How to configure WiFi adaptor to monitor mode?

It may work if you first bring the interface down:

sudo ifconfig wlan1 down
sudo iwconfig wlan1 mode monitor

Check:

iwconfig

Not every device and driver combination are capable of monitor mode.

The best way to put your Wifi adapter to monitor mode is through airmon-ng.

You can install it by typing into a terminal sudo apt-get install aircrack-ng

Also, if you are using Wireshark, you have to run it as superuser to be able to put your adapter to monitor mode... :)

Simple first make sure that you have installed drivers for your wireless adapter. Then if you want to enable monitor mode there are 2 methods to do it.

First method is by doing:

• ifconfig wlan0 down
• then airmon-ng check kill
• then type iwconfig mode monitor and then ifconfig wlan0 up
• type service NetworkManager restart before doing ifconfig wlan0 up.

Second way is by doing:

• ifconfig wlan0 down
• then airmon-ng check kill
• then type airmon-ng start wlan0
• then type service NetworkManager restart and ifconfig up.