Re: Query regarding ROHC-TCP/IP Profile

Hi Pradeep,

I must reiterate I am not an expert on 4996. In particular although I'm
obviously familiar with TCP, I don't know much about IP ID behaviour.
However, I do notice that the DEFAULT section of the formal profile
specifies static encoding as the default encoding for that field. This
means that if a packet format doesn't specify an encoding to use, it
defaults to static encoding. Please re-read RFC 4997 if you need
further explanation on default encodings.

I am only able to answer this question because I just went and looked
up the DEFAULT section in the RFC, which of course you are able to do
yourself. I hope this answer helps you, but please do look up answers
in the RFC first before posting questions to the list.

Thanks.

Regards

Raffles

pradeep shambhu wrote:

Hi ,

If IP-ID is sequential then we are going to select the compressed
sequential packet format (1-8) , because IP-ID can be compressed using
LSB encoding method and we can place it into any compressed sequential
format. But if IP-ID is random then we select compressed random packet
format (1-8). As IP-ID field is not mentioned in the compressed random
packet formats (RFC 4996), how can we send the IP-ID in such packet
formats ?

With Regards,

Pradeep

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