[Bug 1307429] Re: Existing allow-hotplug devices do not come up

[Stéphane Graber]

I'll take care of the utopic side of this when merging ifupdown,
hopefully in the next couple of days.

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https://bugs.launchpad.net/bugs/1307429

Title:
  Existing allow-hotplug devices do not come up

Status in “ifupdown” package in Ubuntu:
  Triaged
Status in “ifupdown” source package in Precise:
  New
Status in “ifupdown” source package in Saucy:
  New
Status in “ifupdown” source package in Trusty:
  Triaged

Bug description:
  Devices that are listed with allow-hotplug in /etc/network/interfaces
  do not come up when they are hotplugged. "ip addr" shows that these
  devices are down.

  Steps to reproduce:

  1) Install Ubuntu 12.04, 13.10, or 14.04 in a virtual machine (e.g. with libvirt) with one network device.
  2) Modify /etc/network/interfaces to

  auto lo
  iface lo inet loopback
  allow-hotplug eth0
  iface eth0 inet dhcp
  allow-hotplug eth1
  iface eth1 inet dhcp
  allow-hotplug eth2
  iface eth2 inet dhcp

  3) Boot your virtual machine.
  4) Type "ip addr" to show your network devices. It should show eth0 which should be up (but isn't)
  5) Add/Hotplug one NIC to your virtual machine.
  6) "ip addr" should show that eth1 is up too (but isn't)

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