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Linux Firewalls, Fourth Edition updates the definitive Linux firewall guide to include all the latest advances in Linux firewall technology. It includes comprehensive coverage of both iptables and nftables, the new firewall software for the Linux kernel. 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 professionals will learn how to configure and customize 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. From standalone firewalls to rules debugging and firewall optimization, Linux Firewalls, Fourth Edition is the definitive working resource for every Linux sysadmin concerned with security -- in other words, for every Linux sysadmin, period.