Apple's VPN configuration tool is client only. You have to have a VPN server setup to connect to. That server can be running either L2PT over IPSEC, or PPtP (Microsoft's VPN protocol). If you are trying to go peer-to-peer, then I would recommend looking into OpenVPN.
If you are talking about MacOS X Server, then I gave up on their VPN setup tool (on documentation, no obvious), and setup a devil-linux box to be our server.