If you have an active service contract (SmartNet) for specific hardware, you can download files directly from the Cisco Software Download Physical Hardware:
images (e.g., Cisco 7200, 3725) that run via emulation. These are resource-intensive and increasingly rare. Cisco IOL (IOS on Linux): Lightweight images often found in the refplat.iso How to Add the Image to GNS3 Once you have the file, follow these steps to use it: Open GNS3 and go to Edit > Preferences IOS Routers (for Dynamips) or (for IOSv/CML images). to select your downloaded image file. download cisco ios image file for gns3
on the GNS3 Community forum to choose the right image type for your PC's performance. If you have an active service contract (SmartNet)