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Virtual Private Networks - 5 : VPN Basics

The Internet is arguably the greatest tool for communication the world has ever seen. It is accessible to almost everyone, in many cases use of it is free or very inexpensive, and its potential to deliver information is unlimited. Because of all these advantages, more and more individuals and corporations see the Internet as the perfect communication medium to replace the existing analog phone system. The only real drawback to the Internet is that it is a public system, and so it does not guarantee security for any of the communication across it. Virtual private networks are designed to solve that problem. A VPN allows individuals or corporations to establish a secure connection across the Internet by encrypting the data going in at one end, then decrypting it at the other end. Encryption protects the data as it travels across the Internet. While this pretty much explains what a VPN is, it is also important to explain what a VPN is not. It is not a firewall, as it does not have the ability to examine the content of packets. Firewalls look at all data coming from the Internet and determine what may pass through. VPNs simply encrypt and forward information from one end of the VPN to the other; they do not decide which traffic is allowed to pass through, the way a firewall does.