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

Summary

An important concept in establishing a connection-oriented session is to outline the parameters of the conversation before any data is exchanged. In this chapter, we studied how TCP begins a conversation by using a three-way handshake and then took a closer look at each step of the handshake. We saw how, once the handshake is complete, the operating system creates a socket so that data exchange can take place.

In addition, we reviewed the TCP options that are exchanged during the three-way handshake, such as SACK, MSS, and timestamps. This chapter also explained the TCP protocol preferences and outlined how you can modify the TCP preferences in Wireshark. We then finished by seeing how TCP ends a session by exchanging FIN packets that signal each host to close the session.

IP is the other dominant protocol in the TCP/IP suite. In the next chapter, we will take a closer look at IPv4 and IPv6. So that you have a better understanding of this network layer protocol, we&apos...