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How to configure networking when Controller and Compute are connected together through one public interface

Here is my networking architecture:

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I have only one network interface on each of my compute and controller nodes both directly connected to the public network in a same subnet.

I have installed glance on the controller and stored an image on it successfully. I also have installed nova on the compute node in order to make it possible for it to launch virtual machines. However, I'm stuck in the networking part. What configurations should I follow to enable networking for the compute nodes?

The official online guide assumes that each computer has two network interfaces (one for public access and another for connecting them together in a private network).