Using Wireshark to Analyze and Troubleshoot Wi-Fi Networks

Wi-Fi is the most prevalent wireless network deployed worldwide. This course teaches you how to capture Wi-Fi traffic, analyze Wi-Fi capture in Wireshark, and troubleshoot complex problems in Wireshark, including 802.1X authentication and QoS.
Course info
Level
Intermediate
Updated
Jul 12, 2017
Duration
4h 19m
Table of contents
Course Overview
How to Get the Most out of This Course
How to Capture Wireless Network Traffic
What You Need to Know Before You Capture Wireless Traffic
Key Fields to Analyze in Your Wireless Packet Capture
What Network Traffic Tells You About Your Wireless Configuration
Analyzing and Troubleshooting Client Connectivity Issues
Analyzing and Troubleshooting Wi-Fi QoS Issues
Using Wireshark Statistics to Analyze Wireless Networks
Description
Course info
Level
Intermediate
Updated
Jul 12, 2017
Duration
4h 19m
Description

Are you responsible for designing, implementing or managing a Wi-Fi network? Or simply want to understand how Wi-Fi works? In this course, Using Wireshark to Analyze and Troubleshoot Wi-Fi Networks, you'll learn how to capture, analyze, and troubleshoot Wi-Fi networks in Wireshark. First, you'll learn how to capture Wi-Fi traffic over-the-air, including how to select the best hardware, and how to configure that hardware in your preferred OS environment. Next, you'll explore how Wi-Fi is the only protocol where Wireshark provides physical layer information utilizing the de facto Radiotap standard. Additionally, you'll discover the 802.11 MAC header and elements, learning how to filter on key fields, such as the retry flag to find re-transmitted frames, and the protected flag to determine if your network traffic conforms to your security policies. Lastly, you'll cover the 802.11e Quality of Service (QoS) setting and how to ensure your traffic is being given the appropriate priority over the Wi-Fi network. By the end of this course, you'll have the necessary skills and knowledge to navigate Wireshark to analyze and troubleshoot your Wi-Fi networks with confidence.

About the author
About the author

Dr. Salter is a consultant, writer and technical trainer with over 20 years of industry experience in deploying networks and managing IT operations.

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Section Introduction Transcripts
Section Introduction Transcripts

Course Overview
Hi! My name is Dr. Avril Salter, and welcome to my new course titled, Using Wireshark to Analyze and Troubleshoot Wi-Fi Networks. I am an independent consultant, and I have been working on wireless LANs since I first came to the United States back in the 90s. Today, Wi-Fi has permeated every part of our lives. For instance, before I even get up in the morning, I check my email, my text messages, and my calendar over my home Wi-Fi network. When I'm at my customer's office, I can stay connected whether I'm working at a desk or in a conference room or in the cafeteria, at public places like shopping malls, my favorite coffee shops and restaurants, all of them provide Wi-Fi connectivity, even my car has Wi-Fi and allows all of my gadgets to stay connected when I drive between different locations. Wi-Fi has been around since the 90s, and it continues to evolve. Historically, Wi-Fi provided network connectivity for computers. It's then evolved to support things like smartphones and tablets and eBook readers. Increasingly, it's providing connectivity as part of the Internet of Things. The great thing about Wi-Fi is that you can simply plug it in, turn it on, and you can connect to the network. The bad thing is that in Wi-Fi networks, if it's not deployed correctly, the performance can be quite poor. If you're an IT professional or even frustrated with how Wi-Fi works in your home, this course is for you. In this course, you're going to learn how to capture wireless traffic over the air. You're going to learn how to understand the content of that packet capture. And you're going to learn how to use Wireshark to do a deep dive analysis of that packet capture and to troubleshoot your most complex Wi-Fi issues. Radio waves may be invisible to the eye, but you'll be able to see the traffic that's going over the air. How cool is that?