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(R) 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(R) Firewalls , you can be confident that the solutions are right at hand--so you can sleep at night!