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UniFi - How to specify the IP Interface used by Controller and pending UAPs?

If a controller machine has multiple IP interfaces, then administrators can edit the file to manually set an exact IP interface that adopted UAPs will use to communicate with the controller.  

  • system_ip=a.b.c.d           # the IP devices should be talking to for inform

Perhaps the controller has separate wireless and wired interfaces active, not bridged, and wants to distinguish the wired interface as the default management IP for inform. In this case, set the system_ip= and adopted UAPs will report using this interface.