Troubleshooting Linux Firewalls

( 1 )

Overview

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 ...

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Overview

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!

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Product Details

  • ISBN-13: 9780321227232
  • Publisher: Pearson Technology Group 2
  • Publication date: 2/9/2011
  • Pages: 386
  • Product dimensions: 7.50 (w) x 9.25 (h) x 0.80 (d)

Meet the Author

AUTHORS

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.

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Table of Contents

Ch. 1 Introduction 3
Ch. 2 Getting started 23
Ch. 3 Local firewall security 43
Ch. 4 Troubleshooting methodology 63
Ch. 5 The OSI model : start from the beginning 75
Ch. 6 Netfilter and iptables overview 93
Ch. 7 Using iptables 109
Ch. 8 A tour of our collective toolbox 151
Ch. 9 Diagnostics 169
Ch. 10 Testing your firewall rules (for security!) 189
Ch. 11 Layer 2/inline filtering 203
Ch. 12 NAT (network address translation) and IP forwarding 217
Ch. 13 General IP (layer 3/layer 4) 241
Ch. 14 SMTP (e-mail) 257
Ch. 15 Web servers (Web servers and Web proxies) 267
Ch. 16 File services (NFS and FTP) 283
Ch. 17 Instant messaging 303
Ch. 18 DNS/DHCP 321
Ch. 19 Virtual private networks 335
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Sort by: Showing 1 Customer Reviews
  • Anonymous

    Posted January 17, 2005

    not trivial to use

    Linux firewalls are attractive to many companies because of their free nature. But free does not mean easy to understand or use. It is this need to which the book is addressed. The authors show that linux comes with powerful, versatile firewall and intrusion detection utilities. But if you need a firewall, chances are you want it to work as best as possible in defending your subnet. So details of optimum usage matter. Starting from the top down, with an analysis of how to devise a network security plan, to implementing it in a secure firewall. The book talks about how to best use various tools like nmap and iptables. Your linux toolbox is your arsenal. The problem is that some tools are not the easiest to use. Not helped by the fact that most are run at the command line. The latter is desirable for maximum flexibility, especially in writing scripts that use them. The book has guidelines for best practices. The chapter on VPN is concise and accurate. But this topic is important enough in its own right that if you plan on setting one up, seriously consider getting a book devoted to it.

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