Watch Ethical Hacking: Evading Ids, Firewalls, And Honeypots Course 2021 -

She connected to a "Linux server" provided in the lab. It looked perfect—Ubuntu banner, bash prompt. She typed the test command. Then she tried to ls /tmp/ . No directory. Honeypot. She disconnected immediately.

Most firewalls allow outbound SSH (port 22) and DNS (port 53). He showed her how to tunnel a reverse shell over DNS requests. "Firewalls trust DNS," he said. "After all, how else will users resolve google.com?" She connected to a "Linux server" provided in the lab

Now for the firewall evasion. From the DMZ box, she launched her DNS tunneling script. The firewall’s App-ID saw standard DNS requests to an external server she controlled. It allowed them. Inside those DNS queries, her reverse shell rode out, then back in to pivot to the internal network. Then she tried to ls /tmp/

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. She disconnected immediately

The instructor’s tone hardened. "Firewalls are not walls. They are filters. And filters have assumptions."

Firewalls act as the first line of defense. The goal of evasion here is to bypass the filtering rules without being blocked.

Passive systems that monitor traffic for suspicious patterns (signatures) or anomalies and alert administrators.