Results 1 to 4 of 4

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

  3. #3
    Join Date
    2015-Sep
    Posts
    9
    I ran into issues with my card today not injecting properly. I finally found this:

    https://github.com/aircrack-ng/rtl8812au/issues/819

    The second comment contains a patch that makes injecting management frames work again.

    In short I did the following:

    • Uninstall the Kali package - realtek-rtl88xxau-dkms
    • git clone https://github.com/aircrack-ng/rtl8812au/
    • In the new rtl8812au directory - download and place the patch referenced in the above issue 819
    • patch -p1 < 0001-Allow-inject-management-and-control-frames.txt
    • make dkms_install
    • I like to reboot here to make sure everything in module land is kosher

    After doing this I can now deauth as I could before.

  4. #4
    Join Date
    2015-Sep
    Posts
    9
    So a few updates on this.

    Looks like the aircrack repo has this patch officially integrated and committed:

    https://github.com/aircrack-ng/rtl88...f989a99c6f3dbe

    That commit was on 1/29/21. Looks like the Kali package for this driver is using sources from 1/18/2021. So the Kali package needs a bump to include this (very important) fix:

    https://pkg.kali.org/news/439995/rea...-kali-rolling/

    So until the realtek-rtl88xxau-dkms package gets bumped to use a more recent/current git snapshot, you'll still need to do what I had in my previous post. However, no need to do the patch anymore as it's been committed.

Similar Threads

  1. Realtek RTL8811AU Monitor mode issues on Kernel 5.4
    By ovikintobor in forum Kali Linux TroubleShooting
    Replies: 3
    Last Post: 2021-01-02, 17:51
  2. Alfa AWUS036ACS Not Working as Intended
    By codemel in forum General Archive
    Replies: 2
    Last Post: 2019-12-04, 13:50
  3. Replies: 2
    Last Post: 2015-09-09, 20:10

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •