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

Recognizing the purpose of DHCP

Every host on the network must have a unique IP address to communicate with other network hosts. Some hosts, such as servers and printers, have a hardcoded IP address since they don't want the IP address to change. However, the vast majority of hosts have a dynamically assigned IP address.

DHCP is a method that's used on a network to provide configuration information to hosts on a network. In addition to providing an IP address, most responses provide additional information. This information can include the Domain Name Service (DNS) server's IP address and Network Time Protocol (NTP), which provides the time service for the network.

DHCP lets you conserve IP addresses on a busy network. It also removes the need for the tedious and unnecessary hardcoding of individual IP addresses.

DHCP is a client-server model, where hosts request an IP address, and the server responds with an IP address that is leased for a period. The lease...