HP 6200YL - Manual (Page 90)

IPv6 Addressing Configuration
Duplicate Address Detection (DAD)
■ If a previously configured unicast address is changed, a neighbor adver­
tisement is sent on the VLAN to notify other devices, and also for duplicate
address detection.
■ If DAD is disabled when an address is configured, the address is assumed
to be unique and is assigned to the interface.
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