[propbeanie]

I am not too familiar with them, but my sons used to use LogMeIn Hamachi for their Minecraft games with their buddies. One person is the "server", with ports on the computer open just for the game connections. Those that want to play then use the Hamachi client app and connect to you. Some of those type of programs are "freeware", some are pay, but I am not certain which are which, and if maybe one is maybe better than another.

There is of course, some inherent "danger" in opening ports for the server, but with a good firewall, and closing the ports when not playing, you should be fine. My sons used to play SH4 with me, but alas, I scared them off by sinking them too often... lol