Re: Updating to RFC6434 to deal with 8200-style header insertion by IPIP

Tim Chown <Tim.Chown@jisc.ac.uk> Tue, 07 November 2017 11:20 UTC

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From: Tim Chown <Tim.Chown@jisc.ac.uk>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
CC: Fernando Gont <fernando@gont.com.ar>, "C. M. Heard" <heard@pobox.com>, 6man WG <ipv6@ietf.org>, Michael Richardson <mcr+ietf@sandelman.ca>
Subject: Re: Updating to RFC6434 to deal with 8200-style header insertion by IPIP
Thread-Topic: Updating to RFC6434 to deal with 8200-style header insertion by IPIP
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Date: Tue, 7 Nov 2017 11:20:14 +0000
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Hi,

> On 6 Nov 2017, at 19:35, Brian E Carpenter <brian.e.carpenter@gmail.com>; wrote:
> 
> Hi Fernando,
> 
> On 07/11/2017 07:02, Fernando Gont wrote:
>> On 11/02/2017 04:33 PM, Brian E Carpenter wrote:
>>> On 03/11/2017 04:26, C. M. Heard wrote:
>>>> On Thu, Nov 2, 2017, Michael Richardson <mcr+ietf@sandelman.ca>; wrote:
>>>> 
>>>>> 
>>>>> C. M. Heard <heard@pobox.com>; wrote:
>>>>>> On Wed, 01 Nov 2017, Michael Richardson wrote:
>>>>>>> Yet we skip other extension headers in order to find the ULP.
>>>>> 
>>>>>> Not so. An end node that encounters an unrecognized extension header
>>>>> is
>>>>> 
>>>>> Both AH and IPIP are well known and recognized extension headers.
>>> 
>>> AH is an extension header. "IPIP" isn't. It's Protocol 41, and Protocol 41
>>> is otherwise known as IPv6. (That's why it's also called IPPROTO_IPV6).
>>> In RFC8200 terms that makes it an "upper-layer header". Strictly speaking,
>>> RFC8200 doesn't specify what to do with an unrecognized upper-layer header.
>> 
>> Based on the std, anything that is unknown is an EH. In the context of
>> RFC8200/FC2460, there's only:
>> 
>> * Known EHs
>> * Known ULP
>> * Unknown EHs
> 
> Yes, that's what the text says but I wish we'd fixed it in 8200 to
> acknowledge that there is a 4th case (Unknown ULP) and that it
> cannot be distinguished from the 3rd case. Acknowledging that is
> much better than ignoring it. I'm happy with Ole's suggestion that
> this (and the resulting ICMP 1 behaviour) should be mentioned in
> 6434bis - as a clarification, not a new invention.

This seems a reasonable approach to me.  Would you like to propose text, Brian?

> I also agree that there are enough potential issues in unexpected
> IPv6-in-IPv6 that is deserves its own draft.

I’d agree. The same with header insertion for that matter. Focus on the issues and how/if they can be mitigated and in which contexts.

Tim

> 
> Regards
>   Brian
> 
>> with the last one being the default branch :-)
>> 
>> 
> 
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