D-Link DVG-6004S User Manual page 21

DVG-6004S User's Manual
General Settings → WAN
Factory Default MAC Address: The original MAC address of the VoIP Gateway.
Your MAC Address: It is left blank as you log-in via the WAN port.
Current MAC Address: It shows the current MAC Address if you ever used the different MAC address
from Factory Default MAC Address. You can click Clone to automatically copy the MAC address of the
Ethernet Card installed in the computer used to configure the device.
Note: This is only necessary to fill the field if required by your ISP.
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VoIP Gateway Configuration