I cannot set MTU size for the WAN interface PPoE connection.
In fact I want 1492 Bytes but the system always has 1500.
Everything I change in the web interface gets saved and used, apart from
MTU size in PPoE. It gets saved obviously, because after reboot the
correct value is shown in the web interface configuration page, but
status.php always shows 1500 for the wan interface.
How can I force it or can anyone help?