IPv4 configuration should be automatically determined via a method appropriate for the hardware interface, ie DHCP or PPP or some other device-specific manner
DISABLED
DISABLED = 'disabled' :
This connection does not use or require IPv4 address and it should be disabled
LINK_LOCAL
LINK_LOCAL = 'link-local' :
IPv4 configuration should be automatically configured for link-local-only operation
MANUAL
MANUAL = 'manual' :
All necessary IPv4 configuration is specified in the setting
SHARED
SHARED = 'shared' :
This connection specifies configuration that allows other computers to connect through it to the default network