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Date: Mon, 12 May 2008 14:49:50 +0200
From: "Slawek Zak" <slawek.zak@gmail.com>
To: freebsd-net@freebsd.org
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Subject: PF NAT and IPSec (ESP) not working
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X-List-Received-Date: Mon, 12 May 2008 13:14:22 -0000

Hi,

I probably do something wrong, and I can't seem to get NAT in PF
working with IPSec tunnel mode.

Here's the network diagram:

(172.16.0.0/16)  internal network-- remote end of tunnel AA.AA.AA.AA
---  XX.XX.XX.XX re0  (Internet) ----- enc (IPSec) ---- ZZ.ZZ.ZZ.ZZ
gif1 --- tun0 ---  YY.YY.YY.YY/24 OpenVPN clients

I want OpenVPN clients to be NAT'ed to ZZ.ZZ.ZZ.ZZ and then enter the
ipsec tunnel, be encrypted and land on the other side.

When I've setup NAT using following PF rule:

nat pass log on enc0 inet from YY.YY.YY.YY/24 to 172.16.0.0/16 -> ZZ.ZZ.ZZ.ZZ

the packets go out on gif1 but are not encrypted (no traffic on enc0).
Same for following NAT rule:

nat pass log on enc0 inet from YY.YY.YY.YY/24 to 172.16.0.0/16 -> ZZ.ZZ.ZZ.ZZ

Help, please!

Thanks, /S