From owner-freebsd-net@FreeBSD.ORG  Mon Mar 12 16:47:34 2007
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Date: Mon, 12 Mar 2007 16:43:13 +0000
From: Tom Judge <tom@tomjudge.com>
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To: Alexandre Biancalana <ale@seudns.net>
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Cc: freebsd-net@freebsd.org
Subject: Re: PF route-to behavior
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Alexandre Biancalana wrote:
> Hi List,
> 
> 
> I´m doing a firewall setup using 6-STABLE + PF with two internet links 
> but I can't do the route-to rule function as I need.
> 
> 
>          (default gw)    ______
>  Link A <-----------> |int A  |
>                                  |           |
>  Link B <-----------> |int B  |
>                                  |______|
>                              FreeBSD FW
> 
> A simple thing that I need to do is test the two Internet links to know 
> if they are up or not. To do this I could ping or connect tcp ports on 
> some external ips thought each link, using nc and hping I tried do this 
> generate connections/packets from each network interface connected to 
> each link but the packets always go out by the interface indicated by 
> machines default route.
> 
> I tried to add this rules in pf to force packets out by the right 
> interface based in your source address, but this does not work, and the 
> packets generated with ip of int B are going out by int A.
> 
> pass out log on $int_a route-to ( $int_b $int_b_gw ) from $int_b to any
> pass out log on $int_b route-to ( $int_a $int_a_gw ) from $int_a to any
> 
> 
> Am I forgetting something ? Any comments ?
> 

Have you tried setting the source IP address to int B when using ping 
your tcp sessions,  this should force PF to do your source routing for you.

Hope this helps

Tom