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Upon receiving the NS packet, the target replies with a neighbor advertisement (NA) message, if appropriate.

The NS messages are multicast packets using the solicited-node multicast address of the target address for the destination address and an address of the requesting node or the unspecified address during the DAD process for the source address. An NS message is sent by a node to obtain or confirm the link layer address of a neighbor for which it knows the IP address. The NS message is used for address resolution, neighbor unreachability detection (NUD), and DAD. Format of the neighbor solicitation (NS) and neighbor advertisement (NA) messages.