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Date: Mon, 11 Jul 2005 15:56:49 -0700
From: Avleen Vig <lists-freebsd@silverwraith.com>
To: Mario Lobo <mario.lobo@ipad.com.br>
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Cc: freebsd-hackers@freebsd.org, freebsd-questions@freebsd.org
Subject: Re: Forcing a packet through an interface (OT?)
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On Mon, Jul 11, 2005 at 04:53:25PM -0300, Mario Lobo wrote:
> Forgive me if this is off-topic.
> How could I force a packet to go out through an interface,
> despite the default route?

You have a couple of options.
Look at CARP in 5.4, that might do what you want best.
  man 4 carp

Also google for: ipfw policy routing
that is slightly different, but if you are going tests to see when a
link goes up and down, and can change your firewall rules based on that,
that would work I think.