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0e1f616
(Get the code!)
I have merged the netplan code to that effect in netplan master now - i.e. generate reloads udevadm rules.
However, I have now realised something.
MTUBytes can be set in two places: NetDev.MTUBytes key in the .link file and in Link.MTUBytes key in the .network file.
The .link setting is applied by udev, whereas the .network setting is applied by networkd on link up.
I guess it matters if the link is managed by networkd subsequently or not. I wonder if we want to set mtu in .link file, .network, or both. Such that mtu is correct if networkd doesn't manage the interface (.link file alone), and the mtu is corrected upon link up too (.network setting) if it is changed, given that .link files are not.