You could check for any detail the link provided by Bogdan.
Just to mention that GNS3/Dynamips is an emulator, unlike PacketTracer or Boson etc, which are simulators.
It runs the real IOS (so you need to have the IOS image of the router you want to run on GNS3) under Windows or Linux, taking up some important amount of system RAM and CPU, so you need to tweak it in order to be able to run several routers. At that link you'll find all the needed info and step-by-step installation and usage guide. You could find as well discussions around GNS3 on several forums which could help as well.
Dynamips/Dynage or GNS3, they all have a small "problem": it emulates only the routers, not the switches. There is a workaround also: put a switch module (16-ESW, I think)in the router and you have also a switch. But with router IOS CLI.
I tried it last night, does look alot more powerful than PacketTracer...but I have to get some IOS code, as when I tried to get to a router, it wouldnt let me as I had to invoke the code....for every device...I am going to get some from school and use it, thanks for the info.
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