Based On The Ipsec Virtual Private Network Applications

IPSec is the new secure standards framework of Internet, which provides the security for the IP packages delivery of Internet. In the paper, we discuss the work principle of VPN, some techniques of the VPN realization, and the comparison for realizing technique, which proofs IPSec realizing the advantage of VPN. It introduces the security system construction and the function of IPSec, and discusses the realization of the SA function, the Security Policy Database (SPD), the Security Association Database (SAD). Introduce how to handle the IP package sending out and entering in the IPSec realization. Analyze the function, constitution and work process of IKE protocols in the IPSec system. Give out the news format in the process of born security alliance (SA) and the confidential key and its resource produced in the different period. Discuss the process of the information exchanging and the producing of confidential key at the different method. Finally, the paper introduces the application case of VPN, primarily discusses the design project of the secure net pass of VPN, the technique route and realization project. Give the procedure design and the data construction of the application systems.