| 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 topics:
Passive network authentication and OS fingerprinting
iptables log analysis and policies
Application layer attack detection with the iptables string
match extension
Building an iptables ruleset that emulates a Snort ruleset
Port knocking vs. Single Packet Authorization (SPA)
Tools for visualizing iptables logs
Perl 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.
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Biting the hand that feeds IT 
Published by: NO STARCH PRESS