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Wrong MTU for pppoe

Hi,

I don't know whether this is a bug or not, I'm not a network specialist, but since some update, Network Manager sets incorrect MTU value for my DSL connection. MTU change in the Network Manager from auto to 1492 under Ethernet tab for both enp4s0 and the connection doesn't help. Adding MTU=1492 to etc/sysconfig/network-scripts/ifcfg-enp4so doesn't help either. The solution for me is to run "ip link set mtu 1492 dev enp4s0" in the terminal on every boot. So the question is: Is there another solution that would set MTU permanenetly?

Thanks.