Comment 15 for bug 1844712

Neutron does block DHCP/RA from instances by default:

https://github.com/openstack/neutron/blob/master/neutron/agent/linux/openvswitch_firewall/firewall.py#L929

But not from router/dhcp ports.

Are all these instances sitting on a shared network where they can see multiple neutron routers? I still don't have a clear picture.