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

Analyzing latency issues

Today, there are many different types of devices that communicate and exchange information across the network, which include intermediary devices, the Internet of Things (IoT), and mobile devices. All of those, along with the many other types of traffic that are added to the network on a daily basis, can make network administration challenging.

Because of these factors, there are multiple reasons why packet loss and slow response times occur. Once it's determined that there is an issue, the troubleshooting process begins.

When troubleshooting connectivity issues, there are many approaches. All have the same goal: identify the trouble spots and narrow the scope to determine the root cause of the problem. Root causes can include misconfiguration, malware, or even hardware malfunction. In the following sections, we will analyze some of the root causes behind network delays and discuss three main concepts: latency, throughput, and packet loss.

Grasping...