Watch Ethical Hacking: Evading Ids, Firewalls, And Honeypots Course Direct

This one was devious. The instructor explained: "A firewall can be in front of a host, but the host's own IP stack has a Time-To-Live. If you set your TTL to expire one hop after the firewall but before the target’s IDS , your malicious packet reaches the host, but the host's response never makes it back to the firewall's state table. Asymmetric routing. The firewall forgets you exist."

She started with reconnaissance— without scanning. She used the TTL trick from earlier, sending single crafted ICMP packets with low TTLs to map the firewall’s hop count. She found the border firewall at hop 2. The HR server at hop 5. No alerts. This one was devious

He introduced her to a tool she’d overlooked: Fragroute . "Fragment your packets," he said. "Break that 'MALICIOUS-SCAN' signature across three separate packets with interleaved timing. The IDS reassembles slowly. You win." Asymmetric routing

The instructor’s tone hardened. "Firewalls are not walls. They are filters. And filters have assumptions." She found the border firewall at hop 2

She landed on a jump box. Immediately, she ran her honeypot detection script: ICMP timing test. The response was 40ms—realistic. Directory creation test: folder persisted. Safe.

The instructor’s face appeared—lean, sharp-eyed, with the calm voice of someone who had spent years on both sides of the law. "You already know how to find a vulnerability," he said. "But finding it doesn't matter if every alarm in the SOC lights up the second you touch the network. Today, we stop being loud. We become silk." The first module was on Intrusion Detection Systems (IDS). Maya had always treated IDS like a background nuisance—something to check after a scan. The instructor flipped that thinking on its head.

"Low-interaction honeypots like Cowrie mimic an SSH server but don't actually run commands—they just log. Test them: send a command that has a unique side effect, like mkdir /tmp/.test-$(date +%s) . A real system creates the directory. A honeypot logs the string but never makes the folder. Check if it exists."