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How to access instances from the outside world?

We've created a few instances on our MAAS+Juju+Openstack cloud. All these instances have been assigned private IPs but can access the internet via NAT. Only our MAAS cluster controller node has a public IP. Now how should we access these instances from the outside world?. Should we assign separate unique public IP address to each of these instances or is it possible to access them all without public IPs via NAT?

I understand there is a concept of associating a floating IP to an instance from a pool of IPs. But where shall I get the IP addresses that are required to be added to the pool?