Make your non-promiscuous WLAN interface promiscuous

Thanks to two easy commands, I was able to make my non-promiscuous WLAN-card promiscuous. The two command are:

  sudo iw dev wlan0 interface add mon0 type monitor
  sudo ifconfig mon0 up

(If 'iw' is not yet installed, install it using "sudo apt-get install iw")

After these commands, I was able to listen promiscuously on open (= unencrypted, non-WEP, non-WPA) WLANs using wireshark and tcpdump.

Alas I can't use mon0 with driftnet and iftop (complaining about not finding an IP address on mon0)