From owner-freebsd-security  Fri Dec 28 12:27:52 2001
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Date: Fri, 28 Dec 2001 21:27:33 +0100
From: Krzysztof Zaraska <kzaraska@student.uci.agh.edu.pl>
To: phils@ke7hc.net
Cc: freebsd-security@freebsd.org
Subject: ipfw with DHCP [was: Re: ipfw by MAC]
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On Fri, 28 Dec 2001 11:49:28 -0800 Phil Staub wrote:

> 
> On Thu, Dec 27, 2001 at 11:11:54PM -0800, Crist J . Clark wrote:
> > On Thu, Dec 27, 2001 at 07:02:02PM -0800, John F Cuzzola wrote:
> > > 
> > > Hi there,
> > > 
> > > Does the latest version of FreeBSD allow you to create ipfw rules
based
> > > on MAC address instead of IP?
> > 
> > No.
> 
> This sort of prompts a question I've been wondering about since the
> @Home->attbi.com transition: Has anyone addressed the issue of
> configuring a firewall with a DHCP-assigned outside IP address?
/.../

Take a look at this: 

http://www.freebsd.org/doc/en_US.ISO8859-1/articles/dialup-firewall/rules.html

This setup could be a good staring point -- the author seems to be
filtering mostly on interface basis so changing IP should not be a
problem. 

Hope it helps

Krzysztof

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