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This will only work with firmware version 1.91A or later .
Go to the main setup page and login with password; default password is "admin" (no quotes).
192.168.123.254:88 (if remote admin is enabled)
Go to the system parameter page.
192.168.123.254:88/sysp.htm (if remote admin is enabled).
In the MTU for PPPoE box, change 1440 to 1492. You must save and reboot the router for the change to take effect.
The NIC must be set at 1500 with DRTCP19.
On firmware version 1.92D, you can also change the MTU setting for Static/Dynamic IP Address.