Re: [rfc5225] Positioning of IPX dynamic chain in profile 0x0104 (IP ONLY)

Hi Suneeta,

I think the dynamic chain ends with the _dynamic format of the last
extension header after the inner ip header, like ah_dynamic.
This makes sense for me.

I have two question too.

For what profile is the ipv4_regular_innermost_dynamic format?  
This format can be used for a innermost ipv4 header in a profile not
ip-only. And, additionally, there is no counterpart for ipv6 defined.

And, is there a special reason, why the field ip_version for the
udp_baseheader is static encoded in DEFAULT, but for the other
_baseheader encoding methods not?

br
Klaus

At Tue, 13 Oct 2009 04:49:47 -0700 (PDT),
Suneeta Rao wrote:
> Hi ROHCWG,
> 
> I have a doubt regarding placing of IPX dynamic chain in IP ONLY
> profile.
> 
> As per my understanding, under normal circumstances i.e.when IPX
> headers are absent, the dynamic chain shall terminate with IP
> dynamic chain as per RFC5225 ROHC-FNCOMPRESSED
> ipv4_endpoint_innermost_dynamic (for IPV4) Pg 60.
> 
> What should be behavior in presence of IPX headers (AH/GRE for IPV4
> and HOP-BY-HOP/ROUTING/DESTINATION for IPV6)?
> 
> Should the chain terminate with IP dynamic chain(as per ROHCFN named
> above) followed by IPX dynamic chain.  or Alternatively should it
> terminate in IP dynamic chain and IPX headers cannot be compressed
> in this profile.
> 
> The confusion is because the ROHCFN says "ipv4_endpoint" for
> innermost IP header in IP ONLY profile.
> 
> thanks and regards,
> Suneeta Rao