ok which kind of VPN are you using? pptp, IPSEC, or another, that will be helpful to those trying to assist you. secondly if your experience ends up being at all like mine you'll pull your hair out. a quick aside when I was getting a pptp vpn up it took me weeks to get a config correct for users to logon, then once that was set I was working on the routing to other machines, then all of a sudden, I can no longer logon through my internet connection from machines outside my modem, I have since moved and have anew modem and service yet am still unable to logon from outside my in-house network. But back to you. If it's a pptp connection there's some killer stuff at this place.
well god luck and if you can tell me what went wrong with my vpn I'll, well, I'll thankyou. Pleasant VPNing