Cisco router simulator

Hello, Is there any Cisco CCNA/CCNP router simulator for like Boson Netsim for Linux? I don't care if it's commercial or free. If yes, where can I get it? Are there any OpenSUSE RPMs available for this? If yes, where? Yours faithfully, -- Damian Mihai Liviu Phone: +40741226993 Yahoo: liviudm_cisco URL: http://liviudm.blogspot.com