D-Link SharePort Go DIR-506L User Manual page 34

Section 3 - Configuration
MTU:
If you experience connection issues, you may need to
change the MTU setting for optimal performance with
your specific ISP. 1492 is the default MTU.
MAC Address:
If your ISP requires you to enter a MAC address, fill it in
here. You can click the Clone MAC button to enter your
current computer's MAC address.
D-Link DIR-506L User Manual 30