From mboxrd@z Thu Jan  1 00:00:00 1970
From: Patrick McHardy <kaber@trash.net>
Subject: Re: masquerade & ipsec
Date: Wed, 05 Jul 2006 17:34:45 +0200
Message-ID: <44ABDC15.9050606@trash.net>
References: <44A6FDDE.8050805@seclark.us>
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To: Stephen.Clark@seclark.us
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Stephen Clark wrote:
> Hello,
> 
> I am running kernel 2.6.16-1.2115_FC4 - I have network that looks like
> this:
>                                           
> FreeBSD                                           FC-4
> 10.0.128.0/17 <-> 10.0.254.254-65.162.x.x ipsec tunnel
> 24.x.x.x-192.168.2.1 <-> 192.168.2.0/24
> 
> Some change recently caused masquerading to happen on my FC-4 box before
> ipsec happens
> so my packets from my 192.168.2.0/24 network have the source address
> changed to my external interface address and don't get picked up by the
> SA. If I turn off masquerading
> then ipsec works again. I didn't use to have this problem.

You can use the policy match to exclude the packets that should
be handled by IPsec from masquerading. Or simple do it by
address.