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  • Book Overview & Buying Troubleshooting OpenVPN
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Troubleshooting OpenVPN

Troubleshooting OpenVPN

By : Eric F Crist
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Troubleshooting OpenVPN

Troubleshooting OpenVPN

By: Eric F Crist
Buy this Book

Overview of this book

OpenVPN, the most widely used open source VPN package, allows you to create a secure network across systems, keeping your private data secure. Connectivity and other issues are a pain to deal with, especially if they are impacting your business. This book will help you resolve the issues faced by OpenVPN users and teach the techniques on how to troubleshoot it like a true expert. This book is a one stop solution for troubleshooting any issue related to OpenVPN. We will start by introducing you to troubleshooting techniques such as Packet Sniffing, Log Parsing, and OpenSSL. You will see how to overcome operating system specific errors. Later on, you will get to know about network and routing errors by exploring the concepts of IPv4 and IPv6 networking issues. You will discover how to overcome these issues to improve the performance of your OpenVPN deployment. By the end of the book, you will know the best practices, tips, and tricks to ensure the smooth running of your OpenVPN.
Table of Contents (10 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Lock Free Chapter
1
1. Troubleshooting Basics
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1. Troubleshooting Basics
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A recommended toolkit
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Troubleshooting basics
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Summary
2
2. Common Problems
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2. Common Problems
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Narrowing the focus
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Supported operating systems
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IP addresses
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Firewalls
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Duplicate client certificates
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Overcomplication
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Summary
3
3. Installing OpenVPN
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3. Installing OpenVPN
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Common installation problems
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Alternative clients
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Summary
4
4. The Log File
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4. The Log File
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Logging options
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Logging levels
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Common log messages
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Summary
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5. Client and Server Startup
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5. Client and Server Startup
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File and process permissions
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Scripting
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UDP troubleshooting
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Summary
6
6. Certificates and Authentication
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6. Certificates and Authentication
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File permissions
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Pre-shared keys
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Certificate authentication
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Authentication and plugins
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Summary
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7. Network and Routing
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7. Network and Routing
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Connectivity
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Firewall filters and inspection
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TLS authentication
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Routing
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General network concerns
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Summary
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8. Performance
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8. Performance
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Networking
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Cryptographic performance
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Single thread
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Summary
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9. External Problems
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9. External Problems
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Inspection and filtering
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Routing path performance
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Summary

Chapter 1. Troubleshooting Basics

Troubleshooting a failed server or client deployment can be a daunting task, particularly for a novice user. A vast number of users do not fall into the typical system administration role, and they are either hobbyists or just venturing into virtual networking and cryptography. By the end of this chapter, the tools' key to identifying and correcting problems will be illustrated, and their utility will be demonstrated.

The general concepts of troubleshooting apply not only to fixing a problematic OpenVPN client or server process but also to nearly everything encountered in day-to-day work. At its most basic level, the idea of divide and conquer is the phrase of the day. Separating components that are functional from those that are broken will quickly absolve the administrator from needless work and investigation.

The book is structured progressively, and it aims to help you find solutions quickly. This book will cover the following key topics surrounding fixing, identifying, and resolving OpenVPN problems:

  • A troubleshooting toolkit is a key to gleaning all the data needed to focus on a problem and resolve it.
  • Common OpenVPN issues are explored. Years of help supporting OpenVPN administrators on the forums and in IRC have provided a plethora of data, and the most common issues faced in the field are identified and solutions are provided.
  • The OpenVPN installation on various operating systems is covered. The best client for each operating system is identified, including mobile device options. Where to go to obtain the installers and files needed.
  • Log files are the primary source of troubleshooting data. When to use what verbosity level and how to search for the data within the log is explained.
  • Startup and shutdown of the OpenVPN process for both the client and the server can cause stress and anguish. OpenVPN packaging is explained, where to go for help is shown, and how to troubleshoot those startup routines will be demonstrated.
  • Routing and networking can be a difficult concept to comprehend. This is likely the number one area of difficulty for beginning OpenVPN administrators.
  • We will discuss performance issues and how to correct performance-related issues. Also, cipher suite, key size, compression, and routing optimization will be illustrated.
  • Finally, problems external to OpenVPN will be explored. Such things include local LAN address collisions and incorrect firewall filtering, both locally and at an ISP.
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