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I would use port forwarding but I have two xbox 360s that connect and there are no alternate ports that I can use for my second xbox. If I use port forwarding I can have one box with an open nat and one with intermediate or strict. This is where the upnp service comes in handy for me because it somehow picks alternate ports for the second box and then it gets to have an open nat like the first xbox. I've tried writing down those alternate ports to see if I used the same ports and same tcp and udp settings without upnp and it doesn't work with upnp off for some reason. So my other issue is that I did some research on linksys routers and upnp and it turns out upnp function in these routers is not reliable. So I went with the ddwrt firmware because it is more reliable and responsive. Take for example my ip address changes on my xbox from one day to then next...with ddwrt the router will respond quicker than linksys's firmare normally would. With linksys it would still have the ports open to the old ip address and then my network needs reset. So I got to thinking...if I set an internal static ip to each of my xboxes and it could work in conjunction with upnp I would be golden. I could set one to dmz but it would be lazy and that would leave a hole in my network.

 What is the theory in setting the IP beyond the devices range?  Once more, how is it possible? Never tried it.

 So wait, you said you got online.......hmm. Using the static must have disabled a setting that you may have inadvertently changed, right? Or could you get online before the static?


 I don't see where a static would have changed the upnp settings, all that is , is to allow programs to change router settings, ie: a game, or a network utility program you might use.