PPTP clients with a permanent IP connection to a PPTP tunnel server can use PPTP tunneling over that IP connection. For example, suppose that you are in a networked office environment and your network has a PPTP tunnel server. You can then use that PPTP server to tunnel to any private network that is connected to that PPTP server, such as the personnel department’s private network. Thus, you can create a virtual private network by using your direct LAN connection. Data sent from your PPTP client to another computer on the LAN is encrypted and secure because you are using a PPTP server to connect to the remote computer.
In the following scenario, the PPTP client uses Dial-Up Networking over a LAN connection instead of a telephone line. Only one connection to the PPTP server is required.