VPN: VPN stands for Virtual Private Network. It is a virtual network that makes use of an underlying network to create a secure connection between a computer and a network or a computer and another computer. The connection may be encrypted or require authorization (for example, CITES recommends you set up CITES VPN so that you have to type in your password every time you want to connect).
A VPN Tunnel is a VPN that connects two networks. An example of VPN tunnel use is when gamers who are on different networks want to be treated as if they are on the same LAN (Local Area Network). This works with many games that use TCP/IP. See LAN party to learn more about gaming over a LAN.
The University of Illinois makes use of VPN software to create authenticated access to university computing resources from any location including non-domain machines.
One of the ways VPN is used at GSLIS is for access to printing from non-domain machines (for example, if you have your personal laptop and want to print to a GSLIS printer from that instead of one of the LRL computers).
To learn about downloading and installing the CITES VPN, check out the CITES tutorial: http://www.cites.illinois.edu/vpn/download-install.html
To learn more about VPNs in general as well as the different types of VPNs and software used, check out these links:
VPN Technologies: Definitions and Requirements (VPN Consortium)
What is a Virtual Private Network VPN?-Webopedia
