Configuring a VPN in my CentOS server

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http://unix.stackexchange.com – My server runs CentOS 6.2. It has two network cards (eth0 and eth1). In my server I have installed CoovaChilli access controller software, that manages the LAN under it. This management is done through a tunnel that is created by CoovaChilli, and all clients from LAN connect to that tunnel. Now the problem is that I would like to create a VPN between that server and another remote client (or server). I need some help on doing this, taking in account that I'm new to the topic. I tried to follow VPN HOWTO tutorial, but it is old and some things I think are deprecated. Searching on Internet, I f (HowTos)