Connection woes

[Vash]

Additional info on the problem (and some reorganization of the old info):

1) My friend and I go to RIT and connect through the school's (uber) network.
2) My friend runs Windows XP Home Edition. I run Professional.
3) My firewall is not on.
4) The lag happens when we join closed B.net games, open B.net games, as well as TCP/IP games with people not on the RIT network.
5) After a bit of testing (thanks Roland), we found that when I host an Open or TCP/IP game and someone outside the network joins, that person lags.
6) My friend and I are fine if we play games with each other.
7) My friend has no problems playing Warcraft III on B.net.
8) I have no problems playing Counterstrike (besides the fact that I'm not very good at it :P ).