
Site-to-site VPN is used in connecting the networks placed at different locations using Internet. The solutions incorporated in the site-to-site VPN helps in connecting various branches or remote offices to the network headquarters wherein each site is equipped with a VPN gateway, such as a router, firewall, VPN concentrator, or security appliance. A virtual private network (VPN) consists of multiple remote peers transmitting private data securely to one another over an unsecured network, such as the Internet. In such cases, site-to-site VPN plays a vital role in secure transmission of data by using tunnels to encapsulate data packets within normal IP packets to forward over IP-based networks, and also uses encryption to ensure privacy and authentication.