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Bridge Mode vs Relay vs Acess Point (AP) / Routers vs Dedicated Access Points (AP)Also the behavior of the router working in AP mode using the features will change and most of the features of this router should not be used while in AP mode as they are designed to working in router mode, not AP mode which is not supported or designed. It's recommended that you use your main host router to handle any of the management features instead if your going to use the 645 in AP mode.
MAC Filtering controls both Wired and wireless. I would presume that if your ALLOWing MACs thru then any of them should have access. IF you are DENYing MACs then nobody gets access at all. I would presume that the 645 would operate normally in Router mode. Have you tried it yet?