http://www.openvpn.eu/index.php?id=73
http://thinkhole.org/wp/2006/03/28/ipcop-openvpn-howto/
pretty much sums it up!
Remember to run client as Administrator on Vista:
add the following to rc.local if things dont get pused down.
iptables -A INPUT -i tun+ -j ACCEPT
iptables -A FORWARD -i tun+ -j ACCEPT
iptables -A INPUT -i tap+ -j ACCEPT
iptables -A FORWARD -i tap+ -j ACCEPT
When installing Open VPN (Zerina) remove the “if” block checking for the IPCOP version – cause that will completely stop it 🙂