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[Chad Smith <1806014@xxxxxxxxxxxxxxxxxx>]

This bug is believed to be fixed in cloud-init in version 19.4. If this
is still a problem for you, please make a comment and set the state back
to New

Thank you.

** Changed in: cloud-init
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1806014

Title:
  [Centos] IPV6_AUTOCONF=no when using dhcp6

Status in cloud-init:
  Fix Released

Bug description:
  When instructing cloud-init to use `type: dhcp6` for the subnet of a
  physical network interface, the end-result is that
  `/etc/sysconfig/network` contains `IPV6_AUTOCONF=no`. This causes
  router advertisements to be ignored and no default route set up.

  https://github.com/cloud-init/cloud-init/blob/master/cloudinit/net/network_state.py#L333
  This configures `network.use_ipv6 = True`, which is fine.

  https://github.com/cloud-init/cloud-init/blob/master/cloudinit/net/sysconfig.py#L649
  This configures `IPV6_AUTOCONF=no` to be written whenever `network.use_ipv6` is `True`.
  However, in the use-case where dhcp6 is used, `IPV6_AUTOCONF` should be set to `yes`.

  Proposed fix:
  Distinguish between IPv6 being configured statically or using DHCP when writing the sysconfig file.

  Cloud-provider: AWS EC2.
  Guest OS: CentOS Linux release 7.5.1804 (Core)
  EC2 user-data provided with cloud-init config:
  ```
  #cloud-config
  package_upgrade: true
  write_files:
  - path: /etc/cloud/cloud.cfg.d/99-custom-networking.cfg
    owner: root:root
    permissions: 0600
    content: |
      network:
        version: 1
        config:
        - type: physical
          name: eth0
          subnets:
            - type: dhcp
            - type: dhcp6
  power_state:
    mode: reboot
    delay: now
    message: Rebooting post-config
    timeout: 30
    condition: True
  ```

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