How can I monitor LAN (internet) usage by MAC / device through my router

andyww

I'd like to monitor which of our devices is using more or less of the monthly data allowance we have for broadband.  We have a ZyXEL VGM8924-B10A router

#CPE_December

SEJ

You can monitor each LAN port's sent and received data in the GUI.
Login the router -> System Monitor -> Traffic Status -> LAN(tag) 
Click "more..." for detail.
However, the number will not reset monthly by itself.
FYI