The origin of the address. manual(2) indicates that the
address was manually configured. wellknown(3) indicates
an address constructed from a well-known value, e.g. an
IANA-assigned anycast address. dhcp(4) indicates an
address that was assigned to this system by a DHCP
server. linklayer(5) indicates an address created by
IPv6 stateless autoconfiguration. random(6) indicates
an address chosen by random, e.g. an IPv4 address within
169.254/16, or an RFC 3041 privacy address.