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In that case, VDSL driver "internally" does support larger MTUs and probably should be set to offer such 'automatically', whereas I can quite understand that in the case of PPPoE links, other modems' ethernet-links may-or-may-not support the larger MTU, and so may be best to set-up manually...
alecrobertson13:
TP-LINK Archer C7, OpenWrt 18.06.1 r7258-5eb055306f / LuCI openwrt-18.06 branch (git-18.228.31946-f64b152).
Use PPPoE for WAN. Set MTU to 1508.
Observe ifconfig result. MTU is set at 1492, it should be 1500.
Add
config interface 'eth0'
option ifname 'eth0'
option mtu '1508'
to /etc/config/network, ensure PPPoE MTU (as above) is set to 1508 and restart the network/reboot the router.
Observe ifconfig result. MTU is set at 1500 as expected.
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