i86bi-linux-adventerprisek9-ms.154-1.t-antigns3.bin
/opt/unetlab/wrappers/unl_wrapper -a fixpermissions
The naming structure breaks down as follows: i86bi-linux-adventerprisek9-ms.154-1.t-antigns3.bin
| Token | Value | Meaning | |-------|-------|---------| | i86bi | Intel 86 binary | Indicates the image is compiled for x86 architecture (not ASIC-dependent). | | linux | OS target | Runs as a Linux user-space process, not on bare metal. | | adventerprisek9 | Feature set | Advanced Enterprise + K9 (Cryptographic support including SSH, IPSec, 3DES/AES). | | ms | Modular/Standard | Indicates modular packaging (vs. universal). | | 154-1.t | Version | IOS version 15.4(1)T (T = Technology train). | | antigns3 | Build ID | Internal Cisco build identifier; likely a patch or engineering build for testing/antigns related fixes. | i86bi-linux-adventerprisek9-ms
The sub-tag antigns3 does not appear in any official Cisco documentation for VIRL or CML. This has led the networking community to believe that this particular BIN image was: The naming structure breaks down as follows: |
Cisco historically added anti-emulation tricks (e.g., IOS on IOU and GNS3 detection). antigns3 might mean “anti-GNS3 version 3” – ironically, modified by crackers to remove those checks.
If you use this image in a commercial lab, you risk violating Cisco’s licensing. In personal study, it’s a gray area. Many certification candidates use it for CCIE prep but eventually move to CML-Personal ($199/year) for legitimacy.