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

Understanding the role and purpose of ARP

ARP is one of the three main network layer protocols (ARP, IPv4, and Internet Control Message Protocol (ICMP)), all of which are essential in delivering data. 

In the following diagram, we see that ARP is actually in between Layer 3 and Layer 2 of the Open Systems Interconnection (OSI) model, as ARP resolves an IP address (network layer) to a MAC address (data link layer):

Figure 16.1 – The OSI model network layer protocols

Note

Although ARP resides in between Layer 2 and Layer 3 of the OSI model, many consider ARP as a Layer 3 protocol.

In this section, we'll see how ARP resolves a MAC address. We'll then learn how the ARP cache helps provide a speedier response. In addition, we'll discover how an IPv6 network uses the Neighbor Discovery Protocol (NDP) to resolve an IPv6 address to a MAC address.

On a LAN using IPv4, the frame header must use a MAC...