Construction of VPN gateway based on FreeS/WAN under Linux

Abstract

In this paper, first, the technology of virtual private network (VPN) is presented, and a comparison of several tunnel technology is given. Secondly the structure of IPSec protocol is introduced, and FreeS/WAN software realization IPSec protocol based Linux is made a particular analysis. At last, the VPN gateway is realized by applying FreeS/WAN soft under Linux.