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Eric F Crist - Mastering OpenVPN

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Eric F Crist Mastering OpenVPN

Mastering OpenVPN: summary, description and annotation

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Master building and integrating secure private networks using OpenVPN

About This Book
  • Discover how to configure and set up a secure OpenVPN
  • Enhance user experience by using multiple authentication methods
  • Delve into better reporting, monitoring, logging, and control with OpenVPN
Who This Book Is For

If you are familiar with TCP/IP networking and general system administration, then this book is ideal for you. Some knowledge and understanding of core elements and applications related to Virtual Private Networking is assumed.

What You Will Learn
  • Identify different VPN protocols (IPSec, PPTP, OpenVPN)
  • Build your own PKI and manage certificates
  • Deploy your VPN on various devices like PCs, mobile phones, tablets, and more
  • Differentiate between the routed and bridged network
  • Enhance your VPN with monitoring and logging
  • Authenticate against third-party databases like LDAP or the Unix password file
  • Troubleshoot an OpenVPN setup that is not performing correctly
In Detail

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.

Style and approach

An easy-to-follow yet comprehensive guide to building secure Virtual Private Networks using OpenVPN. A progressively complex VPN design is developed with the help of examples. More advanced topics are covered in each chapter, with subjects grouped according to their complexity, as well as their utility.

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Mastering OpenVPN

Mastering OpenVPN

Copyright 2015 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the authors, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: August 2015

Production reference: 1260815

Published by Packt Publishing Ltd.

Livery Place

35 Livery Street

Birmingham B3 2PB, UK.

ISBN 978-1-78355-313-6

www.packtpub.com

Credits

Authors

Eric F Crist

Jan Just Keijser

Reviewers

Stefan Agner

Emmanuel Bretelle

Michael A Cossenas

Guillaume Destuynder

Commissioning Editor

Amarabha Banerjee

Acquisition Editors

Richard Brookes-Bland

Larissa Pinto

Content Development Editor

Pooja Nair

Technical Editor

Mitali Somaiya

Copy Editors

Roshni Banerjee

Rashmi Sawant

Project Coordinator

Judie Jose

Proofreader

Safis Editing

Indexer

Hemangini Bari

Graphics

Sheetal Aute

Production Coordinator

Nitesh Thakur

Cover Work

Nitesh Thakur

About the Authors

Eric F Crist is an IT professional with experience in hardware and software systems integration. With a few others, he has had a key role in building the OpenVPN community to what it is today. He works in research and development as a principal computer system specialist for St. Jude Medical. His role involves system engineering, configuration management, and cyber security analysis for products related to the Cardiovascular Ablation Technology division.

You can find him online at the Freenode and EFNet IRC networks as ecrist. He calls the Twin Cities, Minnesota, his home and lives with his wife, DeeDee, his son, Lance, and his daughter, Taylor.

Jan Just Keijser is an open source professional from Utrecht, the Netherlands. He has a wide range of experience in IT, ranging from providing user support, system administration, and systems programming to network programming. He has worked for various IT companies since 1989. He has been working mainly on Unix/Linux platforms since 1995. He was an active USENET contributor in the early 1990s.

Currently, he is employed as a senior scientific programmer in Amsterdam, the Netherlands, at Nikhef, the institute for subatomic physics from the Dutch Foundation for Fundamental Research on Matter (FOM). He is working on multi-core and many-core computing systems, grid computing, as well as smartcard applications. His open source interests include all types of virtual private networking, including IPSec, PPTP, and of course, OpenVPN. In 2004, he discovered OpenVPN and has been using it ever since.

His first book was OpenVPN 2 Cookbook , Packt Publishing .

About the Reviewers

Stefan Agner completed his bachelor's degree in information technology from the Lucerne University of Applied Sciences and Arts in 2009 and has worked in the field of embedded systems as a software engineer since then. He focuses on driver development and system programming and prefers to work with the open source software stack. Currently, he is working to upstream Linux support for the ARM-based Freescale Vybrid SoC for his employer, Toradex AG.

He describes himself as an open source enthusiast who works with Linux and other free software not only in his professional life as a software engineer, but also in his spare time. At several smaller companies, he successfully deployed and managed OpenVPN as the primary VPN solution. For his private IT infrastructure, he runs OpernWrt-powered routers, which serve as OpenVPN servers. He also likes to blog about technical stuff, such as fascinating projects and interesting problems he comes across.

Emmanuel Bretelle has 10 years of experience in devops, systems, and network administration. He has leveraged OpenVPN, its plugin capabilities, and cross-platform compatibility to help connect employees across the globe to corporate networks.

He has also developed and open sourced two OpenVPN plugins: openvpn-mysql-auth and openvpn-ldap-auth.

When not fiddling around with new technology or automating his way out, he enjoys traveling and chilling out.

Michael A Cossenas is a Linux/network administrator from Athens, Greece.

He has been working as a network security specialist for Digital Sima, a company specializing in LAN/WAN networking. He is now employed as a subcontractor for IBM Greece and manages 50 plus SUSE-based Linux servers as one of their customers.

His first experience with Linux was way back in 1998, using RedHat 5.2. Since then, he has worked on various open source projects, including Zimbra, DRBD, KVM, and Postfix.

He is also an OpenVPN forum moderator.

He works as a subcontractor for IBM Greece in the SO (Strategic Outsourcing) department.

I would like to thank my family (my wife, Froso, my son, Antony, and my daughter, Kate) for supporting me in difficult times.

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Preface

Privacy and security on the Internet and in private networks is a growing concern and is increasingly common in the news, where there are breaches of each. Virtual private networks (VPN) were created out of a need for secured communications. The most popular and widely used open source VPN software today is OpenVPN.

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