This use case is an extension of the above Flat Network use cases. In addition to being able to see one or more shared networks via the OpenStack Networking API, tenants can also have access to private per-tenant networks (only visible to tenant users).
Created VMs can have NICs on any of the shared or private networks that the tenant owns. This enables the creation of multi-tier topologies that use VMs with multiple NICs. It also enables a VM to act as a gateway so that it can provide services such as routing, NAT, and load balancing.
