I have a PPTP based VPN setup on a remote machine. This machine is a Windows 2008 R2 Datacenter edition VM.
The VPN connection does not have DHCP enabled and does not have an IPv4 default gateway.
Now with that I would like to use only in the instance of a particular protocol (say Voip or Bittorent). So if traffic originates from my machine it can use its default gateway and public internet to go out and come back. But for some instances I would like this traffic to go/come_back via VPN so from an outside perspective this traffic is not from my system (assuming that eavesdropping on VPN connection is not feasible due to encryption)