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airmon-ng [2019/08/17 04:01] – [Error "add_iface: Permission denied"] SVN doesn't exist anymore mister_xairmon-ng [2019/08/18 01:15] – brcmf_cfg80211_add_iface: iface validation failed: err=-95 mister_x
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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 · Last modified: 2022/02/09 00:34 by mister_x