Troubleshooting OpenVPN : get the solutions you need to troubleshoot any issue you may face to keep your OpenVPN up and running / Eric F. Crist.

Format:

Book

Author/Creator:

Crist, Eric F., author.

Language:

English

Subjects (All):

Business enterprises--Computer networks--Security measures.

Business enterprises.

Physical Description:

1 online resource (170 pages)

Edition:

1st edition

Place of Publication:

Birmingham, [England] ; Mumbai, [India] : Packt, 2017.

System Details:

text file

Biography/History:

F Crist Eric: 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.

Summary:

Get the solutions you need to troubleshoot any issue you may face to keep your OpenVPN up and running About This Book This is the first book on the market that resolves your issues related to troubleshooting OpenVPN Ensure your organization's private network is protected 24x7 by resolving OpenVPN issues instantly Save time and costs by troubleshooting to reduce the impact on your business Who This Book Is For The book is for system administrators who are experienced and well versed with OpenVPN. You should possess intermediate to master level proficiency with OpenVPN. All OpenVPN users can leverage this book. What You Will Learn Diagnose and remediate authentication and authorization problems in OpenVPN Overcome simple network and startup script errors Learn OpenVPN log file format and verbosity options Resolve operating system-specific errors Discover various troubleshooting techniques to resolve problems in OpenVPN Improve performance and identify bottlenecks in the network or with hardware Determine external versus internal network issues In Detail 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. Style and approach This is a practical and straight-to-the point book that troubleshoots all the issues related to OpenVPN and provides best practices, tips, and tricks.

Contents:

Cover

Copyright

Credits

About the Author

About the Reviewer

www.PacktPub.com

Customer Feedback

Table of Contents

Preface

Chapter 1: Troubleshooting Basics

A recommended toolkit

Log search and filtering

grep

less, more, and most

Regular expressions

Network sniffing and analysis

tcpdump

traceroute

mtr

ping

Wireshark

X.509 verification and inspection

OpenSSL

Troubleshooting basics

Summary

Chapter 2: Common Problems

Narrowing the focus

Sample scenarios

Scenario 1-unable to access VPN

Scenario 2-cannot access external web when on VPN

Suspecting recent changes

Supported operating systems

Embedded devices

Semi-embedded systems

Virtual servers

IP addresses

Firewalls

Duplicate client certificates

Overcomplication

Chapter 3: Installing OpenVPN

Common installation problems

Compiling OpenVPN

Packages and installers

The advantages of precompiled installers

Driver installation

Alternative clients

Chapter 4: The Log File

Logging options

Logging levels

Verbosity 0

Verbosity 1

Verbosity 4

Verbosity 7

Common log messages

Startup messages

Version and compile string

Option warnings

Configuration parameters

Operational messages

Certificate messages

Chapter 5: Client and Server Startup

File and process permissions

Privilege de-escalation

Networking privileges

Port assignment and use

Multiple daemons

Adapter and routing table changes

Chroot

Scripting

Up and down scripts

Connect and disconnect scripts

UDP troubleshooting

UDP and firewalls

Chapter 6: Certificates and Authentication

File permissions

Pre-shared keys

Certificate authentication

Certificate chain overview.

The Certificate Revocation List

System date and time

Authentication and plugins

Usernames and passwords

ccd-exclusive

Chapter 7: Network and Routing

Connectivity

Inbound connection-server

Publicly addressed server

Privately addressed server with port forwarding

Outbound connection-client

Firewall filters and inspection

TLS authentication

Routing

Internal routing

External routing

Pushing routes

Routes behind clients

Kernel versus process routing

Route conflicts

Redirect gateway

General network concerns

Path MTU and MSS

Chapter 8: Performance

Networking

Rate limiting

Cryptographic performance

Library differences

Cipher and AES-NI

Result summary

Single thread

Chapter 9 : External Problems

Inspection and filtering

Obfuscation

Encryption

Geographic and source address exclusions

What can be done

Source IP address

DNS settings

Routing path performance

Useful links

Manual or man pages

Release notes

Support channels

Index.

Notes:

Includes index.

Description based on online resource; title from PDF title page (ebrary, viewed April 5, 2017).

ISBN:

9781786466938

1786466937

OCLC:

981928443