Simics Network Simulation
Simulate complex heterogeneous networks of multiple machines, boards, and racks with Wind River® Simics®. Using multi-core hosts, you can simulate very large networks, inspect all traffic, inject faults, and connect the virtual network to the outside world. Stop the entire network synchronously, save it as a checkpoint, and pick it up later. For more information, see http://www.windriver.com/products/simics and http://www.windriver.com/simics/.