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
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