What's new in 6.20 (2014-Oct-01 10:06):
...
*) pppoe-server has auto mtu feature (enabled by default for new pppoe servers);

WHERE?! Could anyone answer - WHERE I can enable/disable or set THIS feature?

No one know? No one answer.
So - is that only "changelog feature", not RouterOs feature? ;P

ros code

/interface pppoe-server server> set max-mtu=auto

HTH,

Grzegorz, set it and check it at WinBox.
MTU has value "0" and is marked red colour as error!

MTU has value "0" and is marked red colour as error!

Yes, you are right, but it's probably Winbox error only.

ros code

/interface pppoe-server print detail

shows proper MTU value.

Regards,

What will be difrence betwen 1480 and auto ? what will hapen when i set them auto ?

What will be difrence betwen 1480 and auto ? what will hapen when i set them auto ?

any help ?