtcp] Multipath TCP for Linux wins SIGCOMM Networking Systems Award
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Thread-Topic: [multipathtcp] Regarding rate control at a subflow level
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Archived-At: <https://mailarchive.ietf.org/arch/msg/multipathtcp/8UulzNCjyS3QP4z1pwO3X1h43YM>
Subject: Re: [multipathtcp] Regarding rate control at a subflow level
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Thread-Topic: RE:(4) [multipathtcp] Regarding rate control at a subflow level
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Archived-At: <https://mailarchive.ietf.org/arch/msg/multipathtcp/lasxS4OQaAHccPa0uWvW1XBcX7g>
Subject: Re: [multipathtcp] (4)  Regarding rate control at a subflow level
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Thread-Topic: [multipathtcp] Regarding rate control at a subflow level
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Subject: Re: [multipathtcp] Regarding rate control at a subflow level
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Thread-Topic: [multipathtcp] Regarding rate control at a subflow level
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Subject: Re: [multipathtcp] Regarding rate control at a subflow level
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From: Nagesh shamnur <nagesh.shamnur@huawei.com>
To: "philip.eardley@bt.com" <philip.eardley@bt.com>, "cpaasch=40apple.com@dmarc.ietf.org" <cpaasch=40apple.com@dmarc.ietf.org>, "olivier.bonaventure@uclouvain.be" <olivier.bonaventure@uclouvain.be>
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Thread-Topic: [multipathtcp] Regarding rate control at a subflow level
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Subject: Re: [multipathtcp] Regarding rate control at a subflow level
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Thread-Topic: [multipathtcp] Regarding rate control at a subflow level
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Subject: Re: [multipathtcp] Regarding rate control at a subflow level
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Thread-Topic: [multipathtcp] Regarding rate control at a subflow level
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Subject: Re: [multipathtcp] Regarding rate control at a subflow level
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From: Nagesh shamnur <nagesh.shamnur@huawei.com>
To: "philip.eardley@bt.com" <philip.eardley@bt.com>, "cpaasch=40apple.com@dmarc.ietf.org" <cpaasch=40apple.com@dmarc.ietf.org>, "olivier.bonaventure@uclouvain.be" <olivier.bonaventure@uclouvain.be>
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Thread-Topic: [multipathtcp] Regarding rate control at a subflow level
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Subject: Re: [multipathtcp] Regarding rate control at a subflow level
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From: Olivier Bonaventure <olivier.bonaventure@uclouvain.be>
To: "philip.eardley@bt.com" <philip.eardley@bt.com>, "cpaasch=40apple.com@dmarc.ietf.org" <cpaasch=40apple.com@dmarc.ietf.org>
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Thread-Topic: [multipathtcp] Regarding rate control at a subflow level
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Date: Fri, 21 Jun 2019 08:13:35 +0000
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Subject: Re: [multipathtcp] Regarding rate control at a subflow level
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Subject: Re: [multipathtcp] (2)  Regarding rate control at a subflow level
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From: Yoshifumi Nishida <nsd.ietf@gmail.com>
Date: Sun, 23 Jun 2019 22:49:50 -0700
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Subject: [multipathtcp] primary/secondary path concept in mptcp?
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Hi,
While I'm reading the recent threads in mptcp WG ML, I start wondering
there might be a need for primary/secondary path concept in mptcp path
managements, which is similar to the one in SCTP.

The mptcp spec already allows us to set backup flag to the path. But, in
this case, failover will happen only when the regular path becomes
unavailable. I think this will mean it can take longer time unless the
regular path can correctly sends RST.

The primary/secondary path idea is more light-weight approach than the
backup mode. When packets has been lost on the primary, it tries to utilize
the secondary path while checking the status of the primary (e.g. by
sending keep alives). Once the primary has been recovered, it starts using
the primary again.

A potential use case for this approach would be wifi and LTE combination.
While wifi link has intermittent connection failure (e.g due to handover or
minor connection problems), it uses LTE and after the wifi link has been
recovered, it starts using it again.

Some folks may say a well sophisticated path scheduler can handle this kind
of situations, but I'm not very sure yet because it may need complex
controls to be effective.

Thanks,
--
Yoshi

--0000000000001a3799058c0b620f
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi,<div>While I&#39;m reading the recent threads in mptcp =
WG ML, I start wondering there might be a need for primary/secondary path c=
oncept in mptcp path managements, which is similar to the one in SCTP.</div=
><div><br></div><div>The mptcp spec already allows us to set backup flag to=
 the path. But, in this case, failover will happen only when the regular pa=
th becomes unavailable. I think this will mean it can take longer time unle=
ss the regular path can correctly sends RST.</div><div><br></div><div>The p=
rimary/secondary path idea is more light-weight approach than the backup mo=
de. When packets has been lost on the primary, it tries to utilize the seco=
ndary path while checking the status of the primary (e.g. by sending keep a=
lives). Once the primary has been recovered, it starts using the primary ag=
ain.</div><div><br></div><div>A potential use case for this approach would =
be wifi and LTE combination. While wifi link has intermittent connection fa=
ilure (e.g due to handover or minor connection problems), it uses LTE and a=
fter the wifi link has been recovered, it starts using it again.</div><div>=
<br></div><div>Some folks may say a well sophisticated path scheduler can h=
andle this kind of situations, but I&#39;m not very sure yet because it may=
 need complex controls to be effective.=C2=A0</div><div><br></div><div>Than=
ks,</div><div>--</div><div>Yoshi=C2=A0</div></div>

--0000000000001a3799058c0b620f--


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From: Yoshifumi Nishida <nsd.ietf@gmail.com>
Date: Sun, 23 Jun 2019 22:54:12 -0700
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Subject: [multipathtcp] Agenda for Montreal meeting
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Hello,
According to the current preliminary agenda (
https://datatracker.ietf.org/meeting/105/agenda.html
 ),
We will have a 2-hour meeting slot on July 22 Monday morning (10:00-12:00).
(Please note this might be changed as it's still preliminary)

If you're planning to present something, please provide us the following
info.

   1: presenter's name
   2: title
   3: length of the presentation

Thanks,
--
Yoshi & Phil

--000000000000a973d3058c0b71ca
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<div dir=3D"ltr"><div dir=3D"ltr">Hello,<br>According to the current prelim=
inary agenda ( <a href=3D"https://datatracker.ietf.org/meeting/105/agenda.h=
tml">https://datatracker.ietf.org/meeting/105/agenda.html</a><br>=C2=A0),<b=
r>We will have a 2-hour meeting slot on July 22 Monday morning (10:00-12:00=
). <br>(Please note this might be changed as it&#39;s still preliminary)<br=
><br>If you&#39;re planning to present something, please provide us the fol=
lowing info. <br><br>=C2=A0 =C2=A01: presenter&#39;s name<br>=C2=A0 =C2=A02=
: title<br>=C2=A0 =C2=A03: length of the presentation<br><br>Thanks,<br>--<=
br>Yoshi &amp; Phil<br></div></div>

--000000000000a973d3058c0b71ca--


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Archived-At: <https://mailarchive.ietf.org/arch/msg/multipathtcp/0Iex3Squ-S7ZITp0x-lDnvWcPIE>
Subject: Re: [multipathtcp] Regarding rate control at a subflow level
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From: Nagesh shamnur <nagesh.shamnur@huawei.com>
To: "philip.eardley@bt.com" <philip.eardley@bt.com>, "cpaasch=40apple.com@dmarc.ietf.org" <cpaasch=40apple.com@dmarc.ietf.org>, "olivier.bonaventure@uclouvain.be" <olivier.bonaventure@uclouvain.be>
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Thread-Topic: [multipathtcp] Regarding rate control at a subflow level
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Subject: Re: [multipathtcp] Regarding rate control at a subflow level
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From nobody Fri Jun 28 16:03:09 2019
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Subject: [multipathtcp] mptcp - Requested session has been scheduled for IETF 105
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Dear Philip Eardley,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 


    mptcp Session 1 (2:00 requested)
    Monday, 22 July 2019, Afternoon Session II 1550-1750
    Room Name: Place du Canada size: 300
    ---------------------------------------------


iCalendar: https://datatracker.ietf.org/meeting/105/sessions/mptcp.ics

Request Information:


---------------------------------------------------------
Working Group Name: Multipath TCP
Area Name: Transport Area
Session Requester: Philip Eardley

Number of Sessions: 1
Length of Session(s):  2 Hours
Number of Attendees: 80
Conflicts to Avoid: 
 First Priority: tcpm tsvarea tsvwg quic
 Second Priority: panrg iccrg irtfopen intarea ippm taps dmm
 Third Priority: maprg icnrg dinrg manet coinrg


People who must be present:
  Yoshifumi Nishida
  Philip Eardley
  Mirja Kuehlewind

Resources Requested:

Special Requests:
  3rd priority: loops bof
---------------------------------------------------------

