D-Link DSL-2520U User Manual page 26

Section 3 - Configuration
DHCP TABLE
The Host Name can help you recognize the PC with the MAC Address,
such as "Father's Laptop", it's recognized from dynamic assigned IP's
host name.
Select the IP Address to let you reserve the IP Address for the
designated PC with the configured MAC Address.
Drop down Manual Configure drop-down list to help you get the Mac
address from the PC you are using now browsing this web page.
Typing MAC address nearby Manual Configure to add/delete MAC
address + IP binding manually.
Drop down Status drop-down list to help you set static IP address + MAC
address binding or delete exist IP address + MAC address binding group.
Static means add IP address + MAC address binding to DHCP
reservation table, Auto means delete exist IP address + MAC address
binding from DHCP reservation table.
Click on the Save Settings button to save the settings.
D-Link DSL-2520U User Manual 26