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[Launchpad Bug Tracker <1701097@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package cloud-init -
0.7.9-221-g7e41b2a7-0ubuntu1

---------------
cloud-init (0.7.9-221-g7e41b2a7-0ubuntu1) artful; urgency=medium

  * New upstream snapshot.
    - sysconfig: use MACADDR on bonds/bridges to configure mac_address
      [Ryan Harper] (LP: #1701417)
    - net: eni route rendering missed ipv6 default route config
      [Ryan Harper] (LP: #1701097)
    - sysconfig: enable mtu set per subnet, including ipv6 mtu
      [Ryan Harper] (LP: #1702513)
    - sysconfig: handle manual type subnets [Ryan Harper] (LP: #1687725)
    - sysconfig: fix ipv6 gateway routes [Ryan Harper] (LP: #1694801)
    - sysconfig: fix rendering of bond, bridge and vlan types.
      [Ryan Harper] (LP: #1695092)
    - Templatize systemd unit files for cross distro deltas. [Ryan Harper]
    - sysconfig: ipv6 and default gateway fixes. [Ryan Harper] (LP: #1704872)
    - net: fix renaming of nics to support mac addresses written in upper case.
      (LP: #1705147)

 -- Scott Moser <smoser@xxxxxxxxxx>  Thu, 20 Jul 2017 21:37:12 -0400

** Changed in: cloud-init (Ubuntu Artful)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1701097

Title:
  eni rendering of ipv6 gateways fails

Status in cloud-init:
  Confirmed
Status in cloud-init package in Ubuntu:
  Fix Released
Status in cloud-init source package in Xenial:
  Confirmed
Status in cloud-init source package in Yakkety:
  Confirmed
Status in cloud-init source package in Zesty:
  Confirmed
Status in cloud-init source package in Artful:
  Fix Released

Bug description:
  cloud-init trunk and xenial, yakkety, zesty and artful all fail

  A network config with a ipv6 gateway route like:

  
  subnets:
    - type: static
      address: 2001:4800:78ff:1b:be76:4eff:fe06:96b3
      netmask: 'ffff:ffff:ffff:ffff::'
      routes:
        - gateway: 2001:4800:78ff:1b::1
          netmask: '::'
          network: '::'

  For eni rendering, this should create a post-up/post-down route
  command that generates a default ipv6 route entry, like this:

      post-up route add -A inet6 default gw 2001:4800:78ff:1b::1 || true
      pre-down route del -A inet6 default gw 2001:4800:78ff:1b::1 || true

  However, what is currently generated is this:

      post-up route add -net :: netmask :: gw 2001:4800:78ff:1b::1 || true
      pre-down route del -net :: netmask :: gw 2001:4800:78ff:1b::1 || true

  That does not install the route correctly as a default gateway route.

  This is fallout from commit d00da2d5b0d45db5670622a66d833d2abb907388 
  net: normalize data in network_state object

  This commit removed ipv6 route 'netmask' values, and converted them to
  prefix length values, but failed to update the eni renderer's check for
  ipv6 default gateway.

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