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external network packets to network node

I have done a kilo ubuntu installation of openstack. One thing i noticed was the network node's external interface is unnumbered. Then how does the external router forwards the packet to the network node? Suppose a vm has a floating ip . I send a packet to that vm using the floating ip. The nat happens at the network node. How does the packet reached the network node as there is no ip assigned to the interface. I have not configured dvr and l3 agent is running on network node.