Virtual Private Network ( Vpn ) Technology

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Abstract: A virtual private network (VPN) technology creates an encrypted connection over a network. VPN is useful to exchange information between offices securely. VPN has advantages over traditional private networks and dedicated links. Tunneling techniques are used to implement VPN. This paper describes the various tunneling technologies like, IPSec, PPTP, GRE and L2TP used in virtual private network. It concludes by comparing these technologies and their use for given selection criteria. I. Introduction: A virtual private network enables us to send data between machines across different networks. VPN has all the characteristics of a private network. It allows only authorized users to access network related services and resources.…show more content…
The data being sent is encrypted for confidentiality. The packets over the link are indecipherable without the encryption keys. If one of the router is destroyed in the communication link it automatically rebuilds a new communication path so the communication gets rerouted through a new path. The VPN connection across the Internet logically operates as a wide area network (WAN) link between the two sides. Advantages of VPN: VPN has several advantages over the dial-up networks and leased lines. The capacity of these lines is available at all times but fixed and flexible. The traffic on these private networks belong only to the company deploying the network. There is an assured level of performance but it comes with a very high price [4]. The traditional private networks are expensive to deploy and plan. The cost is extremely high when it involves international locations. Further, the dedicated links take time to install and activate the link. Therefore, using VPN utilizes the ubiquity of the Internet and convenience for dynamic building and maintenance [3]. Moreover VPN facilitates an agile IT infrastructure. VPN also supports a mobile workforce a reliable authentication mechanism is supported by VPN to provide easy access to Internet from anywhere using available access media including analog modems, ISDN, cable modems, ISDN and DSL at significantly lower cost. Types of VPN connections: There are two types of VPN
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