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To use IOU legally , you should use images (IOSv). However, for legacy learning and home labs, "IOU" images are widely discussed in the community. How to Set Up IOU L3 in GNS3 (The Short Version) Assuming you have acquired an L3 IOU image (e.g., i86bi_linux_l2-adventerprisek9-ms or similar):
Use it as a learning tool, respect software licensing, and upgrade to CML images when you need 100% feature parity with modern hardware. Do you still use IOU in your labs? Or have you switched entirely to EVE-NG? Let me know in the comments below!
If you have been in the networking simulation space for more than a few years, you remember the "dark ages" of slow QEMU images and the constant fight for RAM. Then came , and it changed everything.
If you are studying for the and focusing on advanced routing (OSPF, EIGRP, BGP) or MPLS , IOU L3 on GNS3 is still the gold standard for performance.