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: These images are internal Cisco property and are not officially available for public download. They are typically sourced from the Cisco Modeling Labs (CML) or community repositories like Stability Warning

This is a Cisco virtual router image (IOSv L3) suitable for advanced routing labs, including encryption and MPLS. It behaves almost identically to a physical Cisco ISR G2 router but runs in a VM or emulator. : These images are internal Cisco property and

: This is an ELF 32-bit LSB executable designed for Intel-x86 Linux systems. If you are running it on modern 64-bit systems or ARM-based Macs (M1/M2), you may need 32-bit support libraries or QEMU user emulation. The "Extra - long paper" Context "Extra - long paper" : This is an ELF 32-bit LSB executable

: After uploading, you must fix the permissions by running the following command in the EVE-NG CLI: /opt/unetlab/wrappers/unl_wrapper -a fixpermissions Those newer releases contain bug fixes and security

If you cannot locate the exact image, Cisco often provides a “recommended upgrade path” (e.g., 15.5(2)S or 15.6(3) ). Those newer releases contain bug fixes and security patches while staying compatible with the same hardware.

IOU images require a iourc license file. Without this file, the image will not boot. You must generate this specifically for your VM's hostname and host ID.