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

DHCP is an essential protocol that's used on nearly all LANs. When it's configured properly, DHCP is a seamless way to assign IP addresses, with little or no intervention. In this chapter, we covered the purpose of DHCP and learned about its impressive role in supplying a host with an IP address, along with configuration details. We discovered the role of a relay agent, outlined the various ways IPv6 obtains an IP address, and briefly discussed security issues when working with DHCP.

Then, we looked at the DORA process – discover, offer, request, and acknowledgment – and examined the mechanics of the DHCP lease time. You should now have a better understanding of the DHCP header field values, along with the types of messages. In addition, you should be able to recognize the various DHCP options. We summarized this by bringing everything together and stepping through a DHCP example. We moved from the initial broadcast on the network, to the offer and...