Just got a router, but am directly connected to the router, and i keep getting disconnected from WoW. Found a "Application and Gaming" tab, on my router setup. and im pretty sure its the issue.
Port Range Forwarding: Certain applications may require to open specific ports in order for it to function correctly. Examples of these applications include servers and certain online games. When a request for a certain port comes in from the Internet, the router will route the data to the computer you specify. Due to security concerns, you may want to limit port forwarding to only those ports you are using, and uncheck the Enable checkbox after you are finished.

PORT RANGE
Application:
Start:
End:
Protocol: Both/TCP/UDP
IP address: (needs last digit)
Enable:

Hi Suprisë,

PORT RANGE
Application: Any name that you'll remember. Let's call this one WoW
Start: 3724
End: 3724
Protocol: Both/TCP/UDP
IP address: (needs last digit) <- whatever Start->Run->cmd->ipconfig says for your IP address
Enable: [check mark]