Getting internet access from remote host through VPN like you are a VPN's LAN client

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http://serverfault.com – On my server(CentOS 6.2), I have installed CoovaChilli* software. Bellow, I will present what I need to do, and put my questions: My LAN that is managed by server is The Internet IP address of that server (the WAN) is I want to make possible an Internet client, let's say with Internet IP address, to access the Internet like he is a client in my LAN( That means (one of them), when he wants to access the Internet, he needs to authenticate first. Question: Is that possible? If yes, how? (some guidelines). I need to provide me some guidelines and thoug (HowTos)