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The setup should still work with only one interface also [which will be used to access the dashboard as well as which will be connected to your br-tun tunnel on both controller and compute nodes for communication between the VMs/instances hosted across the two nodes - if you are using neutron, or assigned to br100 bridge if you are using Flat networking with nova network]. However, with only one NIC - what you will NOT be able to achieve is being able to assign floating IP address - if you want this only then you will definitely need one more NIC. Can you show the output of ovs-vsctl show from both nodes?