Address status. The preferred(1) state indicates
that this is a valid address that can appear as
the destination or source address of a packet.
The deprecated(2) this is a valid but deprecated
address that should no longer be used as a source
address in new communications, but packets addressed
to such an address are processed as expected. The
invalid(3) state indicates that this is not valid
address which should not appear as the destination
or source address of a packet. The inaccessible(4)
state indicates the address is not accessible because
the interface to which this address is assigned is
not operational.