D-Link DIR-505 User Manual page 44

Section 3 - Router Mode
Primary/
Secondary
Enter the primary and secondary DNS server addresses (for
DNS Server: static L2TP only).
MTU: If you experience connection issues, you may need to
change the MTU setting for optimal performance with your
speciic ISP. 1492 is the default MTU.
MAC Address: If your ISP requires you to enter a MAC address, ill it in here.
You can click the Clone MAC button to enter your current
computer's MAC address.
D-Link DIR-505 User Manual 39