Book Image

Mastering OpenVPN

By : Jan Just Keijser, Eric F Crist
Book Image

Mastering OpenVPN

By: Jan Just Keijser, Eric F Crist

Overview of this book

Security on the internet is increasingly vital to both businesses and individuals. Encrypting network traffic using Virtual Private Networks is one method to enhance security. The internet, corporate, and “free internet” networks grow more hostile every day. OpenVPN, the most widely used open source VPN package, allows you to create a secure network across these systems, keeping your private data secure. The main advantage of using OpenVPN is its portability, which allows it to be embedded into several systems. This book is an advanced guide that will help you build secure Virtual Private Networks using OpenVPN. You will begin your journey with an exploration of OpenVPN, while discussing its modes of operation, its clients, its secret keys, and their format types. You will explore PKI: its setting up and working, PAM authentication, and MTU troubleshooting. Next, client-server mode is discussed, the most commonly used deployment model, and you will learn about the two modes of operation using "tun" and "tap" devices. The book then progresses to more advanced concepts, such as deployment scenarios in tun devices which will include integration with back-end authentication, and securing your OpenVPN server using iptables, scripting, plugins, and using OpenVPN on mobile devices and networks. Finally, you will discover the strengths and weaknesses of the current OpenVPN implementation, understand the future directions of OpenVPN, and delve into the troubleshooting techniques for OpenVPN. By the end of the book, you will be able to build secure private networks across the internet and hostile networks with confidence.
Table of Contents (17 chapters)
Mastering OpenVPN
About the Authors
About the Reviewers


In this chapter, a wide variety of features and options of client/server mode with tun devices were covered. We established a basic set of configuration files for both the OpenVPN server and the client, for both the UDP and TCP protocol as means of transport, and for both Windows and Linux/Unix clients. This set of basic configuration files will be used throughout the rest of the book.

We discussed how to set up an OpenVPN server serving both IPv4 addresses and IPv6 addresses. We covered server-side and client-side routing, including redirecting all traffic over the VPN tunnel. We also saw how to hand out public IPv4 addresses using OpenVPN.

In the next chapter, we will explore the advanced features that OpenVPN offers. Also, in Chapter 6, Client/Server Mode with tap Devices, several options and examples will be explained that are useful for tun mode as well.