iptables for openvpn/dd-wrt

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http://serverfault.com – I'm hoping some iptables or dd-wrt guru can help me here. I'm basically trying to configure my network with an additional wireless virtual interface so that I have a separate SSID (wl1.1) that I can use for VPN traffic via openVPN enabling me to access my vpn connection just by switching wifi network. I've a test dd-wrt router that I have configured at the moment and I'm able to connect to my openVPN server okay, however this is forwarding all traffic regardless of wireless interface over the VPN. I think I just need some iptables rules to forward all traffice from the virtual wireless inte (HowTos)