This book's distribution-neutral content has been updated for the current Linux kernel and includes code examples for Red Hat, SUSE, and Debian implementations. Linux students will learn how to configure and customise modern firewalls for any Linux computer and for networks of all sizes, from home to enterprise. Building on the solid networking and firewalling foundation from previous editions, this edition adds extensive coverage of IPv6 firewalling, wireless network firewalls, modern security techniques, new tools, iptables enhancements, VPNs, and more.