How to enable monitor mode on your wireless interface

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By default, your wireless interfaces are set to 'Managed' mode. A wireless interface set to 'Managed' mode can only capture packets with a 'Destination MAC' set to its own MAC address.

If you want to be able to capture all packets within the range of your wireless device, you need to set the mode of your wireless interface to 'Monitor'.

However, not all wireless devices support monitor mode, so you will need to check that your device is compatible.

Quick guide

If you have Aircrack-ng installed, you can run the following commands in your terminal:

  1. Run airmon-ng to list all your network interfaces.
  2. Run arimon-ng check kill to stop interfering network processes.
  3. Run airmon-ng start wlan0 to start your network interface in monitor mode, in this case we are using wlan0.

If you are not using Aircrack-ng, you can run the following commands in your terminal:

  1. Run iwconfig to view your wireless interfaces and check their current mode.
  2. Run ifconfig wlan0 down to disable the network interface you wish to change, in this case it is wlan0.
  3. Run iwconfig wlan0 mode monitor to change the mode of wlan0 to 'monitor'.
  4. Run ifconfig wlan0 up to re-enable your network interface.

You may need to run these commands as root or a user with privileges.

Once you have re-enabled your network interface, you can run iwconfig to confirm your wireless interface is running with 'Monitor' mode:

wlan0     IEEE 802.11b  ESSID:""  Nickname:"<WIFI@REALTEK>"
            Mode:Monitor  Frequency:2.412 GHz  Access Point: Not-Associated

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