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The MAC Address menu has settings to let you electronically change the MAC (Media Access Control) address of various network interfaces.
Note that this function does not change the hardware MAC Address in the actual device chip. It just overlays the different address in software.
WAN Port: In this field, you can enter any valid MAC Address to be assigned to the WAN interface.
Wireless Interface eth1: In this field, you can enter any valid Mac Address to be assigned to wireless interface eth1
Wireless Interface eth2: In this field, you can enter any valid Mac Address to be assigned to wireless interface eth1
Wireless Interface wl0.1: In this field, you can enter any valid Mac Address to be assigned to wireless interface wl0.1