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airmon-ng [2019/08/17 04:01]
mister_x [Error "add_iface: Permission denied"] SVN doesn't exist anymore
airmon-ng [2019/08/18 01:15] (current)
mister_x brcmf_cfg80211_add_iface: iface validation failed: err=-95
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   ​   ​
 See also http://​ubuntuforums.org/​showthread.php?​t=1311886 See also http://​ubuntuforums.org/​showthread.php?​t=1311886
 +
 +==== ERROR adding monitor mode interface: command failed: Operation not supported (-95) ====
 +
 +It is known to happen on the Raspberry Pi, when using [[airmon-ng]]. When that happens, the following can be seen in dmesg:
 +
 +  brcmfmac: brcmf_vif_add_validate:​ Attempt to add a MONITOR interface...
 +  brcmfmac: brcmf_vif_add_validate:​ ... there is already a monitor interface, returning EOPNOTSUPP
 +  brcmfmac: brcmf_cfg80211_add_iface:​ iface validation failed: err=-95
 + 
 +There may be instances of the following in dmesg as well prior to the above output:
 +
 +  brcmfmac: brcmf_vif_add_validate:​ Attempt to add a MONITOR interface...
 +  brcmfmac: brcmf_mon_add_vif:​ brcmf_mon_add_vif called
 +  brcmfmac: brcmf_mon_add_vif:​ Adding vif "​wlan0mon"​
 +  brcmfmac: brcmf_cfg80211_get_channel:​ chanspec failed (-52)
 +
 +Even though dmesg says the interface is already in monitor mode and "iw dev wlan0 info" confirms it is, [[airodump-ng]] will fail and report the interface data linktype is Ethernet. This is a bug in the driver and/or firmware, and the workaround is to reboot the system or to reload the driver:
 +
 +  rmmod brcmfmac
 +  modprobe brcmfmac
airmon-ng.txt ยท Last modified: 2019/08/18 01:15 by mister_x