Oh, and although HIP has NH as the first byte in its header, that is NOT
for something within the HIP datagram. Rather this was a design to
allow a "Piggybacking" of something else after HIP within the IP
datagram. For example a HIP R2 packet can have a NH of ESP where the
ESP is in transport mode carrying a TCP SYN to start the TCP exchange,
thus saving one packet in the exchange.
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.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.
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