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odhcp6c already supports custom DUIDS on a per-interface basis. When no client identifier has been set, odhcp6c will generate one on the basis of the MAC address of the given interface. This is contrary to how DUIDs are meant to be used, as the client identifier will vary from interface to interface, while it is meant to remain stable for a given host, no matter how the network hardware changes (see RFC8415, §11). Fix this by letting odhcp6c use the global DHCP DUID, if configured. Signed-off-by: David Härdeman <david@hardeman.nu> Link: https://github.com/openwrt/openwrt/pull/20359 Signed-off-by: Robert Marko <robimarko@gmail.com>