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 From:  "Chris Buechler" <cbuechler at gmail dot com>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] more than one public IP on m0n0-wall
 Date:  Fri, 7 Nov 2008 13:36:51 -0500
On Fri, Nov 7, 2008 at 8:02 AM, Ryan Mullins <rmullins at ciscomonkey dot net> wrote:
> Server NAT will accomplish what you want.  If you set up your external IPs
> here, then on your NAT rules, you can select the WAN Interface and select
> the external IP Address in your rule and send it to whatever server inside
> you want.
>
> I believe that you'll need to set up proxy arp for your public IPs (not
> assigned to the WAN interface) as well in m0n0, it's been a while, so I'm
> not sure if that one was necessary or not - maybe someone else can confirm
> this for us.
>

Yeah you will need proxy ARP in most scenarios. The only time you
don't is when those additional IPs are routed to your WAN IP by your
ISP, which is uncommon. Then you can use those IPs with either 1:1 NAT
or Server NAT depending on your needs.

-Chris