Book Image

Learn Wireshark, - Second Edition

By : Lisa Bock
5 (1)
Book Image

Learn Wireshark, - Second Edition

5 (1)
By: Lisa Bock

Overview of this book

Wireshark is a popular and powerful packet analysis tool that helps network administrators investigate latency issues and potential attacks. Over the years, there have been many enhancements to Wireshark’s functionality. This book will guide you through essential features so you can capture, display, and filter data with ease. In addition to this, you’ll gain valuable tips on lesser-known configuration options, which will allow you to complete your analysis in an environment customized to suit your needs. This updated second edition of Learn Wireshark starts by outlining the benefits of traffic analysis. You’ll discover the process of installing Wireshark and become more familiar with the interface. Next, you’ll focus on the Internet Suite and then explore deep packet analysis of common protocols such as DNS, DHCP, HTTP, and ARP. The book also guides you through working with the expert system to detect network latency issues, create I/O and stream graphs, subset traffic, and save and export captures. Finally, you’ll understand how to share captures using CloudShark, a browser-based solution for analyzing packet captures. By the end of this Wireshark book, you’ll have the skills and hands-on experience you need to conduct deep packet analysis of common protocols and network troubleshooting as well as identify security issues.
Table of Contents (28 chapters)
1
Part 1 Traffic Capture Overview
6
Part 2 Getting Started with Wireshark
11
Part 3 The Internet Suite TCP/IP
16
Part 4 Deep Packet Analysis of Common Protocols
21
Part 5 Working with Packet Captures

Understanding TCP protocol preferences

In Wireshark, there are several protocols that we can modify to display the data, according to our preferences. To modify the way a protocol is displayed, select a header and right-click to view Protocol Preferences, as shown in the following screenshot:

Figure 10.20 – Viewing TCP protocol preferences

At the top of the list of preferences, there is another option, Open Transmission Control Protocol preferences..., which will open the Wireshark preferences, as shown in the following screenshot:

Figure 10.21 – TCP preferences

Once the Preferences dialog box is open, you can select and modify some of the TCP options.

Modifying TCP preferences

When in the preferences dialog box for TCP, you will see a list that outlines your choices, as follows:

  • Show TCP summary in protocol tree: When selected, this option will show a summary of what has transpired in that packet.
  • Validate...