VPN hardware
A virtual private network (VPN) is a private data network that makes use of tunnels to maintain privacy when communicating over a public telecommunication infrastructure, such as the Internet. The VPN allows the various locations of a company to also provide other features such as call transfer, multiway calling, and call forwarding. A virtual private network is established on top of an untrusted network such as the Internet by constructing encrypted data transmission channels. A virtual private network is typically used to connect distant offices of an organization to each other over the public Internet. Data communicated on a VPN is encrypted before being sent through the public network and decrypted at the receiving end. An additional level of security involves encrypting not only the data but also the originating and receiving network addresses. Typically, a business will organize its VPNs for a site or geographic area in a single VPN gateway. Each gateway will support many independent VPN connections from many remote systems, or remote gateways to smaller branch office networks. A virtual private network may be configured by having one node designated as the server node and a plurality of nodes designated as client nodes. Each client node is connected to the server node establishing a plurality of tunnels between the client nodes and the server node. Virtual private networks may be either hardware or software based. A hardware based system consists of a dedicated processor running any of a number of commercially available or proprietary VPN software packages that perform the necessary VPN functions, such as encryption/decryption and authentication.
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