So the only thing I see in the logs that looks suspicious is: Jan 30 13:30:49 bridgevm systemd-udevd[376]: Config file /run/systemd/network/10-netplan-br0devs.link matches device based on renamed interface name 'ens8', ignoring
(my setup is explained in https://bugs.launchpad.net/ubuntu/+source/nplan/+bug/1746246) The MTU setting is in that file, so if it is ignored it would stand to reason that the MTU would fail to apply. It looks like this would apply to *all* renamed interfaces, which I think is lots these days. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1724895 Title: MTU not applied on private ethernet interfaces To manage notifications about this bug go to: https://bugs.launchpad.net/netplan/+bug/1724895/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs