I have a Netgear Wireless router and I cant get JJ2 to work, I'm not even using the wireless function for the computer JJ2 is played on, just a standard ethernet cable. I've tryed forwarding ports 10052-10054 and it doesnt seem to work, here are the options for port forwarding:
SERVICE NAME
STARTING PORT
ENDING PORT
SERVER IP ADRESS
Thats it, if you need a screenshot I can post one.

Well you're in the right section. If it doesn't work you're either entering the wrong things or the router doesn't do it properly (the latter is more likely).

Is there a section regarding "Port Triggering" or anything like that? Because on my SMC router the port forwarding doesn't work for UDP (even though it has an option UDP\TCP), but the port triggering works.

Port triggering is basically the same as port forwarding, except the port is only opened when an outgoing port is accessed. This actually works out better, because you can play JJ2 on any computer without changing the router settings.

Bah, no such thing on my router, looks like I cant play JJ2 online anymore