Practical Firewalls is prepared and thoroughly researched to provide the best solutions for the firewall problems a network administrator faces. Written with the end-user in mind, this book is presented in an easy-to-understand format, giving you in-depth introductions to complex technologies such as packet filtering and application proxies. In addition, step-by-step instructions for the most commonly used commands and utilities make this book the average user's guide to success with firewalls. You will learn about the concepts that make up a firewall, and then walk through several popular commercial products. Centered on task-based solutions and easy-to-implement tips, Practical Firewalls makes you productive immediately.