This is what I get when starting airodump-ng

root@guido-laptop:/home/guido# airodump-ng wlan0
ioctl(SIOCSIWMODE) failed: Device or resource busy

ARP linktype is set to 1 (Ethernet) - expected ARPHRD_IEEE80211,
ARPHRD_IEEE80211_FULL or ARPHRD_IEEE80211_PRISM instead. Make
sure RFMON is enabled: run 'airmon-ng start wlan0 <#>'
Sysfs injection support was not found either.
  • "Device or resource busy" Seems to indicate that you're using this network device. Does it help to shut down the Network Manager (sudo stop network-manager)? Try again after that and if that still fails, follow the suggestion in the error message you posted. – gertvdijk Jun 26 '13 at 23:07
  • 2
    I predict your next question to be negative one channel bug. – RobotHumans Jun 27 '13 at 0:22

You're trying to start airodump on a non-monitor interface.

Airodump requires that you run it on a monX interface just like the error message tells you to do. I'm working on a python conversion for everything but the cracking. In the mean time, read the directions and run airmon-ng start wlan0 to fix your problem.

It's a little upsetting when the answer is in the error message in the question in total...

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