Am I overlooking something obvious? I am at my office lan behind a nat router with normal internet connectivity. I just set up a server at home with rras vpn host. I can connect to home with the windows 2000 vpn client just fine.
When I VPN in to my server with the built-in windows client from my office I lose the normal public internet connectivity I have at through my office isp connection. For example, opening nslookup from a command prompt times out finding dns servers.
More generally, with two ip connections active (nic and vpn client) what determines which one an application that tries to connect to an ip port gets?