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Can the controller node and the network node be the same computer?

I am having some issues setting up neutron - I have 2 nodes only, controller and network node is on the same computer. Is this a valid config? Or do they absolutely have to be separate?

I lost network connectivity to the controller/network is configured and the bridges were created by openvswitch. Perhaps using the same node for both controller/network is causing it to fail because the GRE tunnel is not valid?