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Troubleshooting Linux Firewalls [Paperback]

Michael Shinn , Scott Shinn

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Book Description

Dec 14 2004 0321227239 978-0321227232 1
While Linux firewalls are inexpensive and quite reliable, they lack the supportcomponent of their commerical counterparts. As a result, most users of Linuxfirewalls have to resort to mailing lists to solve their problems. Our authorshave scoured firewall mailing lists and have compiled a list of the most oftenencountered problems in Linux firewalling. This book takes a Chilton's manualdiagnostic approach to solving these problems.The book begins by presenting the two most common Linux firewallconfigurations and demonstrates how to implement these configurations in animperfect network environment, not in an ideal one. Then, the authors proceedto present a methodology for analyzing each problem at various network levels:cabling, hardware components, protocols, services, and applications. Theauthors include diagnostic scripts which the readers can use to analyze andsolve their particular Linux firewall problems. The reference distributions areRed Hat and SuSE (for international market).

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Product Details

Product Description

From the Back Cover

Covers Red Hat and SUSE

When something goes wrong with your Linux firewall, you need to fix it—right now. You don't have time for endless newsgroup searches, confusing man pages, emails to the developers... it's an emergency! One book brings together all the step-by-step solutions and proven problem-solving techniques you'll need when the time comes: Troubleshooting Linux® Firewalls .

Authors Michael Shinn and Scott Shinn are among the world's leading firewall experts; they've even been hired to protect computer security at the White House. In this book, they cover every area where Linux firewalls can go wrong: rules and filtering problems, Layer 2/3/4 issues, trouble with individual services, DNS/DHCP failures, even misconfigured VPNs. They also present an easy, start-to-finish troubleshooting methodology that'll help you identify even the newest or most obscure firewall problem fast—and solve it!

Inside, you will find in-depth information on the following areas:

  • What you must know about iptables and netfilter to troubleshoot and avoid problems

  • Using loggers, sniffers, and other tools to diagnose even the most obscure firewall problems

  • Making sure your firewall rules work the way they're supposed to

  • Resolving problems with Network Address Translation and IP Forwarding

  • Troubleshooting SMTP, Apache, Squid, NFS, FTP, instant messaging, and other Web-based services

  • Finding and fixing common problems with IPsec VPN configuration

  • Making your firewalls more failure-resistant: recommendations from the experts

If you depend on a Linux firewall, what will you do if it goes down? With Troubleshooting Linux® Firewalls , you can be confident that the solutions are right at hand—so you can sleep at night!

© Copyright Pearson Education. All rights reserved.

About the Author


Michael Shinn is managing partner of the Prometheus Group, an IT security consulting firm. He was formerly a member of Cisco's Advanced Network Security Research group and a senior software developer and founding member of the firm's Signatures and Exploits Development Team.

Scott Shinn co-founded Plesk, a server management firm. He was formerly a senior network security engineer specializing in penetration testing for Fortune 50 clients at Wheelgroup, a firm later acquired by Cisco.

Both authors served on the White House technology staff, specializing in security and penetration testing of both internal and Internet-connected systems.

© Copyright Pearson Education. All rights reserved.

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Amazon.com: 3.7 out of 5 stars  3 reviews
13 of 15 people found the following review helpful
5.0 out of 5 stars Best of breed April 20 2005
By Stephen Northcutt - Published on Amazon.com
The Shinn brothers are legendary in information security, so when I saw this book, I made sure to put it on the top of my airline reading list.

If you ever watch someone closely that is trying to troubleshoot a computer, network, or firewall, you quickly realize fault detection and root cause determination are skills very few people have. I watch people change two things and reboot, or try the last thing they just tried again and just shake my head.

The book is not just about troubleshooting, it includes setup, network theory, and proper design as well. However, chapter 4 should be required reading for anyone that is allowed near a computer with privileged access, windows or unix. If this book gets revised I would love to see the troubleshooting chapter expanded, that is critially important information.
4 of 4 people found the following review helpful
4.0 out of 5 stars It Delivers Aug. 24 2007
By Jeff Pike - Published on Amazon.com
Despite a number of introductory chapters, there is not much fluff in here. It provides a sound treatment of architectural issues before getting down to business with netfilter and iptables. It touches on some diagnostics techniques and tools before dealing with firewall configurations that are specific to popular services. This is a very useful book for firewall administrators. The index could be better, but I've been able to find what I needed.

Chapters in this 360 page volume include:
-Getting Started
-Local Firewall Security
-Troubleshooting Methodology
-The OSI Model
-netfilter and iptables Overview
-Using iptables
-A Tour of Our Collective Toolbox
-Testing Your Firewall Rules for Security
-Layer 2/Inline Filtering
-NAT and IP Forwarding
-General IP
-Web Services
-File Services
-Instant Messaging
0 of 1 people found the following review helpful
2.0 out of 5 stars Dead Links July 29 2012
By Patrick G. Heck - Published on Amazon.com
This book does contain a lot of good information, including a recipe for a shell script that establishes a basic firewall, and a chapter on troubleshooting. The explanations of the various parts of the script are ok, but the book is now 7 years old. Unfortunately, nearly every section in the book (including some explanations of things done in the firewall script) says "see our website for more info." That would be fine except the website no-longer exists, and the address now redirects to a commercial product. (which is why I'm not mentioning the site by name here).

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