[ubuntu] IPSec passthrough (iptables)

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http://ubuntuforums.org – Hello, Just made a clean install of Ubuntu 12.04 64 bit server to use as a router/firewall and misc. services. So far it is pretty basic and up and running. But I am completely stuck on what I thought was a trivial problem, but I've been unable to solve it. For some reason I can't get IPSec passthrough to work with iptables. I don't run any IPSec server, just want to be able to run IPSec clients from within the LAN to WAN. The VPN-clients connects with the remote IPSec devices, but are unable to route any traffic. When using the cheap standard home router/firewall there's no problems (Hardware)