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Mastering OpenVPN

You're reading from Mastering OpenVPN Master building and integrating secure private networks using OpenVPN

Product type Paperback

Published in Aug 2015

Publisher Packt

ISBN-13 9781783553136

Length 364 pages

Edition 1st Edition

Tools

OpenVPN

Concepts

Networking

Authors (2):

Eric F Crist

Jan Just Keijser

View More author details

Table of Contents (12) Chapters

Preface

1. Introduction to OpenVPN FREE CHAPTER

2. Point-to-point Mode

3. PKIs and Certificates

4. Client/Server Mode with tun Devices

5. Advanced Deployment Scenarios in tun Mode

6. Client/Server Mode with tap Devices

7. Scripting and Plugins

8. Using OpenVPN on Mobile Devices and Home Routers

9. Troubleshooting and Tuning

10. Future Directions

Index

Routing and server-side routing

A VPN is only truly useful when the VPN clients have access to server-side resources. In order to access these resources, routing is needed in most cases. OpenVPN has many options to automatically set up and tear down extra routes whenever a client connects or disconnects.

It should be stated that most OpenVPN troubleshooting issues are related to routing. Setting up a VPN connection is one thing, getting network traffic to flow properly is another. This often has little to do with OpenVPN itself, but more with the routing tables and firewall rules on both client and server side.

The most common layout for accessing resources on the server-side network is depicted here:

The server-side LAN is 192.168.122.0/24. The resources that the VPN clients need to access are located on this subnet. Thus, the server needs to instruct the VPN clients that an extra route needs to be set. This is done using a push option, where the route configuration is pushed to the client...

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Authors (2)

Jan Just Keijser

Jan Just Keijser

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 was an active USENET contributor in the early 1990s and has been working mainly on Unix/Linux platforms since 1995. 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 works on multi-core and many-core computing systems and 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 by Packt Publishing in 2011, followed by Mastering OpenVPN, also by Packt Publishing, in 2015.

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Eric F Crist

Eric F Crist

Eric F Crist hails from Cottage Grove, Minnesota, and he works as a product and systems engineer for Abbott. He has a relatively wide range of professional and life experience starting from physical security and access control as a low-voltage technician into software development, system administration, and software development. Eric has been a core member of the OpenVPN community since 2008 and helps manage the open source online resources. He also wrote ssl-admin, and he is a lead for Easy-RSA, both of which help manage Certificate Authorities and chains. Eric collaborated with Jan Just Keisjer for the book, Mastering OpenVPN, in 2015, also for Packt.

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