Good Evening friends. Today we will learn how to perform Wifi DOS attack on Wifi networks. We will use a tool called mdk3 which is inbuilt in Kali Linux and we need a compatible wifi adapter for this attack. A Dos attack stands for Denial Of Service attack. If all is set, open a terminal and type command “mdk3” to see various attacks available in this tool as shown below.
New to Ethical Hacking?
Start your journey with The Beginner Ethical Hacker Starter Kit (2026 Edition).
Inside the free guide, you’ll learn:.
- Ethical hacking fundamentals
- Beginner cybersecurity roadmap
- Essential hacking tools
- Common vulnerabilities explained

Scroll down to see more options. We can see the various testing modes available in this tool. We will use the deauthentication attack for this Wifi DOS. As the name implies, this attack disconnects all clients connected to the wifi network.

Before we start our attack, we have to start our adapter in monitor mode. Type command “airmon-ng start wlan0“. (where wlan0 is your wifi interface and may differ for you).
Want to Learn Ethical Hacking Step-by-Step?
If you’re serious about learning cybersecurity, a structured roadmap makes the journey much easier.
Download The Beginner Ethical Hacker Starter Kit (2026 Edition) and discover:
✔ The ethical hacking learning path
✔ Beginner-friendly security concepts
✔ Essential tools ethical hackers use
✔ The most common vulnerabilities explained

Then type command “mdk3 mon0 d -i <ESSID name>” and you will see the tool disconnecting all the clients connected to the Wifi network you are targeting. Here,
“mon0” – is the interface where monitor mode has been started. This can be different for you.
d – is the de authentication mode
ESSID – is the name of the Wifi network.

Hope this was helpful. Learn how to crack wifi passwords.
Start Your Ethical Hacking Journey Today
Learning cybersecurity can feel overwhelming at first. The best way to start is with a clear roadmap and the right resources.
Download The Beginner Ethical Hacker Starter Kit (2026 Edition) and get instant access to:
✔ Ethical hacking fundamentals
✔ A beginner cybersecurity learning roadmap
✔ Essential hacking tools every beginner should know
✔ Common vulnerabilities explained simply

