limit allowed ip address

From:	Marc-Henri Boisis-delavaud <marc dash henri dot boisis dash delavaud at univ dash lr dot fr>
To:	m0n0wall at lists dot m0n0 dot ch
Subject:	limit allowed ip address
Date:	Mon, 20 Jun 2005 13:45:08 +0200

Is it possible, in the next beta release to add a functionality to  
limit the captive portal allowed ip address to only one port.
Or can anyone one explain me how to build a generic-pc.img from roots  
source , like this I could do the modification.
Marc