Tried it. Didn't work.

Essentially, he has a Linksys router like me, but a different model. His father is stingy about getting viruses and stuff. (Well, my parents are kinda like that too, but they've slackened off a bit. Go me.) Apparently, forwarding ports on the router so that it simply connects to your computer will make your IP visible over the Internet. I don't think this is true, since it's only a very select set of ports, and unless someone is searching through the billions of computers and the tens of thousands of ports per computer for a way to get inside someone's compy, I doubt that they'll come along those three on his computer. In any case, Firefox's father doesn't want him forwarding the ports, like I said, for fear of being seen all over the Internet.

To cut it short: Is there any way to forward those three ports without them being accessible by anyone else other than JJ2 clients?

Dsaemnmsiet ,w hTeynl eyro,u 'arte laesaksitn gt ray tteoc hm aqkuee sstoimoen!