The following configuration has been tested with MechWarior3 thoroughly on MSN Gaming Zone. Only one machine can access MSN at a time.
Protocol: TCP
Listen IP: "unspecified"
Listen port: range 2300 to 2400
Destination IP: the local IP address of the machine you want to connect to MSN
Destination port: range 2300 to 2400
Protocol: UDP
Listen IP: "unspecified"
Listen port: range 28800 to 28912
Destination IP: the local IP address of the machine you want to connect to MSN
Destination port: range 28800 to 28912