While I have only tested this with my ISP, Telekom’s Streamyx, this method works pretty much everywhere. I have entered the configuration below into my router and voila, my NAT’s open.
Xbox Live! requires the following ports to be forwarded in order to operate correctly:
- UDP 88
- TCP 3074
- UDP 3074
If you have no idea on port forwarding, you can check out PortForward.com. There are step by step instructions for tons of routers, with step by step instructions on how to enable port forwarding.
If you’re too lazy to do all the above, just add set your Xbox 360’s IP as the DMZ and you’re done. :)