OpenVPN is a tried and true VPN solution. It's totally secure and infinitely configurable. You can install and run this software without relying on a third party, but the fact that it’s open source and free is what really makes it stand out. OpenVPN can be a little daunting to configure the first time you jump into it, but once you get your configuration worked out, it’s a pleasure to use. After you have the software running on your network, it’s possible to seamlessly perform a great number of tasks. One of the most popular and practical uses for OpenVPN is its ability to enable secure surfing and home network access—whether you're out traveling or you're on an open wifi access point. It can also be used to connect separate remote networks together into one large network that is fully routable. As you can see, there’s really no limit to what you can do with OpenVPN.
For the purposes of this article, I'm going to demonstrate how to set up OpenVPN on a typical home network. The following configuration will give your client PCs secure internet access anywhere—as well as full access to your home network. The information contained in this tutorial will be aimed at Windows users who have a router that has capabilities similar to the Linksys WRT54G.
First, download the install file from http://openvpn.se/download.html (the file is called openvpn-2.0.5-gui-1.0.3-install.exe). This is the GUI version of OpenVPN. It’s basically good ole OpenVPN with a minimal graphic interface that is accessible from the system tray.
Install this file on the computer that's going to be your OpenVPN server first. The computer you choose to use should be turned on and running OpenVPN whenever you wish to have your virtual network accessible.
If you have any previous versions of OpenVPN installed, you should shut down any running instance of it before running the install file.
Next, run the install program. During the installation you can choose whether the GUI program is started automatically at system startup. (The default is yes.) I recommend leaving all of the options on the default, and, as a result, all of the following instructions assume that you have installed the program in the default directory. Remember, at the end of the install you will need to reboot the machine.