Snort

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Snort 2.1 Intrusion Detection, Second Edition

Author : Brian Caswell
Publisher : Elsevier
ISBN 13 : 0080480993
Total Pages : 753 pages
Book Rating : 4.0/5 (84 download)

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Book Synopsis Snort 2.1 Intrusion Detection, Second Edition by : Brian Caswell

Download or read book Snort 2.1 Intrusion Detection, Second Edition written by Brian Caswell and published by Elsevier. This book was released on 2004-06-06 with total page 753 pages. Available in PDF, EPUB and Kindle. Book excerpt: Called "the leader in the Snort IDS book arms race" by Richard Bejtlich, top Amazon reviewer, this brand-new edition of the best-selling Snort book covers all the latest features of a major upgrade to the product and includes a bonus DVD with Snort 2.1 and other utilities.Written by the same lead engineers of the Snort Development team, this will be the first book available on the major upgrade from Snort 2 to Snort 2.1 (in this community, major upgrades are noted by .x and not by full number upgrades as in 2.0 to 3.0). Readers will be given invaluable insight into the code base of Snort, and in depth tutorials of complex installation, configuration, and troubleshooting scenarios. Snort has three primary uses: as a straight packet sniffer, a packet logger, or as a full-blown network intrusion detection system. It can perform protocol analysis, content searching/matching and can be used to detect a variety of attacks and probes. Snort uses a flexible rules language to describe traffic that it should collect or pass, a detection engine that utilizes a modular plug-in architecture, and a real-time alerting capability. A CD containing the latest version of Snort as well as other up-to-date Open Source security utilities will accompany the book.Snort is a powerful Network Intrusion Detection System that can provide enterprise wide sensors to protect your computer assets from both internal and external attack.* Completly updated and comprehensive coverage of snort 2.1* Includes free CD with all the latest popular plug-ins* Provides step-by-step instruction for installing, configuring and troubleshooting

Snort For Dummies

Author : Charlie Scott
Publisher : John Wiley & Sons
ISBN 13 : 0764576895
Total Pages : 386 pages
Book Rating : 4.7/5 (645 download)

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Book Synopsis Snort For Dummies by : Charlie Scott

Download or read book Snort For Dummies written by Charlie Scott and published by John Wiley & Sons. This book was released on 2004-06-14 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Snort is the world's most widely deployed open source intrusion-detection system, with more than 500,000 downloads-a package that can perform protocol analysis, handle content searching and matching, and detect a variety of attacks and probes Drawing on years of security experience and multiple Snort implementations, the authors guide readers through installation, configuration, and management of Snort in a busy operations environment No experience with intrusion detection systems (IDS) required Shows network administrators how to plan an IDS implementation, identify how Snort fits into a security management environment, deploy Snort on Linux and Windows systems, understand and create Snort detection rules, generate reports with ACID and other tools, and discover the nature and source of attacks in real time CD-ROM includes Snort, ACID, and a variety of management tools

Snort Cookbook

Author : Angela Orebaugh
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 059655270X
Total Pages : 290 pages
Book Rating : 4.5/5 (965 download)

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Book Synopsis Snort Cookbook by : Angela Orebaugh

Download or read book Snort Cookbook written by Angela Orebaugh and published by "O'Reilly Media, Inc.". This book was released on 2005-03-29 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: If you are a network administrator, you're under a lot of pressure to ensure that mission-critical systems are completely safe from malicious code, buffer overflows, stealth port scans, SMB probes, OS fingerprinting attempts, CGI attacks, and other network intruders. Designing a reliable way to detect intruders before they get in is an essential--but often overwhelming--challenge. Snort, the defacto open source standard of intrusion detection tools, is capable of performing real-time traffic analysis and packet logging on IP network. It can perform protocol analysis, content searching, and matching. Snort can save countless headaches; the new Snort Cookbook will save countless hours of sifting through dubious online advice or wordy tutorials in order to leverage the full power of SNORT.Each recipe in the popular and practical problem-solution-discussion O'Reilly cookbook format contains a clear and thorough description of the problem, a concise but complete discussion of a solution, and real-world examples that illustrate that solution. The Snort Cookbook covers important issues that sys admins and security pros will us everyday, such as: installation optimization logging alerting rules and signatures detecting viruses countermeasures detecting common attacks administration honeypots log analysis But the Snort Cookbook offers far more than quick cut-and-paste solutions to frustrating security issues. Those who learn best in the trenches--and don't have the hours to spare to pore over tutorials or troll online for best-practice snippets of advice--will find that the solutions offered in this ultimate Snort sourcebook not only solve immediate problems quickly, but also showcase the best tips and tricks they need to master be security gurus--and still have a life.

Intrusion Detection with Snort

Author : Jack Koziol
Publisher : Sams Publishing
ISBN 13 : 9781578702817
Total Pages : 364 pages
Book Rating : 4.7/5 (28 download)

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Book Synopsis Intrusion Detection with Snort by : Jack Koziol

Download or read book Intrusion Detection with Snort written by Jack Koziol and published by Sams Publishing. This book was released on 2003 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: The average Snort user needs to learn how to actually get their systems up-and-running. "Snort Intrusion Detection" provides readers with practical guidance on how to put Snort to work. Opening with a primer to intrusion detection, the book takes readers through planning an installation to building the server and sensor.

Managing Security with Snort & IDS Tools

Author : Kerry J. Cox
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 0596552432
Total Pages : 291 pages
Book Rating : 4.5/5 (965 download)

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Book Synopsis Managing Security with Snort & IDS Tools by : Kerry J. Cox

Download or read book Managing Security with Snort & IDS Tools written by Kerry J. Cox and published by "O'Reilly Media, Inc.". This book was released on 2004-08-02 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intrusion detection is not for the faint at heart. But, if you are a network administrator chances are you're under increasing pressure to ensure that mission-critical systems are safe--in fact impenetrable--from malicious code, buffer overflows, stealth port scans, SMB probes, OS fingerprinting attempts, CGI attacks, and other network intruders.Designing a reliable way to detect intruders before they get in is a vital but daunting challenge. Because of this, a plethora of complex, sophisticated, and pricy software solutions are now available. In terms of raw power and features, SNORT, the most commonly used Open Source Intrusion Detection System, (IDS) has begun to eclipse many expensive proprietary IDSes. In terms of documentation or ease of use, however, SNORT can seem overwhelming. Which output plugin to use? How do you to email alerts to yourself? Most importantly, how do you sort through the immense amount of information Snort makes available to you?Many intrusion detection books are long on theory but short on specifics and practical examples. Not Managing Security with Snort and IDS Tools. This new book is a thorough, exceptionally practical guide to managing network security using Snort 2.1 (the latest release) and dozens of other high-quality open source other open source intrusion detection programs.Managing Security with Snort and IDS Tools covers reliable methods for detecting network intruders, from using simple packet sniffers to more sophisticated IDS (Intrusion Detection Systems) applications and the GUI interfaces for managing them. A comprehensive but concise guide for monitoring illegal entry attempts, this invaluable new book explains how to shut down and secure workstations, servers, firewalls, routers, sensors and other network devices.Step-by-step instructions are provided to quickly get up and running with Snort. Each chapter includes links for the programs discussed, and additional links at the end of the book give administrators access to numerous web sites for additional information and instructional material that will satisfy even the most serious security enthusiasts.Managing Security with Snort and IDS Tools maps out a proactive--and effective--approach to keeping your systems safe from attack.

Intrusion Detection Systems with Snort

Author : Rafeeq Ur Rehman
Publisher : Prentice Hall Professional
ISBN 13 : 9780131407336
Total Pages : 290 pages
Book Rating : 4.4/5 (73 download)

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Book Synopsis Intrusion Detection Systems with Snort by : Rafeeq Ur Rehman

Download or read book Intrusion Detection Systems with Snort written by Rafeeq Ur Rehman and published by Prentice Hall Professional. This book was released on 2003 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide to Open Source intrusion detection tool SNORT features step-by-step instructions on how to integrate SNORT with other open source products. The book contains information and custom built scripts to make installation easy.

Snort Intrusion Detection and Prevention Toolkit

Author : Brian Caswell
Publisher : Syngress
ISBN 13 : 0080549276
Total Pages : 770 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Snort Intrusion Detection and Prevention Toolkit by : Brian Caswell

Download or read book Snort Intrusion Detection and Prevention Toolkit written by Brian Caswell and published by Syngress. This book was released on 2007-04-11 with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt: This all new book covering the brand new Snort version 2.6 from members of the Snort developers team.This fully integrated book and Web toolkit covers everything from packet inspection to optimizing Snort for speed to using the most advanced features of Snort to defend even the largest and most congested enterprise networks. Leading Snort experts Brian Caswell, Andrew Baker, and Jay Beale analyze traffic from real attacks to demonstrate the best practices for implementing the most powerful Snort features. The book will begin with a discussion of packet inspection and the progression from intrusion detection to intrusion prevention. The authors provide examples of packet inspection methods including: protocol standards compliance, protocol anomaly detection, application control, and signature matching. In addition, application-level vulnerabilities including Binary Code in HTTP headers, HTTP/HTTPS Tunneling, URL Directory Traversal, Cross-Site Scripting, and SQL Injection will also be analyzed. Next, a brief chapter on installing and configuring Snort will highlight various methods for fine tuning your installation to optimize Snort performance including hardware/OS selection, finding and eliminating bottlenecks, and benchmarking and testing your deployment. A special chapter also details how to use Barnyard to improve the overall performance of Snort. Next, best practices will be presented allowing readers to enhance the performance of Snort for even the largest and most complex networks. The next chapter reveals the inner workings of Snort by analyzing the source code. The next several chapters will detail how to write, modify, and fine-tune basic to advanced rules and pre-processors. Detailed analysis of real packet captures will be provided both in the book and the companion material. Several examples for optimizing output plugins will then be discussed including a comparison of MySQL and PostrgreSQL. Best practices for monitoring Snort sensors and analyzing intrusion data follow with examples of real world attacks using: ACID, BASE, SGUIL, SnortSnarf, Snort_stat.pl, Swatch, and more.The last part of the book contains several chapters on active response, intrusion prevention, and using Snort's most advanced capabilities for everything from forensics and incident handling to building and analyzing honey pots. - This fully integrated book and Web toolkit covers everything all in one convenient package - It is authored by members of the Snort team and it is packed full of their experience and expertise - Includes full coverage of the brand new Snort version 2.6, packed full of all the latest information

Snort Intrusion Detection 2.0

Author : Syngress
Publisher : Elsevier
ISBN 13 : 0080481000
Total Pages : 559 pages
Book Rating : 4.0/5 (84 download)

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Book Synopsis Snort Intrusion Detection 2.0 by : Syngress

Download or read book Snort Intrusion Detection 2.0 written by Syngress and published by Elsevier. This book was released on 2003-05-11 with total page 559 pages. Available in PDF, EPUB and Kindle. Book excerpt: The incredible low maintenance costs of Snort combined with its powerful security features make it one of the fastest growing IDSs within corporate IT departments. Snort 2.0 Intrusion Detection is written by a member of Snort.org. The book provides a valuable insight to the code base of Snort and in-depth tutorials of complex installation, configuration, and troubleshooting scenarios. The primary reader will be an individual who has a working knowledge of the TCP/IP protocol, expertise in some arena of IT infrastructure, and is inquisitive about what has been attacking their IT network perimeter every 15 seconds. - The most up-to-date and comprehensive coverage for Snort 2.0! - Expert Advice from the Development Team and Step-by-Step Instructions for Installing, Configuring, and Troubleshooting the Snort 2.0 Intrusion Detection System.

Nessus, Snort, and Ethereal Power Tools

Author : Brian Caswell
Publisher : Elsevier
ISBN 13 : 0080489427
Total Pages : 472 pages
Book Rating : 4.0/5 (84 download)

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Book Synopsis Nessus, Snort, and Ethereal Power Tools by : Brian Caswell

Download or read book Nessus, Snort, and Ethereal Power Tools written by Brian Caswell and published by Elsevier. This book was released on 2005-09-14 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nessus, Snort, and Ethereal Power Tools covers customizing Snort to perform intrusion detection and prevention; Nessus to analyze the network layer for vulnerabilities; and Ethereal to sniff their network for malicious or unusual traffic. The book contains an appendix detailing the best of the rest open source security tools. Each of these tools is intentionally designed to be highly customizable so that users can torque the programs to suit their particular needs. Users can code their own custom rules, plug-ins, and filters that are tailor-made to fit their own networks and the threats which they most commonly face. The book describes the most important concepts of coding and customizing tools, and then provides readers with invaluable working scripts that can either be used as is or further refined by using knowledge gained from the book. - Snort, Nessus, and Ethereal are the three most popular open source security tools in the world - Only book that teaches readers how to customize these tools for their specific needs by coding rules, plugins, and filters - Companion Web site provides all working code and scripts from the book for download

Hack the Stack

Author : Stephen Watkins
Publisher : Elsevier
ISBN 13 : 0080507743
Total Pages : 481 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Hack the Stack by : Stephen Watkins

Download or read book Hack the Stack written by Stephen Watkins and published by Elsevier. This book was released on 2006-11-06 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book looks at network security in a new and refreshing way. It guides readers step-by-step through the "stack" -- the seven layers of a network. Each chapter focuses on one layer of the stack along with the attacks, vulnerabilities, and exploits that can be found at that layer. The book even includes a chapter on the mythical eighth layer: The people layer. This book is designed to offer readers a deeper understanding of many common vulnerabilities and the ways in which attacker's exploit, manipulate, misuse, and abuse protocols and applications. The authors guide the readers through this process by using tools such as Ethereal (sniffer) and Snort (IDS). The sniffer is used to help readers understand how the protocols should work and what the various attacks are doing to break them. IDS is used to demonstrate the format of specific signatures and provide the reader with the skills needed to recognize and detect attacks when they occur. What makes this book unique is that it presents the material in a layer by layer approach which offers the readers a way to learn about exploits in a manner similar to which they most likely originally learned networking. This methodology makes this book a useful tool to not only security professionals but also for networking professionals, application programmers, and others. All of the primary protocols such as IP, ICMP, TCP are discussed but each from a security perspective. The authors convey the mindset of the attacker by examining how seemingly small flaws are often the catalyst of potential threats. The book considers the general kinds of things that may be monitored that would have alerted users of an attack.* Remember being a child and wanting to take something apart, like a phone, to see how it worked? This book is for you then as it details how specific hacker tools and techniques accomplish the things they do. * This book will not only give you knowledge of security tools but will provide you the ability to design more robust security solutions * Anyone can tell you what a tool does but this book shows you how the tool works

Linux Security Cookbook

Author : Daniel J. Barrett
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 1449366767
Total Pages : 335 pages
Book Rating : 4.4/5 (493 download)

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Book Synopsis Linux Security Cookbook by : Daniel J. Barrett

Download or read book Linux Security Cookbook written by Daniel J. Barrett and published by "O'Reilly Media, Inc.". This book was released on 2003-06-02 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computer security is an ongoing process, a relentless contest between system administrators and intruders. A good administrator needs to stay one step ahead of any adversaries, which often involves a continuing process of education. If you're grounded in the basics of security, however, you won't necessarily want a complete treatise on the subject each time you pick up a book. Sometimes you want to get straight to the point. That's exactly what the new Linux Security Cookbook does. Rather than provide a total security solution for Linux computers, the authors present a series of easy-to-follow recipes--short, focused pieces of code that administrators can use to improve security and perform common tasks securely.The Linux Security Cookbook includes real solutions to a wide range of targeted problems, such as sending encrypted email within Emacs, restricting access to network services at particular times of day, firewalling a webserver, preventing IP spoofing, setting up key-based SSH authentication, and much more. With over 150 ready-to-use scripts and configuration files, this unique book helps administrators secure their systems without having to look up specific syntax. The book begins with recipes devised to establish a secure system, then moves on to secure day-to-day practices, and concludes with techniques to help your system stay secure.Some of the "recipes" you'll find in this book are: Controlling access to your system from firewalls down to individual services, using iptables, ipchains, xinetd, inetd, and more Monitoring your network with tcpdump, dsniff, netstat, and other tools Protecting network connections with Secure Shell (SSH) and stunnel Safeguarding email sessions with Secure Sockets Layer (SSL) Encrypting files and email messages with GnuPG Probing your own security with password crackers, nmap, and handy scripts This cookbook's proven techniques are derived from hard-won experience. Whether you're responsible for security on a home Linux system or for a large corporation, or somewhere in between, you'll find valuable, to-the-point, practical recipes for dealing with everyday security issues. This book is a system saver.

Smoke Snort Swallow Shoot

Author : Jacob Hoye
Publisher :
ISBN 13 : 9781944713034
Total Pages : 0 pages
Book Rating : 4.7/5 (13 download)

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Book Synopsis Smoke Snort Swallow Shoot by : Jacob Hoye

Download or read book Smoke Snort Swallow Shoot written by Jacob Hoye and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpts from memoirs.

The Ambrose Deception

Author : Emily Ecton
Publisher : Little, Brown Books for Young Readers
ISBN 13 : 1484798554
Total Pages : 368 pages
Book Rating : 4.4/5 (847 download)

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Book Synopsis The Ambrose Deception by : Emily Ecton

Download or read book The Ambrose Deception written by Emily Ecton and published by Little, Brown Books for Young Readers. This book was released on 2018-02-13 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Melissa is a nobody. Wilf is a slacker. Bondi is a show-off. At least that's what their middle school teachers think. To everyone's surprise, they are the three students chosen to compete for a ten thousand-dollar scholarship, solving clues that lead them to various locations around Chicago. At first the three contestants work independently, but it doesn't take long before each begins to wonder whether the competition is a sham. It's only by secretly joining forces and using their unique talents that the trio is able to uncover the truth behind the Ambrose Deception -- a truth that involves a lot more than just a scholarship. With a narrative style as varied and intriguing as the mystery itself, this adventure involving clever clues, plenty of perks, and abhorrent adults is pure wish fulfillment.

I Love to Snort

Author : Ziad Sawi
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.4/5 (83 download)

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Book Synopsis I Love to Snort by : Ziad Sawi

Download or read book I Love to Snort written by Ziad Sawi and published by . This book was released on 2021-09-19 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Addictions: Discover A Unique Book that is not Boring, Preachy or Judgmental Discover the real-life description of the gradual fall into cocaine addiction as narrated by the eagle eye of an addiction specialist. Written in an easy-to-read, story-telling style, so you can develop awareness of the challenging times in the addiction journey ahead. I Love to Snort is a clever book by Dr. Ziad Sawi MD, it will help you learn how to prevent the negative effects of addictions and reclaim your life. Get your copy today. Here's what you will love about this book: What's an addiction, anyway? Here's how it all gets started. Observe the subtle and gradual onset of cocaine addiction. Written in the first person and in a light-hearted and humorous style for dramatic effect. Though fictional, the main character is a composite of many different people Dr. Ziad Sawi has come to know over the years. You'll find valuable medical information strategically shared through the book. Learn guided meditation/self-hypnosis session included at the end of the book. And much more! I Love to Snort: An Addiction Specialist's Description of the Gradual Fall into Cocaine Addiction and the Battle to Return to Sobriety See how a simple mindset shift can change your entire life. Get down-to-earth advice and insights through reading the story and start living life the way you have always wanted. Read a book that's professional, enlightening, and entertaining. Are you ready? Scroll up and click the "add to cart" button to buy now!

Russell, Grunt and Snort

Author : Jason Chapman
Publisher : Random House
ISBN 13 : 184941422X
Total Pages : 34 pages
Book Rating : 4.8/5 (494 download)

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Book Synopsis Russell, Grunt and Snort by : Jason Chapman

Download or read book Russell, Grunt and Snort written by Jason Chapman and published by Random House. This book was released on 2013 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three little pigs endure many animals and people wanting to eat them as they travel the world looking for a nice place to live.

WTF!

Author : Frank B. Thompson, III
Publisher : Frank B. Thompson, III
ISBN 13 : 1500643858
Total Pages : 253 pages
Book Rating : 4.5/5 (6 download)

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Book Synopsis WTF! by : Frank B. Thompson, III

Download or read book WTF! written by Frank B. Thompson, III and published by Frank B. Thompson, III. This book was released on 2014-12-24 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: What would America look like if the liberals ultimately triumph, say by the year 2050? "WTF! This is a Liberal Utopia!" - a satire on liberalism, all the unintended consequences of this heart felt way of looking at the world around oneself, usually in the cloistered halls of academia, some government agency, some left-wing, nonprofit activist organization and, or congress. A really fantabulous glimpse at what the future holds when these magnificent, starry-eyed wonders finally come out on top! By 2050, America will have gone through some slight changes thus resulting in many really noteworthy phenomena. For one, there is no longer any need for elections: there will be a "Forever President" whose last name could be 'Castro.' Furthermore, odds are 'welfare moms' will have largely replaced small business enterprises with their monthly, government stipends; most Americans will as likely as not have never worked, because it is distinctly possible that there won't be any save for those "shovel ready jobs" the Democrats will in all likelihood keep bringing up. Gaia, Mother Earth, will have probably been rescued from the threatening effects of “Global Warming,” “Global Cooling,” and “Climate Change,” by turning to more agrarian economy where ‘maze’ is likely to be the cornerstone. For those lucky enough to own wheeled transportation, they will likely be driving around in either battery-powered, bubble cars made of styrofoam, or Latino lowriders which might look a lot like sparklers driving along the potholed highways of tomorrow. The English language will have been replaced by local, cultural colloquialisms with phonetics playing the principle role for making up words and phrases and writing them out. All this and more will be seen through the eyes of one of those liberal visionaries, an Ivy League English Professor whose name is Felix Schwartz; the narrator, the author and “the reader.” A glimpse into our wondrous future and what awaits us all when the magnificent munificents are finally given the reins to take America down that ‘Yellow Brick Road’ to their utopian, imaginary 'World of OZ.' "WTF! This is a Liberal Utopia!"

Linux Firewalls

Author : Michael Rash
Publisher : No Starch Press
ISBN 13 : 1593271417
Total Pages : 338 pages
Book Rating : 4.5/5 (932 download)

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Book Synopsis Linux Firewalls by : Michael Rash

Download or read book Linux Firewalls written by Michael Rash and published by No Starch Press. This book was released on 2007-09-07 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.