D-Link DFL-600 - Manual (Page 36)

to connections to the WAN or Internet. The IP address must be from the
same range as the IP address of the DMZ port. The default DMZ IP address
is 192.168.1.1, so DMZ Servers must be from the IP address range from
192.168.1.2 to 192.168.1.254, with a subnet mask of 255.255.255.0.
DMZ host IP address This is the IP address you have assigned to your
DMZ computer. You will need to manually configure
the IP address settings for each computer you
connect to the DFL-600's DMZ port. It must be from
the same IP address range as you assigned to the
DMZ port. The DFL-600's default IP address range
for the DMZ port is 192.168.1.2 to 192.168.1.254.