GIGABYTE AirCruiser GN-BR30N-RH - Manual (Page 51)

GN-BR30N-RH 2.4GHz AirCruiser N300 Wireless Router
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The Change WAN MAC Screen
The Change WAN MAC screen allows you to assign a new MAC address. If
your ISP requires MAC address authentication, chose the Assign WAN MAC
option and enter the ISP authorized MAC address in the New WAN MAC
Address field and click the Submit button. If you want to restore the factory
default MAC address, choose the Restore Default WAN MAC option and click
the Submit button.