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

Dissecting ICMP and ICMPv6

Although IPv4 and IPv6 are both responsible for routing and addressing data, the two protocols have a number of differences. As a result, there are two versions of ICMP.

In the next section, we'll explore ICMP alongside ICMPv6 so that you understand some of the basic roles and functions in reporting network issues.

Let's start with ICMP, which is used with IPv4.

Reviewing ICMP

ICMP is used alongside IPv4 to communicate network issues that prevent data from being delivered. ICMP error and query messages can alert end systems when there are issues with connectivity and can also obtain diagnostic information from intermediary systems, such as the round-trip time.

As powerful as ICMP is, it cannot make IP a reliable protocol; it only assists in data delivery by providing error messages and information. There are times when the causes of delays in data transmission are outside of the messages that...