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[FurryNutz]

I suppose it would depend on who's hosting. If you have 2 PCs that are playing the same game, which one will be doing the hosting and which one will be connecting as the client. Reason of setting static IPs on devices is that if the IP address changes when using DHCP, and you set an IP address in the router for say, gaming or GameFuel, that setting becomes broke if the address changes, until you correct the IP address. Using Static IP addresses prevents any change in addressing. You know that each device has it's own address that never changes.

[bryants1]

So what would you do if you have multiple computers trying to play the same computer game, just can't rely on port forwarding as an option?

For two Xboxes, you would use port triggering versus port forwarding. On the 4500, that's the same as Advanced\Special Applications.

To answer the poster's original question, port 53 is used by DNS (which all devices use), and port 80 is for http.

[Beeder]

I mean for the same game.  Say you have 2 computers and want to port forward for both of them for the same game at the same time, 2 people playing.  Can you do that hence for 2 static IP addresses?

Only UPnP can take care of this.  Port forwarding forwards ALL of the traffic for that particular port to ONE computer (IP address).  Same story for DMZ (except ALL unsolicited incoming port traffic goes to ONE address).

[vlj9r]

I enabled uPNP and I'm not having any problems with my 2 360s online at the same time.  Both 360s network configurations are set to automatic.

jr

[Trikein]

Yes, you can. Any port forwarding has to be done to a static, or atleast reserved, IP. Thats Static in the LAN, and not to be confused with a static in the WAN (from your ISP).

192.168.0.1 > Basic > Network Settings.

Scroll down to the bottom and click on the little "Edit" icon next to each IP you want to forward to. It will show up in the "Add DHCP Reserveration" box above. Name it as you wish, and pick any IP from 192.168.0.100 to 192.168.0.199 (By default). Save and then Save settings and reboot. Then

192.168.0.1 > Advanced > Gaming

Now to the right of "IP address" there should be a drop down with which ever IP addresses you "named". Just create the same forwarding rule for each device you wish.

As for why port forward is needed if you have UPnP is somewhat complicated. Think of UPnP as a traffic light, and port forwarding as a overpass. Both direct traffic, but one has the risk of delaying traffic because of the delay inherent in the system. You probably know this all too well. When traffic picks up, UPnP can be a bottleneck.