ROHCv2 Packet Formats

Hi All,

Please can anyone explain me how to compress IPv6 extension headers in 
ROHCv2?

Please clarify me whether my understanding is right or not. Also clarify 
me the below queries.

My understanding as per RFC 5225,
1. we have to consider the IPv6 extension header as a normal header and 
use irregular chain
to build in the compressed packet (Refer 6.6.1. 
baseheader_extension_headers)

2. should consider while selecting the CID. If the adding or removing of 
the extension header 
considered as a new flow and proceed.
" RFC 5225: 4.2  Improvements of ROHCv2 over RFC 3095 Profiles
IP extension header

      Profiles in RFC 3095 compress IP Extension headers using list
      compression.  ROHCv2 profiles instead treat extension headers in
      the same manner as other protocol headers, i.e., using the
      chaining mechanism; it thus assumes that extension headers are not
      added or removed during the lifetime of a context (CID), otherwise
      compression has to be restarted for this flow.
"

Queries
1. In case of sending IPv6 extension header in IRREGULAR chain, which 
format do
we need to use to build?
2. In case of change in the data field in extension header, do we need to 
send complete
extension header? if yes, on which format?

Thanks for your support.

Regards,
Anil Kumar Maguluri

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