Furuno NAVNET 3D MFD8/12/BB - Manual (Page 76)

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You will need to restart (power OFF and ON) the camera after the address is changed.
(Just unplug and plug back the Ethernet cable if you are using the POE).
It can take a while before the confirmation box appears.
Click the “Close” button.
The first IP camera has been correctly assigned
Repeat the process with the other cameras