IP Fundamentals: What Everyone Needs to Know About Addressing and Routing

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9780139754838: IP Fundamentals: What Everyone Needs to Know About Addressing and Routing

A hands-on guide that teaches the fundamentals of IP addressing, routing, and troubleshooting - with real-world exercises and examples throughout. It contains coverage of the IP protocol itself; how IP operates over Ethernet, Token Ring, ATM, FDDI, and Frame Relay; the interplay between addressing and routing; and OSPF.

Les informations fournies dans la section « Synopsis » peuvent faire référence à une autre édition de ce titre.

Review :

Readers interested in achieving mastery of the Internet Protocol (IP) addressing system and its related protocols should consult the superior information provided in IP Fundamentals.

Author Thomas A. Maufer begins with a discussion of the IP numbering system, including excellent coverage of subnetting, supernetting, and the differences between IPv4 and IPv6. The author reveals the intricacies of variable-length subnet masking (VLSM) and classless inter-domain routing (CIDR) before addressing how IP operates in various infrastructures, including Ethernet, Point-to-Point Protocol (PPP), Token Ring, and Frame Relay. In his discussion of IP routing, the author shows how the two versions of Routing Information Protocol (RIPv1 and RIPv2) and Open Shortest Path First (OSPF) work, both independently and in heterogeneous routing environments.

Maufer strikes a commendable balance between thoroughness and practicality. He makes sure--through liberal use of examples--that you understand everything necessary to complete your job. But he also goes to extraordinary lengths to bolster your grasp of the IP suite; his chapters conclude with fact-rich endnotes, plus references to journal articles and standards documents. In this way, IP Fundamentals helps you surpass mere technical competence to become an IP addressing and routing expert. --David Wall

From the Inside Flap :

PREFACE
The Internet Protocol has become the dominant networking protocol in use today, and its use continues to grow rapidly, with no end in sight. Thankfully, tools like the World-Wide Web (WWW) have put a friendlier face on the Internet, allowing its users to have a relatively painless experience. From the applications side (top-down), the WWW has made a huge difference, since the pre-WWW Internet was not really what one would call a consumer-oriented service.

However, the WWW has done nothing to improve the Internet's plumbing; if anything, it has increased the strain on the infrastructure (due to greatly increased numbers of users, and the very bursty nature of web traffic).Taking a bottom-up view, it is no easier today to define subnets, configure routers, etc. Even though certain tools now exist to aid in network design, the network mnagers still may not have the basic knowledge required to make the right design choices for their networks. Given that there is a continuous stream of new networks being attached to the Internet, there is a dramatic increase in the number of people who need to manage these new networks. In order to do a good job, new network managers, and all the network managers that preceded them, need a deeper level of understanding of IP than do users.

This book is meant for people who need to understand IP networking-related issues at a deep enough level to ensure that their networks are designed and operated properly. Ideally, the users will have a smooth experience, not realizing how much is really going on beneath the surface.

Part I examines IP addressing. How many hosts should be in some subnet? What is the broadcast address for that subnet? How should the addressing boundaries for a network be defined? Why must each subnetwork's IP prefix be unique (i.e., non-overlapping)? Network managers must be able to design addressing plans and overlay them on their networks' router topologies, configure routing protocols, and understand how the big picture is supposed to work well enough so that they can fix problems when they occur.

Also, it is worth noting that a well-designed network will be far more stable than one that is designed haphazardly (or not designed at all). Manipulating IP addresses is a key foundation skill, without which IP routing protocols and forwarding make little sense. A number of critical, basic skills related to manipulating IP addresses and subnet masks, which are not covered in detail in any one book or RFC, are explained here. I am not satisfied to simply state the rules and move on, however. Thoroughly worked-out examples are provided, and each chapter includes some exercises that should help to cement understanding of the concepts involved. Solutions to each exercise are provided, along with a rationale indicating how the answer was derived. Experienced network managers have learned these lessons through experience and trial-and-error. A goal of this book is to assist new network managers in getting up to speed on the real underlying addressing and routing issues. Mastery of Part I will ensure that no IP addressing-related question will perplex a network manager.

Part II concerns itself with two related issues. First, we need to understand the forwarding decision that each router uses to process a packet. Second, we need to see how IP packets are actually transmitted across the inter-router subnetwork "hops." Over its nearly thirty-year existence,(1) standards have defined how IP works over virtually every subnetwork technology. Luckily, it is not necessary to understand all of them. Only a few have become dominant, and the lessons learned from those generalize fairly well to the others. So, Part II covers how IP packets are carried over the most popular LAN(2) and WAN(3) subnetwork technologies.

Part II begins with a discussion of the IP forwarding decision process. The IP packet header includes a complete destination address, and routers use routing protocols to figure out which outgoing interface is "best," in the sense that it is in the direction of the destination (which will hopefully get the packet closer to its ultimate destination). Every intermediate router uses the same decision process. The differences arise in the subnetwork-specific details of each intermediate subnetwork "hop."

The IP layer is an abstraction, providing the Transport-layer protocols with subnetwork independence. Even though IP makes them all look similar to higher-layer protocols, each subnetwork technology really is quite different from the others.IP runs over an astounding number of physical media, from ArcNet to X.25. In this book, we examine the most common LAN (Ethernet, token ring, and FDDI) and WAN (PPP and Frame Relay) media. Once these have been understood, IP's operation over other media should be much easier to comprehend by generalizing the mechanisms learned here. Subnetwork technologies that are not mentioned here tend to be niche protocols that are not of general interest. (4)

Not only are addressing-related issues understood by a relatively small percentage of the IP users, but the interactions of addressing and routing are similarly poorly understood. In networks with well-coordinated addressing plans, it is possible to greatly minimize the routing table size at the core of the network. Part III contains an overview of routing technology, showing how the two most popular standards-based routing protocols, RIP and OSPF, operate. This part of the book really drives home the interrelationship between addressing and routing, especially in the chapter on interconnection of routing domains.

A well-designed addressing plan eases network troubleshooting because the addresses used within such a network are more meaningful, or may be related to a subnetwork addressing scheme (e.g., in a frame relay WAN). In such a network design, addresses that are "near" each other will have common prefixes, or leading bits, while "far away" numbers have quite different prefixes, making it easy to look at a number and know what part of the network it refers to. It is critically important that those deploying new networks be aware of addressing and routing issues. People sometimes tend to focus on the network applications and forget about the network itself, which, if well-designed will work smoothly for all applications.

The book concludes with a series of Appendices. Appendix A covers ping and traceroute, the two most common IP troubleshooting tools. Appendix B covers the Dynamic Host Configuration Protocol (DHCP), which is frequently used today to ease the administration of IP addresses within a network's defined subnetwork prefixes. Appendix C gives a broad overview of the new IEEE 802.1Q and 802.1p standards, which provide for standardized VLANs, multicast filtering at the MAC layer, class-of-service (CoS) prioritization, and other features. These new features seem poised to make a big impact on the way Ethernet-based networks will be deployed in the future. However, since they are still quite new, it did not seem appropriate to include them in the main chapters on Ethernet.

Acknowledgments
To my wife, Deb, I owe a huge acknowledgment for putting up with a second book right on the heels of the first. I am looking forward to having my spare time back to myself again. I am very grateful to the reviewers, who all offered valuable detailed comments that helped make this book better. Any lingering errors or unclear sections are obviously my responsibility. Once again, I must acknowledge my employer, 3Com. I am especially grateful to Jim Binder, who gave his permission for me to work on this project. Finally, Philippe Byrnes provided valuable moral support, and comic relief when necessary. I look forward to seeing his book(s) published this year.

Many thanks to the team at Prentice Hall PTR, especially Mary Franz, Noreen Regina, and Vince Janoski. Without Mary's constant gentle pressure, this book would not exist. Her patience was considerable, especially considering that this ended up being several months late due to a combination of medical problems and an over-aggressive schedule. Noreen did a great job of making sure that the reviewers' comments made it to me in a timely fashion, and did a great job as "virtual Mary" when necessary. :-) Finally, and very important, Vince Janoski has been doing a great job of managing the whole production process. Once the first draft was done, he took over. Turning 555 pages of double-spaced text into a finished, polished book takes a lot of steps, most of which I am barely aware of.

Vince is making it all happen, and based on the results so far, I'm looking forward to seeing the finished product this Spring!

Finally, I feel that I should thank Dr. Kendra Peterson and Dr. John R. Adler of the Stanford University Medical Center.

Endnotes
1. IP was first deployed in the Internet in 1981.
2. Ethernet, token ring, and FDDI.
3. PPP and Frame Relay.
4. Note that IP over ATM is not specifically covered here in this book for several reasons.

First, when used in PVC mode, ATM is somewhat similar to Frame Relay. Second, IP over ATM is a very broad and complex subject to which whole books have been devoted. Third, IP over ATM LAN Emulation is just the same as IP over Ethernet or token ring, as far as IP is concerned.

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