Airmon-ng
Airmon-ng is a convenient way to enable and disable monitor mode on various wireless interfaces.
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# Displays the status and information about the wireless interfaces
airmon-ng
# List programs that can interfere with aircrack-ng suite
sudo airmon-ng check
# Kill processes that can interfere with aircrack-ng suite
sudo airmon-ng check kill
# Create an interface (wlan0mon) in monitor mode from an existing one (wlan0)
sudo airmon-ng start wlan0
# Stop monitor mode
sudo airmon-ng stop wlan0
# Start monitor mode only on channel 2 (only do this when the tool that will be used next doesn't change channels itself)
sudo airmon-ng start wlan0 2
# manually set channel
iw dev wlan0 set channel 13
# Check that we changed the channel correctly
sudo iw dev wlan0 info
# verbose and debug mode
sudo airmon-ng --verbose
sudo airmon-ng --debug