Momentary drop in VPN connection - how to deal with it?

Question

VPN

I use VPN. Briefly OpenVPN.
Yes, it doesn't really matter. I have a static IP on the VPN.
Windows 8 system.
How can I make it so that when the vpn connection is disconnected for a short time, the entire Internet is blocked?
I'm just surprised - for example, you registered on a serious service that strictly monitors IP - and then once again the loss of connection with the VPN. At these moments, all traffic comes directly from the native IP. The service sees this and locates your account. It's lovely.
How the hell is such an arch-important feature not added to the openVPN client?
And how can I quickly fix this in windows 8?
Can Windows be allowed to access the Internet from only one, vpnovskogo ip?
But how to do it, easily and quickly?

Answer 1

Classic question)
1) It is recommended to register vpn in the router, they usually block traffic when the connection is broken
2) If you still need it on the destination PC, you only allow ppp traffic (or what channel protocol you have) with a firewall and only to vpn server.