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(41 reviews)
Author: Steve Suehring
ISBN : 0672327716
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Format: PDF, EPUB
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An Internet-connected Linux machine is in a high-risk situation. Linux Firewalls, Third Edition details security steps that any sized implementation--from home use to enterprise level--might take to protect itself from potential remote attackers. As with the first two editions, this book is especially useful for its explanations of iptables, packet filtering, and firewall optimization along with some advanced concepts including customizing the Linux kernel to enhance security.The third edition, while distribution neutral, has been updated for the current Linux Kernel and provides code examples for Red Hat, SUSE, and Debian implementations. Don't miss out on the third edition of the critically acclaimed Linux Firewalls.
Direct download links available for Free Linux Firewalls
- Paperback: 552 pages
- Publisher: Novell Press; 3 edition (September 24, 2005)
- Language: English
- ISBN-10: 0672327716
- ISBN-13: 978-0672327711
- Product Dimensions: 1.1 x 5.9 x 8.9 inches
- Shipping Weight: 1.9 pounds (View shipping rates and policies)
Free Linux Firewalls
If you are a system or network administrator, then you're concerned about security. If you're concerned about security, then you will want a copy of "Linux Firewalls" handy. In spite of its title, "Linux Firewalls" is about more than just firewalling.
After introductory material about firewalls, and how packet-filtering firewalls work, Suehring and Ziegler dive into creating firewalls with iptables: Enabling services, blocking attacks, optimizing firewall rules, etc. They spend a decent amount of time looking at forwarding and NAT. They demonstrate some possible network setups of varying complexity, and show how to write iptables rules for those environments. The remaining third of the book explores other security tools, such as TCPDump, Snort, and AIDE. Kernel "enhancements" SELinux and GrSecurity are discussed briefly. If that sounds like a lot of material to cover, it is. The book weighs in at over 500 pages, but it's laid out such that it's pretty easy to get to the information you need quickly. The authors have done a good job presenting such a large amount of material in a clear, easy-to-grasp fashion. Also, the book includes links to further resources in highlighted boxes is the text, and collected in an appendix, if you need to go into greater depth on a particular topic.
The book is full of useful tips. For example,in the discussion of the LOG target, they explain the technique for extracting the iptables messages from the noise in /var/log/messages and directing them to their own log. This is a question that comes up repeatedly on the iptables mailing list. The trick is to use the "--log-level" switch and configure syslog to write items that come through with the specified log-level to a seperate log.
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