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Allocate public IP to instances

Hi Everyone,

I am currently running a PoC on openstack Juno with 1 controller, 1 network and 1 compute node on Ubuntu 14.04. I am hoping i will be able to configure VLAN's and tenant networks and then simply map them to the VLAN's on the physcial switch.

To proceed i wanted to find out Is it possible to directly assign public IP addresses to instances rather than creating new private tenant subnets and then mapping those to public IP addresses(Floating IP's). We are trying to avoid reconfiguring IP addresses to the existing VM's which we will be moving to the openstack environment. Can someone point me to how can we achieve this?