From owner-freebsd-net@FreeBSD.ORG  Thu Jun 14 16:42:47 2012
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Date: Thu, 14 Jun 2012 23:42:43 +0700
From: Eugene Grosbein <egrosbein@rdtc.ru>
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Subject: ip_output: NAT then IPSEC
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Hi!

How do I make FreeBSD 8-based router/NAT/security gateway
first perform NAT for outgoing packets then apply IPSEC transport mode
for plain TCP traffic?

Presently, locally originated packets are encrypted just fine
but routed and NAT-ed packet go out unencrypted.

I use ipfw nat.

Eugene Grosbein