Setting MTU of interface without reboot

[Chris.Rebischke@xxxxxxxxxxxxx (Christian Rebischke)]

Hello,
I am unsure if this is a bug or intended behaviour. I have a network
file like this one:

/etc/systemd/network/en0s25.network

```
[Match]
Name=enp0s25

[Link]
MTUBytes=9000

[Network]
Address=192.168.1.101/24
Gateway=192.168.1.1/24
DNS=192.168.1.1

```

When I reboot the computer the MTU will get set, but when I
restart systemd-networkd the MTU will not get set. Is this intended
behaviour or a bug? (Setting the MTU via `ip link set enp0s25 MTU 9000`
works fine)


best regards

chris
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