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Date: Fri, 14 Jul 2006 16:09:18 -0700
From: "Jon Simola" <jsimola@gmail.com>
To: "Nejc Skoberne" <nejc@skoberne.net>
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References: <44B75A3D.5060108@skoberne.net>
Cc: freebsd-pf@freebsd.org
Subject: Re: Multihoming with route-to
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On 7/14/06, Nejc Skoberne <nejc@skoberne.net> wrote:

> pass out on $UntrustInterface route-to ($UntrustInterface2 $NextHop2) from
>   $UntrustInterface2 to any keep state
> pass out on $UntrustInterface2 route-to ($UntrustInterface $NextHop1) from
>   $UntrustInterface to any keep state
>
> I thought this would do the following: if I ping E.F.G.H from w.x.y.z (somewhere on the
> Internet), the packet goes in through $UntrustInterface2, kernel crafts the ping-reply
> packet and sends it out to default route via the $UntrustInterface - but since there is
> a route-to rule, the packet should get routed to $UntrustInterface2 and $NextHop2
> instead. Is this reasoning correct?

You need to use reply-to when a packet comes in on the second interface:
pass in on $UntrustInterface2 reply-to ($UntrustInterface2 $NextHop2) keep state

That should get you working, then apply filtering as desired.

> You can find the full pf.conf here: http://nejc.skoberne.net/pf.conf

Thanks for linking your full pf.conf, as it makes answering questions
a lot easier.

-- 
Jon