5.4.5 When Duplicate Address Detection Fails
A tentative address that is determined to be a duplicate as described above MUST NOT be assigned to an interface and the node SHOULD log a system management error. If the address is a link-local address formed from an interface identifier based on the hardware address (e.g., EUI-64), the interface SHOULD be disabled. In this case, the IP address duplication probably means duplicate hardware addresses are in use, and trying to recover from it by configuring another IP address will not result in a usable network. In fact, it probably makes things worse by creating problems that are harder to diagnose than just shutting down the interface; the user will see a partially working network where some things work, and other things will not. On the other hand, if the duplicated link-local address is not formed from an interface identifier based on the hardware address, the interface MAY continue to be used.
Ok.
--Jari
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