8022.11 Wifi networks.pdf

Alan Holt

Chi-Yu Huang

802.11 Wireless

Networks

Security and Analysis

Dr. Alan Holt

IP Performance

1-3 Merietts Court

Long Ashton Business Park

Long Ashton

Bristol BS41 9LW

Dr. Chi-Yu Huang

Tata Technologies Ltd

6 Monarch Court

Emerald Park

Emersons Green

Bristol BS16 7FH

Series Editor

Professor A.J. Sammes, BSc, MPhil, PhD, FBCS, CEng

Centre for Forensic Computing

Cranﬁeld University

DCMT, Shrivenham

Swindon SN6 8LA

ISSN 1617-7975

ISBN 978-1-84996-274-2

e-ISBN 978-1-84996-275-9

DOI 10.1007/978-1-84996-275-9

Springer London Dordrecht Heidelberg New York

British Library Cataloguing in Publication Data

A catalogue record for this book is available from the British Library

Library of Congress Control Number: 2010930228

Apart from any fair dealing for the purposes of research or private study, or criticism or review, as per-

mitted under the Copyright, Designs and Patents Act 1988, this publication may only be reproduced,

stored or transmitted, in any form or by any means, with the prior permission in writing of the publish-

ers, or in the case of reprographic reproduction in accordance with the terms of licenses issued by the

the publishers.

The use of registered names, trademarks, etc., in this publication does not imply, even in the absence of a

speciﬁc statement, that such names are exempt from the relevant laws and regulations and therefore free

for general use.

The publisher makes no representation, express or implied, with regard to the accuracy of the information

contained in this book and cannot accept any legal responsibility or liability for any errors or omissions

that may be made.

Cover design : VTEX, Vilnius

Printed on acid-free paper

Springer is part of Springer Science+Business Media ( www.springer.com )

Preface

This book is about wireless local area networks (WLANs) based upon the IEEE

802.11 standards. It has three primary objectives:

•

To introduce the principles of 802.11 wireless networks and show how to conﬁg-

ure equipment in order to implement various network solutions.

•

To provide an understanding of the security implications of wireless networks and

demonstrate how vulnerabilities can be mitigated.

•

To introduce the underlying 802.11 protocols and build mathematical models in

order to analyse performance in a WLAN environment.

The book is aimed at industry professionals as well as undergraduate and gradu-

ate level students. It is intended as a companion for a university course on wireless

networking.

A practical approach is adopted in this book; examples are provided throughout,

supported by detailed instructions. We cover a number of wireless vendors; namely,

Cisco’s Aironet, Alactel-Lucent’s Omniaccess and Meru Networks. While separate

vendors, all three systems have a Cisco IOS-like command-line interface.

The GNU/Linux operating system is used extensively throughout this book.

GNU/Linux systems have gained considerable popularity in the server and em-

bedded system market (indeed, both Alcatel-Lucent and Meru Network’s wireless

equipment are based upon GNU/Linux). As well as the core GNU/Linux software

we also use a number of open source applications. Wireless equipment does not op-

erate in isolation. There are times when other network services are required, such as

RADIUS. FreeRADIUS, in conjunction with a MySQL database server, is used to

demonstrate an enterprise secutity WLAN. For convenience, the Xen virtualisation

application is employed to emulate a multi-server environment. We show how to

build and conﬁgure these systems.

There are many GNU/Linux distributions available. In this book, we use Debian

and its derivative, Ubuntu. Debian and Debian like distributions have APT, a power-

ful package management application that greatly simpliﬁes software installation and

maintenance. Other distributions will have their advocates and supporters and if you

wish to replicate the examples in this book we suggest you use the distribution with

vii

viii

Preface

which you are most familiar. However, you will have to translate the instructions to

suit your distribution where they differ from Ubuntu/Debian.

We present a number of mathematical models in this book for analysing the per-

formance of 802.11. We show how to build these models using the commercial

application computer algebra, Maple. The examples presented in this book were

developed on Maple version 11, but all the examples should work on older versions.

Acknowledgments

The authors would like to thank the following people for the valuable contribu-

tion they made to this book: Dr Adrian Davies, Dr Sue Casson (Leeds University),

Michael Dewsnip (DL Consulting), Wayne Look (IP Performance), and Damien

Parker (IP Performance).

Thanks also to Simon Rees of Spinger for all his support in helping us through

this process.

Bristol, UK

Alan Holt

Hamilton, New Zealand

Chi-Yu Huang

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: