I ran a lan party last summer ,6 players(playing warcraft3...and other games).I dont remember even fooling with ipx(used tcp/ip).Everyone's pc hooked up...........except 1 which turned out to have a firewall installed.Also i always found it easier to assign address to each pc rather than use auto,so i knew everone's ip address to ping when trouble shootin.I didnt have to open any ports since at the time we were useing a hub and no firewalls,but the ports for warcraft 3 are Port 6112 through 6119 TCP & UDP
Hope this info helps ya.
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