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Re: [v6ops] Operational Implications of IPv6 Packets with Extension Headers

Ole Troan <otroan@employees.org> Sat, 19 September 2020 09:49 UTC

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From: Ole Troan <otroan@employees.org>
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Date: Sat, 19 Sep 2020 11:48:55 +0200
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Cc: Gyan Mishra <hayabusagsm@gmail.com>, IPv6 Operations <v6ops@ietf.org>
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To: Fernando Gont <fgont@si6networks.com>
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Subject: Re: [v6ops] Operational Implications of IPv6 Packets with Extension Headers
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> On 19 Sep 2020, at 09:19, Fernando Gont <fgont@si6networks.com> wrote:
> 
> Hello, Gyan,
> 
>> On 19/9/20 01:06, Gyan Mishra wrote:
>> Hi Fernando
>> In this draft can we talk add point about the catch 22 situation described in RFC 7045 excerpt below bottom of introduction:
>> I think this issue is critical to the overall issue with processing of EHs and operators filtering EHs in some cases unnecessarily.
> 
> What, specifically, would you like us to say about it?
> 
> Note: RFC6564 has not (and will not) improve the situation in this respect. Since EHs share the same namespece as "upper layer protocols", then, in order for a middlebox to know it can parse a header as in the RFC6564 format, it has to now that the corresponding "protocol number" identifies an EH (as opposed to an upper layer protocol).
> 
> RFC6564 would have been useful only if we had closed the door to the definition of new EHs with a new "protocol number", and had specified that any new EHs would share the same protocol number ("XX", to have been assigned by IANA at the time RFC6564 was published).
> 

Right, but only if the assumption that middleboxes would allow arbitrary headers in between network and transport is true.  That seems unlikely to me. 

Ole


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