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*It is important to have the latest firmware. You can download D-Link firmware here.
Open a browser session and enter "192.168.0.1" in the address field to access the router interface.
Enter "admin" (without quotes) in the Username Field. leave the Password blank unless you have previously set a password.
Click on the WAN button from the vertical menu on the left. Enter the MTU that you obtained from the MTU Ping Test. Click Apply. The modem will restart.