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

Keeping track of the connection

Every version of HTTP has evolved in methods to transport and process data, with techniques such as using persistent connections with a pipelining goal to optimize the connection. In addition, because HTTP is a stateless protocol, cookies are used to maintain client information about the connection, such as shopping cart elements and pages the client has visited.

In this segment, we'll compare the different methods of making and maintaining a connection, along with how cookies are used to preserve state information. Let's start by comparing connection types.

Evaluating connection types

When HTTP version 1.0 was developed, it had minimal functionality and used a non-persistent connection. With the introduction of version 1.1, several enhancements were added. One of the improvements was the ability to keep the data moving by using a persistent connection.

Let's start by understanding the mechanics of a non-persistent connection...