On Mon, 08 Nov 2004 23:34:42 -0500, Rick Spence
<rjspence at tampabay dot rr dot com> wrote:
> Hello,
> 
> I have a single dedicated IP coming into my monowall. I'm wanting to
> NAT the external IP to two individual internal IP's
> (172.16.0.2-172.16.0.3). This is a DMZ/Server network that I'm wanting
> port 80 to listen on both of the internal IP's NATTED to the external
> IP. How would this be done?
> 

It can't be done because it's impossible (on any/every firewall).  If
that were possible to configure, they'd both respond.  Are you wanting
round robin, or host headers, or what?  If you're looking for host
headers support, this might help. 
http://m0n0.ch/wall/docbook/thirdparty-apache-virtualhosts.html

-Chris