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Learn Wireshark

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

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Product type Paperback
Published in Aug 2022
Publisher Packt
ISBN-13 9781803231679
Length 606 pages
Edition 2nd Edition
Languages
Concepts
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Author (1):
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Lisa Bock Lisa Bock
Author Profile Icon Lisa Bock
Lisa Bock
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Toc

Table of Contents (28) Chapters Close

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

Learning TCP options

While TCP is already an amazing protocol, it also permits various options that can be added to the TCP header to extend the functionality. The complete list, last updated in February 2021, can be found at https://www.iana.org/assignments/tcp-parameters/tcp-parameters.txt.

Keep in mind the following about TCP options:

  • Not all options are used.
  • Some of the options are experimental.
  • Some are used for specific reasons and do not have an associated Request for Comment (RFC).
  • Some have been developed and used without the proper Internet Assigned Numbers Authority (IANA) assignment.

The seven most common options are listed in the following table:

Table 10.1 – TCP options

The first three, EOL, NOP, and MSS, are from the original TCP RFC 793. The others were developed over time. Any options will follow the TCP header and are in multiples of 8 bits (or 1 byte). The entire header must be a multiple of 32 bits...

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