*** This bug is a duplicate of bug 1224007 ***

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: ifupdown (Ubuntu)
       Status: New => Confirmed

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  MTU settings not always applied after reboot

Status in ifupdown package in Ubuntu:

Bug description:
  On a node with two 10G interfaces, we configure a bond interface from
  these two interfaces and then a vlan interface on top of it. The MTU
  of these interfaces shall be set to be 1550 instead of the default
  1500, so we have these settings in /etc/network/interfaces.d:

  root@controller-node13:~# cat /etc/network/interfaces.d/xge0
  auto xge0
  iface xge0 inet manual
    bond-master xiondata

  root@controller-node13:~# cat /etc/network/interfaces.d/xge1
  auto xge1
  iface xge1 inet manual
    bond-master xiondata

  root@controller-node13:~# cat /etc/network/interfaces.d/xiondata
  auto xiondata
  iface xiondata inet manual
    bond-slaves xge0 xge1
    bond-miimon 100
    bond-lacp-rate 1
    bond-mode 4
    mtu 1550

  root@controller-node13:~# cat /etc/network/interfaces.d/xiondata.200
  auto xiondata.200
  iface xiondata.200 inet static
    vlan_raw_device xiondata
    mtu 1550

  After a reboot, the correct MTU is applied to the vlan interface only
  50% of the time, on the other attempts, it stays at 1500, leading to
  broken connectivity. If I restart the interfaces manually, by doing
  "ifdown xiondata; ifup -a" the MTU settings seem to be applied
  correctly every time.

  root@controller-node13:~# apt policy ifupdown
    Installed: 0.8.10ubuntu1
    Candidate: 0.8.10ubuntu1
    Version table:
   *** 0.8.10ubuntu1 500
          500 http://eu.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ifupdown 0.8.10ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
  Uname: Linux 4.4.0-38-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  Date: Tue Oct  4 09:44:40 2016
   PATH=(custom, no user)
  SourcePackage: ifupdown
  UpgradeStatus: No upgrade log present (probably fresh install)

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