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Designing and Implementing Linux Firewalls and QoS using netfilter, iproute2, NAT and l7-filter

By : Lucian Gheorghe
Book Image

Designing and Implementing Linux Firewalls and QoS using netfilter, iproute2, NAT and l7-filter

By: Lucian Gheorghe

Overview of this book

Firewalls are used to protect your network from the outside world. Using a Linux firewall, you can do a lot more than just filtering packets. This book shows you how to implement Linux firewalls and Quality of Service using practical examples from very small to very large networks. After giving us a background of network security, the book moves on to explain the basic technologies we will work with, namely netfilter, iproute2, NAT and l7-filter. These form the crux of building Linux firewalls and QOS. The later part of the book covers 5 real-world networks for which we design the security policies, build the firewall, setup the script, and verify our installation. Providing only necessary theoretical background, the book takes a practical approach, presenting case studies and plenty of illustrative examples.

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Designing and Implementing Linux Firewalls and QoS using netfilter, iproute2, NAT and l7-filter
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Table of Contents (14 chapters)
Designing and Implementing Linux Firewalls and QoS using netfilter, iproute2, NAT, and L7-filter
Designing and Implementing Linux Firewalls and QoS using netfilter, iproute2, NAT, and L7-filter
Credits
Credits
About the Author
About the Author
About the Reviewer
About the Reviewer
Preface
Preface
Free Chapter
1
Networking Fundamentals
Networking Fundamentals
The OSI Model
The TCP/IP Model
OSI versus TCP/IP
IP Addressing, IP Subnetting, and IP Supernetting
How the Internet Works
Summary
2
Security Threats
Security Threats
Layer 1 Security Threats
Layer 2 Security Threats
Layer 3 Security Threats
Layer 4 Security Threats
Layer 5, 6, and 7 Security Threats
Summary
3
Prerequisites: netfilter and iproute2
Prerequisites: netfilter and iproute2
netfilter/iptables
iproute2 and Traffic Control
Summary
4
NAT and Packet Mangling with iptables
NAT and Packet Mangling with iptables
A Short Introduction to NAT and PAT (NAPT)
NAT Using iptables
Packet Mangling with iptables
Summary
5
Layer 7 Filtering
Layer 7 Filtering
When to Use L7-filter
How Does L7-filter Work?
Installing L7-filter
L7-filter Applications
IPP2P: A P2P Match Option
IPP2P versus L7-filter
Summary
6
Small Networks Case Studies
Small Networks Case Studies
Linux as SOHO Router
Linux as Router for a Typical Small to Medium Company
Summary
7
Medium Networks Case Studies
Medium Networks Case Studies
Example 1: A Company with Remote Locations
Example 2: A Typical Small ISP
Summary
8
Large Networks Case Studies
Large Networks Case Studies
Thinking Large, Thinking Layered Models
A Real Large Network Example
Summary
Index
Index

Designing and Implementing Linux Firewalls and QoS using netfilter, iproute2, NAT, and L7-filter

Copyright © 2006 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, Packt Publishing, nor its dealers or distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: October 2006

Production Reference: 2181006

Published by Packt Publishing Ltd.

32 Lincoln Road

Olton

Birmingham, B27 6PA, UK.

ISBN 1-904811-65-5

www.packtpub.com

Cover Image by www.visionwt.com

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