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[Launchpad Bug Tracker <1669504@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package cloud-init - 0.7.9-90-g61eb03fe-
0ubuntu1~16.04.1

---------------
cloud-init (0.7.9-90-g61eb03fe-0ubuntu1~16.04.1) xenial-proposed; urgency=medium

  * debian/cloud-init.templates: add Bigstep to list of sources. (LP: #1676460)
  * New upstream snapshot.
    - OpenStack: add 'dvs' to the list of physical link types. (LP: #1674946)
    - Fix bug that resulted in an attempt to rename bonds or vlans.
      (LP: #1669860)
    - tests: update OpenNebula and Digital Ocean to not rely on host
      interfaces.
    - net: in netplan renderer delete known image-builtin content.
      (LP: #1675576)
    - doc: correct grammar in capabilities.rst [David Tagatac]
    - ds-identify: fix detecting of maas datasource. (LP: #1677710)
    - netplan: remove debugging prints, add debug logging [Ryan Harper]
    - ds-identify: do not write None twice to datasource_list.
    - support resizing partition and rootfs on system booted without
      initramfs.  [Steve Langasek] (LP: #1677376)
    - apt_configure: run only when needed. (LP: #1675185)
    - OpenStack: identify OpenStack by product 'OpenStack Compute'.
      (LP: #1675349)
    - GCE: Search GCE in ds-identify, consider serial number in check.
      (LP: #1674861)
    - Add support for setting hashed passwords [Tore S. Lonoy] (LP: #1570325)
    - Fix filesystem creation when using "partition: auto"
      [Jonathan Ballet] (LP: #1634678)
    - ConfigDrive: support reading config drive data from /config-drive.
      (LP: #1673411)
    - ds-identify: fix detection of Bigstep datasource. (LP: #1674766)
    - test: add running of pylint [Joshua Powers]
    - ds-identify: fix bug where filename expansion was left on.
    - advertise network config v2 support (NETWORK_CONFIG_V2) in features.
    - Bigstep: fix bug when executing in python3. [root]
    - Fix unit test when running in a system deployed with cloud-init.
    - Bounce network interface for Azure when using the built-in path.
      [Brent Baude] (LP: #1674685)
    - cloudinit.net: add network config v2 parsing and rendering [Ryan Harper]
    - net: Fix incorrect call to isfile [Joshua Powers] (LP: #1674317)
    - net: add renderers for automatically selecting the renderer.
    - doc: fix config drive doc with regard to unpartitioned disks.
      (LP: #1673818)
    - test: Adding integratiron test for password as list [Joshua Powers]
    - render_network_state: switch arguments around, do not require target
    - support 'loopback' as a device type.
    - Integration Testing: improve testcase subclassing [Wesley Wiedenmeier]
    - gitignore: adding doc/rtd_html [Joshua Powers]
    - doc: add instructions for running integration tests via tox.
      [Joshua Powers]
    - test: avoid differences in 'date' output due to daylight savings.
    - Fix chef config module in omnibus install. [Jeremy Melvin] (LP: #1583837)
    - Add feature flags to cloudinit.version. [Wesley Wiedenmeier]
    - tox: add a citest environment
    - Support chpasswd/list being a list in addition to a string.
      [Sergio Lystopad] (LP: #1665694)
    - doc: Fix configuration example for cc_set_passwords module.
      [Sergio Lystopad] (LP: #1665773)
    - net: support both ipv4 and ipv6 gateways in sysconfig.
      [Lars Kellogg-Stedman] (LP: #1669504)
    - net: do not raise exception for > 3 nameservers
      [Lars Kellogg-Stedman] (LP: #1670052)

 -- Scott Moser <smoser@xxxxxxxxxx>  Mon, 03 Apr 2017 11:52:56 -0400

** Changed in: cloud-init (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1669504

Title:
  net/sysconfig.py is broken with ipv4 + ipv6 interfaces

Status in cloud-init:
  Fix Committed
Status in cloud-init package in Ubuntu:
  Fix Released
Status in cloud-init source package in Xenial:
  Fix Released
Status in cloud-init source package in Yakkety:
  Fix Released

Bug description:
  === Begin SRU Template ===
  [Impact] 
  This code path is not applicable to Ubuntu.
  The bug was in supporting dual stack network configuration in
  sysconfig (Redhat/centos) format.
     
  [Test Case]
  Launch an instance on lxd, make sure it has network.
   
  [Regression Potential] 
  Changes to network rendering could have negatively affected Ubuntu
  the test above is valid to check that that didn't go horribly wrong.
     
  [Other Info]
  Upstream commit:
   https://git.launchpad.net/cloud-init/commit/?id=1d751a6f46
     
  === End SRU Template ===

  
  Given a network configuration that includes ipv4 and ipv6 configuration for an interface, as in:

     "networks": [
        {
           "id": "public-ipv6",
           "ip_address": "2604:A880:0400:00D0:0000:0000:1714:F001/64",
           "link": "interface-public",
           "netmask": "",
           "neutron_network_id": "937c94de-7029-586e-6e36-ea9af2d815de",
           "type": "ipv6",
           "routes": [
              {
                 "gateway": "2604:A880:0400:00D0:0000:0000:0000:0001",
                 "netmask": "::",
                 "network": "::"
              }
           ]
        },
        {
           "id": "public-ipv4",
           "ip_address": "198.199.75.198",
           "link": "interface-public",
           "netmask": "255.255.255.0",
           "neutron_network_id": "7d9cd798-2dc0-502f-41ca-e04b552ddffd",
           "type": "ipv4",
           "routes": [
              {
                 "gateway": "198.199.75.1",
                 "netmask": "0.0.0.0",
                 "network": "0.0.0.0"
              }
           ]
        }
      ]

  cloud-init will fail because both subnets provide a default route,
  resulting in the error:

      Duplicate declaration of default route found for interface eth0

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