FreeS/WAN IPSEC HOWTO Anthony Pell 1 min read Nov 29, 2004 FreeS/WAN is a Linux implementation of the IPSEC (IP security) protocols. IPSEC provides encryption and authentication services at the IP (Internet Protocol) level of the network protocol stack. FreeS/WAN IPSEC HOWTO Prev: How to setup IPsec interoperable for Linux, OpenBSD and Kame/*BSD Next: Home Network Security