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Linux Firewalls
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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 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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Table of Contents

ACKNOWLEDGMENTSFOREWORDINTRODUCTIONChapter 1: CARE AND FEEDING OF IPTABLESChapter 2: NETWORK LAYER ATTACKS AND DEFENSEChapter 3: TRANSPORT LAYER ATTACKS AND DEFENSEChapter 4: APPLICATION LAYER ATTACKS AND DEFENSEChapter 5: INTRODUCING PSAD: THE PORT SCAN ATTACK DETECTORChapter 6: PSAD OPERATIONS: DETECTING SUSPICIOUS TRAFFICChapter 7: ADVANCED PSAD TOPICS: FROM SIGNATURE MATCHING TO OS FINGERPRINTINGChapter 8: ACTIVE RESPONSE WITH PSADChapter 9: TRANSLATING SNORT RULES INTO IPTABLES RULESChapter 10: DEPLOYING FWSNORTChapter 11: COMBINING PSAD AND FWSNORTChapter 12: PORT KNOCKING VS. SINGLE PACKET AUTHORIZATIONChapter 13: INTRODUCING FWKNOPChapter 14: VISUALIZING IPTABLES LOGSATTACK SPOOFINGA COMPLETE FWSNORT SCRIPTCOLOPHON

About the Author

Michael Rash is a Security Architect on the Dragon Intrusion Detection System with Enterasys Networks, Inc., and is a frequent contributor to open source projects. As the creator of psad, fwknop, and fwsnort, Rash is an expert on firewalls, IDSs, OS fingerprinting, and the Snort rules language. He is co-author of the book Snort 2.1 Intrusion Detection, lead-author and technical editor of the book Intrusion Prevention and Active Response, and has written security articles for Linux Journal, SysAdmin, and;login: .

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