Subject: [Roll] Forwarding fragments

From: "Pascal Thubert (pthubert)" <[email-masked]>
Date: Thu, 18 Oct 2012 08:49:03 +0000

Hi:

I was asked by a number of people ( you guys ! ) at a recent IETF meeting to publish the state of the (ex 6LoWPAN) fragment forwarding draft at ROLL.

The problem is this with large IP packets: in a multiple hop mesh environment with small MTU such as classical 802.15.4, the packet must be fragmented and recomposed at each hop so it can be routed to the next hop.

Current solutions avoid either condition:
- avoid IP with mesh under
- avoid large packets with small TCP MSS
- avoid small MTU with 802.15.4G
- avoid meshing with a federating backbone ala 802.11 ESS

The draft allows to safely forward fragments over  a multihop route over network.

If you think that is desirable please shime in and I'll ask for a slot at the next meeting.

Cheers,

Pascal Thubert
IPv6 Engineering

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