D-Link DSL-2640B - Manual (Page 26)

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LAN
You can configure the DSL Router IP address and Subnet Mask for the LAN interface.
An available option if you will be multicasting is IGMP snooping, for which you can
also select standard or blocking mode.
If you want the DHCP server to automatically assign IP addresses, enable DHCP
server and enter the range of IP addresses that DHCP server can assign. Disable
DHCP server if you would like to manually assign IP addresses.
The Save button only saves the LAN configuration data, but does not apply the
configurations. Select the Save/Reboot button to save the LAN configuration data
and reboot the router and apply the new configurations.