there is already a monitor interface, returning EOPNOTSUPPīrcmfmac: brcmf_cfg80211_add_iface: iface validation failed: err=-95 When that happens, the following can be seen in dmesg:īrcmfmac: brcmf_vif_add_validate: Attempt to add a MONITOR interface.īrcmfmac: brcmf_vif_add_validate. It is known to happen on the Raspberry Pi, when using airmon-ng. LABEL="persistent_net_generator_end" Interface ath1 created instead of ath0 # build device description string to add a comment the generated rule NAME!="?*", DRIVERS="?*", GOTO="persistent_net_generator_do" # these rules generate rules for persistent network device namingĪCTION="add", SUBSYSTEM="net", KERNEL="eth*|Ath*|wlan*|ra*|sta*" \ The modified version of /etc/udev/rules.d/les is: This is also on Gentoo, both 2.6.19-gentoo-r5 and 2.6.20-gentoo-r6įor Ubuntu, see this Forum posting. Now delete the file /etc/udev/rules.d/les. In other words, you just capitalize the a. You should be able to adapt this solution to your particular distribution.Ĭhange the file /etc/udev/rules.d/lesįrom: KERNEL=“eth*|ath*|wlan*|ra*|sta*……. The source of the problem comes from the udev persistent net rules generator.Įach distro is different… So here is a solution specifically for Gentoo. The answer is in this ticket: Thanks to lucida. This can be confirmed via iwconfig.Īll these problem related to how udev assigns interface names. The second problem is that if you run airmon-ng on wifi0 the athXX created does not show as being shown as in Monitor mode, even though it is. Unloading the madwifi-ng driver, or rebooting the system has no effect, and the number of the interface created by airmon-ng continues to increase. And this continues so in a short period of time it is up to ath56 and continuing to climb. The first is that for each time airmon-ng is run on wifi0 the interface number on ath increases: the first time is ath1, the second ath2, the third ath3, and and so on. The original problem description and solution can be found in this forum thread.Įvery time the command “airmon-ng start wifi0 x” is run, a new interface is created as it should, but there where two problems. Getchipset() Qualcomm Atheros Communications AR9271 802.11n There is NO WARRANTY, to the extent permitted by law. This is free software you are free to change and redistribute it. License GPLv3+: GNU GPL version 3 or later SHELL is GNU bash, version 5.0.3(1)-release (x86_64-pc-linux-gnu)Ĭopyright (C) 2019 Free Software Foundation, Inc. It will give the same information as verbose and add more airmon-ng -debug In this case, the following additional information can be seen: Kwlan0 ath9k_htc-1.4 Qualcomm Atheros Communications AR9271 802.11n mode managed XInterface Driver-FirmwareRev Chipset Extended Info ? indicates we do not know where the driver comes from. S indicates driver comes from the staging tree, these drivers are meant for reference not actual use, BEWARE V indicates driver comes directly from the vendor, almost certainly a bad thing K indicates driver is from 4.19.0-kali4-amd64 If your system does not support VT-d, you can only use USB wifi cards If your system supports VT-d, it may be possible to use PCI devices This appears to be a VMware Virtual Machine It gives information about the system as well as details about the wireless airmon-ng -verbose You can set the channel number by adding it to the end: airmon-ng start wifi0 9 is running then stop them first prior to all the commands above: Other drivers do not show the MAC address of the card. The MAC address of the card is only shown when using the madwifi-ng driver. The access point shows the MAC address of the card. Also make sure the essid, nickname and encryption have not been set. Link Quality=0/94 Signal level=-96 dBm Noise level=-96 dBm Mode:Monitor Frequency:2.452 GHz Access Point: 00:0F:B5:88:AC:82īit Rate=2 Mb/s Tx-Power:18 dBm Sensitivity=0/3 If you want to use ath0 (which is already used):Īth0 Atheros madwifi-ng VAP (parent: wifi0) (VAP destroyed)Īth0 Atheros madwifi-ng VAP (parent: wifi0) (monitor mode enabled) Tx excessive retries:0 Invalid misc:0 Missed beacon:0 Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Link Quality:0 Signal level:0 Noise level:0 Mode:Managed Channel:0 Access Point: Not-Associatedīit Rate:0 kb/s Tx-Power:0 dBm Sensitivity=0/3 It likely looks similar the following output. After starting your computer, enter “iwconfig” to show you the current status of the wireless interfaces. This describes how to put your interface into monitor mode.
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