[Bug 1573272] [NEW] default gateway route not installed for bond interfaces through reboot

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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 ..

** Affects: ifupdown (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment xenial
-- 
default gateway route not installed for bond interfaces through reboot
https://bugs.launchpad.net/bugs/1573272
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