Subject: RE: [Manet-dt] pre-edit version 1 of SMF ID for design team input

From: "Dearlove, Christopher (UK)" <[email-masked]>
Date: Fri, 07 Oct 2005 16:02:13 +0100

> Brian and I will be out tomorrow but would like to get input over the
next
> week.

Minor input, but thinking about Section 6 (gateways) the
question at the end of 6.3 is obviously important. I can't
see how we can do this without (a) coordination between
gateways and (b) comparing whole packets, or at least
hashes of the packets. Or have I missed something? For the
coordination I would immediately think proactive - so that
when there is only one gateway, we know the coordination is
trivial (done). It could be done reactively however I think.

Related to that, but going back to the top of Section 6,
there's also the issue that we presumably don't want
multipath traffic using the MANET as a transit network
(*). I don't think the "or" in point 1 is quite strong
enough to exclude this. This needs gateway coordination,
but can be done on added numbers. Now what about the
opposite case, the MANET using the Internet as a transit
network? Unnecessary (assuming a connected MANET - I would
regard a disconnected MANET as more than one MANET) and
hence a bad idea. I think it then turns into a special
case of handling the same packet arriving at two different
gateways, i.e. the 6.3 final note applies to a packet
arriving at a gateway, having been seen before either
incoming or outgoing.

(*) Actually we've suggested before now that a MANET acting
    as a transit between a fixed network (the Internet) and
    another MANET is worth considering. But transit between
    two fixed networks (or two parts of the same fixed
    network) no thanks.

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