1) Tentative: It is the state where the address is not verified as unique. A node with address in tentative state can only receive multicast neighbor advertisement.
2) Valid: In this state a node can send and receive unicast traffic. Valid states include both deprecated and preferred states.
Preferred: A node with address in preferred state can send and receive unicast traffic from and to a node with preferred address. In auto configuration the preferred lifetime is determined from the router advertisement.
Deprecated: When the preferred lifetime expires, state of the address moves to deprecated. At this point node should not accept new connections. It can still use the existing connection before the state moves to invalid.
3) Invalid: Address can no longer be used for reception or transmission of packets.
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