Build a Flexible VPN with FreeS/WAN and Linux, Part 1

Build a Flexible VPN with FreeS/WAN and Linux, Part 1
http://networking.earthweb.com/netos/article/0,,12083_1011451,00.html
Build a Flexible VPN with FreeS/WAN and Linux, Part 2
http://networking.earthweb.com/netos/article/0,,12083_1012351,00.html