Legacy Products
The resources associated with these products have ceased their development and are no longer supported.
D-Link Systems, Inc. recommends retiring these products and replacing them with products that receive firmware updates.
How do I change the MTU on my DFL Series Firewall?

Step 1: Open the web browser and type the IP address of the firewall into the address bar (default is Press Enter.

Step 2: Click on the plus sign next to interfaces and select Ethernet.

Step 3: Click on the WAN interface.

Step 4: Click on the Advanced Tab and Change the MTU to desired amount.

Step 5: Click on the Configuration tab and select Save and Activate from the dropdown menu. Click on OK to save and activate your changes.