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How to setup network topology and floating IP pool with VirtualBox?

Dear all,

I have installed 3 VMs nodes(controller, network and compute) on my desktop. My desktop is with Windows 7 Enterprise and Virtual Box 5.1.26. All VMs are CentOS7. Each VM has 3 network interfaces, host-only, NAT and bridged. Accordingly, the interfaces are enp0s3, enp0s8 and enp0s9. They are assigned IP addresses as (static), (static) and (static) respectively. I don't know how to create a network topology on the controller node. Which IP goes for private, which goes for router and its interface(s), and which goes for external/public? And how to create floating IP pool? Can any one give me some instructions please? Many thanks in advance.

Best regards,