GNS3 is a graphical network simulator that allows you to design complex network topologies. You may run simulations or configure devices ranging from simple workstations to powerful Cisco routers. It is based on Dynamips, Pemu/Qemu and Dynagen.
excelent.. <a href="white-vps.com" rel="dofollow">White-vps</a>
me gusta, pero le falta algo aún