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Re: ROHC and IpSec


Perhaps there is something I am missing  but tunnel mode does not solve the problem.  Even if I can then compress the IP header, I have to put another one back on in order to make the tunnel function, and this thus eliminates the benefit.

 From: Didier Barvaux <didier.barvaux@xxxxxxxxxxxxxxxxxxxx>
To: ROHC Library <rohc@xxxxxxxxxxxxxxxxxxx> 
Sent: Monday, August 5, 2013 10:39 AM
Subject: Re: [Rohc] ROHC and IpSec


> The problem with your 1 scenario is that you can not use ROHC on the
> full ip udp rtp header because you need the IP header intact for ip
> sec to function properly.  If I compress the IP portion of the header
> than IPSec can not learn the ipaddress it needs to continue to send
> the packet along.

It does not work with IPsec transport mode, but it works with tunnel
mode. See https://en.wikipedia.org/wiki/IPsec#Modes_of_operation


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