Plesk OpenVPN Traffic forward

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http://serverfault.com – i installed and configured the OpenVPN Module on Plesk. It works perfectly fine, except that i am not able to access the Internet through the VPN tunnel. The VPN gateway server sided is called "tap0" and the gateway for internet is called venet0:0 Futhermore i am just using the basic settings which i configured in Plesk: Lokale Peer-Adresse Remote-Peer-Adresse with standard openvpn port. OS is ubuntu LTS. So, how am i supposed to redirect the traffic from my vpn to the wan ? or rather, how am i supposed to configure the server iptables to let access (HowTos)