Linux Firewalls, Second Edition is a revision of Bob Ziegler's best-selling Linux Firewalls. This security bible includes a comprehensive summary of iptables and how to use this powerful new technology effectively with the new Linux kernel. Focusing primarily on the security needs of residential users and small to mid-sized businesses, this book shows you how to secure your system quickly and efficiently.
Ziegler clearly explains iptables (the ipchains replacement), its new convection-state tracking, and the basic steps of designing and implementing an iptables packet-filtering firewall. In addition, he describes and demonstrates firewall optimization, the full NAT capabilities in iptables, and how to forward incoming requests through NAT to an internal server without using third-party software. This book provides the most useful and in-depth information available on Linux firewalls.