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Microsoft Knowledge Base article Q810761 contains:

SUMMARY

The following white papers discuss Microsoft virtual private networking (VPN) technologies.

Virtual Private Networking in Windows 2000: An Overview

This white paper provides an overview of VPNs, describes their basic requirements, and discusses some of the important technologies that permit private networking over public internetworks. This document includes the following topics:
  • Tunneling Basics
  • Advanced Security Features
  • User Administration
  • Accounting, Auditing, and Alarming
To download this white paper, visit the following Microsoft Web site:

Microsoft Privacy Protected Network Access: Virtual Private Networking and Intranet Security

This white paper explains Microsoft's support of PPTP, L2TP, and IPSec. It focuses on link layer and end-to-end security and presents Microsoft's plan to implement these protocols on Windows operating systems. This document includes the following topics:
  • Protocols For Secure Network Communications
  • Microsoft's Positions on IPSEC, L2TP/IPSEC, and PPTP
  • Microsoft Support For IPSEC, L2TP/IPSEC, and PPTP
  • Platform Support For Secure Network Communications
To download this white paper, visit the following Microsoft Web site:

Windows 2000 Virtual Private Networking Scenario

This white paper describes how common VPN scenarios are configured for a fictional company, Electronic, Inc., by using the Microsoft Windows 2000 operating system. Although your network configuration may be different from those described in this white paper, you can still apply the basic concepts of virtual private networking in your network environment. This document includes the following topics:
  • Common Configuration For The VPN Server
  • VPN Remote Access For Employees
  • On-Demand Branch Office
  • Persistent Branch Office
  • Extranet For Business Partners
  • Dial-Up And VPNs With Radius Authentication
Note: The example companies, organizations, products, people, and events that the white paper describes are fictitious. No association with any real company, organization, product, person, or event is intended or should be inferred.

To obtain this white paper, visit the following Microsoft Web site:

Virtual Private Networking with Windows 2000: Deploying Remote Access VPNs

This white paper describes the various components and design choices of a deployment of remote VPN connections that use Microsoft Windows 2000 VPN servers and Windows-based VPN clients. This document includes the following topics:
  • Components of Windows 2000 Remote Access VPNs
  • Deploying PPTP-based Remote Access
  • Deploying L2TP-based Remote Access
To download this white paper, visit the following Microsoft Web site:

Virtual Private Networking with Windows 2000: Deploying Router-to-Router VPNs

This white paper describes the various components and design choices of a deployment of router-to-router VPN connections that use Windows 2000 VPN servers. It includes detailed walkthroughs to deploy Point-to-Point Tunneling Protocol (PPTP) and Layer Two Tunneling Protocol (L2TP)-based router-to-router VPNs, information about firewall configuration, and details of troubleshooting tools and common problems. This document includes the following topics:
  • Components of Windows 2000 Router-to-Router VPNs
  • Deploying a PPTP-based Router-to-Router VPN Connection
  • Deploying an L2TP-based Router-to-Router VPN Connection
To download this white paper, visit the following Microsoft Web site: