42. Evading IDS, Firewalls and Honeypots – Detection Games
42.10 Putting It Together – Purple Team Mindset
Thodkyaat: this chapter = sensors exist for a reason + Red will try to look normal + Blue reassembles, rate-alerts, allow-lists egress, deceives with isolated honeypots, and ships logs off-box. Tools change; habit (own-lab only, tune don't mute, authorization) rahate.
Interview model (clean English): "I study IDS and firewall evasion as a defender. In the lab I generate ordinary Nmap against my own Metasploitable and Suricata/firewalld VM, then I prove the alert and tighten HOME_NET and allow-lists. I do not run bypass toolkits on networks I do not own, and I treat outbound C2 and trusted-channel abuse as first-class detections."
| Red team (attacker) does | Blue team (defender) detects / stops |
|---|---|
| Full chain in lab: open firewall → quiet scan → hope no log | Purple: nmap -T2 + fast.log/denied + tuned rich rule proven |
| Shames SME after missed scan | Helps Raja/Rani read one alert, fix HOME_NET, enable egress logging |
Ravindra Bagale's Tip
Session chapter madhe token hygiene; itha sensor hygiene. Donhi without logs = storytime. Aata pudhe IoT / OT – cameras and plant networks, still ethics-first!
Lab
Chapter project (42.9 box) complete kara. Mag 10 flashcards: IDS, IPS, signature, anomaly, FP, FN, reassembly, slow scan, honeypot, egress C2. Pair: ek Red "how traffic tries to look boring", ek Blue "which log line proves we saw it".
Thodkyaat sangaycha tar
- Firewall = policy gate; IDS detects; IPS can block inline; honeypot = fake asset nobody honest should touch.
- Evasion lessons exist so Blue writes reassembly, egress, and rate detections – not so students bypass production.
- Signature vs anomaly; recite false positive vs false negative; tune, don't mute.
- Fragmentation / encoding = why modern Snort/Suricata parse and reassemble; no fragroute runbook in this book.
- Slow Nmap and port knocking still leave crumbs –
firewall-cmdlogs, Suricata thresholds, netflow. - "Firewall evasion" in real SME work is often misconfig and allow-list gaps (outbound 443,
0.0.0.0/0). - Honeypots (Cowrie-class) are high-confidence tripwires when isolated; never hack-back.
- Covering tracks loses if logs are off-box, clocks are synced, and service heartbeats exist.
- Lab: Suricata and/or firewalld on OWN
.40;nmap -sS -T2to OWN.20/.40; read alerts. - Ethics / IT Act; Project Build-Hack-Fix for Sahyadri Traders Pune edge.
Samjla ka? IDS-firewall-honeypot detection games shiklo – pan pratyek sobat bachav ani safe lab. Pudhchya chapter madhe **IoT and OT security** (cameras, plant networks, still ethics-first) – CEH modules pudhe. Chala pudhe, mitrano!