Cannot set PPoE MTU size

From:	Giselher Nitz <nitz at framingo dot de>
To:	m0n0wall at lists dot m0n0 dot ch
Subject:	Cannot set PPoE MTU size
Date:	Sun, 25 Dec 2005 08:56:44 -0100

Hi,

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?

Kind regards
   Giselher