Comment 8 for bug 1279645

The intent of adding external_gateway_info was to avoid the races where other resources had to have a workaround to depend on RouterGateway. (afaict this is just the FloatingIP resource.)

So if we copied the hack from https://github.com/openstack/heat/blob/master/heat/engine/resources/neutron/router.py#L273 then we are no worse off than before, though it would be nice to be better.

What would really be nice is if the router-gateway property referenced a Subnet instead of a network. But this is not how the underlying API works - that seems to just silently pick a subnet (which one? how?) from the network provided and silently add an interface on it - an interface you can't find or access if you wanted to refer to it when creating, say an ExtraRoute, but which nevertheless stops you from deleting the subnet.

The more I see of the Neutron API, the less I understand it :(