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[Lars Kellogg-Stedman <lars@xxxxxxxxxx>]

Public bug reported:

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

** Affects: cloud-init
     Importance: Undecided
         Status: New

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

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

Status in cloud-init:
  New

Bug description:
  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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