Manually stop Network Manager
If Network Manager is not needed during testing, it can be shut off completely.
systemctl stop NetworkManager
systemctl start NetworkManager
The above commands will stop/start NetworkManager, but will not affect whether it is automatically started when the machine boots. To disable/enable NetworkManager automatically when the system boots, again use the systemctl command (as root):
systemctl disable NetworkManager
systemctl enable NetworkManager
Network Manager stop
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