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 From:  "Lee Sharp" <leesharp at hal dash pc dot org>
 To:  <m0n0wall at lists dot m0n0 dot ch>
 Subject:  Re: [m0n0wall] Help on which NAT to choose
 Date:  Thu, 9 Mar 2006 10:54:20 -0600
From: "Andrea Gangini" <a dot gangini at mimesi dot com>

> I've tested monowall in a simple configuration and I found it very 
> complete and robust; so I want to migrate the firewall (ipcop based) of 
> our company to monowall.
> However I could'nt understand how to replicate a simple ipcop feature, 
> which is that the firewall must have multiple WAN ips, each with its own 
> port forward rules. In ipcop this feature is called "network alias". The 
> internal network is NATted on a single WAN ip (all outbound requests 
> originate from the same IP).

You need 1:1 NAT and Proxy Arp.  http://192.168.1.1/firewall_nat_1to1.php 
and http://192.168.1.1/services_proxyarp.php  The first does the NAT, and 
the second allows the m0n0wall to advertise the IP address.

                        Lee