Re: [Roll] Intention for draft-thubert-roll-forwarding-frags

["Pascal Thubert (pthubert)" <[e-mail]>]

Hello Ines:

This is a draft that was initially at 6LoWPAN, but the WG was in flux and people at ROLL asked the authors to revive the draft so we presented it there.
It is related to ROLL in that it enables routing fragments but still it is a bit farfetched, unless ROLL recharters in that direction in the future.
We presented the work at 6lo, but there was a mitigated reception.
Carsten in particular opposed the work, and complained that it moved places, plus has doubts about the retry mechanism.

Would you wish ROLL to continue that work?

Cheers,

Pascal

From: Ines Robles [mailto:[e-mail]]
Sent: jeudi 23 janvier 2014 23:44
To: Pascal Thubert (pthubert); Jonathan Hui (johui)
Cc: Michael Richardson; roll
Subject: Intention for draft-thubert-roll-forwarding-frags


Hi Pascal and Jonathan,


Thank you very much for draft-thubert-roll-forwarding-frags-02,


Abstract:


In order to be routed, a fragmented packet must be reassembled at
  every hop of a multihop link where lower layer fragmentation occurs.
  Considering that the IPv6 minimum MTU is 1280 bytes and that an an
  802.15.4 frame can have a payload limited to 74 bytes in the worst
  case, a packet might end up fragmented into as many as 18 fragments
  at the 6LoWPAN shim layer.  If a single one of those fragments is
  lost in transmission, all fragments must be resent, further
  contributing to the congestion that might have caused the initial
  packet loss.  This draft introduces a simple protocol to forward and
  recover individual fragments that might be lost over multiple hops
  between 6LoWPAN endpoints.


We would like to know please how you see that this draft is aligned with the roll charter,

it seems that the intention is in this thread: http://www.ietf.org/mail-archive/web/roll/current/msg07784.html, is that correct? do you have some additional information for intention?


Thank you in advance,

Michael and Ines.