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[Launchpad Bug Tracker <1573272@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package vlan - 1.9-3.2ubuntu3

---------------
vlan (1.9-3.2ubuntu3) artful; urgency=medium

  * In vlan ifupdown pre-up script, instead of calling ip link up for
    raw device before creating vlan interface, do a full ifup for raw
    device.  Otherwise, if raw device processes ifup after vlan device,
    the raw device may be taken down and back up, which removes all vlan
    routes and other configuration. (LP: #1573272)

 -- Dan Streetman <dan.streetman@xxxxxxxxxxxxx>  Thu, 30 Mar 2017
09:16:10 -0400

** Changed in: vlan (Ubuntu Artful)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1573272

Title:
  default gateway route not installed for bond interfaces through reboot

Status in vlan package in Ubuntu:
  Fix Released
Status in vlan source package in Trusty:
  New
Status in vlan source package in Xenial:
  New
Status in vlan source package in Yakkety:
  New
Status in vlan source package in Zesty:
  New
Status in vlan source package in Artful:
  Fix Released
Status in vlan package in Debian:
  New

Bug description:
  [Impact]

  Systems using vlans, especially those using vlans on top of bond
  interfaces, in addition to default or other routes on the vlans, may
  find their vlan routes are not present at boot.

  The attached debdiff patches fix the vlan package's /etc/network/if-
  pre-up.d/vlan script.  Currently, the script will bring up a vlan's
  raw device if needed; but the problem is if the vlan's ifup processing
  happens before the raw device's ifup processing, the raw device may be
  taken down and back up (especially for bonds), and when the raw device
  is taken down, the vlan is as well, and thus loses all its routing
  configuration.  Instead of only bringing the raw device up using ip
  link up, the patch changes the vlan script to do a full ifup on the
  raw device, so it will remain up after the vlan is configured.

  [Test Case]

  Set up a system using two interfaces configured into a bond interface,
  with a vlan on top of that bond.  Add a default route and/or specific
  routes to the vlan interface.  Then edit the system as described in
  comment 8, and reboot.  The vlan's routes will not be present in the
  system.

  [Regression Potential]

  Any modifications to ifupdown or the scripts it uses may cause wider
  problems with network configuration.  Specifically, this could cause
  problems when using vlan interfaces, as it forces every vlan's raw
  device interface to be fully ifup'ed before the vlan interface can
  finish its ifup.

  [Other Info]

  original description below:

  
  Expectation:  After reboot, route for default gateway specified on bonded interface is installed according to "gateway x.x.x.x"  (where x.x.x.x is a valid IPv4 address) specified in /etc/network/interfaces or files sourced per /etc/network/interfaces

  Actual Result: After reboot, route is not installed. Interface does
  work otherwise (I can ping the gateway on that subnet, for instance).
  'ifdown -a' followed by  'ifup -a' (run with proper permission... so
  sudo) brings the gateway back until next reboot.

  Package:  I'm not familiar enough to be certain what is causing this,
  but I was seeing this in beta2 of 16.04 as well.

  *username snipped*@*hostname snipped*:~$ lsb_release -rd
  Description:    Ubuntu 16.04 LTS
  Release:        16.04
  *username snipped*@*hostname snipped*:~$ apt-cache policy ifenslave
  ifenslave:
    Installed: 2.7ubuntu1
    Candidate: 2.7ubuntu1
    Version table:
   *** 2.7ubuntu1 100
          100 /var/lib/dpkg/status

  *username snipped*@*hostname snipped*:~$ apt-cache policy ifupdown
  ifupdown:
    Installed: 0.8.10ubuntu1
    Candidate: 0.8.10ubuntu1
    Version table:
   *** 0.8.10ubuntu1 100
          100 /var/lib/dpkg/status

        /etc/network/interfaces

  ----------------------------------
  # This file describes the network interfaces available on your system
  # and how to activate them. For more information, see interfaces(5).

  source /etc/network/interfaces.d/*

  # The loopback network interface
  auto lo
  iface lo inet loopback

  # The primary network interface
  auto enp2s0f1
  iface enp2s0f1 inet manual
  bond-master bond0

  auto enp2s0f0
  iface enp2s0f0 inet manual
  bond-master bond0

  auto bond0
  iface bond0 inet static
          address 10.96.96.2
          netmask 255.255.255.0
          network 10.96.96.0
          broadcast 10.96.96.255
          # dns-* options are implemented by the resolvconf package, if installed
          dns-search *snip*
          bond-mode balance-alb
          bond-slaves none
          bond-miimon 100
  auto bond0.3000
  iface bond0.3000 inet static
          address 172.21.33.29
          netmask 255.255.255.0
          network 172.21.33.0
          broadcast 172.21.33.255
          gateway 172.21.33.1
          dns-search *snip*
          vlan-raw-device bond0
          dns-nameservers 172.31.10.84 8.8.8.8 4.2.2.2

  -----------------------------------------------------
  interfaces.d is empty:

  *username snipped*@*hostname snipped*:~$ ls -lisah /etc/network/interfaces.d
  total 8.0K
  10748247 4.0K drwxr-xr-x 2 root root 4.0K Jan 24 14:08 .
  10748237 4.0K drwxr-xr-x 7 root root 4.0K Apr 21 17:32 ..

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