I have a machine that hosts Quickbooks for multi users, and I am also trying to use this box for PPTP vpn connection from outside the LAN. It connects and everything works but the problem is the remote access adds another RAS internal adapter, and another IP. That gives this machine 2 and causes DNS issues with hosting or accessing this box. All in all, having the two IP's is not an option for this Quickbooks setup.
Can you make this work with just the 1 IP address and not use another IP?