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

Demonstrating frame formation in Wireshark

Once you understand encapsulation and frame formation, you will be able to learn how Wireshark represents frame formation, as shown in the following screenshot:

Figure 8.10 – Frame formation in Wireshark

Note

Not all frames contain data; however, this one does, so it's a good example of a fully encapsulated frame.

When looking at a single frame, you will see at the top of Figure 8.10, the Frame 4371 line, which is the metadata about that single frame that summarizes the contents of the frame. The metadata for this frame includes information such as 401 bytes on wire and 401 bytes captured.

After the frame metadata, you will have the following:

  • Frame: The frame header shows Ethernet II, and after that are the source and destination MAC addresses.
  • Packet: The IP header represents the Network layer, which holds the source and destination IP addresses.
  • Segment: The TCP header represents...