IPv6 configuration should be automatically determined via a method appropriate for the hardware interface, ie router advertisements, DHCP, or PPP or some other device-specific manner
DISABLED
DISABLED = 'disabled' :
IPv6 is disabled for the configuration
DHCP
DHCP = 'dhcp' :
IPv6 configuration should be automatically determined via DHCPv6 only and router advertisements should be ignored
IGNORE
IGNORE = 'ignore' :
IPv6 is not required or is handled by some other mechanism, and NetworkManager should not configure IPv6 for this connection
LINK_LOCAL
LINK_LOCAL = 'link-local' :
IPv6 configuration should be automatically configured for link-local-only operation
MANUAL
MANUAL = 'manual' :
All necessary IPv6 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