A small technical prob

[BlackArchon]

PC A is connected with the Internet. With it i can create or join games normally. But i want to join with PC B, which is connected via LAN with PC A, the created game from PC A. But if someone wants to join the PC A's created game, then PC B gets disconnected. Or, if someone is in the PC A's game and PC B joins, then the other players get disconnected.

Is there a way to play with internet AND LAN-Players at the same time?