D-Link DGL-4500 - GamerLounge Xtreme N Gaming Router Wireless User Manual page 29

Section  - Configuration
MTU: Maximum Transmission Unit - you may need to change the MTU for optimal performance with your specific ISP. 1400 is
the default MTU.
MAC Address:
The default MAC Address is set to the Internet port's physical interface MAC address on the Broadband Router. It is not
recommended that you change the default MAC address unless required by your ISP. You can use the Clone.Your.PC's.
MAC.Address button to replace the Internet port's MAC address with the MAC address of your Ethernet card.
D-Link DGL-4500 User Manual 4