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Volume two of this series, TCP/IP Illustrated, Volume 2: The Implementation, covers the implementation of TCP/IP. Volume three explores TCP for Transactions, HTTP, NNTP, and the Unix Domain Protocols.
TCP/IP Illustrated is a complete and detailed guide to the entire TCP/IP protocol suite-with an important difference from other books on the subject. Rather than just describing what the RFCs say the protocol suite should do, this unique book uses a popular diagnostic tool so you may actually watch the protocols in action.By forcing various conditions to occur-such as connection establishment, timeout and retransmission, and fragmentation-and then displaying the results, TCP/IP Illustrated gives you a much greater understanding of these concepts than words alone could provide. Whether you are new to TCP/IP or you have read other books on the subject, you will come away with an increased understanding of how and why TCP/IP works the way it does, as well as enhanced skill at developing applications that run over TCP/IP.
With this unique approach, TCP/IP Illustrated presents the structure and function of TCP/IP from the link layer up through the network, transport, and application layers. You will learn about the protocols that belong to each of these layers and how they operate under numerous implementations, including Sun OS 4.1.3, Solaris 2.2, System V Release 4, BSD/386TM, AIX 3.2.2, and 4.4BSD.In TCP/IP Illustrated you will find the most thorough coverage of TCP available - 8 entire chapters. You will also find coverage of the newest TCP/IP features, including multicasting, path MTU discovery, and long fat pipes.
"While all of Stevens' books are excellent, this new opus (TCP/IP Illustrated, Volume 1) is awesome. Although many books describe the TCP/IP protocols, the author provides a level of depth and real-world detail lacking from the competition."
- Unix Review
"This book (TCP/IP Illustrated, Volume 1) is a stone jewel...Written by W. Richard Stevens, this book probably provides the most comprehensive view of TCP/IP available today in print."
- Boardwatch
"The diagrams he uses are excellent and his writing style is clear and readable. Please read it (TCP/IP Illustrated, Volume 1) and keep it on your bookshelf."
- Sys Admin
"The word 'illustrated' distinguishes this book (TCP/IP Illustrated, Volume 1) from its many rivals. Stevens uses the Lawrence Berkeley Laboratories tcdump program to capture packets in promiscuous mode under a variety of OS and TCP/IP implementations. Studying tcdump output helps you understand how the various protocols work."
- Unix Review
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In chapter 1, the author gives a brief overview of protocol layering, Internet addressing, and the domain name system. The encapsulation mechanisms for TCP and UDP are outlined as well as a discussion of the different implementations of TCP/IP. The Vegas implementation is not discussed since it was invented long after the date of publication of this book. Ethernet and the encapsulation provided by IEEE, SLIP, and PPP is discussed in the next chapter on the link layer, along with the loopback interface and MTU. Estimates are given of serial line throughput, setting the stage for later timing calculations.
The IP protocol is the subject of chapter 3, the author stressing first the connectionless and unreliable nature of IP packet transfer. The IP datagram format is given in discussed, along with a detailed discussion of subnet addressing and subnet masks. The discussion of IP given here is of course very out of date with the advent of IPv6.
Chapter 4 is an overview of ARP, and the author illustrates it effectively using an example of an FTP transfer and Telnet. This is followed by a treatment of RARP in the next chapter, with the limitations of this protocol briefly discussed. Although ARP is incorporated in all current implementations of TCP/IP (with the exception of IPv6), not all of these include RARP.
The ICMP error handling protocol is discussed in the next chapter, with all the message types listed, and brief discussions given of timestamp and address mask requests. This is followed naturally by a discussion of the Ping program in chapter 7, which uses ICMP echo request and reply messages.
The traceroute program, which finds which path IP packets follow from one to the other, is discussed in Chapter 8. An explicit example is given of how to use traceroute. Then in the next chapter, IP routing is discussed, along with an explicit example of a routing table. Again, the discussion is out-of-date, since in IPv6, the router discovery is replaced by a mandatory router solicitation and advertisement mechanism.
Dynamic routing protocols are the subject of the next chapter, wherein the author discusses RIP, OSPF, BGP, and CIDR. The newer ones, such as IGRP, EIGRP, and MPLS, are of course not treated.
UDP is then discussed in the next chapter, with examples given and IP fragmentation discussed, along with a brief overview of how UDP and ARP interact. This is followed in Chapter 12 by a discussion of broadcasting and multicasting, and the author outlines briefly the problems that rise when attempting to broadcast through routers. Then in the next chapter, the ICMP mechanism for multicasting is discussed. Here again the treatment is dated, since in IPv6 IGMP is replaced by multicast listener discovery messages and there are no broadcast addressing in IPv6.
The DNS database is discussed in the next chapter, with emphasis on how resolvers communicate with name servers using TCP/IP. The discussion is limited to A resource records, which is replaced in IPv6 with AAAA or A6 resource records. I did not read the next two chapters on TFTP and BOOTP so I will omit any commentary.
It is in the next chapter that the basics of TCP begin to be discussed, with the details of the TCP header given. The dynamics of the TCP connection is then treated in chapter 18, with a complete TCP state transition diagram given. The discussion is very helpful to those who need a thorough understanding of the connection steps in TCP. This is followed by a treatment of the Nagle algorithm and delayed ACKs in chapter 19. The exercises in this chapter need to be worked to appreciate the discussion.
The following chapter overviews how TCP sliding windows work, and how window sizing is done. Slow start, the bandwidth-delay product, and the urgent mode are all treated in great detail. The mathematical considerations behind TCP timeout and retransmission are given in chapter 21, along with a discussion of the congestion avoidance algorithm and the fast retransmit and fast recovery algorithms. Then in chapter 22, the TCP persist timer, used to prevent transmission deadlock and the silly window syndrome, is discussed in detail. The ability of TCP to implement a keepalive timer is discussed in the next chapter. Since it is out of date, I did not read the next chapter on the future of TCP.
The SNMP network management protocol is outlined in Chapter 25, with definitions of MIB and an overview of SNMP traps. These are very important concepts given the enormous importance of network management currently. There are currently several vendors that supply packages for polling, reporting, and forecasting network behavior that are based partially on SNMP and MIBs.
Telnet and Rlogin, which are still used extensively in modern networks, are discussed in the next chapter. After reading this chapter, the reader will have a thorough understanding of how these protocols work, which is also true of the next chapter that covers the FTP protocol, and the SMTP protocol, which is covered in chapter 28. I did not read the last two chapters of the book so I will omit any commentary.
The author has done a good job here of relating to the reader the structure and dynamics of TCP/IP based on what was known at the time. In view of the fact that IPv4 is still alive and well, and given that TCP implementations have only been slightly modified since 1994, one can still read this book profitably.