Windows XP makes it possible to natively manage small virtual private networks; this feature is particularly suitable for small business or family networks (called SOHO, for Small Office/Home Office). To set up a virtual private network, you simply need to install a remote access server (VPN server) on your local area network that can be accessed from the Internet and configure each client to enable it to connect.
Installing a VPN server in Windows XP
In our example we will assume that the machine to be used as VPN server on the local area network has two interfaces - one to the local area network (a network card for example) and one to the Internet (an ADSL connection or a cable connection for example). It will be via its Internet-connected interface that VPN clients will connect to the local area network.
To make it possible for this machine to manage virtual private networks, simply open Network Connections in the Control panel. In the now open window, double-click New connection wizard:
Then click Next:
Out of the three choices offered in the window, select "Set up an advanced connection":
On the next screen select "Accept incoming connections":
The next screen presents devices you can select for a direct connection. It is possible that no devices will be proposed. Unless you have a special need, you won't need to select one:
From the next window select "Allow virtual private connections":
A list of the system's users appears; simply select or add users authorized to connect to the VPN server:
Then select the list of protocols authorized via the VPN:
Click the Properties button associated with the TCP/IP protocol to define the IP addresses the server assigns to the client for the entire session. If the local area network the server is on does not have specific addressing you can let the server automatically determine an IP address. However, if the network has a specific addressing plan, you can define the range of addresses to be assigned:
Configuration of the VPN server is now complete; you can click the Finish button:
Finish
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