1. A method comprising: deploying a first virtual system configuration on a physical network, the first virtual system configuration including a first virtual machine (VM) assigned a first internet protocol (IP) address; and deploying a second virtual system configuration on the physical network that includes a second VM assigned the first IP address to communicate within the second virtual system, wherein the second VM in the second system is also assigned a second IP address for communication on the physical network with machines outside of the second virtual system.