Blocking Non-VPN traffic

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http://forums.fedoraforum.org – I run an OpenVPN client on Fed18. I would like to set up the firewall so that OpenVPN is the only "thing" which can access the Internet, and that everything else should be "forced" through the VPN. It's trivial to do this on Windows, but has historically required arcane knowledge of IPChains/Tables on Linux. I know that FirewallD is the new kid on the block, can anyone tell me if there is an easy way to set this up on Fed18? Basically, if the VPN is down, I want all traffic blocked, and if the VPN is up, I want all traffic to go via VPN. I suspect that the way to do t (HowTos)