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[Slawek Kaplonski <1818224@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When L3HA router is created, it is first transitioned to backup on all
nodes. In such case IPv6 forwarding is disabled in router's namespace.
It was introduced by commit
https://github.com/openstack/neutron/commit/676a3ebe2f5b62f0ce7a3f7f434526931d5504a5

Later router is transitioned to be master on one of nodes. And then IPv6
forwarding should be enabled. Unfortunately it is enabled only when
gateway is configured:
https://github.com/openstack/neutron/blob/929d3fe9f49aeea817c8a922d0b28d605cc9b562/neutron/agent/l3/router_info.py#L704

So if there is no gateway connected to router and it has only tenant
networks ports, IPv6 forwarding will not be turned on and IPv6
connectivity between subnets will not be possible.

** Affects: neutron
     Importance: High
     Assignee: Slawek Kaplonski (slaweq)
         Status: New


** Tags: l3-ha

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https://bugs.launchpad.net/bugs/1818224

Title:
  IPv6 forwarding disabled on L3HA routers without gateway

Status in neutron:
  New

Bug description:
  When L3HA router is created, it is first transitioned to backup on all
  nodes. In such case IPv6 forwarding is disabled in router's namespace.
  It was introduced by commit
  https://github.com/openstack/neutron/commit/676a3ebe2f5b62f0ce7a3f7f434526931d5504a5

  Later router is transitioned to be master on one of nodes. And then
  IPv6 forwarding should be enabled. Unfortunately it is enabled only
  when gateway is configured:
  https://github.com/openstack/neutron/blob/929d3fe9f49aeea817c8a922d0b28d605cc9b562/neutron/agent/l3/router_info.py#L704

  So if there is no gateway connected to router and it has only tenant
  networks ports, IPv6 forwarding will not be turned on and IPv6
  connectivity between subnets will not be possible.

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