In this video i will show you how to install, configure and setup GNS3 with routers and ASA firewalls. Also, I have already changed the battery in my smoke detector :)
Links in the video used:
GNS3
http://www.gns3.net/download/
IOS images
http://www.careercert.info/2009/05/ne...
ASA configuration guide and software:
http://www.xerunetworks.com/2012/02/c...