3. Enter the modem router user name and password.
The user name is admin.The default password is password.The user name and password are
case-sensitive.
The BASIC Home page displays.
4. Select ADVANCED > Setup > WAN Setup.
The WAN Setup page displays.
5. In the MTU Size field, enter a value from 616 to 1500.
The normal MTU (maximum transmit unit) value for most Ethernet networks is 1500 bytes or 1492 bytes
for PPPoE connections.
6. Click the Apply button.
Your settings are saved.
Manage the Internet Settings Manually
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AC1200 WiFi VDSL/ADSL Modem Router Model D6220