ABSTRACT
A customary requirement for any multi-site network implementation is to have private communication channels between sites. The use of a dedicated leased line for the private connection is an obvious choice. Despite its security and performance advantages, this solution tends to be costly compared to the use of the Internet Protocol Security Virtual Private Network (IPsec VPN). The IPsec VPN is a private connection that provides a secure connection over a public or shared medium such as the Internet between two Local Area Networks (LANs) or a remote user and a LAN. Cryptographic techniques and protocols are employed to protect the privacy of traffic that flows between the VPN endpoints. The use of IPsec VPN for ensuring data privacy is an attractive solution because it uses the existing networking infrastructure that enables the Internet.
