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From: Nate Nielsen <nielsen-list@memberwebs.com>
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Date: Tue, 12 Jul 2005 15:46:38 +0000 (GMT)
Cc: freebsd-questions@freebsd.org
Subject: Re: Forcing a packet through an interface (OT?)
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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?

What I do for testing is:

1. Assign additional local IP aliases.
2. Use IPFW or pf to forward packets that from those IPs
    through the different NICs.
3. Ping an IP online using the '-S' argument to specify
    the source as one of the IP aliases.

Cheers,
Nate