The invention provides a data processing system for the support of secure networking on a single, virtualized hardware platform. The data processing system comprises a Network Interface Controller NIC to control access to a physical network; a first operating system comprising an NIC driver to manage the NIC, and a first Virtual Network Interface Controller VNIC driver. The system further comprises at least one second operating system comprising at least one second VNIC driver associated with a networking stack; and a Virtual Machine Monitor VMM to enable concurrent operation of the first and second operating systems, and to emulate a virtual network, the VMM comprising first and second VNICs to provide access to the virtual network by the first and second operating systems through the first and second VNIC drivers, respectively. The first operating system further comprises a bridge driver in between the NIC driver and the first VNIC driver to manage the connection between the physical network and the virtual network.