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Firewalls, Network Address Translation (NAT), network logging and accounting are all provided by Linux's Netfilter system, also known by the name of the command used to administer it, iptables. The iptables interface is the most sophisticated ever offered onLinux and makes Linux an extremely flexible system for any kind of network filtering you might do. Large sets of filtering rules can be grouped in ways that makes it easy to test them and turn them on and off.Do you watch for all types of ICMP traffic--some of them quite dangerous? Can you take advantage of stateful filtering to simplify the management of TCP connections? Would you like to track how much traffic of various types you get?This pocket reference will help you at those critical moments...

The KDE and Gnome desktops have developed into mature operating environments. These technologies not only act as interfaces between the user, the powerful Linux kernel and GNU operating system, but they do so in a fun and intuitive way. Many users are content with the tools and facilities included with these desktops, but--for those who are ready to probe a little deeper--much more functionality can be found by going under the hood.With hacks that any user can follow, Linux Desktop Hacks demonstrates how easy it is to modify Linux to suit your desires. The book is packed with tips on customizing and improving the interface, boosting performance, administering your desktop, and generally making the most out of what X, KDE, Gnome, and the console have ...

Linux and Open Source are attracting unprecedented attention in the high tech world. Debian GNU/Linux is a remarkable demonstration of what the Open Source model can produce: Debian is an all volunteer organization, and their distribution contains only open-source software.This exciting new world can be intimidating for those whose primary computing experience is Microsoft Windows. In Learning Debian/GNU Linux, Bill McCarty has written a book for this new audience, aimed at introducing them to a Unix style operating system.Learning Debian GNU/Linux will guide any new user of Linux through the installing and use of Debian GNU/Linux, the entirely Open Source version of the Linux operating system. It demystifies Linux in terms familiar to Windows users ...

With the introduction of Ferret, Ruby users now have one of the fastest and most flexible search libraries available. And it's surprisingly easy to use.This book will show you how to quickly get up and running with Ferret. You'll learn how to index different document types such as PDF, Microsoft Word, and HTML, as well as how to deal with foreign languages and different character encodings. Ferret describes the Ferret Query Language in detail along with the object-oriented approach to building queries.You will also be introduced to sorting, filtering, and highlighting your search results, with an explanation of exactly how you need to set up your index to perform these tasks. You will also learn how to optimize a Ferret index for lightning fast index...

How do you develop products that people will actually use and buy? This practical guide shows you how to validate product and company ideas through customer development research-before you waste months and millions on a product or service that no one needs or wants.With a combination of open-ended interviewing and fast and flexible research techniques, you'll learn how your prospective customers behave, the problems they need to solve, and what frustrates and delights them. These insights may shake your assumptions, but they'll help you reach the "ah-ha!" moments that inspire truly great products.Validate or invalidate your hypothesis by talking to the right peopleLearn how to conduct successful customer interviews play-by-playDetect a cust...