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.You'll also learn how to:- Create rule sets for all kinds of network traffic, whether crossing a simple LAN, hiding behind NAT, traversing DMZs, or spanning bridges or wider networks- Set up wireless networks with access points, and lock them down using authpf and special access restrictions- Maximize flexibility and service availability via CARP, relayd, and redirection- Build adaptive firewalls to proactively defend against attackers and spammers- Harness OpenBSD's latest traffic-shaping system to keep your network responsive, and convert your existing ALTQ configurations to the new system- Stay in control of your traffic with monitoring and visualization tools (including NetFlow)The Book of PF is the essential guide to building a secure network with PF. With a little effort and this book, you'll be well prepared to unlock PF's full potential.
The Art of the Brick is the stunning photographic showcase of the work that made Nathan Sawaya the world's most famous LEGO artist.
Filled with LEGO-based airships and dirigibles, monowheels and penny-farthings, cabinets of curiosity and robots galore, Steampunk LEGO is an illustrated gallery of Victorian-era treasures, all built from LEGO.
A collection of DIY musical instruments made from everyday materials. For any lover of music making or crafts
Doing Math with Python shows you how to use Python to delve into high school-level math topics like statistics, geometry, probability, and calculus. You'll start with simple projects, like a factoring program and a quadratic-equation solver, and then create more complex projects once you've gotten the hang of things. Along the way, you'll discover new ways to explore math and gain valuable programming skills that you'll use throughout your study of math and computer science. Learn how to: -Describe your data with statistics, and visualize it with line graphs, bar charts, and scatter plots -Explore set theory and probability with programs for coin flips, dicing, and other games of chance -Solve algebra problems using Python's symbolic math functions -Draw geometric shapes and explore fractals like the Barnsley fern, the Sierpinski triangle, and the Mandelbrot set -Write programs to find derivatives and integrate functions Creative coding challenges and applied examples help you see how you can put your new math and coding skills into practice. You'll write an inequality solver, plot gravity's effect on how far a bullet will travel, shuffle a deck of cards, estimate the area of a circle by throwing 100,000 "darts" at a board, explore the relationship between the Fibonacci sequence and the golden ratio, and more. Whether you're interested in math but have yet to dip into programming or you're a teacher looking to bring programming into the classroom, you'll find that Python makes programming easy and practical. Let Python handle the grunt work while you focus on the math. Uses Python 3
Teach Your Kids to Code is a parent and teacher's guide to teaching basic programming and problem-solving skills.
The LEGO Adventure Book, Vol. 3 is an inspiring tour through the world of LEGO builders.
The Manga Guide to Physiology provides a fun introduction to physiology in comic form.
The "hows" and "whys" of How Linux Works: for administrators, programmers, and enthusiasts who want to understand the inner workings of the best operating system.
Ruby Wizardry is a modern day fairy tale that teaches programming skills kids can use.
Modern web applications are built on a tangle of technologies that have been developed over time and then haphazardly pieced together. Every piece of the web application stack, from HTTP requests to browser-side scripts, comes with important yet subtle security consequences. To keep users safe, it is essential for developers to confidently navigate this landscape.In The Tangled Web, Michal Zalewski, one of the world's top browser security experts, offers a compelling narrative that explains exactly how browsers work and why they're fundamentally insecure. Rather than dispense simplistic advice on vulnerabilities, Zalewski examines the entire browser security model, revealing weak points and providing crucial information for shoring up web application security.You'll learn how to:-Perform common but surprisingly complex tasks such as URL parsing and HTML sanitization-Use modern security features like Strict Transport Security, Content Security Policy, and Cross-Origin Resource Sharing-Leverage many variants of the same-origin policy to safely compartmentalize complex web applications and protect user credentials in case of XSS bugs-Build mashups and embed gadgets without getting stung by the tricky frame navigation policy-Embed or host user-supplied content without running into the trap of content sniffingFor quick reference, "Security Engineering Cheat Sheets" at the end of each chapter offer ready solutions to problems you're most likely to encounter. With coverage extending as far as planned HTML5 features, The Tangled Web will help you create secure web applications that stand the test of time.
Kumi loves to eat, but she's worried that her passion for junk food is affecting her health. Determined to unlock the secrets of dieting, she enlists the help of her brainy friend Nemoto and his beautiful biochemistry professor, Dr. Kurosaka. And so it begins...Follow along in The Manga Guide to Biochemistry as Kumi explores the mysteries of her body's inner workings. With the help of RoboCat, the professor's friendly endoscopic robot, you'll soar through the incredible chemical machinery that keeps us alive and get an up-close look at biopolymers like DNA and proteins, the metabolic processes that turn our food into energy, and the enzymes that fuel our bodies' chemical reactions.As you dive into the depths of plant and animal cells, you'll learn about:-The metabolism of substances like carbohydrates, lipids, proteins, and alcohol-How the energy powerhouses known as mitochondria produce ATP-DNA transcription and the different types of RNA that work together to translate the genetic code into proteins-Enzyme kinetics, how they're measured, and how enzyme inhibition worksWhether you're a medical student, an amateur scientist, or just curious about how your body turns cupcakes into energy, The Manga Guide to Biochemistry is your key to understanding the science of life.
Ruby is famous for being easy to learn, but most users only scratch the surface of what it can do. While other books focus on Ruby''s trendier features, The Book of Ruby reveals the secret inner workings of one of the world''s most popular programming languages, teaching you to write clear, maintainable code.You''ll start with the basics—types, data structures, and control flows—and progress to advanced features like blocks, mixins, metaclasses, and beyond. Rather than bog you down with a lot of theory, The Book of Ruby takes a hands-on approach and focuses on making you productive from day one.As you follow along, you’ll learn to:–Leverage Ruby''s succinct and flexible syntax to maximize your productivity–Balance Ruby''s functional, imperative, and object-oriented features–Write self-modifying programs using dynamic programming techniques–Create new fibers and threads to manage independent processes concurrently–Catch and recover from execution errors with robust exception handling–Develop powerful web applications with the Ruby on Rails frameworkEach chapter includes a "Digging Deeper" section that shows you how Ruby works under the hood, so you''ll never be caught off guard by its deceptively simple scoping, multithreading features, or precedence rules.Whether you''re new to programming or just new Ruby, The Book of Ruby is your guide to rapid, real-world software development with this unique and elegant language.
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