Microsoft's PPTP FAQ
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Point-to-Point-Tunneling Protocol (PPTP) is a networking technology that supports multiprotocol virtual private networks (VPN).
11.
OpenVPN 2.0 HOWTO
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This howto describes the setup of the IPsec alternative OpenVPN, which is available for Win32, MacOS X and Unix-based Operating Systems.
Poptop MSCHAP2 ADS
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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.
Using a Linux L2TP/IPsec VPN server
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This document gives you the background and show the steps for implementing an L2TP/IPsec based VPN using Linux, Windows and MacOSX
NG FAQ - VPN with FreeS/WAN - by AERAsec
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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.