You're reading from Learn Wireshark A definitive guide to expertly analyzing protocols and troubleshooting networks using Wireshark

Product type Paperback

Published in Aug 2022

Publisher Packt

ISBN-13 9781803231679

Length 606 pages

Edition 2nd Edition

Languages

TCP

Tools

Wireshark

Concepts

Networking

Author (1):

Lisa Bock

View More author details

Table of Contents (28) Chapters

Preface

1. Part 1 Traffic Capture Overview

2. Chapter 1: Appreciating Traffic Analysis FREE CHAPTER

3. Chapter 2: Using Wireshark

4. Chapter 3: Installing Wireshark

5. Chapter 4: Exploring the Wireshark Interface

6. Part 2 Getting Started with Wireshark

7. Chapter 5: Tapping into the Data Stream

8. Chapter 6: Personalizing the Interface

9. Chapter 7: Using Display and Capture Filters

10. Chapter 8: Outlining the OSI Model

11. Part 3 The Internet Suite TCP/IP

12. Chapter 9: Decoding TCP and UDP

13. Chapter 10: Managing TCP Connections

14. Chapter 11: Analyzing IPv4 and IPv6

15. Chapter 12: Discovering ICMP

16. Part 4 Deep Packet Analysis of Common Protocols

17. Chapter 13: Diving into DNS

18. Chapter 14: Examining DHCP

19. Chapter 15: Decoding HTTP

20. Chapter 16: Understanding ARP

21. Part 5 Working with Packet Captures

22. Chapter 17: Determining Network Latency Issues

23. Chapter 18: Subsetting, Saving, and Exporting Captures

24. Chapter 19: Discovering I/O and Stream Graphs

25. Chapter 20: Using CloudShark for Packet Analysis

26. Assessments

27. Other Books You May Enjoy

Chapter 9: Decoding TCP and UDP

Since being standardized in the early 1980s, the Transmission Control Protocol/Internet Protocol (TCP/IP) suite has defined how data is addressed, packetized, transmitted, and routed. Over the years, modifications have been made to the TCP/IP suite to provide more efficiency in today's changing network. This chapter will focus on the TCP portion of the suite, that is, the transport layer (or Layer 4) of the Open Systems Interconnection (OSI) model. Layer 4 has several protocols to transport data; however, we will focus on the most widely used transport layer protocols, TCP and UDP.

In this chapter, we'll begin by reviewing the role and purpose of the transport layer. We'll then take a closer look at TCP, a connection-oriented protocol, and its uses. So that you can easily analyze TCP, we'll examine the header format and field values in detail, such as sequence number, offset, window size (WS), and TCP flags. We'll summarize...