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From: Julian Elischer <julian@elischer.org>
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Cc: ipfw@freebsd.org
Subject: Re: ipfw with nat - allowing by MAC address
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Patrick Tracanelli wrote:
>> the trick is to remmeber that "check-state" just re-runs the rule that
>> had the orginal keep-state, and that that rule can be almost anything, 
>> including
>> a skipto.
> 
> What if it is a FWD?

true too..
though fwd will do nothing in Layer2

use skipto  to simulate what you want to do.