OpenWRT PPPoE
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The first most important item to remember when a router relies on internet access via DSL with PPPoE, is that IP Frames are limited to 1492 Bytes (not the standard 1500)
OpenWRT claims that the "MSS (Maximum Segment Size) Clamping" Feature (option mtu_fix '1' in the /etc/config/firewall file) takes care of this (the setting even gets added automatically when configuring a PPPoE WAN Interface), but in reality it is safer to manually configure it: option mtu 'WhatEverValue' (1492 in the case of PPPoE) in the /etc/config/network file.
https://en.wikipedia.org/wiki/Point-to-Point_Protocol_over_Ethernet