Here, we create an overlay network between three VMs running on Virtual Box. Instead, the internal interface obtains an IP address, and the host would be accessible. The internal interface is used because you may lose your connectivity when trying to build a bridge and connect your physical interfaces to it since they would not get an IP (switches work in layer 2). To create an overlay network, we need to create an internal interface. OVS is a multilayer virtual switch designed to enable massive network automation through programmatic extension.
You can also join other machines to this network and have connectivity between all of them using the overlay IPs. By creating an overlay network, you can have a new interface attached to your system with any arbitrary IP that you would like.
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