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OpenVPN 2 Cookbook

You're reading from   OpenVPN 2 Cookbook Everything you need to know to master the intricacies of OpenVPN 2 is contained in this cookbook. Packed with recipes, tips, and tricks, it's the perfect companion for anybody wanting to build a secure virtual private network.

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Product type Paperback
Published in Feb 2011
Publisher Packt
ISBN-13 9781849510103
Length 356 pages
Edition Edition
Tools
Concepts
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Toc

Table of Contents (19) Chapters Close

OpenVPN 2 Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Point-to-Point Networks FREE CHAPTER 2. Client-server IP-only Networks 3. Client-server Ethernet-style Networks 4. PKI, Certificates, and OpenSSL 5. Two-factor Authentication with PKCS#11 6. Scripting and Plugins 7. Troubleshooting OpenVPN: Configurations 8. Troubleshooting OpenVPN: Routing 9. Performance Tuning 10. OS Integration 11. Advanced Configuration 12. New Features of OpenVPN 2.1 and 2.2 Index

Optimizing performance using 'ping'


In this recipe, we will use the low-level ping command to determine the optimal Maximum Transfer Unit (MTU) size for our OpenVPN setup. Finding the right MTU size can have a tremendous impact on performance, especially, when using satellite links, or even some cable/ADSL providers. Especially, broadband connections using the PPPoE (PPP over Ethernet) protocol often have a non-standard MTU size. In a regular LAN setup, it is hardly ever required to optimize the MTU size, as OpenVPN's default settings are close to optimal.

Getting ready

Make sure the client and the server computers are connected over a network. For this recipe, the server computer was running CentOS 5 Linux. The client was running Fedora 13 Linux, but instructions for a Windows client are given as well.

How to do it...

  1. We first verify that we can reach the server from the client:

    [client]$ ping –c 2 <openvpn-server-ip>
    

    This will send two ICMP ping packets to the server and two replies...

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