And they're available inexpensively or even free.īuying used gear is most often technically just as illegal as grabbing the images from some file sharing site because the licenses are not transferable. There are a lot of switches, routers, and firewalls out there that, although not the latest, are still quite functional. If your goal is to run GNS3, then you need to get the IOS images in an appropriate way.īut, if you're trying to work with a lab setup, consider getting the actual physical gear.