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To work with floating ips you need your network node to have connection with your router. Every floating you use in openstack added on the interface on network node (in the router's net namespace) and your router routting the traffic. So from your CIDR one ip will used by the netgear and all others will added on openstack as floating ip pool.Then the neutron makes nat the floating ip to your private ip. So in your question i think the answer is "the ips actually used by the server". I think you never need to flush any arp cache. If you need any other information tell me to explain you.