From nemo-admin@nal.motlabs.com  Wed Oct 16 07:41:58 2002
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From nemo-admin@nal.motlabs.com  Wed Oct 16 08:05:47 2002
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test ignore houh hah



From nemo-admin@nal.motlabs.com  Wed Oct 16 08:32:49 2002
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From: Thierry Ernst <ernst@sfc.wide.ad.jp>
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Subject: [nemo] Re: Nemo WG approved
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Hi all,

Before anything else, let me also thank every one who helped setting
up the NEMO working group, and particularly Hesham Soliman. I enjoyed
working with him on the charter and preparing the BOF very much; the
team work went very smoothly. I thus hope Hesham will put some cycles
before we enter the RO discussion, because, as been involved in the
creation of the WG, his experience is invaluable for all of
us. Finally, welcome to TJ Kniveton who will soon learn all the
wonderful joys of co-chairing NEMO :-). I hope it will be easier now
that we agreed on the charter and become a WG.

Now, let's meet our milestones !

Thierry.

> From: "Hesham Soliman (EAB)" <hesham.soliman@era.ericsson.se>
> Subject: RE: Nemo WG approved
> Date: Wed, 16 Oct 2002 09:23:34 +0200
>
> Folks, 
> 
> Thanks Erik for the good news and your instrumental help 
> this year.
> 
> I'd like to thank you all for your infinite patience,
> support and hard work to get this WG approved. Special
> thanks to Thierry for receiving my regular early morning
> phone calls! 
> 
> I've enjoyed the discussions we had and I'll look forward 
> to working with you all very soon. Perhaps next spring 
> when I have a few more cycles and when the RO discussions
> start getting heated!
> 
> See you in Atlanta, 
> Hesham
> 
>   > -----Original Message-----
>   > From: Erik Nordmark [mailto:Erik.Nordmark@sun.com]
>   > Sent: Wednesday, October 16, 2002 7:31 AM
>   > To: monet@nal.motlabs.com
>   > Cc: erik.nordmark@sun.com; hesham.soliman@era.ericsson.se;
>   > tj@kniveton.com; ernst@sfc.wide.ad.jp
>   > Subject: Nemo WG approved
>   > 
>   > 
>   > 
>   > The IESG has approved the Nemo WG charter and an official 
>   > announcement
>   > will appear in the next few days.
>   > 
>   > As part of moving from the BoF stage to the WG stage the 
>   > ADs decided to
>   > change the co-chair for the group.
>   > 
>   > T.J Kniveton has offered to co-chair together with Thierry. As part
>   > of this I'd like to thank Hesham very much for the work he 
>   > put into making the
>   > BoF take place and working on refining the problem 
>   > statement and charter, etc.
>   > I'm sure Hesham will continue to be active in the Nemo WG 
>   > (at least that is
>   > what he told me).
>   > 
>   > As part of moving from BoF to WG the intent is also to use 
>   > the mailing
>   > list called nemo@nal.motlabs.com instead of "monet", but 
>   > the chairs will 
>   > figure out if there is any adminstrative issues to take 
>   > care of in that space.
>   > 
>   > So once again thanks to Hesham and welcome to Thierry and TJ.
>   > 
>   >   Erik
>   > 
> 


From nemo-admin@nal.motlabs.com  Wed Oct 16 08:43:43 2002
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Subject: [nemo] From now, please post to NEMO, not MONET
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Hi all,

As part of the process of creating the working group, we have moved
the former MONET mailing and web page to NEMO.

You don't need to subscribe to the new list, all people on the list
have been automatically unsubscribed from MONET and subscribed to
NEMO.

From now, please only post to nemo@nal.motlabs.com.  If you still send
to monet by mistake, you will receive a message requesting you to post
to nemo.

You will find the archives at
http://www.nal.motlabs.com/mailman/listinfo/nemo ; both the NEMO
archives starting from today, and the MONET archives until today. The
MONET archives may not be pleasant to read, though.

We will soon have our official web page on http://www.ietf.org, and
our additional web page for NEMO is
http://www.nal.motlabs.com/nemo/. Please update your bookmarks.


If you have any enquiry, please feel free to ask.


And, shall I say, "Short life to the NEMO WG" :-)


Thierry



From nemo-admin@nal.motlabs.com  Wed Oct 16 09:12:07 2002
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Subject: [nemo] More about NEMO: mind your filters
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One more thing is that you should also change filters from [monet] to
[nemo].

And, by the way, I forgot to thank Alexandru Petrescu who has overcome
all the troubles of translating monet to nemo. Good job !

Thierry




From nemo-admin@nal.motlabs.com  Wed Oct 16 11:19:08 2002
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Subject: [nemo] Re: [monet] Nemo WG approved
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Hello Thierry!

This is good news for me and other NEMO researchers.
I am very interested in the RO issues in NEMO, and 
have the plan of submitting a RO-related draft in this WG.

However, I heard from your presentation at our company that 
we should work on the basic support of NEMO by the the 
spring in 2003. I want to know the clear division between 
the basic support and the extended support. Of course, I already 
read the new charter which decribes the detailed basic and 
extended support. However, if you would tell the highlight 
or crux about the two supports in this mailing list, I could appreciate you. 
Also, please let me know some open issues about the basic support.
I think that the job on the above request will be good guidance 
for many NEMO researchers.

Cheers,
Youn-Hee Han.
Samsung AIT





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Subject: [nemo] RE: [monet] Nemo WG approved
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Date: Thu, 17 Oct 2002 16:27:03 +0100
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We exist :)
 
Next is how can we get into the agenda? There are drafts that could be
discussed...

Pascal

> -----Original Message-----
> From: Erik Nordmark [mailto:Erik.Nordmark@sun.com]
> Sent: mercredi 16 octobre 2002 07:31
> To: monet@nal.motlabs.com
> Cc: erik.nordmark@sun.com; hesham.soliman@era.ericsson.se;
tj@kniveton.com;
> ernst@sfc.wide.ad.jp
> Subject: [monet] Nemo WG approved
> 
> 
> The IESG has approved the Nemo WG charter and an official announcement
> will appear in the next few days.
> 
> As part of moving from the BoF stage to the WG stage the ADs decided
to
> change the co-chair for the group.
> 
> T.J Kniveton has offered to co-chair together with Thierry. As part
> of this I'd like to thank Hesham very much for the work he put into
making the
> BoF take place and working on refining the problem statement and
charter, etc.
> I'm sure Hesham will continue to be active in the Nemo WG (at least
that is
> what he told me).
> 
> As part of moving from BoF to WG the intent is also to use the mailing
> list called nemo@nal.motlabs.com instead of "monet", but the chairs
will
> figure out if there is any adminstrative issues to take care of in
that space.
> 
> So once again thanks to Hesham and welcome to Thierry and TJ.
> 
>   Erik



From nemo-admin@nal.motlabs.com  Thu Oct 17 22:13:08 2002
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Hi all,

First let me congratulate the forming of the NEMO WG.  Thanks to the
effort of Hesham, Thierry and many others.

I would like to draw the attention of the group to the draft I have
submitted, the URL is:
http://www.ietf.org/internet-drafts/draft-ng-nemo-aaa-use-00.txt

This draft covers some usage scenario of large-scale commercial
deployment of NEMO, and attempt to raise discussion on AAA issues
(specifically, we only focus on access control for the moment) unique to
NEMO.

Our intention is to use this draft as a starting point to invite
discussion on AAA issues for NEMO.  I think it is good to discuss this
while the work items for NEMO is being formed.

All comments/criticisms are welcomed.

Regards,
Chan-Wah Ng.


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Dear Youn-Hee Han,

> I want to know the clear division between 
> the basic support and the extended support. Of course, I already 
> read the new charter which decribes the detailed basic and 
> extended support. However, if you would tell the highlight 
> or crux about the two supports in this mailing list, I could appreciate you. 

There were a few threads about this on the mailing list before IETF
Yokohama to which you can refer to. Basically, it is assumed that
optimizing routing is a complex task to conduct but we would like to
have a quick solution for applications that don't bother with these
routing issues. So, basic support will offer what is needed to
maintain ongoing sessions while extended support will be offered later
as an optimization.

> Also, please let me know some open issues about the basic support.
> I think that the job on the above request will be good guidance 
> for many NEMO researchers.

Basically, issues in basic support is one of the topics that we will
have to discuss on this list.


Thierry.





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Hi all,

Are we holding a session at the next IETF meeting?
If we are, has the agenda been finalized?


Best Regards,
Takeshi
-----------------------------------------------
 Takeshi TANAKA
 Wireless Solution Laboratories, Panasonic
 e-mail: Takeshi.Tanaka@yrp.mci.mei.co.jp
 phone: +81-468-40-5494 / fax: +81-468-40-5183
-----------------------------------------------



From nemo-admin@nal.motlabs.com  Mon Oct 21 06:17:17 2002
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Hi all,

Are we holding a session at the next IETF meeting?
If we are, has the agenda been finalized?


Best Regards,
Takeshi
-----------------------------------------------
 Takeshi TANAKA
 Wireless Solution Laboratories, Panasonic
 e-mail: Takeshi.Tanaka@yrp.mci.mei.co.jp
 phone: +81-468-40-5494 / fax: +81-468-40-5183
-----------------------------------------------



From nemo-admin@nal.motlabs.com  Mon Oct 21 06:35:03 2002
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> Are we holding a session at the next IETF meeting?
> If we are, has the agenda been finalized?

We will definitely have a NEMO meeting at Atlanta, so yes you can book
your flights. 

About the agenda, we will post a mail this week on the NEMO mailing
list.

Thierry



From nemo-admin@nal.motlabs.com  Mon Oct 21 14:00:09 2002
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Takeshi TANAKA wrote:
> Are we holding a session at the next IETF meeting?
> If we are, has the agenda been finalized?


Hi folks,

We are discussing the agenda proposal this week, then a meeting request will be
sent to the IETF. After we receive confirmation, I will post it to the list.

Thanks,
-TJ


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From: "T.J. Kniveton" <tj@kniveton.com>
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Subject: [nemo] NEMO Solution Requirements Process
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This week, we have been discussing the issue of how to begin work on 
producing the documents which the NEMO wg has promised to deliver. This 
involved process begins with defining the requirements of Phase I of our 
work: the non-optimized reachability support using reverse tunneling. 
Our ADs have been helpful in suggesting how to make good forward 
progress on this, and we would like to share the process that was 
proposed, and what we feel is necessary to build momentum at this point.

Firstly, one of our goals is to start discussing the various facets of 
the requirements as they have been proposed right away. This way, we can 
identify the areas of agreement straight off, and discuss the 
controversial topics one by one.

In order to take all viewpoints into consideration, we would like to 
have as a starting point all requirements documents that were previously 
discussed in the BOF sessions. Since these are individual drafts which 
have expired, we ask those authors to resubmit them before the draft 
cutoff. If others have already written text on ideas for requirements that
are ready for discussion, they can be put into draft form as well,
minding the fast approaching cut-off for new drafts.

Once we have these drafts, it will be helpful if a reviewer can go through
them to see the common points of agreement, the deltas between the 
documents; i.e. points of difference, and unique ideas which may only be 
found in one or two drafts. After having this information, we can 
discuss these points on the list and reach a consensus in an organized
way.

For the IETF, we have requested a 2 hour slot, when we can have some 
further analysis of open issues in the Requirements, and other topics as 
will be outlined in the agenda.

And finally, we were wondering whether anyone has begun to think about 
the threats analysis document and has come up with any material on that 
topic.

Thanks,

TJ & Thierry


From nemo-admin@nal.motlabs.com  Fri Oct 25 08:21:40 2002
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To: "T.J. Kniveton"<tj@kniveton.com>
Cc: <nemo@nal.motlabs.com>, <ernst@sfc.wide.ad.jp>, <narten@us.ibm.com>,
        <erik.nordmark@sun.com>
Subject: Re: [nemo] NEMO Solution Requirements Process
References: <3DB840E1.5D9B1AEC@kniveton.com>
From: Alexandru Petrescu<petrescu@crm.mot.com>
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Date: 25 Oct 2002 14:13:19 +0200

"T.J. Kniveton" <tj@kniveton.com> writes:
> This week, we have been discussing the issue of how to begin work on 
> producing the documents which the NEMO wg has promised to deliver. This 
> involved process begins with defining the requirements of Phase I of our 
> work: the non-optimized reachability support using reverse
> tunneling. 

Yes, we should concentrate more on requirements that are related to
the MRHA tunnel kind of solution.  For example, requirements that are
related to RO, or requirements that are related to it being
transparent to TCP are no longer relevant now.  We now know that this
is transparent to TCP and that RO is for later.

IMHO, what we need to require is things like how is the link-local
address supported in Mobile IPv6, because MR is a router and normally
uses its ll address for exchanging routing info.  Requirements like
that.

> And finally, we were wondering whether anyone has begun to think about 
> the threats analysis document and has come up with any material on that 
> topic.

Yes, we begun thinking about security threat analysis, but not about
the document :-)

Threat analysis is much simplified when the MRHA-like Mobile IPv6
solution is clearer.  There are still many open questions about that
solution.

As with the MRHA requirements, the security threat analysis should
address only the MRHA-like solution, not the RO.  It should find out
whether using MR instead of MH in Mobile IPv6 introduces new threats
and what kinds of threats.  For example, in the MH case, a possible
threat is that MH1 impersonates MH2, where MH1 and MH2 have the same
HA.  This is countered by securing the MHHA tunnel.

In the MR case, when MR acts as an MH too, and if that MH develops an
SA with a CN (via return routability tests), then it must not be
possible for the LFN's to take advantage of that SA in order to
communicate with the CN.

When the MR is at home, and MR maintains secure classical secure
routing (like authenticated RIP or authenticated OSPF) with its
routers at home, then that classical secure routing should be
maintained when the MR is not at home.

Things like that.  But I bet there are many more.

Alex



From nemo-admin@nal.motlabs.com  Fri Oct 25 12:16:28 2002
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Thread-Topic: Route Optimization in Nemo
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
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Subject: [nemo] Route Optimization in Nemo
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Hi

Some time ago, I published
http://www.ietf.org/internet-drafts/draft-thubert-nemo-ro-taxonomy-00.tx
t 
Which is an attempt to start a discussion on Route Optimization in the
Nemo context.

I wish to debate issues on this topic if anybody is interested. At the
moment, the goal is to refine our understanding of the problem space.
 
Pascal Thubert
 


From nemo-admin@nal.motlabs.com  Sat Oct 26 19:29:41 2002
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Subject: [nemo] SOLICITING FOR YOUR ASSISTANCE.
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FROM: MRS. LOUISA EJERCITOR ESTRADA
Email: estradal@rediffmail.com
	   estradalo@rediffmail.com 
E-fax: +1 775-458-2140


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Thanking you for your anticipated co-operation.

Best regards,
MRS. LOUISA EJERCITOR ESTRADA


From nemo-admin@nal.motlabs.com  Sun Oct 27 23:16:53 2002
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From: Thierry Ernst <ernst@sfc.wide.ad.jp>
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Subject: [nemo] Terminology Update
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Hi all,

I've updated the terminology draft:
http://www.ietf.org/internet-drafts/draft-ernst-nemo-terminology-00.txt

Please don't refer to draft-ernst-monet-terminology ... anymore.

If I receive useful comments by Friday, I can update it to a version
-01 before the meeting.


Cheers,
Thierry





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From: Takeshi TANAKA <Takeshi.Tanaka@yrp.mci.mei.co.jp>
To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>,
        IETF NEMO <nemo@nal.motlabs.com>
Subject: Re: [nemo] Route Optimization in Nemo
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Date: Mon, 28 Oct 2002 15:10:06 +0800
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Hi Pascal, 

We are also interested in the RO problem of NEMO especially in nested
case.  We see that nested mobile nodes is inevitable in a practical
world deployment scenario.

First of, some comments on your RO-Taxonomy draft:

> 2.1 Nested tunnels optimization
> Such a solution introduces the following problems:
> "Pinball" routing ...
> Packet size ...

I think the problem of nested tunnels can be further broken down into:
"pinball" routing
- HA/MR processing resources consumption
- increased latency
increased in packet size
- wireless link bandwidth consumption
- network resource consumption
- more packet fragmentation(by each termination)


> The potential approaches for avoiding the nesting of tunnels include:
> Route Aggregation ...
> Surrogate ...
> Internal Routing and gateway ...
> RRH ...
Routing header can be used to avoid problems you listed, but I think
naming the paragraph RRH is putting adding presumptions on the method of
constructing the Routing Header, since there could be other method to
collect information needed to construct routing header.


> 3. MR-to-CN
>  ...
>  accept the risk.  If not, the optimization may be limited to
>  triangular routing MR->CN->HA->MR.
> ...
I think packet delivery path in this case will not be a triangular
routing(MR->CN->HA->MR), but "dog-leg" routing (MR->HA->CN, CN->HA->MR).


> 6. Conclusion
> ...MIPv6 seems to be...more difficult to probide a Nemo solution
> with backward compatibility, since: ...
> 2) The RR test has no negotiable option and is not open for extension,
What does this sentence mean?
In MIPv6 draft #18, each messages in RR test can contain some mobility
option field.  These option fields can be used to carry other
information. In addition, we can modify the way each cookie is generated
at CN side if necessary.

For your "call for debate" in laying down the RO requirements, it is a
good idea.  We will try to write down something concrete for futher
discussion in the mailing list.

On a side note, we think there wont be any time slots for discussion
about RO solutions in the upcoming IETF meeting, but if we can laid down
some set of requirements for RO, perhaps we can request for a time slot
to discuss the problem scope of RO?

------------
Takeshi



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Subject: RE: [nemo] Route Optimization in Nemo
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "Takeshi TANAKA" <Takeshi.Tanaka@yrp.mci.mei.co.jp>,
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> -----Original Message-----
> From: Takeshi TANAKA [mailto:Takeshi.Tanaka@yrp.mci.mei.co.jp]=20
> Sent: lundi 28 octobre 2002 08:10
> To: Pascal Thubert (pthubert); IETF NEMO
> Subject: Re: [nemo] Route Optimization in Nemo
>=20
>=20
> Hi Pascal,=20
>=20
> We are also interested in the RO problem of NEMO especially=20
> in nested case.  We see that nested mobile nodes is=20
> inevitable in a practical world deployment scenario.
>=20
> First of, some comments on your RO-Taxonomy draft:
>=20
> > 2.1 Nested tunnels optimization
> > Such a solution introduces the following problems:
> > "Pinball" routing ...
> > Packet size ...
>=20
> I think the problem of nested tunnels can be further broken=20
> down into: "pinball" routing
> - HA/MR processing resources consumption
> - increased latency
> increased in packet size
> - wireless link bandwidth consumption
> - network resource consumption
> - more packet fragmentation(by each termination)
>=20
Sure ! Depending on the environment and the implementation, the gating
factor may not be the same in all cases.
>=20
> > The potential approaches for avoiding the nesting of=20
> tunnels include:=20
> > Route Aggregation ... Surrogate ...
> > Internal Routing and gateway ...
> > RRH ...
> Routing header can be used to avoid problems you listed, but=20
> I think naming the paragraph RRH is putting adding=20
> presumptions on the method of constructing the Routing=20
> Header, since there could be other method to collect=20
> information needed to construct routing header.
>=20

Agreed, I'll fix that. RRH could be listed as an example but it's not a
category. I'm not sure how to describe the category, though, and I
expect more discussion when I do, since I mean to differentiate from a
MANET based source routing. What do you think of "standard based source
routing"? Note that the RRH draft presents RRH as an IPv6 header, not a
MIP thing. Then the draft shows how that header could be used by MIP,
though the usage is not restricted to MIP.=20


>=20
> > 3. MR-to-CN
> >  ...
> >  accept the risk.  If not, the optimization may be limited to =20
> > triangular routing MR->CN->HA->MR. ...
> I think packet delivery path in this case will not be a=20
> triangular routing(MR->CN->HA->MR), but "dog-leg" routing=20
> (MR->HA->CN, CN->HA->MR).
>=20

Not sure: The MR can encapsulate packets to the CN instead of the home
agent, potentially at the expense of IPSec. The CN has to support the
encapsulation and it may accept to forward the inner packets even if it
does not trust the MR enough to optimize the reverse direction. This may
defeat ingress filtering, but then it's a matter of policy. Be prepared
for a long debate :)

>=20
> > 6. Conclusion
> > ...MIPv6 seems to be...more difficult to probide a Nemo=20
> solution with=20
> > backward compatibility, since: ...
> > 2) The RR test has no negotiable option and is not open for=20
> extension,
> What does this sentence mean?
> In MIPv6 draft #18, each messages in RR test can contain some=20
> mobility option field.  These option fields can be used to=20
> carry other information. In addition, we can modify the way=20
> each cookie is generated at CN side if necessary.
>=20

OK, I'm being crytic again. I was talking about the RR and CN as
described by MIP. Options give you additional information but there's no
such thing as a completion code or negotiation in RR test. As you
mention, we will have to modify the CN again. The MIP CN is already a
burden, I wonder how difficult it will be to add our stuff into it.  We
could have coped with a simple generic negociation like triangular
yes-no, CareOf yes-no... Which could have been beneficial to MIP as
well.

I tried a few things on the MIP list. Please see 'CoT' and the 'HAO, BE
processing' discussions in July (some appended). I understand it's not a
priority and they want to close the debate, our cost. Same for the HaO,
we would need a CN change to make it multihop. At that point, I believe
that a RH is better ;)

> For your "call for debate" in laying down the RO=20
> requirements, it is a good idea.  We will try to write down=20
> something concrete for futher discussion in the mailing list.
>=20

:)

> On a side note, we think there wont be any time slots for=20
> discussion about RO solutions in the upcoming IETF meeting,=20
> but if we can laid down some set of requirements for RO,=20
> perhaps we can request for a time slot to discuss the problem=20
> scope of RO?
>=20

Agreed, and it's up to the chairmen to do the first thing first. There's
this debate about the requirements for the basic Nemo that will take a
long time in the Agenda. I believe that understanding RO is important
for the design of Basic, but I agree it's not necessarily needed to
establish the requirements.=20

Yet, since some of us are industrials, we can't wait 2 years to have
everything done by the book. If Nemo is too slow, I'm sure companies
will come up with proprietary solutions for the interim, at a cost; so
it's beneficial to start this thread already, even if it means a very
short entry in the Agenda, and offline meetings in Atlanta.

Will you be there?

> ------------
> Takeshi
>=20
>=20

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Subject: [mobile-ip] CoT
Date: Mon, 1 Jul 2002 09:47:18 -0000
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I understand that the RR test is meant for the CN to ensure that the =
remote
mobile node is actually who he says, at least as far as the Home Agent =
knows. So
a CN sends a secret via Home, and hopefully the REAL guy gets it. Then =
the REAL
guy could talk to the CN, using that secret to authenticate himself. =
Now, what
about the CareOf Test? Seems that is it mostly used to check that the =
path to
the MN works. To me, it looks like the first beat of a heartbeat more =
than a
HELLO; we're just missing the next beats to detect when the path becomes
unusable, in which case the home route should be used. Anyway, what =
bothers me
is that the CareOf address is part of the secret that comes with that =
test. When
the MN moves, a new test is needed before the BU, correct?

In general, I do not necessarily see the value of that secret in the CoT =
for
MIP. If the guy at the CoA has the secret from the HoT, then it's him, =
ain't it?

This line of thinking would end up with a flow like:

1) HoT once
2) BU, based on HoT only, when CoA change
3) CoT as a heartbeat


What do you think?

Pascal



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Subject: RE: [mobile-ip] Re: summary of HAO, BE processing discussion
Date: Thu, 18 Jul 2002 16:00:05 -0000
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From: "Pascal Thubert" <pthubert@cisco.com>
To: =?US-ASCII?B?S2VpaWNoaSBTSElNQSAvICI/T2NeZQ==?= <keiichi@iij.ad.jp>,
	<jari.arkko@kolumbus.fi>
Cc: "mat (mailer list)" <mat@cisco.com>,
	<itojun@iijlab.net>,
	<mobile-ip@sunroof.eng.sun.com>,
	<ipng@sunroof.eng.sun.com>
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I think I've been a little cryptic:

Some devices such as a fridge may be happy to have a minimum set of
requirements for IPv6. Other devices such as clustered servers may not
be able to maintain a BCE at all because the cluster IP address is
shared among all the members of the cluster -- unless they perform a new
protocol to distribute the BCEs-. Furthermore, if the cluster uses a
dispatcher that is not on the return path, then the dispatcher cannot
provide the MIP termination, either. However, if that same dispatcher
terminates an IPSEC tunnel, or by other means to be defined later such
as piggy backing, it could be possible to trust a Home address option
and perform triangular routing.=20

Using a Binding Cache as opposed to piggy backing the BU with each
packet assumes that memory scales better than CPU. This seems a
reasonable approach, so does delaying the support of piggybacking. But
still, we must allow for the case where this trade-off does not apply.
Say the dispatcher I just mentioned has a hardware accelerated crypto
engine; say it can cache some recent computations in a LRU fashion; say
it has limited memory capabilities to keep many BCEs long term; and say
it needs to serve requests for a huge amount of unrelated users; in that
case, the trade-off is the wrong choice, and triangular may be the best
can do, unless the client sources its requests with its CoA, which leads
to more open issues. MUSTing a Binding Cache in IPv6 outlaws this
configuration de facto.=20

If we agree that there can be several levels of support by the CN for
RO, then we could define what the behaviour is for each level and how to
negotiate that between the CN and the MN. My suggestion was to do that
negotiation at RR test time so that no bind support would be necessary
unless both parties agree upon bi-directional route optimization.

A way to perform that negotiation is to give a meaning to the response
to HoTi and CoTi. This may be achieved by adding negative Return Code to
Hot Cot, and mostly by accepting an ICMP error as a 'no' response.

So 'No' to Both HoTi and CoTi means no bind updates, and usage of the
bidir MN-HA tunnel, which ensures compatibility with minimum and legacy
stacks, as per the draft
'Yes' to both HoTi and CoTi means let's go with the bind update, as per
the draft
'Yes' to CoTi only means support for Home Address option but not for
Bind Cache
'Yes' to HoTi only does not make sense to me at the moment ???

This is not exactly the way the draft presents things, mostly for the
triangular part. Also, the draft is heavily biased (e.g. 8.1) in such a
way as to let the reader believe that MIP could not work without support
of the Home Address option by all nodes, "since otherwise communications
may be impossible". I believe that this is misleading, and that we
should rather explain the different scenarios and pro/cons of each level
of support by the CN. I believe we          ShOuLd at least replace all
occurrences of MUST by SHOULD in 8.1.=20

Does that make sense?

Pascal

-----Original Message-----
From: owner-mobile-ip@sunroof.eng.sun.com
[mailto:owner-mobile-ip@sunroof.eng.sun.com]On Behalf Of Keiichi SHIMA /
"?OEc^e
Sent: Thursday, July 18, 2002 7:19 AM
To: jari.arkko@kolumbus.fi
Cc: mat@cisco.com; itojun@iijlab.net; mobile-ip@sunroof.eng.sun.com;
ipng@sunroof.eng.sun.com
Subject: [mobile-ip] Re: summary of HAO, BE processing discussion

Let me add one thing.

From: Jari Arkko <jari.arkko@kolumbus.fi>

> * IPv6 WG has in the past accepted the HAO as a mandatory
>    feature for all IPv6 nodes. Arguments have been made,
>    however, that the processing of the HAO has been changed
>    and the situation may now be different.

In addition, the current draft requires not only HAO but also BE.
This means all IPv6 nodes must implement a new extention header
(mobility header).

I never say that such a mechanism is bad at all.  It is good of
course.  But from the view of the fast deployment of both IPv6 and
Mobile IPv6, I personally think it better not to require additional
requirements...  This is not the view of the protocol designer,
though.

I'm probablly a bad designer and a bad scientist.  I just want a real
IPv6 and a Mobile IPv6...

Best Regards,

---
Keiichi SHIMA
IIJ Research Laboratory <keiichi@iij.ad.jp>
KAME Project <keiichi@kame.net>

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From: "=?iso-8859-1?B?UGVra2EgUOTka2v2bmVu?=" <Pekka.Paakkonen@vtt.fi>
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Subject: [nemo] IPv6 prefix delegation
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Hi ,

I was wondering is IPv6 prefix delegation for the links of a Mobile =
Network part of NEMO-WG focus?
Should NEMO pay attention on this subject at all or does it belong =
entirely to some other working group?

Pekka P=E4=E4kk=F6nen


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charset=3Dwindows-1252">
<META content=3D"MSHTML 5.50.4134.600" name=3DGENERATOR></HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2>Hi ,</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>I was wondering is IPv6 prefix delegation for the =
links of a=20
Mobile Network part of NEMO-WG focus?</FONT></DIV>
<DIV><FONT size=3D2>Should&nbsp;NEMO pay attention on this subject at =
all=20
or&nbsp;does it belong entirely to&nbsp;some other working =
group?</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>Pekka P=E4=E4kk=F6nen</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV></BODY></HTML>

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Hi Pekka,
      The original discussion of prefix delegation occurred on
the IPv6 WG mailing list.  The zerouter BoF being held in Atlanta
is also going be interested in the subject.  I can see where NEMO
needs to be involved as well.

Regards,
Brian

Pekka Pääkkönen wrote:
> Hi ,
>  
> I was wondering is IPv6 prefix delegation for the links of a Mobile 
> Network part of NEMO-WG focus?
> Should NEMO pay attention on this subject at all or does it belong 
> entirely to some other working group?
>  
> Pekka Pääkkönen
>  



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Date: 28 Oct 2002 15:00:17 +0100

Dear Sir,

Please accept the following -00 personal draft submission; please
announce this Internet Draft on the IETF Announce mailing list.

Petrescu, et al., "Issues in Designing Mobile IPv6 Network Mobility
with the MR-HA Bidirectional Tunnel (MRHA)".

http://www.nal.motlabs.com/~petrescu/draft-petrescu-nemo-mrha-00.txt

Thank you,

Alex



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Dear all,

We have just re-submit a revision of our internet draft on requirements:

http://www.nal.motlabs.com/nemo/draft-janneteau-nemo-requirements-00.txt

(as a replacement of the former I-D
draft-lach-monet-requirements-00.txt).

Hope this text will be useful for the WG. Any comment is welcome.
Thanks,
Christophe


From nemo-admin@nal.motlabs.com  Mon Oct 28 09:22:40 2002
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Here is the correct URL:

http://www.nal.motlabs.com/nemo/drafts/draft-janneteau-nemo-requirements-00.txt

Sorry,
Christophe

Christophe Janneteau wrote:
> 
> Dear all,
> 
> We have just re-submit a revision of our internet draft on requirements:
> 
> http://www.nal.motlabs.com/nemo/draft-janneteau-nemo-requirements-00.txt
> 
> (as a replacement of the former I-D
> draft-lach-monet-requirements-00.txt).
> 
> Hope this text will be useful for the WG. Any comment is welcome.
> Thanks,
> Christophe


From nemo-admin@nal.motlabs.com  Mon Oct 28 09:25:30 2002
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Subject: Re: [nemo] IPv6 prefix delegation
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	<3DBD38C8.6030709@nc.rr.com>
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Date: 28 Oct 2002 15:22:56 +0100

Brian Haberman <bkhabs@nc.rr.com> writes:
>       The original discussion of prefix delegation occurred on
> the IPv6 WG mailing list.  The zerouter BoF being held in Atlanta
> is also going be interested in the subject.  I can see where NEMO
> needs to be involved as well.

The word "delegation" is also related to security delegation ideas
having been circulated on this list when discussing about LFNs
delegating their MR to do RO on their behalf.  Or something like
that.  Pekka Nikander and Erik Nordmark IIRC.

Alex



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Brian Haberman <bkhabs@nc.rr.com> writes:
>       The original discussion of prefix delegation occurred on
> the IPv6 WG mailing list.  The zerouter BoF being held in Atlanta
> is also going be interested in the subject.  I can see where NEMO
> needs to be involved as well.

Brian, where does NEMO need to be involved with prefix delegation?

Thanks,

Alex



From nemo-admin@nal.motlabs.com  Mon Oct 28 10:54:09 2002
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Alexandru Petrescu wrote:
> Brian Haberman <bkhabs@nc.rr.com> writes:
> 
>>      The original discussion of prefix delegation occurred on
>>the IPv6 WG mailing list.  The zerouter BoF being held in Atlanta
>>is also going be interested in the subject.  I can see where NEMO
>>needs to be involved as well.
> 
> 
> Brian, where does NEMO need to be involved with prefix delegation?
> 

When a mobile network connects to a new site, that site may
be using prefix delegation in order to communicate with the
stationary router.  Several prefix delegation models allow
for the negotiation of things like the routing protocol to use
for the connection.

Regards,
Brian



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To: "Alexandru Petrescu" <petrescu@crm.mot.com>
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Date: Mon, 28 Oct 2002 16:52:35 -0000
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There are basically 3 ways for the HA to establish routes to the mobile
networks via the MR:

1) static model: routes are statically configured at the HA, and the
networks are pre-configured on the MR interfaces as well.

2) Dynamic model: A protocol is used by the MR to advertise its networks
to the HA so the HA does not need prior config. The protocol could be a
traditional IGP over the home tunnel, or a MIP extension such as
proposed by Thierry's draft.

3) Delegation - there we are -: The MR learns the prefixes on its
network from the HA. This could be done using DHCPv6 when it's an RFC,
or other (still debated at IPv6 without even MIP in the picture !!!)

Pascal

> -----Original Message-----
> From: Alexandru Petrescu [mailto:petrescu@crm.mot.com] 
> Sent: lundi 28 octobre 2002 15:50
> To: Brian Haberman
> Cc: nemo@nal.motlabs.com
> Subject: Re: [nemo] IPv6 prefix delegation
> 
> 
> Brian Haberman <bkhabs@nc.rr.com> writes:
> >       The original discussion of prefix delegation occurred on the 
> > IPv6 WG mailing list.  The zerouter BoF being held in 
> Atlanta is also 
> > going be interested in the subject.  I can see where NEMO 
> needs to be 
> > involved as well.
> 
> Brian, where does NEMO need to be involved with prefix delegation?
> 
> Thanks,
> 
> Alex
> 
> 


From nemo-admin@nal.motlabs.com  Mon Oct 28 12:00:52 2002
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Date: 28 Oct 2002 18:00:27 +0100

"Pascal Thubert (pthubert)" <pthubert@cisco.com> writes:
> There are basically 3 ways for the HA to establish routes to the mobile
> networks via the MR:
> 
> 1) static model: routes are statically configured at the HA, and the
> networks are pre-configured on the MR interfaces as well.
> 
> 2) Dynamic model: A protocol is used by the MR to advertise its networks
> to the HA so the HA does not need prior config. The protocol could be a
> traditional IGP over the home tunnel, or a MIP extension such as
> proposed by Thierry's draft.

2.5) Dynamic model with ICMP redirects instead of IGP.

> 3) Delegation - there we are -: The MR learns the prefixes on its
> network from the HA. This could be done using DHCPv6 when it's an RFC,
> or other (still debated at IPv6 without even MIP in the picture !!!)

The MR learns its MNPs from the HA when MR is not at home, through the
MRHA tunnel?

I thought Brian was referring to MR learns new prefixes from the
visited network, something like Care-of Prefixes instead of CoA.
Which, in my very humble oppinion, is very much about RO?

Alex



From nemo-admin@nal.motlabs.com  Mon Oct 28 12:50:03 2002
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Subject: Re: [nemo] Route Optimization in Nemo
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	<20021028150706.0A59.TAKESHI.TANAKA@yrp.mci.mei.co.jp>
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Date: 28 Oct 2002 18:49:53 +0100

Takeshi TANAKA <Takeshi.Tanaka@yrp.mci.mei.co.jp> writes:
> For your "call for debate" in laying down the RO requirements, it is a
> good idea.  We will try to write down something concrete for futher
> discussion in the mailing list.

Yes, it's good to have a rough idea about what are the RO
implications.  And I'm also interested in looking into the RO
requirements.  If I were to start a document, I would start with
defining the problem of RO before trying the requirements.  For
example a certain number of points of triangular routing could be
feasible, but no more than n.  So we first must know exactly what is
"number of points of triangular routing".

Me too I'm interested in that, but it's maybe for later.

Alex



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Date: 28 Oct 2002 19:03:14 +0100

Alexandru Petrescu <petrescu@crm.mot.com> writes:
> Takeshi TANAKA <Takeshi.Tanaka@yrp.mci.mei.co.jp> writes:
> > For your "call for debate" in laying down the RO requirements, it is a
> > good idea.  We will try to write down something concrete for futher
> > discussion in the mailing list.
> 
> Yes, it's good to have a rough idea about what are the RO
> implications.  And I'm also interested in looking into the RO
> requirements.  If I were to start a document, I would start with
> defining the problem of RO before trying the requirements.  For
> example a certain number of points of triangular routing could be
> feasible, but no more than n.  So we first must know exactly what is
> "number of points of triangular routing".
> 
> Me too I'm interested in that, but it's maybe for later.

Sorry for following up on my own email.

A good definition of the RO space is also about stating what are the
non-RO implications to upper layers.  For example, if MN uses TCP, and
if sending packets through the HA to CN, but receiving packets
straight from CN, then this very much looks like an "assymetric" link,
and I think there was recently an iab draft on why it's not good for
TCP to have assymetric links.

I think this is also about RO, but again, for later, maybe I'm posting
too much.

Alex



From nemo-admin@nal.motlabs.com  Mon Oct 28 17:38:49 2002
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IMHO, security is *the* issue for Nemo RO. RR depends on the routing fabric, and
with NEMO, the routing fabric is changing. 

            jak




From nemo-admin@nal.motlabs.com  Mon Oct 28 23:49:02 2002
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Hi all,

I've also updated my requirement draft with the new name:

http://www.nal.motlabs.com/nemo/drafts/draft-ernst-nemo-requirements.txt


Changes: 
- text has been much refined.

- a section "Observation" takes much of what was previously in the
  terminology draft. (so, the terminology draft is now just about the
  terminology)

- new section "Requirements for Basic Support" where I've itemized the
  requirements based on the discussion in the previous section.

  Those requirements are listed in the same fashion as proposed by
  Pascal Thubert a long time ago on the mailing list: clear short
  sentences. 

  It's not a complete list - I've not included requirements proposed
  by other people, but I've expressed them in a way that should
  clarify my point of view on the case. At least that the objective.
 

Don't forget that the terminology draft has also been re-structured:
http://www.nal.motlabs.com/nemo/drafts/draft-ernst-nemo-terminology.txt


Thierry


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Subject: RE: [nemo] Route Optimization in Nemo
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "Alexandru Petrescu" <petrescu@crm.mot.com>,
        "Takeshi TANAKA" <Takeshi.Tanaka@yrp.mci.mei.co.jp>,
        "Holger Kempf (hkempf)" <hkempf@cisco.com>
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Hi Alex

> If I were to start a document, I would start 
> with defining the problem of RO

That's the draft I humbly started. Maybe that was unclear? My draft is
elaborating on the taxonomy of the RO problem space, since it has
multiple aspects in Nemo. Once this work is complete, I expect we'll be
able to write a problem statement, in which security and AAA will be key
issues. Then will be able to write requirements. 

What do you think?

Pascal
> -----Original Message-----
> From: Alexandru Petrescu [mailto:petrescu@crm.mot.com] 
> Sent: lundi 28 octobre 2002 18:50
> To: Takeshi TANAKA
> Cc: Pascal Thubert (pthubert); IETF NEMO
> Subject: Re: [nemo] Route Optimization in Nemo
> 
> 
> Takeshi TANAKA <Takeshi.Tanaka@yrp.mci.mei.co.jp> writes:
> > For your "call for debate" in laying down the RO 
> requirements, it is a 
> > good idea.  We will try to write down something concrete for futher 
> > discussion in the mailing list.
> 
> Yes, it's good to have a rough idea about what are the RO 
> implications.  And I'm also interested in looking into the RO 
> requirements.  If I were to start a document, I would start 
> with defining the problem of RO before trying the 
> requirements.  For example a certain number of points of 
> triangular routing could be feasible, but no more than n.  So 
> we first must know exactly what is "number of points of 
> triangular routing".
> 
> Me too I'm interested in that, but it's maybe for later.
> 
> Alex
> 
> 


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To: nemo@nal.motlabs.com
Subject: Re: [nemo] Route Optimization in Nemo
From: Thierry Ernst <ernst@sfc.wide.ad.jp>
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> > If I were to start a document, I would start 
> > with defining the problem of RO

This is tough. How to define the problem without basing the arguments
on a solution ?  If the argumentation is based on a solution, how are
we sure we understand the problem space well enough ?
 
> That's the draft I humbly started. Maybe that was unclear? My draft is
> elaborating on the taxonomy of the RO problem space, since it has
> multiple aspects in Nemo. Once this work is complete, I expect we'll be
> able to write a problem statement, in which security and AAA will be key
> issues. Then will be able to write requirements. 





From nemo-admin@nal.motlabs.com  Tue Oct 29 04:45:28 2002
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From: "JinHyeock Choi" <athene@sait.samsung.co.kr>
To: <nemo@nal.motlabs.com>, "Thierry Ernst" <ernst@sfc.wide.ad.jp>
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Subject: Re: [nemo] Terminology Update
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Hi Thierry
 
Here are some comments on your Terminology draft
 
1) I wonder how to define 'Mobile Network Prefix' for 'Nested Mobility' case. 
    If Mobile Network is composed by only one IP-subnet, we can easily define 
    Mobile Network Prefix as you defined in [Page 7]
 
Mobile Network Prefix
 
      A bit string that consists of some number of initial bits of an IP
      address which identifies the entire mobile network within the
      Internet topology. All MNNs necessarily have an address named
      after this prefix.
 
    But in Nested Mobility case, parent-NEMO and sub-NEMO may have different 
    Mobile Network Prefix. In that case, how would you define the Mobile Network 
    Prefix for the aggregated Mobile Network? Can we make a definition such that 
    all MNNs have an address named after that Mobile Network Prefix?  
 
2) In [Page 7], Local Mobile Node (LMN) is defined like below 
 
Local Mobile Node (LMN)
 
      A mobile node (MN) or a mobile router (MR) that belongs to the
      mobile network (i.e. its home link is within the mobile network).
 
    But according to some people LMN is defined alternatively
 
     A mobile node that resides in mobile network and never leave that 
     mobile network. 
 
   Those two definitions are not same. For example, according to the first
   definition, 'LMN's HA can't be MR's Home Agent' as Alex explained.  
   I think we should clarify it lest there should be confusion.

3) In [Page 11], multihomed is defined like below  
 
So, a mobile network is multihomed when either:
      - a MR has multiple egress interfaces on the same foreign link
      - a MR has multiple egress interfaces on distinct foreign link
      - there are more than one MR in the mobile network
 
   In the third line, how about change from 'more than one MR' to 
  'more than one TLMR'? In Nested Mobility case, some Mobile Network 
   may have multiple MRs without being multihomed. 

I wish these comments are useful. Best Regards
 
JinHyeock 
 
 


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Thierry Ernst <ernst@sfc.wide.ad.jp> writes:
> > > If I were to start a document, I would start 
> > > with defining the problem of RO
> 
> This is tough. How to define the problem without basing the arguments
> on a solution ?  If the argumentation is based on a solution, how are
> we sure we understand the problem space well enough ?

So it's about iterarating between problems, potential solutions, back
to problems and so on.

Alex



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Dear JinHyeock,

Interesting comments. Thank you. 

I think the nested case is tricky ... A MR of a mobile network becomes
a TLMR when a sub-NEMO attaches to it. Do you think it's necessary to
reflect that in the terminology ?  If you have an idea to explain it
easily, your definition is welcome !

> Here are some comments on your Terminology draft
>  
> 1) I wonder how to define 'Mobile Network Prefix' for 'Nested Mobility' case. 
>     If Mobile Network is composed by only one IP-subnet, we can easily define 
>     Mobile Network Prefix as you defined in [Page 7]
>  
> Mobile Network Prefix
>  
>       A bit string that consists of some number of initial bits of an IP
>       address which identifies the entire mobile network within the
>       Internet topology. All MNNs necessarily have an address named
>       after this prefix.
>  
>     But in Nested Mobility case, parent-NEMO and sub-NEMO may have different 
>     Mobile Network Prefix. In that case, how would you define the Mobile Network 
>     Prefix for the aggregated Mobile Network? Can we make a definition such that 
>     all MNNs have an address named after that Mobile Network Prefix?  

For this one, I have the answer.

Each mobile network in the nested mobile network has its own Mobile
Network Prefix and keeps it. The MR of a sub-NEMO gets a COA with the
prefix of its parent-NEMO. So, from the point of view of the TLMR,
there is only one prefix. No need to care about prefixes down the
hierarchy. At least this is what happens in Basic Support.

In case of Extended Support, we may have to define new terms if this
is not true anymore. 


> 2) In [Page 7], Local Mobile Node (LMN) is defined like below 
>  
> Local Mobile Node (LMN)
>  
>       A mobile node (MN) or a mobile router (MR) that belongs to the
>       mobile network (i.e. its home link is within the mobile network).

(A)
  
>     But according to some people LMN is defined alternatively
>  
>      A mobile node that resides in mobile network and never leave that 
>      mobile network. 

(B)
  
>    Those two definitions are not same. For example, according to the first
>    definition, 'LMN's HA can't be MR's Home Agent' as Alex explained.  
>    I think we should clarify it lest there should be confusion.

(C)

(A) does not prevent (B). (B) is more restrictive. The problem you
mention in (C) may require to refine the definition of LMN.

As stated in the draft and on the mailing list, this is NOT a final
definition. The definition may even not be necessary once we agree on
the requirement. 

> 
> 3) In [Page 11], multihomed is defined like below  
>  
> So, a mobile network is multihomed when either:
>       - a MR has multiple egress interfaces on the same foreign link
>       - a MR has multiple egress interfaces on distinct foreign link
>       - there are more than one MR in the mobile network
>  
>    In the third line, how about change from 'more than one MR' to 
>   'more than one TLMR'? In Nested Mobility case, some Mobile Network 
>    may have multiple MRs without being multihomed. 

From the perspective of nested mobile networks, what a MR is is
tricky.

1. At first we have 2 mobile networks. Mobile networks is multihomed via
2 MRs.


    lx ______ Internet______________ ly
        |          |            |
       MR.1        ---MR.2.1  MR.2.2
        |               |      |
    l1 ------         ----------  l2
        

2. What happens when MR.2.1. attaches to l1 ?
   
   - MR.2.1 becomes a subservient of MR.1
   - MR.1 is the TLMR for the aggregated network
   - mobile_network_1 is the parent-NEMO (and also the root-NEMO)
   - mobile_network_2 is the sub-NEMO
   - mobile_network_2 is still multihomed to l1 and ly

2. What happens when MR.1 attaches to l2 ?
   - MR.1 becomes a subservient of MR.2.1 and MR.2.2.
   - MR.2.1 and MR.2.2 are the TLMRs 
   - mobile_network_2 is the parent-NEMO (and also the root-NEMO)
   - mobile_network_1 is the sub-NEMO
   - the nested mobile network is multihomed 


So, may be I should include those examples.
 
I don't see an issue in the definition. Do you think the definition
should be clarified ?


Thanks for reading the draft and discussing it.
Thierry


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Date: 29 Oct 2002 13:09:37 +0100

Thierry Ernst <ernst@sfc.wide.ad.jp> writes:
> I've also updated my requirement draft with the new name:
> http://www.nal.motlabs.com/nemo/drafts/draft-ernst-nemo-requirements.txt

Thierry, thank you for keeping your requirements draft updated.

I have remarks related to R1-18 of the new section 4 Requirements for
Basic Support.  It's excellent to have them short and concentrated in
one place of the draft, easier to discuss.

Most of the requirements still look a bit high-level to me, but maybe
that's what requirements are about, to be high-level and easy to
understand.

I'm trying to figure out whether it's possible to find a way to put
requirements on other entities than the MR.  For example, I agree with
the definition of a VMN as being a Mobile IPv6 Mobile Node that comes
into and leaves a mobile network.  But I have difficulty in thinking
that this is more than a definition, which you seem to imply, i.e.  a
requirement.

Case in point is R4.  The way in which the nemo-mrha (mobile network
with bidir tunnel MR to HA) supports VMNs and LMNs is by having MNs
that run vanilla Mobile IPv6 and that can move in two ways: (1) only
internal to the mobile network, or (2) coming from outside, move
inside the mobile network and then leave the mobile network.  This can
be accomplished by using vanilla Mobile IPv6 only, no need to
distinguish LMN and VMN for more than a scenario discussion purpose.
If we distinguish, one might be tempted into believing VMNs and LMNs
will behave differently than a Mobile IPv6 MN.  I might have lost
something in this view, please correct me if I'm wrong.

This is partly solved by R6, if I understand correctly, where it says
that MNN's are not nemo-enabled.  But then we must be sure that MR's
are not part of MNN's; the current definition says that an MNN can be
an MR, but MR's are clearly nemo-enabled.

And we should solve the "MN" problem where the name "MN" stands for
either MH and MR, while we are mostly accustomed to say "MN" for "MH"
only.

"R8: A VMN that gets attached to a link within the mobile network
obtains an address on that link."  is a requirement?  If it does not
obtain an address valid on that link then nothing works.  Or maybe we
should leave it there in order to be sure.

R13, 14: please, why do you believe that horizontal and vertical
handoffs must be supported?  If those two are MUSTs then I would also
suggest support of diagonal handoff is a MUST as well.  Or maybe
neither?

For the rest of R's I'm mostly agreeing with them and I find they are
more correctly formulated, and useful for designing an mrha solution.

Alex



From nemo-admin@nal.motlabs.com  Tue Oct 29 07:32:37 2002
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From: "=?iso-8859-1?B?UGVra2EgUOTka2v2bmVu?=" <Pekka.Paakkonen@vtt.fi>
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Subject: [nemo] IPv6 prefix delegation
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Date: Tue, 29 Oct 2002 14:36:38 +0200

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                   CN
                    |
               ---------------
             (  Internet    )--HA=20
               ---------------
                   |
                  AR                           linkX/prefix X            =
    =20
                   |                        MR2-------------------MN2=20
                   | link1/prefix1
                   |=20
                  MR1              =20
                   |
                   | link2/prefix 2
                   |
                  MN1
               =20
Hi all.                              =20
Please consider the above picture. MR2 and MN2 on linkX want to =
establish a NEMO-network (consists of MR2 and MN2).=20
It is assumed that MR2 needs to dynamically get a IPv6 prefix X for the =
NEMO, because the NEMO-network is created in an ad-hoc way.
When this new NEMO is created and attached to Internet via AR or MR1 the =
following questions arise:=20

1.) Where will the IPv6 prefix for the NEMO be received from? From AR, =
HA or MR1 or some other network entity?

2.) What are the protocol requirements for IPv6 prefix delegation in a =
NEMO environment?=20

3.) Do we need IPv6 prefix delegation for NEMO environment? The picture =
suggests yes, because no IPv6 prefix has been initially allocated for =
the NEMO.


Should these issues be concerned with in the requirements related to =
NEMO?


Pekka P=E4=E4kk=F6nen


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dwindows-1252">
<META content=3D"MSHTML 5.50.4134.600" name=3DGENERATOR></HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
CN</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
|</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;=20
---------------</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;(&nbsp;=20
Internet&nbsp;&nbsp;&nbsp;&nbsp;)--HA </FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;=20
---------------</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
|</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
AR&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;linkX/prefix=20
X&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
MR2-------------------MN2 </FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
| link1/prefix1</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
|&nbsp;</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
MR1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;=20
</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
|</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
| link2/prefix 2</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
|</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
MN1</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;=20
</FONT></DIV>
<DIV><FONT size=3D2>Hi=20
all.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
</FONT></DIV>
<DIV><FONT size=3D2>Please consider the above picture. MR2 and MN2 on =
linkX want=20
to establish a&nbsp;NEMO-network (consists of MR2 and MN2). =
</FONT></DIV>
<DIV><FONT size=3D2>It is assumed that MR2 needs to dynamically&nbsp;get =
a IPv6=20
prefix X&nbsp;for the NEMO, because the NEMO-network is created in an =
ad-hoc=20
way.</FONT></DIV>
<DIV><FONT size=3D2>When this&nbsp;new NEMO is created and attached to =
Internet=20
via AR or MR1&nbsp;the following questions arise: </FONT></DIV>
<DIV><FONT size=3D2></FONT><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>1.) Where will the IPv6 prefix for the&nbsp;NEMO be =
received=20
from? From AR, HA or MR1 or some other network entity?</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>2.) What are the protocol requirements for IPv6 =
prefix=20
delegation in a NEMO environment? </FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>3.) Do we need IPv6 prefix delegation for NEMO =
environment?=20
The picture suggests yes, because no IPv6 prefix has been initially =
allocated=20
for the NEMO.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>Should these&nbsp;issues be concerned with =
in&nbsp;the=20
requirements related to NEMO?</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>Pekka P=E4=E4kk=F6nen</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV></BODY></HTML>

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Subject: RE: [nemo] IPv6 prefix delegation
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
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Date: Tue, 29 Oct 2002 13:27:35 -0000

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IMHO, the questions are definitively valid for Nemo, even non nested. =
There are related issues being discussed at DHCPv6, for instance =
subnetting, that could be of some specific interest for Nemo.=20
=20
For Basic, I'm not sure if we include that?=20
=20
Pascal

-----Original Message-----
From: Pekka P=E4=E4kk=F6nen [mailto:Pekka.Paakkonen@vtt.fi]=20
Sent: mardi 29 octobre 2002 13:37
To: nemo@nal.motlabs.com
Subject: [nemo] IPv6 prefix delegation


=20
                   CN
                    |
               ---------------
             (  Internet    )--HA=20
               ---------------
                   |
                  AR                           linkX/prefix X            =
    =20
                   |                        MR2-------------------MN2=20
                   | link1/prefix1
                   |=20
                  MR1              =20
                   |
                   | link2/prefix 2
                   |
                  MN1
               =20
Hi all.                              =20
Please consider the above picture. MR2 and MN2 on linkX want to =
establish a NEMO-network (consists of MR2 and MN2).=20
It is assumed that MR2 needs to dynamically get a IPv6 prefix X for the =
NEMO, because the NEMO-network is created in an ad-hoc way.
When this new NEMO is created and attached to Internet via AR or MR1 the =
following questions arise:=20
=20
1.) Where will the IPv6 prefix for the NEMO be received from? From AR, =
HA or MR1 or some other network entity?
=20
2.) What are the protocol requirements for IPv6 prefix delegation in a =
NEMO environment?=20
=20
3.) Do we need IPv6 prefix delegation for NEMO environment? The picture =
suggests yes, because no IPv6 prefix has been initially allocated for =
the NEMO.
=20
=20
Should these issues be concerned with in the requirements related to =
NEMO?
=20
=20
Pekka P=E4=E4kk=F6nen
=20


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<BODY bgColor=3D#ffffff>
<DIV><SPAN class=3D773122213-29102002><FONT face=3DArial color=3D#000080 =
size=3D2>IMHO,=20
the questions are definitively valid for Nemo, even non nested. There =
are=20
related issues being discussed at DHCPv6, for instance subnetting, that =
could be=20
of some specific interest for Nemo.
<DIV></FONT></SPAN>&nbsp;</DIV></DIV>
<DIV><SPAN class=3D773122213-29102002><FONT face=3DArial color=3D#000080 =
size=3D2>For=20
Basic, I'm not sure if we include that? </FONT></SPAN></DIV>
<DIV><SPAN class=3D773122213-29102002></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D773122213-29102002></SPAN><SPAN =
class=3D773122213-29102002><FONT=20
face=3DArial color=3D#000080 size=3D2>Pascal</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000080 2px =
solid; MARGIN-RIGHT: 0px">
  <DIV></DIV>
  <DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr =
align=3Dleft><FONT=20
  face=3DTahoma size=3D2>-----Original Message-----<BR><B>From:</B> =
Pekka P=E4=E4kk=F6nen=20
  [mailto:Pekka.Paakkonen@vtt.fi] <BR><B>Sent:</B> mardi 29 octobre 2002 =

  13:37<BR><B>To:</B> nemo@nal.motlabs.com<BR><B>Subject:</B> [nemo] =
IPv6 prefix=20
  delegation<BR><BR></FONT></DIV>
  <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  CN</FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  |</FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;=20
  ---------------</FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;(&nbsp;=20
  Internet&nbsp;&nbsp;&nbsp;&nbsp;)--HA </FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;=20
  ---------------</FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  |</FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  =
AR&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;linkX/prefix=20
  =
X&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  =
|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  MR2-------------------MN2 </FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  | link1/prefix1</FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  |&nbsp;</FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  =
MR1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;=20
  </FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  |</FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  | link2/prefix 2</FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  |</FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  MN1</FONT></DIV>
  <DIV><FONT=20
  =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;=20
  </FONT></DIV>
  <DIV><FONT size=3D2>Hi=20
  =
all.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  </FONT></DIV>
  <DIV><FONT size=3D2>Please consider the above picture. MR2 and MN2 on =
linkX want=20
  to establish a&nbsp;NEMO-network (consists of MR2 and MN2). =
</FONT></DIV>
  <DIV><FONT size=3D2>It is assumed that MR2 needs to =
dynamically&nbsp;get a IPv6=20
  prefix X&nbsp;for the NEMO, because the NEMO-network is created in an =
ad-hoc=20
  way.</FONT></DIV>
  <DIV><FONT size=3D2>When this&nbsp;new NEMO is created and attached to =
Internet=20
  via AR or MR1&nbsp;the following questions arise: </FONT></DIV>
  <DIV><FONT size=3D2></FONT><FONT size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT size=3D2>1.) Where will the IPv6 prefix for the&nbsp;NEMO =
be received=20
  from? From AR, HA or MR1 or some other network entity?</FONT></DIV>
  <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT size=3D2>2.) What are the protocol requirements for IPv6 =
prefix=20
  delegation in a NEMO environment? </FONT></DIV>
  <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT size=3D2>3.) Do we need IPv6 prefix delegation for NEMO =
environment?=20
  The picture suggests yes, because no IPv6 prefix has been initially =
allocated=20
  for the NEMO.</FONT></DIV>
  <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT size=3D2>Should these&nbsp;issues be concerned with =
in&nbsp;the=20
  requirements related to NEMO?</FONT></DIV>
  <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT size=3D2>Pekka P=E4=E4kk=F6nen</FONT></DIV>
  <DIV><FONT size=3D2></FONT>&nbsp;</DIV></BLOCKQUOTE></BODY></HTML>

------_=_NextPart_001_01C27F4E.F1A42ADA--


From nemo-admin@nal.motlabs.com  Tue Oct 29 09:43:06 2002
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Subject: Re: [nemo] Route Optimization in Nemo
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From: Alexandru Petrescu<petrescu@crm.mot.com>
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Date: 29 Oct 2002 15:39:26 +0100

"Pascal Thubert (pthubert)" <pthubert@cisco.com> writes:
> > If I were to start a document, I would start 
> > with defining the problem of RO
> 
> That's the draft I humbly started. Maybe that was unclear?

No no that was clear, and thank you for starting it at this early
time.  I read it, so there's at least one reader.  I also read RRH and
I'm going to describe it in a technical report as well.  (then
somebody else can describe my description and so on).

Frankly speaking, my problem is that the draft is already started and
it already has a certain flavor.  It has the tunnel nestedness and the
RRH bias.

If I were to start, I would start with the simplest common denominator
of all that's been discussed, something simple and easy to understand,
nothing new, no innovation.

Define "triangle routing", "dog-leg routing", RO, and their origins.

Make a few sketches with the classic Mobile IPv6 RO
problem, then add the mrha thingie, and then see another sketch with
several HAs and so on.

Then I would describe a practical case when RO is bad for when I go to
a conference and all my communication goes to home (because I use
VPN).

Then I would describe an exemple with practical case where RO-less
Mobile IPv6 can be bad for TCP.

Then I would indicate to the reader that those two problems are even
worse when the triangle has more than three corners (several HA's).

Then I would talk about nested mobile networks, with multi-homing,
where there are sketches with paths that are shortest than what
nemo-mrha proposes.  (you touch briefly the nested RO need).

Remark no new solution proposed, no talk about DHCP, prefix
delegation, no RRH, no HoTI/CoTI, no DSR, no too high bandwidth
consumption (how high?), no CR (Correspondent-side Router, Core
Router, FA?).

That makes up a table of contents, with a little bit of contents too.
Then I would reserve more than 15 minutes for formatting before the
deadline.

That's what my approach would be but it is most certainly different
than anyone else's who would have decided to start such a document.
So please take it as my humble oppinion only; and also as a statement
that maybe I won't write such a document :-)

Thanks,

Alex



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Subject: Re: [nemo] Route Optimization in Nemo
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Date: 29 Oct 2002 16:58:43 +0100

"James Kempf" <kempf@docomolabs-usa.com> writes:
> IMHO, security is *the* issue for Nemo RO. RR depends on the routing
> fabric, and with NEMO, the routing fabric is changing.

Aha, that is well said, the routing fabric seems to be changing,
because mobile networks nest one under the other and as such, the
deepest mobile network will have a set of mobile networks above it
before reaching the fixed infrastructure.  And that set of mobile
networks are changing.

And, while with the current RR tests an MH can think that paths are
secure, in nested mobility the deepest MR can not be sure that one
middle-level mobile network is trustful.  But if I assume that every
MR in this nested structure has done AAA before obtaining
connectivity, then the deepest MR will have less reason to worry.

But yes, IMHO too, RR tests and security are important issues for NEMO
RO for the fact that the normal RR is assuming the CoA and the HoA are
in the same machine (MH), and in the NEMO case, the CoA is of MR and
the HoA is of an LFN, so LFN and MR must trust each other.

What do you think?

Alex



From nemo-admin@nal.motlabs.com  Tue Oct 29 12:06:46 2002
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Subject: Re: [nemo] IPv6 prefix delegation
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"Pekka Pääkkönen" <Pekka.Paakkonen@vtt.fi> writes:
>                    CN
>                     |
>                ---------------
>              (  Internet    )--HA 
>                ---------------
>                    |
>                   AR                           linkX/prefix X                 
>                    |                        MR2-------------------MN2 
>                    | link1/prefix1
>                    | 
>                   MR1               
>                    |
>                    | link2/prefix 2
>                    |
>                   MN1

Good picture.

> Hi all.                               
> Please consider the above picture. MR2 and MN2 on linkX want to
> establish a NEMO-network (consists of MR2 and MN2).  It is assumed
> that MR2 needs to dynamically get a IPv6 prefix X for the NEMO,
> because the NEMO-network is created in an ad-hoc way.

That's a nice statement, but if it is done in an ad-hoc way, then I
believe it's a manet problem, not a NEMO problem.  I think we can see
it as a NEMO problem only if we want MN2 to get a new CoA once MR2 had
attached under MR1, but I thought this will not happen and MN2 will
not have to deal with any form of mobility (I assume that's why you
attached MN2 to MR2, presumably like an LFN).

> When this new NEMO is created and attached to Internet via AR or MR1
> the following questions arise:
> 
> 1.) Where will the IPv6 prefix for the NEMO be received from? From
> AR, HA or MR1 or some other network entity?

So it's assumed that a mobile network will receive a new prefix
(instead of a CoA), let's say a CoP (Care-of Prefix) when it moves.
This might be very useful for RO.  This might be done with Router
Renumbering as well.  This might be done with other routing protocols
as well.

> 2.) What are the protocol requirements for IPv6 prefix delegation in
> a NEMO environment?

Off the top of my head: security requirements.

> 3.) Do we need IPv6 prefix delegation for NEMO environment? The
> picture suggests yes, because no IPv6 prefix has been initially
> allocated for the NEMO.

Initially, there's a prefix allocated to the mobile network when the
mobile network is at home.  Let's call it MNP (mobile network prefix).
The mobile network can continue to use this MNP wherever it moves, and
only the MR will obtain a CoA (not a CoP).  The MR maintains a
bidirectional tunnel with the HA through which all communication of
LFNs goes.  This has obvious inconvenients like multiple tunnels when
nested nets (for which RRH is a solution), or lack of RO with the CN
and so on.  These drawbacks should be described somewhere.  But
inspite of these obvious drawbacks it still offers a solution for
mobile networks, nested nets, with minimal modifications to Mobile
IPv6.  Looks like a good first step.

> Should these issues be concerned with in the requirements related to
> NEMO?

I think yes, in the NEMO RO requirements case.

Alex



From nemo-admin@nal.motlabs.com  Tue Oct 29 12:31:55 2002
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Thierry,

As you may be aware, the Seamoby WG currently has a WG draft on its charter that
consolidates mobility related terms in the IETF. The draft is meant to be a way
for draft authors of mobility-related drafts to avoid the extensive terminology
section at the beginning, and provide a reference to normalize references to
mobility-related terms.

Would you be interested in merging your terminology draft in with the Seamoby
draft? I think it would be extremely useful to have the mobile network terms
together with the rest of the mobility-related terms.

            jak



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From: Takeshi TANAKA <Takeshi.Tanaka@yrp.mci.mei.co.jp>
To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>,
        IETF NEMO <nemo@nal.motlabs.com>
Subject: Re: [nemo] Route Optimization in Nemo
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Date: Wed, 30 Oct 2002 12:27:04 +0900
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Hi Pascal,

Sorry for late reply,

At Mon, 28 Oct 2002 09:17:33 -0000 
"Pascal Thubert (pthubert)" <pthubert@cisco.com> wrote :

> > -----Original Message-----
> > From: Takeshi TANAKA [mailto:Takeshi.Tanaka@yrp.mci.mei.co.jp] 
> > Sent: lundi 28 octobre 2002 08:10
> > To: Pascal Thubert (pthubert); IETF NEMO
> > Subject: Re: [nemo] Route Optimization in Nemo
> > 
> > 
> > Hi Pascal, 
> > 
> > We are also interested in the RO problem of NEMO especially 
> > in nested case.  We see that nested mobile nodes is 
> > inevitable in a practical world deployment scenario.
> > 
> > First of, some comments on your RO-Taxonomy draft:
> > 
> > > 2.1 Nested tunnels optimization
> > > Such a solution introduces the following problems:
> > > "Pinball" routing ...
> > > Packet size ...
> > 
> > I think the problem of nested tunnels can be further broken 
> > down into: "pinball" routing
> > - HA/MR processing resources consumption
> > - increased latency
> > increased in packet size
> > - wireless link bandwidth consumption
> > - network resource consumption
> > - more packet fragmentation(by each termination)
> > 
> Sure ! Depending on the environment and the implementation, the gating
> factor may not be the same in all cases.
> > 
> > > The potential approaches for avoiding the nesting of 
> > tunnels include: 
> > > Route Aggregation ... Surrogate ...
> > > Internal Routing and gateway ...
> > > RRH ...
> > Routing header can be used to avoid problems you listed, but 
> > I think naming the paragraph RRH is putting adding 
> > presumptions on the method of constructing the Routing 
> > Header, since there could be other method to collect 
> > information needed to construct routing header.
> > 
> 
> Agreed, I'll fix that. RRH could be listed as an example but it's not a
> category. I'm not sure how to describe the category, though, and I
> expect more discussion when I do, since I mean to differentiate from a
> MANET based source routing. What do you think of "standard based source
> routing"? Note that the RRH draft presents RRH as an IPv6 header, not a
> MIP thing. Then the draft shows how that header could be used by MIP,
> though the usage is not restricted to MIP. 
We thought that category is for a solution that uses Routing Header
that can contain multiple addresses to avoid a path that goes through all HAs,
and yes I agree to call that category as "standard based source routing".

> > > 3. MR-to-CN
> > >  ...
> > >  accept the risk.  If not, the optimization may be limited to  
> > > triangular routing MR->CN->HA->MR. ...
> > I think packet delivery path in this case will not be a 
> > triangular routing(MR->CN->HA->MR), but "dog-leg" routing 
> > (MR->HA->CN, CN->HA->MR).
> > 
> 
> Not sure: The MR can encapsulate packets to the CN instead of the home
> agent, potentially at the expense of IPSec. The CN has to support the
> encapsulation and it may accept to forward the inner packets even if it
> does not trust the MR enough to optimize the reverse direction. This may
> defeat ingress filtering, but then it's a matter of policy. Be prepared
> for a long debate :)
I misunderstood that "If not, the optimization..." means 
"If we do not modify CN behavior, the optimization", now understand.

> > > 6. Conclusion
> > > ...MIPv6 seems to be...more difficult to probide a Nemo 
> > solution with 
> > > backward compatibility, since: ...
> > > 2) The RR test has no negotiable option and is not open for 
> > extension,
> > What does this sentence mean?
> > In MIPv6 draft #18, each messages in RR test can contain some 
> > mobility option field.  These option fields can be used to 
> > carry other information. In addition, we can modify the way 
> > each cookie is generated at CN side if necessary.
> > 
> 
> OK, I'm being crytic again. I was talking about the RR and CN as
> described by MIP. Options give you additional information but there's no
> such thing as a completion code or negotiation in RR test. As you
> mention, we will have to modify the CN again. The MIP CN is already a
> burden, I wonder how difficult it will be to add our stuff into it.  We
> could have coped with a simple generic negociation like triangular
> yes-no, CareOf yes-no... Which could have been beneficial to MIP as
> well.
> 
> I tried a few things on the MIP list. Please see 'CoT' and the 'HAO, BE
> processing' discussions in July (some appended). I understand it's not a
> priority and they want to close the debate, our cost. Same for the HaO,
> we would need a CN change to make it multihop. At that point, I believe
> that a RH is better ;)
> 
> > For your "call for debate" in laying down the RO 
> > requirements, it is a good idea.  We will try to write down 
> > something concrete for futher discussion in the mailing list.
> > 
> 
> :)
> 
> > On a side note, we think there wont be any time slots for 
> > discussion about RO solutions in the upcoming IETF meeting, 
> > but if we can laid down some set of requirements for RO, 
> > perhaps we can request for a time slot to discuss the problem 
> > scope of RO?
> > 
> 
> Agreed, and it's up to the chairmen to do the first thing first. There's
> this debate about the requirements for the basic Nemo that will take a
> long time in the Agenda. I believe that understanding RO is important
> for the design of Basic, but I agree it's not necessarily needed to
> establish the requirements. 
> 
> Yet, since some of us are industrials, we can't wait 2 years to have
> everything done by the book. If Nemo is too slow, I'm sure companies
> will come up with proprietary solutions for the interim, at a cost; so
> it's beneficial to start this thread already, even if it means a very
> short entry in the Agenda, and offline meetings in Atlanta.
> 
> Will you be there?
Yes, will be there with Chan Wah.

-----------------------------------------------
 Takeshi TANAKA
 Wireless Solution Laboratories, Panasonic
 e-mail: Takeshi.Tanaka@yrp.mci.mei.co.jp
 phone: +81-468-40-5494 / fax: +81-468-40-5183
-----------------------------------------------



From nemo-admin@nal.motlabs.com  Wed Oct 30 04:06:04 2002
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From: "JinHyeock Choi" <athene@sait.samsung.co.kr>
To: <nemo@nal.motlabs.com>, "Thierry Ernst" <ernst@sfc.wide.ad.jp>
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Subject: Re: [nemo] Terminology Update
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Dear Thierry
 
> I think the nested case is tricky ... A MR of a mobile network becomes
> a TLMR when a sub-NEMO attaches to it. Do you think it's necessary to
> reflect that in the terminology ?  If you have an idea to explain it
> easily, your definition is welcome !

Yes, I agree. How about define the terms like 'parent-MR' or 'sub-MR'. 
Those definitions might be useful to describe nested cases.
 
> For this one, I have the answer.
> 
> Each mobile network in the nested mobile network has its own Mobile
> Network Prefix and keeps it. The MR of a sub-NEMO gets a COA with the
> prefix of its parent-NEMO. So, from the point of view of the TLMR,
> there is only one prefix. No need to care about prefixes down the
> hierarchy. At least this is what happens in Basic Support.

So parent-NEMO and sub-NEMO may have entirely different 
Mobile Network Prefix. According to your definition, 'all MNNs necessarily 
have an address named after Mobile Prefix'. I guess that mean 
'all MNNs which are directly attached to MR's ingress interface'. 
 
Your define Mobile Network Prefix with respect to Mobile Network. 
Instead how about define Mobile Network Prefix with respect to Mobile Router 
like 'prefix assigned to ingress interface of Mobile Router'? 
 
> > 2) In [Page 7], Local Mobile Node (LMN) is defined like below 
> >  
> > Local Mobile Node (LMN)
> >  
> >       A mobile node (MN) or a mobile router (MR) that belongs to the
> >       mobile network (i.e. its home link is within the mobile network).
> 
> (A)
>   
> >     But according to some people LMN is defined alternatively
> >  
> >      A mobile node that resides in mobile network and never leave that 
> >      mobile network. 
> 
> (B)
>   
> >    Those two definitions are not same. For example, according to the first
> >    definition, 'LMN's HA can't be MR's Home Agent' as Alex explained.  
> >    I think we should clarify it lest there should be confusion.
> 
> (C)
> 
> (A) does not prevent (B). (B) is more restrictive. 
 
(B) doesn't imply (A). Assume there is a mobile node such that it never 
leave a mobile network but its home link is outside that mobile network. 
That node satisfies (B) but doesn't satisfy (A). Can we preclude such cases?
And (A) doesn't imply (B) either.  

> From the perspective of nested mobile networks, what a MR is is
> tricky.
> 
> 1. At first we have 2 mobile networks. Mobile networks is multihomed via
> 2 MRs.
> 
> 
>     lx ______ Internet______________ ly
>         |          |            |
>        MR.1        ---MR.2.1  MR.2.2
>         |               |      |
>     l1 ------         ----------  l2
>         
> 
> 2. What happens when MR.2.1. attaches to l1 ?
>    
>    - MR.2.1 becomes a subservient of MR.1
>    - MR.1 is the TLMR for the aggregated network
>    - mobile_network_1 is the parent-NEMO (and also the root-NEMO)
>    - mobile_network_2 is the sub-NEMO
>    - mobile_network_2 is still multihomed to l1 and ly
> 
> 2. What happens when MR.1 attaches to l2 ?
>    - MR.1 becomes a subservient of MR.2.1 and MR.2.2.
>    - MR.2.1 and MR.2.2 are the TLMRs 
>    - mobile_network_2 is the parent-NEMO (and also the root-NEMO)
>    - mobile_network_1 is the sub-NEMO
>    - the nested mobile network is multihomed 
> 
> So, may be I should include those examples.
>
> I don't see an issue in the definition. Do you think the definition
> should be clarified ?

Assuem a case which you described in Figure 5 of your draft. That Mobile Network 
is composed by one parent-NEMO and one sub-NEMO. And each NEMO has only 
one MR. That Mobile Network is not multi-homed but has two MRs.  

According to your draft, if there are more than one MR in the mobile network, 
it is multi-homed. I think what you mean is 'if there are more than one MR 
which is attached to fixed Internet.'. 

I may be too scrupulous but tried to interpret your definition literally and found 
some difficulties. 
 
Best Regards
 
JinHyeock


From nemo-admin@nal.motlabs.com  Wed Oct 30 06:27:29 2002
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Subject: Re: [nemo] IPv6 prefix delegation
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Hi


> "Pekka Pääkkönen" <Pekka.Paakkonen@vtt.fi> writes:
> >                    CN
> >                     |
> >                ---------------
> >              (  Internet    )--HA 
> >                ---------------
> >                    |
> >                   AR                           linkX/prefix X                 
> >                    |                        MR2-------------------MN2 
> >                    | link1/prefix1
> >                    | 
> >                   MR1               
> >                    |
> >                    | link2/prefix 2
> >                    |
> >                   MN1
> 
> Good picture.

Yes. It's difficult for me to draw a picture for mailing list. 

> > Hi all.                               
> > Please consider the above picture. MR2 and MN2 on linkX want to
> > establish a NEMO-network (consists of MR2 and MN2).  It is assumed
> > that MR2 needs to dynamically get a IPv6 prefix X for the NEMO,
> > because the NEMO-network is created in an ad-hoc way.
> 
> That's a nice statement, but if it is done in an ad-hoc way, then I
> believe it's a manet problem, not a NEMO problem.  I think we can see
> it as a NEMO problem only if we want MN2 to get a new CoA once MR2 had
> attached under MR1, but I thought this will not happen and MN2 will
> not have to deal with any form of mobility (I assume that's why you
> attached MN2 to MR2, presumably like an LFN).

I agree. MN2 even may not recognize that it has moved at all. 

> > When this new NEMO is created and attached to Internet via AR or MR1
> > the following questions arise:
> > 
> > 1.) Where will the IPv6 prefix for the NEMO be received from? From
> > AR, HA or MR1 or some other network entity?
> 
> So it's assumed that a mobile network will receive a new prefix
> (instead of a CoA), let's say a CoP (Care-of Prefix) when it moves.
> This might be very useful for RO.  This might be done with Router
> Renumbering as well.  This might be done with other routing protocols
> as well.

In basic support, only Mobile Router have to receive CoA in foreign network. 
Mobile Network doesn't have to receive prefix (Care-of Prefix). But I agree 
that it will be useful for RO if Mobile Network get a CoP in foreign network.

> > 2.) What are the protocol requirements for IPv6 prefix delegation in
> > a NEMO environment?
> 
> Off the top of my head: security requirements.
> 
> > 3.) Do we need IPv6 prefix delegation for NEMO environment? The
> > picture suggests yes, because no IPv6 prefix has been initially
> > allocated for the NEMO.
> 
> Initially, there's a prefix allocated to the mobile network when the
> mobile network is at home.  Let's call it MNP (mobile network prefix).
> The mobile network can continue to use this MNP wherever it moves, and
> only the MR will obtain a CoA (not a CoP).  The MR maintains a
> bidirectional tunnel with the HA through which all communication of
> LFNs goes.  This has obvious inconvenients like multiple tunnels when
> nested nets (for which RRH is a solution), or lack of RO with the CN
> and so on.  These drawbacks should be described somewhere.  But
> inspite of these obvious drawbacks it still offers a solution for
> mobile networks, nested nets, with minimal modifications to Mobile
> IPv6.  Looks like a good first step.

Exactly. MNP is configured to the ingress interface of MR and remains same
regardless of MR's movement. 

> > Should these issues be concerned with in the requirements related to
> > NEMO?
> 
> I think yes, in the NEMO RO requirements case.
> 
> Alex

JinHyeock
 


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Subject: [nemo] Launching Requirement Discussion
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Dear all, 

It seems that we have a couple of new/updated drafts to discuss the
requirements, but I haven't seen an announcement from all the authors,
so I'm not sure about what is on the table.

So far, I have seen:
      draft-ernst-nemo-requirements-00.txt 
      draft-ng-nemo-aaa-use-00.txt 
      draft-janneteau-nemo-requirements-00.txt 
      draft-sarikaya-nemo-archreqs-00.txt 

Is anything missing from this list ? I haven't seen an update of TJ's.


Anyway, may I ask all people interested in clearing up the
requirements to read the drafts and to figure out what are their
commonalities and divergences and comment on what is new, what is
still not clear, and what is missing ? 

So far, draft-ng-nemo-aaa has interesting new input about access
control; I haven't read the other drafts yet.

At the meeting, we will have someone to report the results of the
discussion on the requirements, so you should better all express your
views now, before everything is put in shape, hopefully before the
meeting.


Thierry



From nemo-admin@nal.motlabs.com  Thu Oct 31 03:34:55 2002
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From: ChanWah Ng <c_w_ng@yahoo.com>
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Subject: [nemo] draft-ng-nemo-access-router-option-00.txt
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Date: Thu, 31 Oct 2002 00:32:38 -0800 (PST)

Hi all,

We have published a draft on a proposal for overcoming the Nested-Tunnel Optimization. 
This draft introduces an access router option in BU messages, allowing MR to inform their
HA the global address of the NEMO-enabled AR the MR is attached to.  If the AR is also
mobile, the global address will be the HoA of the mobile AR.

Using this, the HA can now independently construct an extended RH2 (as proposed by Pascal
et al) instead of relying on RRH (again, proposed by Pascal et al).  It is difficult to
establish the legitmacy of a RRH, we hope the access router option will provide a means
to reduce the security threats in constructing extended RH2.

We understand that RO is not the focus of the working group at the moment, but we do
believe that there are parties interested enough to look at developing RO solutions in
parallel to basic, so that when the time comes for the WG to look at RO, a reasonably
well thought out solution is already available.  We thus invite interested party to
comment on the draft.

You can find the draft at any of the following URL:

http://www.nal.motlabs.com/nemo/drafts/draft-ng-nemo-access-router-option.txt

http://www.psl.com.sg/draft-ng-nemo-access-router-option-00.txt

Thanks,
Chan-Wah Ng

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To: athene@sait.samsung.co.kr
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Subject: Re: [nemo] Terminology Update
From: Thierry Ernst <ernst@sfc.wide.ad.jp>
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Hi,

From: "JinHyeock Choi" <athene@sait.samsung.co.kr>
> > I think the nested case is tricky ... A MR of a mobile network becomes
> > a TLMR when a sub-NEMO attaches to it. Do you think it's necessary to
> > reflect that in the terminology ?  If you have an idea to explain it
> > easily, your definition is welcome !
> 
> Yes, I agree. How about define the terms like 'parent-MR' or 'sub-MR'. 
> Those definitions might be useful to describe nested cases.

Good idea. Consistent with the current text.
  
> > For this one, I have the answer.
> > 
> > Each mobile network in the nested mobile network has its own Mobile
> > Network Prefix and keeps it. The MR of a sub-NEMO gets a COA with the
> > prefix of its parent-NEMO. So, from the point of view of the TLMR,
> > there is only one prefix. No need to care about prefixes down the
> > hierarchy. At least this is what happens in Basic Support.
> 
> So parent-NEMO and sub-NEMO may have entirely different 
> Mobile Network Prefix. According to your definition, 'all MNNs necessarily 
> have an address named after Mobile Prefix'. I guess that mean 
> 'all MNNs which are directly attached to MR's ingress interface'. 

No, first because the mobile network may have more than one internal
link. And, second because the definition does not say the prefix
identifies the **nested mobile network** but the **mobile network**
where the MNNs are located in.  

I don't see a need to refine this definition as far as Basic Support
is concerned.

> Your define Mobile Network Prefix with respect to Mobile Network. 
> Instead how about define Mobile Network Prefix with respect to Mobile Router 
> like 'prefix assigned to ingress interface of Mobile Router'? 

As said above, the rationale was that a mobile network may contain
several links; these are the same tradeoffs that led me to the design
of the "Prefix Scope Binding Update" draft. (i.e. the need to insert
the prefix and its length in the PSBU).

  
> > > 2) In [Page 7], Local Mobile Node (LMN) is defined like below 
> > >  
> > > Local Mobile Node (LMN)
> > >  
> > >       A mobile node (MN) or a mobile router (MR) that belongs to the
> > >       mobile network (i.e. its home link is within the mobile network).
> > 
> > (A)
> >   
> > >     But according to some people LMN is defined alternatively
> > >  
> > >      A mobile node that resides in mobile network and never leave that 
> > >      mobile network. 
> > 
> > (B)
> >   
> > >    Those two definitions are not same. For example, according to the first
> > >    definition, 'LMN's HA can't be MR's Home Agent' as Alex explained.  
> > >    I think we should clarify it lest there should be confusion.
> > 
> > (C)
> > 
> > (A) does not prevent (B). (B) is more restrictive. 
>  
> (B) doesn't imply (A). Assume there is a mobile node such that it never 
> leave a mobile network but its home link is outside that mobile network. 
> That node satisfies (B) but doesn't satisfy (A). Can we preclude such cases?
> And (A) doesn't imply (B) either.  

Sorry, but if you look at the definition, if the home link is not in
the mobile network, it's a VMN, not a LMN :) So, what's the problem ? 

I kept the terminology abstract enough so that all scenarios could be
discussed; if we agree for some reasons in the requirement discussions
that a LMN should not leave the mobile network, the definition could
be refined later. 

But, instead of discussing if a scenario is permitted or not, I would
prefer you to check the requirements drafts and look if any of them
prevent the scenario you have depicted. 

 
> > From the perspective of nested mobile networks, what a MR is is
> > tricky.
> > 
> > 1. At first we have 2 mobile networks. Mobile networks is multihomed via
> > 2 MRs.
> > 
> > 
> >     lx ______ Internet______________ ly
> >         |          |            |
> >        MR.1        ---MR.2.1  MR.2.2
> >         |               |      |
> >     l1 ------         ----------  l2
> >         
> > 
> > 2. What happens when MR.2.1. attaches to l1 ?
> >    
> >    - MR.2.1 becomes a subservient of MR.1
> >    - MR.1 is the TLMR for the aggregated network
> >    - mobile_network_1 is the parent-NEMO (and also the root-NEMO)
> >    - mobile_network_2 is the sub-NEMO
> >    - mobile_network_2 is still multihomed to l1 and ly
> > 
> > 2. What happens when MR.1 attaches to l2 ?
> >    - MR.1 becomes a subservient of MR.2.1 and MR.2.2.
> >    - MR.2.1 and MR.2.2 are the TLMRs 
> >    - mobile_network_2 is the parent-NEMO (and also the root-NEMO)
> >    - mobile_network_1 is the sub-NEMO
> >    - the nested mobile network is multihomed 
> > 
> > So, may be I should include those examples.
> >
> > I don't see an issue in the definition. Do you think the definition
> > should be clarified ?
> 
> Assuem a case which you described in Figure 5 of your draft. That Mobile Network 
> is composed by one parent-NEMO and one sub-NEMO. And each NEMO has only 
> one MR. That Mobile Network is not multi-homed but has two MRs.  
> 
> According to your draft, if there are more than one MR in the mobile network, 
> it is multi-homed. I think what you mean is 'if there are more than one MR 
> which is attached to fixed Internet.'. 

Here again, the definition didn't say ***nested mobile network*** but
***mobile network***.

So, according to your concern, I should refine the definition of
multihoming to include a case about nested mobile networks.


> I may be too scrupulous but tried to interpret your definition literally and found 
> some difficulties. 

As long as it helps us to refine the terminology that's fine. But I
agree you may be a bit too scrupulous at this stage :)


Thierry


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