Turning off NAT

Disabling NAT should not be necessary. Configuring "port forwarding" in the router settings is the recommended way to configure a router for gaming compatibility but another option that many routers have is DMZ hosting.

I know you are using a different brand of router but as an example here are directions from a help page available in most of the versions of the Linksys router settings...

The DMZ hosting feature allows one local user to be exposed to the Internet for use of a special-purpose service such as Internet gaming or videoconferencing. DMZ hosting forwards all the ports at the same time to one PC. The Port Forwarding feature is more secure because it only opens the ports you want to have opened, while DMZ hosting opens all the ports of one computer, exposing the computer so the Internet can see it.

Any PC whose port is being forwarded must have its DHCP client function disabled and should have a new static IP address assigned to it because its IP address may change when using the DHCP function.

1. To expose one PC, select Enable.
2. Enter the computer's IP address in the DMZ Host IP Address field.
3. Click the Save Settings button.