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

Chapter 19: Discovering I/O and Stream Graphs

Within Wireshark, there are numerous tools that help the analyst understand what is happening on the network. In this chapter, we'll first review some of the key elements found in the Statistics menu. So that you are aware of the many choices of built-in reports, we'll cover some general information and ways to assess the data found within a capture. We'll also discover several reports that help assess protocol effectiveness, along with a survey of basic graphs found in the Statistics menu.

We'll then focus on two main ways to visualize traffic, by using input/output (I/O) and Transmission Control Protocol (TCP) stream graphs. We'll explore how to create basic I/O graphs to help visualize network issues such as dropped connections, lost frames, and duplicate acknowledgments (ACKs). We'll then compare the four types of TCP stream graphs and learn how each of the graphs can lend insight into the health of...