How to Configuring a VPN in my CentOS server

How to Configuring a VPN in my CentOS server

How to Configuring a VPN in my CentOS server
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 Im 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 found that there are many ways to create a VPN - I mention just a few: IPSec, OpenVPN, CIPE - and this confused me a little bit.
What is a VPN?
VPNs (Virtual Private Networks) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia).
Why do I need a VPN?
Whether youre an expat living in a foreign country where the internet is heavily regulated, a mobile user constantly on the road, or just someone concerned with maintaining their privacy online, having aVPNis becoming essential.
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