DevHackersBlog

What is VPN? VPN (Virual Private Network) is a generic term used to describe a communication network that uses any combination of technologies to secure a connection tunnelled through an otherwise unsecured or untrusted network. Instead of using a dedicated connection, such as leased line, a "virtual" connection is made between geographically dispersed users and networks over a shared or public network, like the Internet. Data is transmitted as if it were passing through private connections. VPN transmits data by means of tunnelling. Before a packet is transmitted, it is encapsulated (wrapped) in a new packet, with a new header. This header provides routing information so that it can transverse a shared or public network, before it reaches its tunnel endpoint. This logical path that the encapsulated packet travel through is called a tunnel. When each packet reaches the tunnel endpoint, it is "decapsulated" and forwarded to its final destination. Both tun...