Virtual Private Network

Virtual Private Network
Need of Virtual Private Network:
Assume you have two offices one in Chennai and other in New York, and you need to combine both of the office into a single LAN, what should you do. You can use routers which transfers and even then it won't Simulate as a Local Area Network. But Virtual Private Network does.

Let us take office in Chennai has IP address 198.162.0.1 to 198.162.0.100 and the remaning IP address 198.162.0.101 to 220 in New York.

Let us assume 198.162.0.5 as A
198.162.0.102 as B

                  A needs some data on B,
      Can it get data from the Computer B without VPN ?
       Yes, There is a need of proxy. And more over whenever a new protocol arrives the proxy has to rewritten.

But in the case of VPN, it can directly access the Machiene as if it is present locally with any set of server and a client.

Thus when a Program in Machiene B listens with a socket, Machine A can connect to B as a client directly without any extra coding.

This integrating the LAN all the world with a VPN server is called as Virtual Private Network.

If you have some more suggestions and clarifications, please mail me