Firewall/NAT

I've searched throughout the mail group and have not really found any successful configurations to allow an Xbox 360 to consider itself on an Open NAT or DMZ.  Currently I have the ports that are specified on Microsofts website which allows the console to consider itself behind a "Moderate NAT."  I realize that getting UPnP support is pretty much out of the question.  However, has anyone been able to configure a second ethernet jack (like what is present on a net4801) to allow for an Xbox or any other device on this second network jack to see the WAN, but be in a DMZ.  I don't care if it can see the LAN or not.

I understand this could be a loaded question, and I would really appreciate any help anyone can give me regarding this.

1.)   If you have multiple static IPs that you get with your Internet connection you can use the advanced NAT options to setup a 1:1 NAT.  This would allow you to keep the Xbox 360 on the LAN with all your other machines / devices.  There is a moderate risk here, in that your Xbox 360 would be open to anyone on the Internet as you will be port forwarding all TCP/UDP ports from the external IP to the internal IP.  Assuming your Xbox has a static IP, if not then go give it one or use the dynamic DHCP module to do it for you.  Then do this:
a.   Go to NAT
b.   Go to Server NAT
c.   Create an entry with one of your other external IP addresses.
d.   Go to the Outbound tab and create an entry that has your Xbox 360’s IP and the new Server Nat that you entered in the prior step.
e.   Remember to save all of this
f.   You will need to create a proxy arp setting as stated.  Click the proxy arp link in the notes or select “Proxy Arp” on the menu.  ** Remember to enable advanced outbound NAT, and you will need to create an outbound NAT rule for all your normal traffic or those machines will stop working!!!!**
g.   Go to NAT and select Outbound tab
h.   Create an entry with the internal IP of your Xbox 360 and allow it to use any protocol to any destination.  (save)
i.   Create the following rule: 
WAN TCP/UDP 1 - 65535 INTERNAL-IP (ext.: EXTERNAL-IP) 1 - 65535 Xbox360 open NAT
Save all your settings


Now go turn on the Xbox 360.  If it is using the IP that you setup in the prior steps it will now have its own NAT and have all inbound TCP/UDP ports directed to it, and have full outbound access.  Run the Xbox Live test and you will see that it is now “Open.”  No more problems.

I suggest turning off that Xbox 360 when not using it.  Although I don’t know of any current hacks for it, this could always change.