[libvirt-users] What is the best virtual network for my case?

I have an openvswitch switch controlled by a controller. I want to have a group of virtual machines which can be on different nodes but sharing the same ip address thus having the illusion of being on the same network. So, each vm I start gets an ip (I was thinking about something like 192.168.y.x 255.255.0.0 where y would be the node and x the vm, this way each node can have its own dhcp server) which is virtual and belongs to the same network of the others. Throught openvswitch I would take care of the communication between different machines if they belong to different phisical networks. So, what is the best network configuration according to you?