I have drug out my old favorite- Baldur's Gate. I can play peer to peer if I connect over a gateway to gateway VPN, but two computers sitting on the same network don't work. VIA VPN the distant computer can join a game with either of the computers on my LAN and vice versa. However my two computers refuse to talk to each other.
I have set exceptions on windows FW.
I have turned off windows FW.
Both LAN PC's are connected via switching ports on a ZyXEL VPN gateway.
I have tried connecting them via a simple switch, no good.
Both PC's can ping each other no problem. Both PC's are set by DHCP to talk on the same subnet. No conflicting IP's.