[nemo] Re: Comments on draft-clausen-nemo-ro-problem-statement-00.txt

[Ryuji Wakikawa <[e-mail]>]

Hello Carlos

Sorry for late reply.

You are right. 

We can not achieve an optimal route for Internet-toNEMO only with
MANET. In the Internet-to-"Nested"NEMO case, MANET can help optmized
routing for a few hops (that are inside nested NEMO).

For example, if nested MR sends BU with root-MR's CoA, packets are
directly reached to root-MR and root-MR can route packets to the
nested MR by MANET. You may be interested in ORC draft.
http://www1.ietf.org/internet-drafts/draft-wakikawa-nemo-orc-00.txt

thanks
ryuji



At Mon, 08 Nov 2004 10:34:50 +0100,
Carlos Jesús Bernardos Cano wrote:
> 
> [1  <text/plain; iso-8859-15 (quoted-printable)>]
> Hi Ryuji,
> 
> First of all, thanks for submitting the draft.
> 
> Your draft seems to address the problem of the Internet-to-NEMO
> communication and the NEMO-to-NEMO communication when nesting is
> involved, using a MANET approach. I agree with you that in the
> NEMO-to-NEMO approach, having the MRs in a nested-NEMO running an Ad-Hoc
> routing protocol would help to avoid traversing the Internet and also
> avoid the encapsulation. On the other hand, I don't see that clear how
> this would help the Internet-to-NEMO, at least as it is now described in
> the current version of your draft.
> 
> The draft says:
> 
>    "Additionally, this would also ease the Internet-to-NEMO scenario. In
>    order to deliver an IP datagram to a node in the nested NEMO network,
>    only a path to the access router between the nested NEMO network and
>    the Internet would be required: once an IP datagram arrives in the
>    nested NEMO network, the routing tables in the mobile routers, as
>    provided by OLSR, would allow direct routing to the destination.
>    Thus, there would no longer be a requirement to do nested encapsula-
>    tion on each logical hop (i.e. each transversal of a Home Agent) in
>    order to be able to decapsulate and correctly forward IP datagrams in
>    the nested NEMO network.
> 
> 
>    Thus even if no route optimizations are performed in the Internet-to-
>    NEMO scenario, an overhead reduction can still be achieved through
>    much lower encapsulation requirements."
> 
> How this improvements are achieved? If a CN in the Internet sends a
> packet to a MNN that is connected to a nested-NEMO, the packet would
> traverse the HAs of every MR in the nested-NEMO until the MNN is finally
> reached. Therefore, I don't see how this encapsulation would be avoided,
> without making any additional change to the MR and/or HA and/or CN. Am I
> missing something?
> 
> Thanks in advance.
> 
> Kind Regards,
> 
> Carlos J.
> 
> -- 
> Carlos Jesús Bernardos Cano - http://www.it.uc3m.es/cjbc/
> GPG FP: 58C3 4227 AF8D 01D4 5A09  A617 E6F2 B23E DAD6 AA40
> [2 Esta parte del mensaje está firmada	digitalmente <application/pgp-signature (7bit)>]
>