A system for a universal network configuration engine includes a client machine which interfaces to an extensible library of data about network elements, such as routers, switches, hubs and other devices. The elements may be made by diverse manufacturers and use different protocols. However, a unified user interface on the client permits a network administrator to access, update, configure and otherwise manipulate the network elements of a new or existing network, using a single tool which abstracts the hardware and software interfaces, for instance using object oriented code. The client may have a port to the physical or virtual network being configured, for hot testing or other purposes.