How does an IPv6 client ensure that it has a unique address after it configures its IPv6 address using the SLAAC allocation method?
It contacts the DHCPv6 server via a special formed ICMPv6 message.
It checks with the IPv6 address database that is hosted by the SLAAC server.
It sends an ICMPv6 Neighbor Solicitation message with the IPv6 address as the target IPv6 address.
It sends an ARP message with the IPv6 address as the destination IPv6 address.