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

Comparing types and classes of RRs

At the heart of DNS are RRs, which include information on the name, type, Time to Live (TTL), and IP address of the requested resource. In this section, we'll review some of the different types of RRs, along with examining the structure of one.

Let's start by reviewing some of the different types of RRs.

Breaking down DNS types

Whenever you send a request to a DNS server, the request will include the type of record to return. Although there are many types of DNS RR, we'll take a look at some common types, as shown in the following table:

Table 13.1 – The types of DNS RRs

As shown, these are common records; however, there are more. For a comprehensive list of DNS types, visit https://phoenixnap.com/kb/dns-record-types.

Note

An AAAA-type RR, which is an IPv6 address, is also called a Quad A. This type uses four As because an IPv6 address is four times the length of an IPv4 address.

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