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After installing Kali Linux on a USB Stick with persistence enabled and live booting it (via refind) on my macbook pro (late 2015) the wifi did not work. I found out how to install the right drivers from git.kernel.org and this enabled using wifi.

Still monitor mode does not work.

When I try it with 'airmon -ng start wlan0' for example to get the interface into monitor mode, I get the following error.

phy0    wlan0        brcmfmac    Broadcom Corporation Device 43ba (rev 01)
Failed to set wlan0mon up using ip
command failed: No such device (-19)

        (mac80211 monitor mode vif enabled for [phy0]wlan0 on [phy0]wlan0mon)
command failed: Operation not supported (-95)
        (mac80211 station mode vif disabled for [phy0]wlan0)

(After checking with iwconfig the interface is still in managed mode.)

According to this site, if I got it right, (search for monitor mode) the brcmfmac driver, which I am using, does not support monitor mode yet.

  • Is it possible to find a way to make it work anyways?

  • Can I maybe use another driver instead? Or add support for monitor mode myself?

Thanks a lot, any help is really appreciated, because I am totally stuck.

( Chipset BCM43602 PCI Device ID 14e4:43ba Driver name brcmfmac43602-pcie.bin )

  • Why kali?; What is your use case? – ctrl-alt-delor Jul 9 '18 at 7:02
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You are correct that the card doesn't support monitor mode, but there is a work around. You actually have to run echo 1 | sudo tee /proc/brcm_monitor0 which will create another interface called prism0, you can confirm this by re-running ifconfig you then will run an airodump-ng prism0 to begin capturing packets. You will need to do this every time you want to put the card into "monitor mode"

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    with a configuration provided in the question i.e. brcmfmac driver, trying to write to /proc/brcm_monitor0 gives No such file or directory error. – ciekawy Jan 3 '17 at 17:23
  • and according to the brcmfmac wiki monitor mode is not supported – ciekawy Jan 3 '17 at 17:28
  • prism is another brand. maybe you have got a wifi stick, which is not the OP case. – Rui F Ribeiro May 6 '17 at 18:08
  • I just checked and nope no wifi stick, just the builtin Broadcom. The directions are here pentestmac.wordpress.com/tag/macbook-wireless-monitor-mode . Prism0 is an alias interface. – user52470 May 7 '17 at 0:14
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The BCM43602 definitely support monitor mode. It works on macOS. Here is simple utility for macOS to dump wireless traffic: airport-sniffer. It works successfully with BCM43602. You can also turn on monitor mode on macOS with Wireless Diagnostics.app.

During to this wiki https://wireless.wiki.kernel.org/en/users/drivers/brcm80211 only brcm(s)mac support monitor mode. But BCM43602 uses brcm(f)mac driver that not support monitor mode. So looks like monitor mode not supported in Linux yet.

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