Restrict network to use specific connection - how

[gretter]

Hi all.

I have several network connections.

Cisco AnyConnect
Local Area Connection
Wireless Network Connection 3
Wireless Network Connection 4

How can I specify that I only want to access Internet with 'Cisco AnyConnect'?

The problem is that when Cisco AnyConnect fails to connect, my pc access the web using Wireless Network Connection 3. I don't want that, it has to be VPN.

Note: Cisco AnyConnect is tunneled through Wireless Network Connection 3.