Compression of AH/NULL-ESP headers in ROHCv1

Hi All,

I would like to know how to compress AH/NULL ESP header using list compression in ROHCv1.

Please clarify me if my understanding is wrong.


è AH (RFC 3095, 5.8.4.2)

RFC is talking about how to check whether the list is changed or not by comparing SPI value of the ref_list with

the current_list. If the list not changes, then check the relation between SN with the SN in AH header. If the relationship

is understood by the decompressor, no need to send the AH SN value otherwise send the compressed AH SN value using

UOR-2 packet with EXT-3 (by enabling Aseq bit) and send the Authentication Data for all packets based on the section 5.7

in RFC 3095.



Please clarify me the below queries.

1.       How to send the initial AH information (SPI, SN, Next Header, Payload Length) to the decompressor? On which packet?

2.       How to send the new SPI information if the list changes? On which packet?

3.       What is the uncompressed list item format? How to send that item to decompressor?





è NULL ESP (RFC 3095, 5.8.4.3)
RFC 3095, specifies the Uncompressed ESP list item in section 5.8.4.3. Also it specifies the procedure of the SN compression
as same as AH.

Please clarify me the below queries.

1.       How to send uncompressed list item to decompressor? On which packet?

Thanks for your support.

Regards,
Anil Kumar Maguluri

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