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Thread: Alfa AWUS036ACS - Realtek RTL8811AU not working in monitor mode

  1. #1
    Join Date
    2016-Feb
    Posts
    12

    Alfa AWUS036ACS - Realtek RTL8811AU not working in monitor mode

    Hi,

    I have just purchased a new Alfa AWUS036ACS USB WiFi adapter to replace an exiting Alfa AWUS036NEH which was only 2.4 Ghz.

    The new card ( 36ACS ) seems to have an issue with not working properly in monitor mode. I installed drivers from this link
    HTML Code:
    http://downloads.fars-robotics.net/wifi-drivers/install-wifi
    which has loaded the adapter and i now get an wlan0 interface although it has used the 8812au driver

    I was originally running kernel 4.19 but have upgraded to 5.4 to see if it makes any difference which it doesn't. I have also noticed that if i down the interface, set the mode to monitor via
    PHP Code:
    iwconfig wlan0 mode monitor 
    and bring it back up again, then run iw dev the interface is still shown as managed. However if i run
    PHP Code:
    iw wlan0 set monitor none 
    the interface does then show as monitor mode but still no packets captured.

    There seems to be a couple of posts here saying they have had similar issues but according to the various reports plus
    PHP Code:
    iw phy 
    the adapter does support monitor mode. I presuming the issue is driver related.

    Has anyone had a similar issue and managed to get the adapter working, if so how ?

    Thanks

  2. #2
    Join Date
    2013-Mar
    Posts
    8
    For setting properly monitor mode check this link:

    https://github.com/aircrack-ng/rtl8812au/tree/v5.6.4.2

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