Re: 6MAN WG Call for adoption draft-gont-6man-oversized-header-chain-02

Fernando Gont <fgont@si6networks.com> Thu, 28 June 2012 12:00 UTC

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Date: Thu, 28 Jun 2012 04:46:33 +0200
From: Fernando Gont <fgont@si6networks.com>
Organization: SI6 Networks
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To: Suresh Krishnan <suresh.krishnan@ericsson.com>
Subject: Re: 6MAN WG Call for adoption draft-gont-6man-oversized-header-chain-02
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On 06/27/2012 10:34 PM, Suresh Krishnan wrote:
> 
> I read through the draft and I am generally supportive of the sentiment
> behind the draft. But the draft itself is not at all clear on what
> constitutes a "entire IPv6 header chain". Without this, I think the
> draft in its current form is not actionable. 

I simply disagree. While I have no objection with including "a crisper
definition of what 'entire IPv6 header chain'", I think claiming that
"the draft in current for is not actionable" is taking it way too far.
For instance, a bunch of people clearly understood what the document is
talking about -- with the entire IPv6 header chain being all headers
from the fixed IPv6 header chain, till the upper layer protocol (TCP,
UDP, etc. -- assuming there's one of those), including any extension
headers.



> I would like a crisper
> definition of what exactly is the expected behavior on sending,
> receiving and intermediate nodes

Essentially, what is important is the sending behaviour: You must
include the entire IPv6 header chain in the first fragment. Intermediate
nodes may simply forward non-compliant packets, but may also decide to
drop them -- ditto for end nodes.

(We might want to require *end-nodes* to drop them.. However, it
wouldn't make sense to require intermediate nodes to drop such packets,
since it would implicitly require them to process the entire IPv6 header
chain).

Thanks,
-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492