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Re: Transport Mode Q



Stephen,

>	Just had a scan of the likely documents for the definition on what
>to deal with the outer header for
>	Transport Mode - I suppose this is obvious,  but is it documented in
>the ipsec drafts?
>
>	I'm assuming, as a BITW sort of thing,  I need to move the IP
>protocol field into one of the extra
>	headers I apply, and adjust the packet length:
>
>	[IP][Upper]
>
>	[IP][AH][ESP][IPCOMP][Upper]
>
>	In this example,  IPCOMP next-head needs to copy the value from
>[IP],  and [IP] needs it's
>	next prot set to AH,  and so on.  Once compression/encryption is
>complete, I write the
>	final length into [IP] and then Authenticate.
>
>	Am I close?

Yes, this is an accurate characterization of the processing.  I guess we
did not include an explicit description because, as you said, it seemed
fairly obvious.  However, it would be preferable to include a discussion of
this in the arch doc.  I'll defer to the judgement of the WG chairs to
determine if we need to make this change at this stage in the process.

Steve




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