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Linux Firewalls: Attack Detection and Response with iptables, psad, and fwsnort

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System administrators need to stay ahead of new security vulnerabilities that leave their networks exposed every day. A firewall and an intrusion detection systems (IDS) are two important weapons in that fight, enabling you to proactively deny access and monitor network traffic for signs of an attack.

Linux Firewalls discusses the technical details of the iptables firewall and the Netfilter framework that are built into the Linux kernel, and it explains how they provide strong filtering, Network Address Translation (NAT), state tracking, and application layer inspection capabilities that rival many commercial tools. You'll learn how to deploy iptables as an IDS with psad and fwsnort and how to build a strong, passive authentication layer around iptables with fwknop.

Concrete examples illustrate concepts such as firewall log analysis and policies, passive network authentication and authorization, exploit packet traces, Snort ruleset emulation, and more with coverage of these


Passive network authentication and OS fingerprintingiptables log analysis and policiesApplication layer attack detection with the iptables string match extensionBuilding an iptables ruleset that emulates a Snort rulesetPort knocking vs. Single Packet Authorization (SPA)Tools for visualizing iptables logsPerl and C code snippets offer practical examples that will help you to maximize your deployment of Linux firewalls. If you're responsible for keeping a network secure, you'll find Linux Firewalls invaluable in your attempt to understand attacks and use iptables-along with psad and fwsnort-to detect and even prevent compromises.

336 pages, Paperback

First published September 15, 2007

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Michael Rash

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Profile Image for عَبدُالكَرِيمْ .
205 reviews3 followers
July 5, 2013
This book is one of the best books in information security. Highly recommended.

It first explains iptables (no other book explained it so well like in this book)
then psad and how they are hooked together,
next fwsnort then again how to integrate them all together in order to harden a network.

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