Timothy Rooney - IP Address Management (IEEE Press Series on Networks and Service Management)

1. Chapter 2
2. Chapter 3
3. Chapter 7
4. Chapter 13
5. Chapter 14
6. Chapter 15
7. Chapter 17
8. Chapter 18
9. Chapter 19

1. Chapter 1
2. Chapter 2
3. Chapter 3
4. Chapter 4
5. Chapter 5
6. Chapter 6
7. Chapter 7
8. Chapter 8
9. Chapter 9
10. Chapter 10
11. Chapter 11
12. Chapter 12
13. Chapter 13
14. Chapter 14
15. Chapter 16
16. Chapter 17
17. Chapter 18
18. Chapter 19

Second Edition

Michael Dooley & Timothy Rooney

Copyright 2021 by The Institute of Electrical and Electronics Engineers, Inc.

All rights reserved.

Published by John Wiley & Sons, Inc., Hoboken, New Jersey.

Published simultaneously in Canada.

No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning, or otherwise, except as permitted under Section 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, Inc., 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 750-4470, or on the web at www.copyright.com. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) 748-6011, fax (201) 748-6008, or online at http://www.wiley.com/go/permission.

Limit of Liability/Disclaimer of Warranty: While the publisher and author have used their best efforts in preparing this book, they make no representations or warranties with respect to the accuracy or completeness of the contents of this book and specifically disclaim any implied warranties of merchantability or fitness for a particular purpose. No warranty may be created or extended by sales representatives or written sales materials. The advice and strategies contained herein may not be suitable for your situation. You should consult with a professional where appropriate. Neither the publisher nor author shall be liable for any loss of profit or any other commercial damages, including but not limited to special, incidental, consequential, or other damages.

For general information on our other products and services or for technical support, please contact our Customer Care Department within the United States at (800) 762-2974, outside the United States at (317) 572-3993 or fax (317) 572-4002.

Wiley also publishes its books in a variety of electronic formats. Some content that appears in print may not be available in electronic formats. For more information about Wiley products, visit our web site at www.wiley.com.

Library of Congress Cataloging-in-Publication Data

Names: Rooney, Tim, author. | Dooley, Michael Earl, 1962- author.

Title: IP address management / Michael Dooley & Timothy Rooney.

Description: Second edition. | Hoboken, New Jersey : Wiley, 2021. | Series: IEEE press series on networks and service management | Timothy Rooney appears as the first named author in the first edition. | Includes bibliographical references and index.

Identifiers: LCCN 2020030601 (print) | LCCN 2020030602 (ebook) | ISBN 9781119692270 (cloth) | ISBN 9781119692287 (adobe pdf) | ISBN 9781119692300 (epub)

Subjects: LCSH: Internet addresses. | Internet domain names.

Classification: LCC TK5105.8835 .R66 2021 (print) | LCC TK5105.8835 (ebook) | DDC 004.67/8dc23

LC record available at https://lccn.loc.gov/2020030601

LC ebook record available at https://lccn.loc.gov/2020030602

Cover design by Wiley

Cover image: Bill Donnelley/WT Design

The Covid-19 pandemic has abruptly reset many of our perceptions about what's really necessary and important in today's world. While we hope that it is but a distant albeit seminal memory by the time you read this, it is nevertheless an event of sea change proportions. Many of us have come to realize how we've taken for granted the people serving the critical essentials underpinning our daily lives. First and foremost, the doctors, nurses, hospital workers, and first responders willingly risk their own safety to rescue us should we need their help. Many others risk exposure to the virus by serving the broader community, such as those working at grocery stores, critical retail stores, delivery companies, food banks, and other core establishments. We are grateful for their courage and dedication in supporting our fundamental means of existence.

We also commend the other heroes, who lie further behind the front lines as auxiliaries, and while less susceptible to direct broad-based virus exposure, nonetheless serve an indispensable role in meeting basic needs of modern life that lie just above health, food, and shelter. This includes (but is certainly not limited to) those who work in financial institutions who are helping those sorely short of cash due to economic conditions, those in government supporting administration of key services, and those who, near and dear to our hearts, help keep the Internet and our Internet Protocol ( IP ) networks up and running.

In today's world, the Internet is indispensable for communication and interaction especially in times of quarantine (at least for those who have Internet access, though that's a subject for another book). We rely on the Internet for the web, email, video conferencing, streaming, mobile communications, managing our homes and personal lives, and much more. And the tireless efforts of network engineers, administrators, and operations personnel, collectively IP managers, help assure all of our Internet devices work reliably wherever we are, whenever we need them. These IP managers have prepared in advance and keep close watch so your devices can connect to the Internet by obtaining IP addresses, and you can navigate your browser, email, and apps in human-readable language, not the numerical language of Internet devices.

These activities, comprising the practice of Internet Protocol address management ( IPAM ), encompass the application of network management disciplines to IP address space and associated network services, namely DHCP ( dynamic host configuration protocol ) and DNS ( Domain Name System ). The consequence of inadequately configuring DHCP is that end users may not be able to obtain IP addresses to access the network. Without proper DNS configuration, usability of the network will greatly suffer because the name-to-address lookup process may fail. Imagine having to navigate to a website or send an email or an instant message by IP address instead of by name!

It's equally important that these DHCP and DNS configurations be based on a common IP address plan, which maps out the IP address hierarchy, subnets, DHCP address pools, and DNS domains. The linkages among the IP address plan, DHCP server configuration and DNS server configuration are inseparable; a change of an IP address will affect DNS information and perhaps DHCP as well. These critical network functions provide the foundation for today's converged services IP networks, which comprise most enterprise and service provider networks, so they must be managed using a rigorous approach.