Linux Firewalls, Third Edition

Introduction

This book is essentially about creating a software-based firewall using Netfilter and iptables in the Linux operating system. Beyond the basics of a firewall, this book also looks at the firewall in the context of a networked computing environment. To that end, topics such as intrusion detection and system security are also covered.

Computer security is an expansive subject area. Volumes have been written about it and volumes will continue to be written about it. Computer security is centered around protection of data assets using three principles: confidentiality, integrity, and availability. Confidentiality means that data is accessible only by those who are authorized to access the data and no one else. Integrity ensures that the ...