VPN Server

HI,

I am setting up VPN server for the 1st time. The installation of Win2000 server and the configuration of VPN server went fine. I configured the VPN server as a workgroup so that it autenticates users locally (let me know if this is a bad idea). I have a domain name and static IP ready which I will configure the IP to point to my domain name (for the VPN). MY ? is if I set up a workgroup for the VPN server how can the domain name I reserved and the IP which will point to the domain name communicate with my VPN server? I can’t get it . Help me out.