OpenVPN "kill switch"

[mikma]

dbischof90, I answered it in your topic. In case someone else is interested in the answer.

Routing question - Routing the router over LAN

I assume your WAN and VPN connections are in different firewall zones. Have you tried to reject "output" in the WAN zone? After doing that you can add traffic rules for the traffic you need, i.e. to the VPN server and maybe the DNS server if you need to look up the IP address of the VPN server.