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Includes advanced traffic recognition capabilities (NBAR2) to analyze over 1,000 applications.

Ensure the file has executable permissions on the Linux host ( chmod +x ).

Because this is a Linux binary, it needs "execute" permissions. GNS3 usually handles this, but sometimes you manually need to chmod +x the file within the GNS3 VM.

: 15.4(1)T, a "Development Test" release compiled in November 2013.

Indicates this is a Linux-based binary compiled for Intel x86 architecture. Unlike traditional IOS images that run on proprietary Cisco hardware MIPS/PowerPC processors, this is designed to run as a process inside a Linux VM (which is how GNS3 and VIRL operate).

Dynamic Inspection (DAI), IP Source Guard, and Zone-Based Firewalls. How to Use the Image