[Bug 1567744] Re: USB NICs get too long name for ifupdown aliases

[Dimiter Naydenov]

Additionally, Juju creates bridges on top of both physical and VLAN
interfaces to allow for the same level of addressability for containers
as regular machines. The bridges currently use the "br-" prefix and the
underlying device name, which if it happens to be
"enxxaabbccddeef0.1234" already, obviously won't work. So the length
limit on interface names can be even lower than what Mike suggested.

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https://bugs.launchpad.net/bugs/1567744

Title:
  USB NICs get too long name for ifupdown aliases

Status in systemd package in Ubuntu:
  Triaged

Bug description:
  I have a USB NIC that is connected to my denial system. I tried to
  create an alias, and after reboot, it wasn't created. When I manually
  try to bring it up I have the error.

  /e/n/i:

  auto enx000ec688b79f
  iface enx000ec688b79f inet static
          address 10.90.90.1
          netmask 255.255.255.0

  auto enx000ec688b79f:1
  iface enx000ec688b79f:1 inet static
          address 192.168.100.1
          netmask 255.255.255.0

  ubuntu at maas00:~$ sudo ifup enx000ec688b79f
  ubuntu at maas00:~$ sudo ifup enx000ec688b79f:1
  RTNETLINK answers: Numerical result out of range
  Failed to bring up enx000ec688b79f:1.

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