PPTP (Point-to-Point Tunneling Protocol) is the protocol used by Microsoft in both Windows NT 4.0 and Windows 2000 Server to establish VPN (Virtual Private Networking) sessions between remote clients and a central server.
There are two ways you can use PPTP with the MIH120:
If you are trying to configure situation #1, there is nothing you need to do besides having firmware version 1.11 or newer installed on the router. Simply use Dial-Up-Networking to establish a connection using the Microsoft VPN Adapter instead of your regular modem to establish a connection to the IP address of the VPN server. The connection will be established as if the router wasn't even there. This kind of support is called "pass-through", and involves no configuration on the part of the XRouter.
If you are trying to configure situation #2, please make sure you have firmware version 1.17d installed on your MIH120. Prior versions of the firmware DO NOT WORK properly. Assign your NT or W2K server a static IP address within your LAN (such as 192.168.1.2) and use the DMZ Host feature of the router to open all ports to the server. Alternatively, you could use the Virtual Server to open port 1723 to the Nt or W2K server, but some services that use other TCP/UDP ports may not be available.
Note: Please consult with Microsoft documentation (or your IT administrator) on how to set up NT or W2K for PPTP based VPN.
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