Deauthentication Attack

Disconnects any client from any network.

• Works on encrypted networks (WEP, WPA, WPA2)
• No need to know the network key/password/passphrase.
• No need to connect to the network.

You can find a detailed explanation for Deauth Attacks here Concept of De-authentication Attack.

Requirements:

• Need Kali Linux installed as a host or as a virtual machine. We generally use Kali Linux as a Virtual Machine. Check this link for how to Install Kali Linux in Virtual Machine.
• Get the MAC Address/BSSID for the router/access point. Check the section How to scan nearby wireless networks of the post Wireless Network Sniffing.
  
• If want to attack a person get the MAC Address/BSSID of the target. Check the section How to scan a specific network of the post Wireless Network Sniffing to get the MAC of a particular person.
• Wireless Adapter which supports Monitor Mode. We are using ALPHA AWUS036NHA which has an Atheros AR9271 chipset.
• Your wireless adapter should be in Monitor Mode. Check this link for how to Enable Monitor Mode for Wireless Adapter.
• It's good practice to change your MAC Address before scanning. Check this link for how to Change MAC Address in Kali Linux.

Deauth Attacks

How to deauth everyone from a network

In the terminal, type:

• Syntax: 

aireplay --deauth <no._of_packets> -a <AP_MAC> <adapter_name> 

• --deauth: to tell it's a de-authentication attack. Instead of --deauth you can type -0.
• <no._of_packets>: specifies how many numbers of packets you want to send for deauth. 0 (Zero) means infinite or send packet continuously.
• -a: is an option where you need to specify Target's router MAC Address.
• <adpater_name>: type the adapter which is in monitor mode.
• Example: 

        aireplay --deauth 0 -a e2:33:44:55:66:77 wlan0

• Sending infinite packets to the router's mac address (e2:33:44:55:66:77) using the wireless adapter (wlan0) which is in monitor mode.

How to deauth specific devices from a network

In the terminal, type:

• Syntax: 

aireplay -0 <no._of_packets> -a <AP_MAC> -c <target's_mac> <adapter_name>

• -0: is the short version of writing --deauth.
• -c: is an option where you need to specify Target's Device's MAC Address.
• Example: 

aireplay -0 0 -a e2:33:44:55:66:77 -c e2:22:33:44:55:66 wlan0  

• Sending infinite packets to Target's Device (e2:22:33:44:55:66) which is connected to the router (e2:33:44:55:66:77) using the wireless adapter (wlan0) which is in monitor mode.

Video Tutorial 

We hope this helps. If any suggestions or doubts you can add a comment and we will reply as soon as possible.