Book Image

Mastering Wireshark 2

By : Andrew Crouthamel
Book Image

Mastering Wireshark 2

By: Andrew Crouthamel

Overview of this book

Wireshark, a combination of a Linux distro (Kali) and an open source security framework (Metasploit), is a popular and powerful tool. Wireshark is mainly used to analyze the bits and bytes that flow through a network. It efficiently deals with the second to the seventh layer of network protocols, and the analysis made is presented in a form that can be easily read by people. Mastering Wireshark 2 helps you gain expertise in securing your network. We start with installing and setting up Wireshark2.0, and then explore its interface in order to understand all of its functionalities. As you progress through the chapters, you will discover different ways to create, use, capture, and display filters. By halfway through the book, you will have mastered Wireshark features, analyzed different layers of the network protocol, and searched for anomalies. You’ll learn about plugins and APIs in depth. Finally, the book focuses on pocket analysis for security tasks, command-line utilities, and tools that manage trace files. By the end of the book, you'll have learned how to use Wireshark for network security analysis and configured it for troubleshooting purposes.
Table of Contents (18 chapters)
Title Page
Copyright and Credits
Packt Upsell
Free Chapter
Installing Wireshark 2

ICMP analysis

In this section, we'll take a look at how ICMP is useful to network engineers and what some of the different types of ICMP are and what they mean.

The first thing we will do is create some ICMP packets. For that we will create a ping request, which is a type of ICMP.

So, let's go ahead and start the capture, and we'll go ahead and ping Google again:

Each one of the replies is a series of ICMP requests and responses.

Stop the capture and we'll apply an icmp display filter:

As shown in the preceding screenshot, these are all of my ICMP packets that have been sent and received, and we can see that we have multiple requests and replies. This coincides with the four replies that we saw in the command line.

If we dive into the header, by going down to the very bottom in the packet details—that is, to Internet Control Message Protocol, we can see that we have Type and Code:

Type and Code are the two important parts within ICMP. We see we have Type 8: (Echo (ping) request). Then, in the next...