Book Image

OpenVPN Cookbook - Second Edition

By : Jan Just Keijser
Book Image

OpenVPN Cookbook - Second Edition

By: Jan Just Keijser

Overview of this book

OpenVPN provides an extensible VPN framework that has been designed to ease site-specific customization, such as providing the capability to distribute a customized installation package to clients, and supporting alternative authentication methods via OpenVPN’s plugin module interface. This book provides you with many different recipes to help you set up, monitor, and troubleshoot an OpenVPN network. You will learn to configure a scalable, load-balanced VPN server farm that can handle thousands of dynamic connections from incoming VPN clients. You will also get to grips with the encryption, authentication, security, extensibility, and certifications features of OpenSSL. You will also get an understanding of IPv6 support and will get a demonstration of how to establish a connection via IPv64. This book will explore all the advanced features of OpenVPN and even some undocumented options, covering all the common network setups such as point-to-point networks and multi-client TUN-style and TAP-style networks. Finally, you will learn to manage, secure, and troubleshoot your virtual private networks using OpenVPN 2.4.
Table of Contents (17 chapters)
OpenVPN Cookbook - Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Handing out the public IPs


With the topology subnet feature that OpenVPN offers, it becomes feasible to hand out public IP addresses to connecting clients. For this recipe, we will show how such a setup can be realized. We will re-use a technique from the Proxy-ARP recipe from Chapter 2Client-server IP-only Networks, to make the VPN clients appear as if they are a part of the remote network. If a dedicated IP address block is available for the VPN clients, then this is not required. The advantage of using the proxy-arp method is that it allows us to use only part of an expensive public IP address block.

Getting ready

For this recipe, the server computer was running CentOS 6 Linux and OpenVPN 2.3.12. The client computer was running Windows 7 64 bit and OpenVPN 2.3.11. Keep the client configuration file, basic-udp-client.ovpn, from the Using an ifconfig-pool block recipe from Chapter 2Client-Server IP-Only Networks.

To test this recipe, a public IP address block of 16 addresses was used,...