Cisco Packet Tracer is a comprehensive networking simulation software tool for teaching and learning how to create network topologies and imitate modern computer networks.

That's for simulation. I don't think it's possible to analyse a running system to find trace packets as they go through the firewall.

Cisco Packet Tracer is available for free to all Cisco Networking Academy instructors, students, and alumni. Sign up for our free Getting Started with Cisco Packet Tracer course to learn how to download, install, and get started.

And it also requires a paid account to use.

[–] Saffire@sh.itjust.works 1 points 5 hours ago* (last edited 5 hours ago)

You simulate your exact network setup and then run testing on that. Also I was able to download a free copy to use for free for a 3 month period if you sign up for an account on that website I linked. It was fairly convoluted and a pain to get, but I was able to download and use it.