Re: Last Call: <draft-ietf-6man-rfc2460bis-08.txt> (Internet Protocol, Version 6 (IPv6) Specification) to Internet Standard

Fernando Gont <fgont@si6networks.com> Fri, 03 February 2017 19:05 UTC

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Subject: Re: Last Call: <draft-ietf-6man-rfc2460bis-08.txt> (Internet Protocol, Version 6 (IPv6) Specification) to Internet Standard
To: Brian E Carpenter <brian.e.carpenter@gmail.com>, ietf@ietf.org
References: <148599296506.18647.12389618334616420462.idtracker@ietfa.amsl.com> <30725d25-9829-bf50-23c6-9e1b757e5cba@si6networks.com> <fbd92b47-5dba-909a-c0e5-e6430141d6dc@gmail.com>
From: Fernando Gont <fgont@si6networks.com>
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On 02/02/2017 09:26 PM, Brian E Carpenter wrote:
> 
> On 02/02/2017 22:14, Fernando Gont wrote:
> ...
>> The current impossibility to parse an IPv6 header chain that includes
>> unknown Next Header values 
> 
> Wait... you're talking about parsing by intermediate systems. The destination
> node either can understand the new Next Header or transport protocol,
> or it can't. That's fine, and is the intended result.

If it can, it already knows the syntax, so what's the point of a uniform
syntax? -- it could be anything, and wouldn't change anything.




>> results in concrete implications for the
>> extensibility of the IPv6 protocol, and the deployability of new
>> transport protocols.  Namely,
>>
>>  o  New IPv6 extension headers cannot be incrementally deployed.
>>
>>  o  New transport protocols cannot be incrementally deployed.
> 
> In both cases, add "in the presence of interfering middleboxes".
> 
> This is not new. For a document moving from PS to Standard, it is
> not something we can change.
> 
> Note, I am all for coming back to this problem, after we have the
> Internet Standard in place. Maybe we can fix it or maybe we can't,
> but it's IMHO off topic here.

Ok. Makes sense.

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