From owner-freebsd-pf@FreeBSD.ORG  Mon Oct 23 20:49:53 2006
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Date: Mon, 23 Oct 2006 18:49:35 -0200
From: "Aristeu Gil Alves Jr" <aristeu.jr@gmail.com>
To: freebsd-pf@freebsd.org
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Subject: reply-to+synproxy versus default route
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X-List-Received-Date: Mon, 23 Oct 2006 20:49:53 -0000

he reply-to is not working when it is used with synproxy.

The scenario is described bellow:

gw-isp1 e gw-isp2 are the IP from ISP 1 and 2 gateways:
/etc/pf.conf
------------------------------------
if_isp1="ed0"
if_isp2="ed1"
if_internal="ed2"
route1="( ed0 gw-isp1 )"
route2="( ed1 gw-isp2 )"

rdr on $if_isp1 proto tcp to port 25 -> 192.168.0.2 port 25
rdr on $if_isp2 proto tcp to port 25 -> 192.168.0.2 port 25

block in log all

pass in quick on $if_isp1 reply-to $rota1 proto tcp to 192.168.0.2
port 25 synproxy state
pass in quick on $if_isp2 reply-to $rota2 proto tcp to 192.168.0.2
port 25 synproxy state

pass out quick on $if_internal to 192.168.0.2 port 25 keep state

--------

The default route is ISP1 gateway.

--------

The problem is that even pf feeding the route, the reply packet obey
the route imposed by system default route.

Ex: Syn packet comes from ISP2 interface and goes out with ISP1,
resulting in comunication failure.

When I use keep state instead of synproxy state, the comunication goes
as expected.

--
Aristeu Gil Alves Jr