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

Creating capture filters

Understanding how to use display filters is important. However, capture filters help target only the traffic you want to see. In addition, filtering can remove much of the noise, such as management traffic and ARP broadcasts.

You can create a capture filter in a couple of ways as follows:

  • Go to the center of the startup screen and enter the filter following ...using this filter: as shown in Figure 7.6.
  • Go to the Capture menu and then select Options..., as shown here:

Figure 7.11 – Capture menu dropdown

Once there, you will see capture options, and at the bottom of the dialog box you will see the capture filter area, as shown in the following screenshot:

Figure 7.12 – Location to add a capture filter

Although both options will give you the ability to create a capture filter, I generally go to the Capture menu choice and select Options..., as this will allow me to see all the...