Virtual Private Network (VPN) function is: in the public network to establish a private network , conduct encrypted communications. In enterprise networks have a wide range of applications. VPN gateway through the data packets to achieve the conversion of encrypted data packet destination address and remote access . VPN through the server to achieve a variety of ways, hardware, software and so on.
Summary:
VPN belong to remote access technology, simply put, is to use the public network to set up a private network . For example, a company employee travel to the field, he would like access to corporate network of server resources, this access belongs to remote access. [2]
In the traditional enterprise network configuration, remote access to the traditional method is to hire DDN ( Digital Data Network ) leased line or frame relay , such communications program will inevitably lead to high network traffic and maintenance costs. For mobile users (mobile workers) and remote individual users, usually through dial-up lines ( Internet into the enterprise's) local area network , but this will inevitably bring about a safety hazard. [2]
Let the field staff access to network resources using VPN solution is to set up a network, including VPN server . After the field staff on the ground connected to the Internet, connect to the VPN server over the Internet, and then into the enterprise network through the VPN server. In order to ensure communication of data between data security, VPN server and client have carried out the encryption process. With data encryption , it can be considered secure transmission of data is on a dedicated data link, as if specially erected as a private network, but in fact VPN using a public link on the Internet, so called VPN a virtual private network, which essentially is the use of encryption on a public network package data communication tunnel. With VPN technology, users both in the field trip in the office or at home, as long as the Internet will be able to use VPN to access internal network resources, this is the VPN application in the enterprise so widely reasons.