Code:
root@bt:~# airmon-ng start wlan1
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
1436 dhclient
1453 dhclient3
Process with PID 1436 (dhclient) is running on interface wlan0
Process with PID 1453 (dhclient3) is running on interface wlan0
Interface Chipset Driver
wlan1 Realtek RTL8187L rtl8187 - [phy0]
(monitor mode enabled on mon0)