root@bt:~# airmon-ng start wlan0
Found 2 processes that could cause trouble.
If airodump-ng, aireplay-ng or airtun-ng stops working after
a short period of time, you may want to kill (some of) them!
PID Name
1336 dhclient3
1732 dhclient3
Process with PID 1732 (dhclient3) is running on interface wlan0
Interface Chipset Driver
wlan0 Ralink RT2870/3070 rt2800usb - [phy0]
(monitor mode enabled on mon4)
mon0 Ralink RT2870/3070 rt2800usb - [phy0]
mon1 Ralink RT2870/3070 rt2800usb - [phy0]
mon2 Ralink RT2870/3070 rt2800usb - [phy0]
mon3 Ralink RT2870/3070 rt2800usb - [phy0]