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

TCP/IP overview

In this section, we'll take a look at the basics of TCP/IP, how packets are built, and the resolution processes that are in place, such as DNS and ARP.

In networking, we have two models that we commonly use: OSI and TCP/IP. As shown in the following diagram, on the left side we have the OSI model and on the right side we have TCP/IP model, and I've tried to match them up so that you can see how the different layers of each model line up with each other:

When we use Wireshark, we're commonly concerned with layers 2 through 7 of the OSI model. And most commonly when you use Wireshark, it's probably because something that's often application-related is going on or the system is running an application. Most commonly, you'll find yourself using Wireshark to diagnose problems that are in the upper layers, especially layer 7. But you can certainly use it to troubleshoot connectivity issues between devices on layer 3 or layer 2. While there are a number of TCP/IP services and protocols...