I had this same problem myself with XBOX live and after some research I get
Open Nat now.  I wrote a how to and placed it on my site, see link below.

How to Get XBOX Live working on m0n0wall
http://rcrisman.net/article/5/how-to-get-xbox-live-working-on-m0n0wall

Ryan Crisman
MIS/IT/Webmaster Manager
Ten-Tec, Inc.
1185 Dolly Parton Parkway
Sevierville TN, 37862


On Thu, Feb 4, 2010 at 8:12 AM, Mike Dent <mcdent at gmail dot com> wrote:

> On 4 February 2010 12:40, Dennis Karlsson <dennis at denniskarlsson dot com>
> wrote:
> > *1. Enable advanced outbound NAT
> I've tried that. I assume I need to create a mapping for my internal
> subnet in the section below
> where this is enabled?
>
> > **2. Disable port mapping*
> I don't have any NAT rules defined which would affect the xbox.
>
> Thanks
>
> Mike
>
>
>
> > *
> > *
> > On 2010-02-04 13:05, Mike Dent wrote:
> >>
> >> Hi,
> >> I've been using m0n0wall for several years now. Most recently I was on
> >> 1.2(something). My two lads who both use XBOX 360 reported that NAT
> >> was showing
> >> as 'moderate' from their xboxes. This usually does not cause a problem.
> >>
> >> However recently I upgraded to m0n0wall 1.3 and now NAT shows as strict?
> >>
> >> I can't see any changes in the config that may have caused this to
> happen.
> >> I realise that m0n0 does not support upnp for good reason but if I
> >> could get things working
> >> back as how it was, ie moderate nat, then I would be happy.
> >>
> >> Many thanks
> >>
> >> Mike
> >>
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> >>
> >
>
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