What is a Virtual Private Network (VPN) ?
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With the increase in business operations of a company, there is need to establish a secure communication between its Branch Offices to enhance performance at a minimum cost. The cheaper and more secure way to connect LANs between Branch Offices is VPN. A VPN enables two networks (or host and a network) to communicate with each other via a third unprotected network - the Internet. The most popular practical application of this technology is to use the Internet to carry data between distant hosts or networks at a much lower cost. To keep the communication secure when it passes through the unprotected network, the packets are encapsulated in any number of ways (for example, encrypted and authenticated). A rule set that defines all this secured connection; the start and end points; the type of authentication and encryption used; the users or groups allowed to use it; is called a tunnel.
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