How to block all internet traffic if not connected to specific VPN?
Solution 1:
I had a similar problem, and figured out a way using the Win 7 / Vista firewall to block traffic if the VPN disconnects. Worked perfectly for me.
See: http://practicalrambler.blogspot.com/2011/01/windows-7-firewall-how-to-always-use.html
Hope this helps!
Solution 2:
OK, I finally found "VPNCheck" and "VPN LifeGuard".