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I am trying to turn off my wifi interface using the following ifconfig command:
ifconfig wlan0 down
My wifi disconnected for almost one second and then it comes back up again.
what is the problem and how I fix it ?
rfkill
You most probably use network-manager, try nmcli nm wifi off.
nmcli nm wifi off
rfkill
instead? most likely networkmanager overrides your manual config.