D-Link DFL-1100 User Manual page 133

Disable NAT on the DMZ Interface:
By default the DFL-1100 is enabled to perform NAT on both LAN and DMZ interfaces.
Disable NAT on the DMZ interface.
Navigate to Firewall > Policy in the web-based configuration. Click on DMZ->WAN to
modify the behavior of the DMZ interface.
Select the No NAT – requires public IP addresses on DMZ network radio button.
After making configuration changes click on the Apply button to save those changes.
To allow services on the DMZ interface to be accessible from the WAN, incoming policies
must be defined to allow those services. This can be done through the WAN->DMZ section in
the Firewall Policy configuration section.
Once all changes are final, those changes must be activated. Click on the Activate
button under the left-hand-side menu.
configuration.
Follow the on-screen instructions to finalize your