I have two vlan interfaces configured upon a physical NIC. At boot, racing can happen when network-manager (nm) trying to bring up connections while udev is still renaming network devices. Due to the renaming not completed, nm may not be able to recognize the device that the two vlan interfaces depend on. So, it may fail to bring up the two interfaces, while udev is still setting the device up. When the uevent of the device arrives later, nm does not attempt to bring up the two vlan interfaces. For a similar problem, see the comments(7~10) on this page: https://bugs.freedesktop.org/show_bug.cgi?id=56929
(In reply to John Yu from comment #0) > I have two vlan interfaces configured upon a physical NIC. > > At boot, racing can happen when network-manager (nm) trying to bring up > connections while udev is still renaming network devices. > > Due to the renaming not completed, nm may not be able to recognize the > device that the two vlan interfaces depend on. So, it may fail to bring up > the two interfaces, while udev is still setting the device up. When the > uevent of the device arrives later, nm does not attempt to bring up the two > vlan interfaces. > > > For a similar problem, see the comments(7~10) on this page: > https://bugs.freedesktop.org/show_bug.cgi?id=56929 NetworkManager should start managing the interface only after udev has announced it. Can you please set level=TRACE in the [logging] section of /etc/NetworkManager/NetworkManager.conf, reboot and then attach the output of 'journalctl -u NetworkManager -b'? Thanks!
Created attachment 1246014 [details] network-manager log with trace
In the log file attached, the device name is ens3f1. Two vlan: ens3f1-vlan9 and ens3f1-vlan401,
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