Are you wanting to play over a LAN with a friend or over the internet is what we need to know first to be able to help you more easy.
megaman951 at
duke3d multiplayer
a LAN
ivanrolim at
It
:idea: Read this topic of this same forum http://jonof.edgenetwork.org/forum/viewtopic.php?t=543
You just have to know the IP of every machine in our LAN (like 192.168.0.1, 192.168.0.2....), create a server and let the clients use their IPs in dukesterx main window, and join manually to your ip! :wink: