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 12: Discovering ICMP

Everyone is familiar with the Internet Protocol (IP), which is responsible for routing and addressing traffic. However, many are not as familiar with the Internet Control Message Protocol (ICMP), a powerful protocol that plays a major role in delivering data. In this chapter, we'll learn about ICMP, the companion protocol to IP, which works in the network layer of the OSI model. We'll begin with an overview so that you have a general understanding of the main functions of ICMP.

We will then evaluate both ICMP (used with IPv4) and ICMPv6 (used with IPv6) so that you can compare some of the main differences. In addition, you'll get a better understanding of the two types of messages: error reporting and queries. We'll then look at common type and code values, along with a discussion on which types of ICMP messages are no longer used. We'll finish with a discussion on how malicious...