IP Tables Issue on VPS

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http://serverfault.com – Running a VPS with Centos 6. If I run ifconfig, the adapter with net is named venet0:0-00 venet0:0-00 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:hidden P-t-P:hidden Bcast:hidden Mask: So I run this: iptables -t nat -A POSTROUTING -s -o venet0 -j MASQUERADE But it tells me, iptables: No chain/target/match by that name. Does anyone see the issue? I need to allow UDP/TCP traffic for OpeNVPN on many ports, 1194 included. In past usage, the above command works for me. (HowTos)