Zentyal Server : Setting up secure VPN Client

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http://serverfault.com – I have officially exhausted pretty much all my google-fu trying to set this up so asking the question here. For the record, I am a mid level rookie who has played around with servers in his spare time but have never worked with Zentyal Server. Now, I have been able to set up the server as a Gateway, with one Network card being external and the other facing the internal Network. The Internal network computers are able to access the internet without any issues. Now, what I need to do is to setup a open-vpn client on the central server so that all the data for internet access goes purely goe (HowTos)