[FS#94] netifd: PPPoE MTU problem

[LEDE Bugs]

The following task has a new comment added:

FS#94 - netifd: PPPoE MTU problem
User who did this - Hamy (Hamy)

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OpenWrt had this problem for as long as i remember. as a workaround, you can use pppd_options like this:

config interface 'wan'
        option ifname 'ptm0.7'
        option proto 'pppoe'
        ...
        option pppd_options 'mtu 1448'

do NOT change the mtu of the underlying interface and let it be the default of 1500
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=94#comment1048