Tunngle is the best option for mp play. Download tunngle from the link below and get a free account and game with your buddies.
Posted by LeviathansWrath on Dec 4th, 2011
Tunngle is better than hamachi and gameranger combined, and it supports mods unlike gameranger. You wont have the issue of cant join network due to being full, doesnt happen. Anyone can join anyones game without connection issues at all.