Subject: [nemo] summary of same MNP to mutliple MRs discussion

From: Vijay Devarapalli <[email-masked]>
Date: Wed, 31 Mar 2004 16:17:13 -0800

it took me a while to go through the entire thread. I
am not sure what the problem is. the problem kept
shifting. :) here is a summary (from what I understood).

first of all, the current spec prevents assigning the
same MNP to two mobile routers _if required_. it depends
on what is configured in the Prefix Table on the Home
Agent. if the Prefix Table on the Home Agent says that
a particular MNP was given out only to MR1, the Home
Agent sends a binding ack with status 142 to MR2 when
MR2 sends a BU to the Home Agent.

if the Prefx Table says both MR1 and MR2 are authorized
for a MNP, then it _is_ possible for both MR1 and MR2
to register with the Home Agent with the same MNP at
the same time. the HA then has two routes to the MNP,
one route pointing to MR1 and the second pointing to MR2.
this is what Hesham is talking about. the current NEMO
basic support spec works in this case.

if the Mobile Network splits, with MR1 in one network
and MR2 in another network, both advertising the same
MNP and both registered with the Home Agent, then there
is a problem. Hesham wants this stated in the spec. the
Home Agent could pick the wrong route.

then again, others have argued that if you expect two
mobile routers which were part of the same Mobile
Network (but not nested, both have uplinks) to move
away and split the mobile network into two, it is
stupid to assign the same MNP to both. each MR should
be delegated a unique MNP.

on top of everything we dont have a clear definition
of what it means when two Mobile Networks merge or split.
(we are _not_ talking about nesting here). this is
almost MANET space.

did I miss something?

Vijay

ps: I created an issue for this. issue 37 at
http://people.nokia.net/vijayd/nemo/issues.html