D-Link DIR-615S Quick Installation Manual page 26

DIR-615S Quick Installation Guide
If you want to manually assign the LAN IPv4 address for DIR-615S, do not
select the Automatic obtainment of IPv4 address checkbox and fill in
the IP address, Subnet mask, DNS IP address, Hostname fields and,
if needed, the Gateway IP address field. Make sure that the assigned
address does not coincide with the LAN IPv4 address of the router to which
your device connects.
3. Click the NEXT button.
26