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I am trying to get the a realtek USB wifi dongle working on my PC.

When I run lsusb - it is visible.

0bda:0811 Realtek Semiconductor Corp.

System Version Information

LSB Version: :core-4.1-amd64:core-4.1-noarch Distributor ID: CentOS Description: CentOS Linux release 7.6.1810 (Core) Release: 7.6.1810 Codename: Core

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Googling on 0bda:0811 reveals that the WiFi chip in the dongle is Realtek RTL8812au.

Apparently you may need to build the 8812au driver from source code.

Here seems to be Centos7-specific compilation instructions:

$ yum install -y git gcc kernel-devel
[snip]
$ git clone git@github.com:gnab/rtl8812au.git
Cloning into 'rtl8812au'...
[snip]
$ cd rtl8812au
$ make
[snip]
  LD [M]  /home/steve/wifi/rtl8812au/8812au.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /home/steve/wifi/rtl8812au/8812au.mod.o
  LD [M]  /home/steve/wifi/rtl8812au/8812au.ko
make[1]: Leaving directory `/usr/src/kernels/3.10.0-514.6.2.el7.x86_64'

If this is successful, you can now try loading the module:

$ sudo insmod 8812au.ko

Apparently the WiFi adapter name may use the en prefix instead of the expected wl. If your system does not crash and e.g. ip addr command (or the NetworkManager desktop widget, if you use one) indicates that a new NIC is detected once you load the module, you can install it persistently with:

$ sudo cp 8812au.ko /lib/modules/$(uname -r)/kernel/drivers/net/wireless
$ sudo depmod

You will need to recompile this driver each time you install a new kernel update.

  • Hi, Many thans for details. So now I can see thw wireless networks using iwconfig, but I am struggling to get it connected. I am following the link you suggested github.com/stevekay/centos7/blob/master/wifi.md but not connecting so far. Ill keep trying any advice in the meantime greatly appreciated – Shane Donnellan Mar 30 '19 at 19:19
  • I get the following sudo wpa_supplicant -B -i enp0s29f7u2 -c /etc/wpa_supplicant.conf -D wext Successfully initialized wpa_supplicant rfkill: Cannot get wiphy information ioctl[SIOCSIWAP]: Operation not permitted – Shane Donnellan Mar 30 '19 at 19:30
  • Apparently you might need a newer version of the wireless-tools package than is available in standard CentOS 7. You can get it with: sudo yum -y install epel-release; sudo yum -y install wireless-tools. – telcoM Mar 31 '19 at 6:21
  • Hi Ran both commands - no updates found "Package 1:wireless-tools-29-13.el7.x86_64 already installed and latest version Nothing to do" – Shane Donnellan Apr 1 '19 at 16:24

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