Re: [Softwires] Checksum neutrality and L4-protocol independence

Washam Fan <washam.fan@gmail.com> Wed, 15 February 2012 13:34 UTC

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Date: Wed, 15 Feb 2012 21:34:10 +0800
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From: Washam Fan <washam.fan@gmail.com>
To: Maoke <fibrib@gmail.com>
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Cc: Softwires WG <softwires@ietf.org>
Subject: Re: [Softwires] Checksum neutrality and L4-protocol independence
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Hi Maoke,

Just one point. Please see inline.

> i don't think MAP standard have nor should have such a limitation. A
> MAP-compliant device supports UDP, TCP, DCCP, SCTP today, with the same
> logic, and will support any emerging L4 protocol in the future, again with
> the same logic. requiring L4 checksum update for any supported protocol
> makes it a stable standard, and the checksum update logic is stable for any
> protocol. in 4rd-U, however, with the R-22 (3), today it can support UDP,
> TCP, DCCP and SCTP-variant(? not sure due to lack of personal knowledge),
> while if tomorrow we have a new protocol XXXP:

Please keep in mind both MAP and 4rd-U are transition techniques, from
a long-term perspective, they might disappear before any new L4
protocol invented;)

washam