spoof MAC address with NetworkManager

we will be using the nmcli utility to set the spoofed MAC address, which is the same configuration that the Ubuntu settings UI uses.

first, list the available connections:

nmcli connection show

choose the connection you want to manage and enter the interactive editing prompt with:

sudo nmcli connection edit ${connection:?}

nmcli interactive prompt

To set the the spoofed MAC address, enter:

set 802-3-ethernet.cloned-mac-address ${spoofed_mac:?}

If you no longer wish to be spoofing a MAC address, enter:

remove 802-3-ethernet.cloned-mac-address

Once you are finished, save the settings and exit:

save
quit