I decided my home Linux server had been through too many LTS upgrades, and
did a fresh install of Ubuntu Server 18.04.
The old /etc/network/interfaces.d system has been replaced by netplan and
I was able to configure a bridge device and attach ethernet devices, but
setting the MTU doesn't work. (I have the MTU configured in netplan for
both the ethernet device and the bridge device)
I managed to hack in a workaround by making a networkd-dispatcher script
(routable.d) that calls `ip link set mtu ...`, but wondered if there's a
proper way to make this work on netplan?
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