IPv6 has flags on IP addresses

|Name|Meaning |permanent| This address was configured manually (default) |dynamic|Thie address was learnt through RouterAdvertisement? |secondary| This address is not used when selecting a source address of a new IPv6 packet. |primary| This address is used when selecting a source address of a new IPv6 packet. |tentative|This address was added to an interface, but it's not yet clear if it's unique on this network segment, so the address is not used (yet). |deprecated|This address has expired and will not be used for further outgoing connections (but will still be around in case of connections that are still using this address)