From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Beverley <andy@andybev.com>
Subject: RE: IP forwarding on a linux IPSec gateway
Date: Tue, 31 Jan 2012 22:15:55 +0000
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To: "Prashant Batra (prbatra)" <prbatra@cisco.com>
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On Tue, 2012-01-31 at 23:41 +0530, Prashant Batra (prbatra) wrote:
> Any links to understand the flow in the kernel for this kind of
> forwarding with IPSec to analyze where the problem could be will be
> really helpful.

Does this excellent diagram from Jan help at all?

http://upload.wikimedia.org/wikipedia/commons/3/37/Netfilter-packet-flow.svg

Andy