Ipsec Or Ip Security Is A Merit Protocol

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IPsec or IP Security is a merit protocol used to deliver secure data connection. The motive of the paper is to introduce VPN and IPsec with different VPN over IPsec applications.
1.1. Virtual Private Network Overview
VPN is a Virtual Private Network, a network within the original network which won’t require a separate links or communication lease lines for data transmissions. VPN uses a shared or public unsecured network to transfer the data from one end to another end through proper routing. As the transmission path is an open source security is the main concern for VPN technology. VPN is more flexible and uses internet as a mode of network communication rather than using private lease lines. VPN are generally implemented in Intranet, Extranet, within the same company or for a remote access communication. As the demand of internet is increasing the need of a secure VPN network is also increasing. VPN technology uses data encryption or encapsulation or both. VPN uses LAN-to-LAN, PPTP (Point to Point Tunneling Protocol), L2TP (Layer 2 Tunneling Protocol) or IPsec (IP Security) VPN protocols. Of the above IPsec VPN is the most secure and the most complex to troubleshoot. [Ste1999]
VPN technology is a very secure and basic technology which is used world-wide. Different type of VPN technology functions of different types of OSI layer. Figure 1 will show how each layer of VPN technology is related to the OSI (Open System Interconnection) model. The comparison
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