Book Description
The purpose of this book is to first provide the reader with a deep understanding of TCP/IP layers, protocols and packet formats and subsequently provide a step-by-step outline of iptables and Netfilter configuration to implement a secure Linux environment. The book also covers topics such as Network Address Translation (NAT) and both stateful and stateless packet filtering including a number of example scripts to jump-start the firewall configuration process.

On completion of this book the reader will have a clear understanding of network protocols, packet formats, firewall configuration, packet filtering concepts and practical experience using the iptables and Netfilter frameworks.

Intended Audience
This book is intended for experienced and new Linux administrators alike, with some previous knowledge about Linux/Unix, shell scripting, as well as how to compile a kernel, and some simple knowledge about the kernel internals. It's also a recommended reading for anyone just looking to get a better understanding of network protocols and Linux firewalls.

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