D-Link DFL-600 - Manual (Page 28)

As an example, if your LAN network is to be a 192.168.0.x network with a
subnet mask of 255.255.255.0, you might assign the DFL-600 an IP address
of 192.168.0.1 and configure the DFL-600’s DHCP server to assign
addresses in the range between 192.168.0.2 to 192.168.0.100. The default
gateway setting for computers on the LAN side will be the DFL-600’s IP
address
− in this case, 192.168.0.1.
Saving all of this information to the DFL-600’s flash RAM and restarting the
router will make this IP addressing scheme current. When you enable DHCP
(in Windows, “obtain an IP address automatically”) and restart the
computers connected to the LAN side of the DFL-600, they will
automatically be assigned IP addresses from the range 192.168.0.2 to
192.168.0.100.
As an alternative, you could disable the DHCP server on the DFL-600 and
manually update the IP address, subnet mask and default gateway
information for each computer on the LAN side of the DFL-600.
It is recommended that if you need to change the IP addressing scheme for
the DFL-600, that you configure the DFL-600’s DHCP server with the
appropriate IP address range and subnet mask first, and then assign an IP
address from the same range to the DFL-600. That way, a computer on the
LAN side of your network can always get the proper network addressing
information by DHCP from the DFL-600 simply by being restarted.