Not sure if this is more a game question or a networking question, haven't had any response in the games section so I will try here with all you knowledgeable people
 
Does anyone know if this is possible, and how?
 
Grand Prix 4 multiplayer LAN game over VPN.
 
You cant play GP4 over the internet but it supports LAN network play. Ive got a VPN router, which all works fabulously when my mate connects to me. But when either one of us trys to host or join a network game in GP4 no sessions show.
 
We are both running XP Pro, and he has tried using an ME machine to connect to me too. We can browse each others computers in my network places etc. Thought it might be because we were on different workgroups, but making them the same didnt make any difference.
 
Does anyone have any ideas?
 
Thanks.