Virtual Network (vnet)
A virtual network (vnet) allows application instances to migrate seamlessly among compute nodes without changing their networking configurations.
Network Function Virtualization (NFV) Instance
When you create a vnet, the Ignite management console manages all DHCP and NAT services via an auto-deployed application instance called the Network Function Virtualization or NFV instance. There is one NFV instance per vnet. The NFV instance functions like any other application instance in your cloud infrastructure: it resides in a virtual datacenter and consumes resources from a migration zone and storage pool. It uses the gateway IP address for your vnet.