The Book of PF: A No-Nonsense Guide to the OpenBSD Firewall

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OpenBSD's stateful packet filter, PF, is the heart of the OpenBSD firewall. With more and more services placing high demands on bandwidth and an increasingly hostile Internet environment, no sysadmin can afford to be without PF expertise.

The third edition of The Book of PF covers the most up-to-date developments in PF, including new content on IPv6, dual stack configurations, the "queues and priorities" traffic-shaping system, NAT and redirection, wireless networking, spam fighting, failover provision ing, logging, and more.
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bash Pocket Reference (Pocket Reference (O’Reilly))

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It's simple: you need to know how to work with the bash shell if you want to get to the heart of Mac OS X, Linux, and other Unix systems. Updated for the most recent version of bash, this concise little book puts all of the essential information about bash at your fingertips. You'll quickly find answers to annoying questions that always come up when you're writing shell scripts — What characters do you need to quote? How do you get variable substitution to do exactly what you want? How do you use arrays? — and much more.

If you're a user or programmer of any Unix variant, or if you're using bash on Windows, you'll find this pocket reference indispensable. This book covers:Invoking the ShellSyntaxFunctionsVariablesArithmetic ExpressionsCommand HistoryProgrammable CompletionJob ControlShell OptionsCommand ExecutionCoprocessesRestricted ShellsBuilt-in Commands

Linux Firewalls: Enhancing Security with nftables and Beyond (4th Edition)

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The Definitive Guide to Building Firewalls with Linux

As the security challenges facing Linux system and network administrators have grown, the security tools and techniques available to them have improved dramatically. In Linux® Firewalls, Fourth Edition, long-time Linux security expert Steve Suehring has revamped his definitive Linux firewall guide to cover the important advances in Linux security.
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Microsoft Windows Repair Book – All Versions: Remove Viruses & Passwords in Minutes!! (The Help Section) (Volume 1)

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The Help Section Series: Windows Repair-All Versions Windows XP, Windows Vista, Windows 7, Windows 8, and Windows 8.1 Paying for your computer repair is about to become a thing of the past! Information is power and all too often, I hear about people getting ripped off by these so-called computer repair facilities. I mean wouldn't you want to know that most of the services the professionals use are right at your fingertips? I know I would. It would be a total bummer if your computer starts to act up right when you are researching something….in the middle of the night! The Help Section covers many of the tips and tricks I use to remedy slow moving, virus infected, and junked up computers that will essentially return any computer to full speed. Repair all versions of Windows from XP through Windows 8.1 plus how to remove passwords if you get locked out. Also, this must have eBook contains all steps, by computer model, on how to restore your computer to factory default condition just like when you first purchased it. Information included within this eBook: how to remove passwords step by step (with illustrations), tips, Windows 7 OS boot disks (works on all versions of Windows 7), reset and restore Windows 8 and 8.1, anti-virus software links, photos and graphics. I will take you from the start up of your Desktop or Laptop all the way through stopping the sluggish behavior of your PC. This is a must have book for the D.I.Y person that cares about not wasting money and learning a new trade, if needed. When you are finished with this very simple lesson you will come away with the valuable knowledge of how to fix any Windows computer and the benefit of knowing what the pros know! Everything that we are going to provide for you will be absolutely free (except the cost of this book). REQUIREMENTS: Windows Operating System This book covers all versions of Windows.

Linux Bible

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The industry favorite Linux guide, updated for Red Hat Enterprise Linux 7 and the cloud

Linux Bible, 9th Edition is the ultimate hands-on Linux user guide, whether you're a true beginner or a more advanced user navigating recent changes. This updated ninth edition covers the latest versions of Red Hat Enterprise Linux 7 (RHEL 7), Fedora 21, and Ubuntu 14.04 LTS, and includes new information on cloud computing and development with guidance on Openstack and Cloudforms. With a focus on RHEL 7, this practical guide gets you up to speed quickly on the new enhancements for enterprise-quality file systems, the new boot process and services management, firewalld, and the GNOME 3 desktop. Written by a Red Hat expert, this book provides the clear explanations and step-by-step instructions that demystify Linux and bring the new features seamlessly into your workflow.
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