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OpenVPN: Building and Integrating Virtual Private Networks

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Markus Feilner

Learn how to build secure VPNs using this powerful Open Source application
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Book Details

ISBN 139781904811855
Paperback272 pages

About This Book

 
  • Learn how to install, configure, and create tunnels with OpenVPN on Linux, Windows, and MacOSX
  • Use OpenVPN with DHCP, routers, firewall, and HTTP proxy servers
  • Advanced management of security certificates

Who This Book Is For

Network administrators and any one who is interested in building secure VPNs using OpenVPN. It presumes basic knowledge of Linux, but no knowledge of VPNs is required. All basic VPN and relevant security concepts are covered.

Table of Contents

Chapter 1: VPN—Virtual Private Network
Branches Connected by Dedicated Lines
How Does a VPN Work?
VPN Concepts—Overview
Summary
Chapter 2: VPN Security
VPN Security
Privacy—Encrypting the Traffic
SSL/TLS Security
Summary
Chapter 3: OpenVPN
Advantages of OpenVPN
History of OpenVPN
Networking with OpenVPN
OpenVPN Compared to IPsec VPN
Sources for Help and Documentation
The Project Community
Summary
Chapter 4: Installing OpenVPN
Prerequisites
Obtaining the Software
Installing OpenVPN on Windows
Installing OpenVPN on Mac OS X (Tunnelblick)
Installing OpenVPN on SuSE Linux
Installing OpenVPN on Redhat Fedora Using yum
Installing OpenVPN on RPM-Based Systems
Installing OpenVPN on Debian
Installing OpenVPN on FreeBSD
Troubleshooting—Advanced Installation Methods
Internet Links, Installation Guidelines, and Help
Summary
Chapter 5: Configuring an OpenVPN Server—The First Tunnel
OpenVPN on Microsoft Windows
Connecting Windows and Linux
Troubleshooting Firewall Issues
Summary
Chapter 6: Setting Up OpenVPN with X509 Certificates
Creating Certificates
Certificate Generation on Windows XP with easy-rsa
Distributing the Files to the VPN Partners
Configuring OpenVPN to Use Certificates
Using easy-rsa on Linux
Troubleshooting
Summary
Chapter 7: The Command openvpn and its Configuration File
Syntax of openvpn
Using OpenVPN at the Command Line
Configuring OpenVPN with Certificates—Simple TLS Mode
Overview of OpenVPN Parameters
Important Windows-Specific Options
Summary
Chapter 8: Securing OpenVPN Tunnels and Servers
Securing and Stabilizing OpenVPN
Linux and Firewalls
Configuring the Windows Firewall for OpenVPN
Summary
Chapter 9: Advanced Certificate Management
Certificate Management and Security
Installing xca
Using xca
Using TinyCA2 to Manage Certificates
Summary
Chapter 10: Advanced OpenVPN Configuration
Tunneling a Proxy Server and Protecting the Proxy
Scripting OpenVPN—An Overview
Using Authentication Methods
Using a Client Configuration Directory with Per-Client Configurations
Individual Firewall Rules for Connecting Clients
Distributed Compilation through VPN Tunnels with distcc
Ethernet Bridging with OpenVPN
Automatic Installation for Windows Clients
Summary
Chapter 11: Troubleshooting and Monitoring
Testing the Network Connectivity
Checking Interfaces, Routing, and Connectivity on the VPN Servers
Debugging with tcpdump and IPTraf
Using OpenVPN Protocol and Status Files for Debugging
Scanning Servers with Nmap
Monitoring Tools
Hints to Other Tools
Summary

What You Will Learn

Chapter 1 looks at what VPNs are, how they evolved during the last decade, why it is necessary to modern enterprises, how typical VPNs work. The chapter also covers some essential networking concepts.

Chapter 2 explains VPN security issues, including symmetric and asymmetric encryption, the SSL/TLS library, and SSL certificates.

Chapter 3 introduces OpenVPN. In this chapter, we learn about the history of OpenVPN, how OpenVPN works, and how OpenVPN compares to IPSec VPN applications.

Chapter 4 covers installing OpenVPN on both Windows, the Mac, Linux, and FreeBSD. It covers the installation on Linux from the source code and RPM packages. Installation on Suse and Debian is covered in detail.

In Chapter 5, an encryption key for OpenVPN is created and it is then used to setup up our first OpenVPN Tunnel between two windows systems in the same network. The key is then copied on a Linux system and this system is connected through a tunnel to the first windows machine.

Chapter 6 shows how to create x509 server and client certificates for use with OpenVPN. easy-rsa which comes with OpenVPN and is available for both Windows and Linux is used.

Chapter 7 reviews the syntax of the command line tool openvpn, which enables building tunnels quickly. The configuration options of openvpn are covered in detail with examples.

Chapter 8 shows how to make the example tunnels created earlier safer and persistent by choosing a reliable combination of configuration file parameters. It then covers how to configure firewalls on Linux and Windows to work with OpenVPN.

Chapter 9 focuses on using xca, the advanced Windows tool with which x509 certificates can be easily managed. Its Linux equivalent, Tinyca2, which can even manage multiple certificate authorities, is also covered.

Chapter 10 covers advanced OpenVPN configurations, including Tunneling through a proxy server, pushing routing commands to clients, pushing and setting the default route through a tunnel, Distributed compilation through VPN tunnels with distcc, and OpenVPN scripting.

Chapter 11 shows how to debug and monitor VPN tunnels. It covers standard networking tools that can be used for scanning and testing the connectivity of a VPN server.

In Detail

OpenVPN is a powerful, open source SSL VPN application. It can secure site-to-site connections, WiFi and enterprise-scale remote connections. While being a full-featured VPN solution, OpenVPN is easy to use and does not suffer from the complexity that characterizes other IPSec VPN implementations. It uses the secure and stable TLS/SSL mechanisms for authentication and encryption.

This book is an easy introduction to this popular VPN application. After introducing the basics of security and VPN, the book moves on to cover using OpenVPN, from installing it on various platforms, through configuring basic tunnels, to more advanced features, such as using the application with firewalls, routers, proxy servers, and OpenVPN scripting.

While providing only necessary theoretical background, the book takes a practical approach, presenting plenty of examples.

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