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Hello! Maybe my experience will be useful:

Faced the same task - connect VMs directly to the public network. I am using Mitaka and OVS networking with separate network node (but I think this solution will work on other distros). To make direct connectivity possible I created bridges on each compute node and added interfaces connected to the public network (with names like on network node). Also I added bridge mapping in openvswitch_agent.ini on compute nodes. And now I have a possibility to use standard openstack NAT feature with floating IPs or I can directly add IPs from my public subnet to VMs!