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[Major Hayden <1976526@xxxxxxxxxxxxxxxxxx>]

** Bug watch added: Red Hat Bugzilla #2092459
   https://bugzilla.redhat.com/show_bug.cgi?id=2092459

** Also affects: cloud-init (Fedora) via
   https://bugzilla.redhat.com/show_bug.cgi?id=2092459
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1976526

Title:
  IPv6-enabled EC2 subnets always have dhcp enabled

Status in cloud-init:
  New
Status in cloud-init package in Fedora:
  Unknown

Bug description:
  A Fedora user opened an issue[0] about an issue with cloud-init on
  EC2. When they launch an instance on a IPv6-enabled subnet, cloud-init
  sets the `ipv6.method` to `dhcp` in NetworkManager.

  However, AWS uses router advertisements to let instances know about
  the nearest router. Using the `ipv6.method: dhcp` setting prevents
  router advertisements from working. The instance ends up with an IPv6
  address assigned, but it cannot route traffic.

  A workaround is to run NetworkManager commands to fix the issue:

  ```
  nmcli con edit CONNECTION_UUID
  nmcli> set ipv6.method auto 
  nmcli> save
  nmcli> activate
  ```

  The instance immediately routes IPv6 traffic after making that change.
  The dhcp setting appears to be applied automatically for EC2 subnets
  with IPv6 addresses assigned[1].

  I would expect `ipv6.method` to be `auto` in these situations.

  Thank you!

  [0] https://pagure.io/cloud-sig/issue/382
  [1] https://github.com/canonical/cloud-init/blob/53a995e2f852d043d51ad25c1b9afbbe1edafd57/cloudinit/sources/DataSourceEc2.py#L861-L863

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