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Re: [Int-area] Resubmit - requesting WG Adoption draft-moskowitz-intarea-schc-ip-protocol-number

Robert Moskowitz <rgm-ietf@htt-consult.com> Wed, 07 September 2022 21:49 UTC

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Date: Wed, 07 Sep 2022 17:49:20 -0400
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To: Joel Halpern <jmh@joelhalpern.com>, Bob Hinden <bob.hinden@gmail.com>
Cc: Internet Area <int-area@ietf.org>
References: <165989448256.19592.11033809136170928822@ietfa.amsl.com> <CAF4+nEGvJEcpMWw2z=n_HO2H1wCYOn=7gCv_pKZavJMpuHO-FQ@mail.gmail.com> <CAF4+nEE2TGh74-HY=Ygp9yVphFbXCZZawBxHf4Ta+33uEP977g@mail.gmail.com> <b421494e-21e8-57ed-1aab-4009e445bc7a@htt-consult.com> <CO1PR11MB48810885F2E40649D435759AD8419@CO1PR11MB4881.namprd11.prod.outlook.com> <E6D1BCCD-A8E9-4D9F-99AD-E3A25FC0C4D2@gmail.com> <B1AA0912-9B72-45DC-A9AD-1CFC76104BFB@tzi.org> <8d777d2d-7527-9f13-bccf-e5f98574f70d@htt-consult.com> <543440B2-8530-4A9E-8801-6EEDA8459607@gmail.com> <7D4BF0BE-DD26-4655-A286-7E87E81F1CF3@tzi.org> <4485bfe7-960e-a059-4292-826064e4bc0d@htt-consult.com> <404e48fc-f56f-f64b-f2cb-6b877ec7b4a0@joelhalpern.com>
From: Robert Moskowitz <rgm-ietf@htt-consult.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/int-area/w34bHiYGAwHnYr7pzW0o94gU_yw>
Subject: Re: [Int-area] Resubmit - requesting WG Adoption draft-moskowitz-intarea-schc-ip-protocol-number
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ESP, RFC 4303 most DEFINITELY DOES have a Next Header Field.

It is just at the end of the datagram, before the ICV.


On 9/7/22 17:35, Joel Halpern wrote:
> My reading of 8200 is that an extension header MUST start with a one 
> byte "Next Header" field.  SCHC does not.  Therefore, it is a carried 
> / upper layer protocol, not an extension header.  Much like IPv6 (in 
> IPv6).  Or UDP (with carrying an application protocol or carrying some 
> routing header like GRE, LISP, ...) or ...
>
> Yours,
>
> Joel
>
> PS: I grant we are not fully consistent in this regard.  ESP does not 
> have a next-header field.  (AH does).   But if we are going to pretend 
> that some headers are extensions headers and some are not, we should 
> try to be consistent with the description in 8200 (and 2460).
>
> On 9/7/2022 4:57 PM, Robert Moskowitz wrote:
>>
>>
>> On 9/7/22 16:35, Carsten Bormann wrote:
>>> On 7. Sep 2022, at 22:04, Bob Hinden <bob.hinden@gmail.com> wrote:
>>>> To clarify my question, it only relates to if SCHC should be added 
>>>> to the IPv6 Extension Header Types registry.   I continue to think 
>>>> that adding it to the IP Protocol Number registry is fine.
>>> I believe the answer should be the same as for 142 (RFC 5858), which 
>>> is not in the list.
>>>
>>> I couldn’t find out quickly what an IPv6 Extension Header Type 
>>> is(*), so maybe that is an oversight for 142.
>>
>> From my limited understanding and which Protocols are listed as 
>> Extension Header Types and which not (other than 142), it is a 
>> Protocol that transports other Protocols.
>>
>> Though with that definition, I wonder how HIP got in the list.
>>
>> It is fun to open a can of worms!
>>
>>>
>>> Grüße, Carsten
>>>
>>> (*) An IP protocol number, apparently.
>>> But what specifically does it make an IPv6 Extension Header Type as 
>>> well?
>>> The references given in the registry don’t seem to say.
>>>
>>
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