Abstract: A virtual computing environment comprising virtual machines may be created to clone a computing environment for testing purposes. To provide an accurate testing environment, the network configuration of the cloned computing environment may be preserved in the virtual computing environment. However, deploying the virtual computing environment on a physical network that comprises the cloned computing environment may create addressing conflicts. Accordingly, a technique for preserving network configuration data without creating addressing conflicts is provided herein. A virtual computing environment comprising an internal virtual network and external virtual network is fenced off to isolate the virtual computing environment from a physical external network. The virtual computing systems are connected to the internal virtual network for communication, using the preserved network configuration, between virtual computing environments.