Bob, 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.
Bob > On Sep 7, 2022, at 12:46 PM, Robert Moskowitz <rgm-i...@htt-consult.com> > wrote: > > > > On 9/7/22 15:15, Carsten Bormann wrote: >> On 2022-09-07, at 18:36, Bob Hinden <bob.hin...@gmail.com> wrote: >>> Is this an IPv6 extension header? Does SCHC include a next header field >>> so it can point to a header that follows? >> If you haven’t seen RFC 5856 to 5858: This is a miniseries of documents >> where we have done the analog thing for the ROHC Robust Header Compression >> scheme that is now being proposed for the SCHC Static Context Header >> Compression scheme. > > SCHC did it the other direction, first defining SCHC and then some of us > coming up with use cases for it being the actual IP protocol. > >> The actual allocation of an Internet Protocol Number to ROHC is in Section 6 >> of RFC 5858: https://www.rfc-editor.org/rfc/rfc5858.html#section-6 >> >> IANA has allocated the value 142 to "ROHC" within the "Protocol >> Numbers" registry [PROTOCOL]. This value will be used to indicate >> that the next-level protocol header is a ROHC header. >> >> Some forms of ROHC headers contain a next header field, but mostly that >> field is compressed away as it is redundant between packets in a flow. >> >> Bob’s document is doing the equivalent to RFC 5858, now for SCHC. >> Once there is a WG adoption call, I’ll express that I am very much in favor >> of this work going forward. >> (As I have said before, I’d also like to see the equivalent IKE/IPsec >> support that RFC 5856 and RFC 5857 provide for SCHC as well. But this can >> be done on different timescales.) > > Diet-ESP is the starting point. It has to be fully SCHCed. > > DTLS is already compressed enough, but as I point out, given DTLS and SCHC, > you rarely need the UDP header content. > > Bob >
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