supported by a huge VPN network

A very large number of associations can be easily supported by a huge VPN network, and lots of millions can be easily supported by the Internet. So it requires a huge number of VCs which generally makes the process so weak. When every service-linktoward-partner relation is evaluated onto a VC, then the networks having C links of service will generate C(C-1)/2 VCs. Conventional IP-based Virtual Private Networks (VPNs) have been broadly employed all over the world for remote connectivity; however they are usually vulnerable by multifarious client software and complexities in handling the health position of remote clients. A lot of worms and viruses broadcast through these abandoned VPN endpoints causing destruction of the internal security of the networks. Thus with the Internet, one of the most important issue is the VPN's security, particularly for those which depend upon the publicly designed Internet used for transportation. The IP-based network (unlike ATM/frame relay or private-line services) doesn't allocate the constant logical/physical pipes to the special sites, applications or protocols. To address the Internet security, IPSec (Davis, 2001) is the latest IETF (Internet Engineering Taskforce) solution that was initially proposed for the IPv6 (Deering et al., 1998) protocol; however, it has been used in the current's IPv4 networks. Since, it describes a framework for giving a powerful security in support of network transport over the IP-based environments.