Open Stack

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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