How to set interface mode as dhcp globally

Users
1

what is the exact command for this default_boot_interface_link_type=DHCP ?

2

see MAAS's default setting: Machine's default Network should be IP mode DHCP - #4 by r00ta

3

Unable to set dhcp globally, could you please share any ready reference?

4

Setting DHCP globally won’t be available until 3.6 is released