Official IPsec Howto for Linux - This howto describes the step to take when setting up a Linux based VPN. Using a Linux L2TP/IPsec VPN server - This document gives you the background and show the steps for implementing an L2TP/IPsec based VPN using Linux, Windows and MacOSX Configuring an IPsec tunnel between Openswan and Windows - This document gives you the details how to setup a virtual private network between Linux/Openswan on one side and Microsoft Windows 2000 and XP on the other side. Information about Check Point VPN-1/FireWall-1 - This site gives valuable information about the Checkpoint VPN-1 product and its interoperability with other VPN implementations. Linux VPN Howto using SSH and PPP - This howto describes the setup of a simple VPN using ssh and ppp. OpenVPN using X.509 certificates - This document explains how to deploy a VPN using OpenVPN and OpenSSL. OpenVPN 2.0 HOWTO - This howto describes the setup of the IPsec alternative OpenVPN, which is available for Win32, MacOS X and Unix-based Operating Systems. NG FAQ - VPN with FreeS/WAN - by AERAsec - This document covers the steps and pitfalls connecting a CheckPoint NG FW-1 to a FreeSWAN Linux-Box using preshared keys and X.509 certificates. Freeswan and a Cisco PIX 501 - Creating an interoperable VPN using the free FreeSWAN/Openswan and a Cisco PIX 501. Replacing a Windows PPTP server with Linux - Replacing a Windows PPTP server with Linux PopTop. Poptop MSCHAP2 ADS - This Howto describes the steps to setup a Linux PopTop PPTP Server using MSCHAPv2. For Authentication either Radius or an Active Directory Domain controller may be used. Bruce Schneier's FAQ concerning Microsoft's PPTP Implementation - FAQ about Microsoft's PPTP Implementation. Secure Computing OpenVPN Wiki - Wiki about OpenVPN which also includes several related subjects. OpenVPN Support Forum - Support forum for OpenVPN. Firewall.cx - VPN Network Security (Routers & Firewalls) - Provides tutorials for various Cisco router and VPN setups. BestVPNz - Reviews and tests of VPN services with various tutorials.