Joel, > On Sep 7, 2022, at 2:35 PM, Joel Halpern <j...@joelhalpern.com> 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 ...
That is my take as well. Bob > > 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.hin...@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. >>> >> >> _______________________________________________ >> Int-area mailing list >> Int-area@ietf.org >> https://www.ietf.org/mailman/listinfo/int-area
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