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From: David Miller <davem@davemloft.net>
Subject: Re: Trouble Shooting ipsec
Date: Tue, 08 Feb 2011 11:37:08 -0800 (PST)
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From: Stephen Clark <sclark46@earthlink.net>
Date: Tue, 08 Feb 2011 14:33:17 -0500

> I'll continue investigating. It just so frustrating when the ipsec
> packets just get dropped and you have no idea why. I wish there were
> some hooks in the kernel so you could at least get some debug
> information about what is happening.

There is a tracepoint (which you can monitor using perf) which tracks
all packet drops.