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[Tobias Urdin <tobias.urdin@xxxxxxxxx>]

Public bug reported:

When I disabled a router, changed it to L3 HA and enabled it again all
the logic that was implemented in [1] did not seem to work.

Please see the thread on ML [2] for details.
The backup router had the net.ipv6.conf.qr-<interface>.accept_ra values for the qr interfaces (one for ipv4 and one for ipv6) set to 1.

On the active router the net.ipv6.conf.all.forwarding option was set to
0.

After removing SLAAC addresses on the backup router, setting accept_ra
to 0 and enabling ipv6 forwarding on the active router it started
working again.

Please let me know if you need anything to troubleshoot this here or on
IRC (tobias-urdin).

Best regards
Tobias

[1] https://review.openstack.org/#/q/topic:bug/1667756+(status:open+OR+status:merged
[2] http://lists.openstack.org/pipermail/openstack-dev/2018-August/133499.html

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1787919

Title:
  Upgrade router to L3 HA broke IPv6

Status in neutron:
  New

Bug description:
  When I disabled a router, changed it to L3 HA and enabled it again all
  the logic that was implemented in [1] did not seem to work.

  Please see the thread on ML [2] for details.
  The backup router had the net.ipv6.conf.qr-<interface>.accept_ra values for the qr interfaces (one for ipv4 and one for ipv6) set to 1.

  On the active router the net.ipv6.conf.all.forwarding option was set
  to 0.

  After removing SLAAC addresses on the backup router, setting accept_ra
  to 0 and enabling ipv6 forwarding on the active router it started
  working again.

  Please let me know if you need anything to troubleshoot this here or
  on IRC (tobias-urdin).

  Best regards
  Tobias

  [1] https://review.openstack.org/#/q/topic:bug/1667756+(status:open+OR+status:merged
  [2] http://lists.openstack.org/pipermail/openstack-dev/2018-August/133499.html

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