Is it Linksys? Follow my instructions. Other? It probably has similar steps, just look for forwarding.

There have been many other posts about this! Use the search feature! But I'll give you a summary anyways:

1. Go to http://192.168.1.1 in your web browser.
2. Type in the admin password that your router is set up with.
3. At the top, choose "Advanced".
4. At the top, go to "Forwarding".
5. On one empty line, enter in ports 10052 to 10054 to forward to the IP address of the computer you play JJ2 on.
6. Click the "Apply" button at the bottom.

Easy! If you need more help search for "port", "firewall", and "router" using the JCF search.

(hehe...I just copied that from my other post)

Look at this image too; it should look like this:



That image is from firmware version 1.36; if you have later (I recently updated mine to the latest), select "Both" in the TCP\UDP\BOTH box.

BTW, that image is hosted on my computer so you can only see it during the day.