I have a very complex Openstack deployment for NFV. It could not be deployed as Flat. It will have a lot of isolated private networks. Some interfaces of a group VM instances will need bridged network with their fixed IP addresses to communicate with outside world while other interfaces from the same set of VM should keep isolated with real private/fixed IP addresses. What happen if we use public IP addresses directly as fixed IP on those interfaces ? Will this work with Openstack neutron networking ? Will Openstack do NAT automatically on those ?
Overall, the requirement is to use the fixed/public IP to communicate with outside directly on some interfaces of some VM instances while keeping others as private. The floating IP is not an option here
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