content: This book gave a solid grounding in what is available and a broad idea of how to use each of the options, such as IPSec with Openswan; PPTP with PopTop, using SSH+PPP, and other more proprietary VPN methods.Some of the info is a bit dated; For example, many Linux kernels these days come standard with support for IPSec and PPTP as modules. I definitely recommend after reading this book and deciding on a VPN strategy, that you find quality web sites with more up-to-date information about how to configure your selected VPN technology on your selected Linux distribution. I chose Debian/GNU Linux myself. With this book and some updated information added to that foundation, I feel like I have a good start.