Building Linux Virtual Private Networks (VPNs) covers the most popular VPN technologies available for the Linux platform. In the early chapters the theory behind VPNs is discussed, including needs and uses. Common network and host configurations are also covered. Subsequent chapters drill down into the implementation and configuration of specific software packages. Specific, detailed instructions are included as well as troubleshooting information. This book will be an indispensable resource for anyone who wants to implement a Linux-based VPN. This book will meet the needs of anyone, from the Linux user to the experienced administrator to the security professional. --Oleg Kolesnikov