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@nicefile Changing the MTU value is supported since 5.11. Try to backport [[https://github.com/torvalds/linux/commit/9470174e7581e75a8ebd78964997314dfc2e706c#diff-35d2b0dd263dfe166663a9af8babdaebc5c43f0698cf6c73eb531079e0fbf4da|this commit]].
nicefile:
Dir878 /882 /882-r1 (mt7530)
OpenWrt SNAPSHOT, r18502-53b87a7a28 but seems linux 5.10 builds are afected as 5.4 kernel it's fine.
There is issue with setting MTU to 1508 for DSA driver to be rfc4638 compatibile
root@OpenWrt:
# ifconfig br-lan mtu 1508# ifconfig eth0 mtu 1508root@OpenWrt:
root@OpenWrt:~# ifconfig LAN2 mtu 1508
ifconfig: SIOCSIFMTU: Invalid argument
But even then MTU > 1500 seem to work for lan side.
root@OpenWrt:~# fping -s -M -b 1473 192.168.1.3
192.168.1.3 is alive
But to be able to use rfc4638 pppoe WAN must be set to 1508
root@OpenWrt:~# ifconfig wan mtu 1508
ifconfig: SIOCSIFMTU: Invalid argument
PPPoE session is always connecting with MTU 1492
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