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

In this chapter, we outlined the purpose of DNS, reviewed the types of servers, and then compared the way DNS is transported. We then evaluated the types and classes of RRs and then analyzed the structure and information contained within an RR. Next, we examined a DNS packet and drilled down into the header fields and flags, analyzed the packet structure, and reviewed the query section.

By now, you should have a solid understanding of the DNS query and response process and can recognize the TTL value, which indicates how long the value can remain in the cache. In addition, we saw how to examine DNS statistics in Wireshark and how we can test DNS by using tools such as nslookup and dig. We then summarized by discussing potential threats along with general advice on how to secure DNS.

In the next chapter, we will begin by explaining the need for Dynamic Host Configuration Protocol (DHCP) and review the purpose of this essential protocol. So that you understand how an IP...