[FS#94] netifd: PPPoE MTU problem

[LEDE Bugs]

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FS#94 - netifd: PPPoE MTU problem
User who did this: john (john)
Assigned To: [-] -> Felix Fietkau

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=94