[Bug 1254120] Re: Bonded interfaces don't come down with a ifdown -a

[Mike Reid]

Thank you, Chris.

Your comment from 2014-03-20 regarding "multiple gateways" finally
helped me to resolve our dreaded startup delays on trusty (14.04.3 LTS)
that appeared the moment we activated our bonded interface. Took lots of
digging, appreciate you documenting the required fix.

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https://bugs.launchpad.net/bugs/1254120

Title:
  Bonded interfaces don't come down with a ifdown -a

Status in ifenslave package in Ubuntu:
  Invalid

Bug description:
  1) Precise -> Trusty
  2) 1.1.0_19ubuntu5
  3) a. Set up new interfaces config with a simple bonded config (you don't need eth0):
  auto eth0
  iface eth0 inet dhcp

  auto eth1
  iface eth1 inet manual
   bond-master bond0
   bond-primary eth1

  auto eth2
  iface eth2 inet manual
    bond-master bond0

  auto bond0
  iface bond0 inet static
   address 192.168.122.99
   gateway 192.168.122.1
   netmask 255.255.255.0
   bond-mode active-backup
   bond-miimon 100
   bond-slaves none

  b.  Restart the machine to bring up in a known state (wait an extra few minutes to make sure the interfaces aren't still waiting)
  c.  Note what interfaces come up correctly via ifconfig
  d.  Run ifdown -a.  This should bring down all interfaces....

  4) Ifdown -a doesn't bring down bond0

  Observations:
    - if we're using dhcp for the bond0 interface this works
    - if there isn't an extra eth0 device (as described above) this works

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