D-Link DIR-866L User Manual page 35

Section 3 - 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 click on Clone Your PC's MAC Address to replace
the Internet port's MAC address with the MAC address of your Ethernet card.
D-Link DIR-866L User Manual 30