D-Link GO-RT-N150 User Manual page 22

Section 3 - Configuration
MTU: Transmission Unit for optimal performance with
MAC Address:
your specific ISP (default MTU is 1492).
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 GO-RT-N150 User Manual 18