Friend

have a look at dynamips which i feel is the best when it comes to router simulators.

www.ipflow.utc.fr/index.php/Cisco_7200_Simulator

Read the tutorials for installation and for creating sample toplogies

HTH, rate if it does

Narayan

Hi,

I add my voice to both Narayan and Danilo, dynamips/dynagen is the best simulator by far, as you can test all the real life cases without restrictions, but you'll need to have the appropriate IOSs and a strong machine to run many routers.

http://www.dynagen.org/

HTH,

Mohammed Mahmoud.