42. Evading IDS, Firewalls and Honeypots – Detection Games
Chala mitrano, Chapter 41 madhe session tokens baghitla – aata IDS, firewall ani honeypot (फसवा सापळा). Red try karto sensors chukavnyasathi – fragmentation, slow scan, blending with "normal" traffic. Aapan he shikto defence-first: kasa attacker try karto, so Blue better detection (शोध) rules lihu shakto. He CEH exam modules madhlo detection-game chapter aahe – evasion kit / production bypass recipe nahi. Ghabru naka – OWN host-only lab (Kali 192.168.56.10, Metasploitable 192.168.56.20, optional Suricata/firewalld VM). Lakshat theva: lab = prove alerts fire. Production = protect sensors, never "silence Snort" for a client without change control.
What you will learn in this chapter
- IDS vs IPS vs firewall vs honeypot – detection vs prevention, CIA mapping
- Signature vs anomaly IDS; false positives and false negatives (Snort / Suricata ideas)
- Fragmentation, encoding, obfuscation – concepts; how modern IDS reassembles
- Slow scans, timing, port knocking – what Blue logs and rate-alerts
- Firewall types (packet filter, stateful, WAF, NGFW) and "evasion" as misconfig / allow-list gaps
- Honeypots / honeynets (Cowrie-class) – deception ethics; alert when someone pokes the fake
- Covering tracks vs log integrity (अखंडता), append-only, SIEM, NTP – Blue wins
- Lab: Suricata or firewalld logging on OWN Amazon Linux / Ubuntu VM; benign Nmap vs OWN target
- Project Build-Hack-Fix for Sahyadri Traders edge + ethics / IT Act
- Purple-team interview lines you can actually say
Lab scope
Practice only against systems you own in host-only / isolated lab (Kali 192.168.56.10, Metasploitable 192.168.56.20, optional Snort / Suricata / firewalld lab VM e.g. 192.168.56.40). Nmap, tcpdump, and sensor installs stay pointed at host-only IPs. Never scan a neighbour, ISP, cloud account you do not own, or a live shop "to see if Snort notices". Never publish IDS-bypass runbooks, never disable a customer's sensor "for a demo", never hack-back from a honeypot. IT Act sections such as 43 and 66 apply if you access others' systems without authority (verify current text). Lab = learn detection. Production = protect.
Concepts in this chapter
- 42.1IDS vs IPS vs Firewall vs Honeypot – Why Each Exists
- 42.2Signature vs Anomaly IDS – False Positives and False Negatives
- 42.3Fragmentation, Encoding, Obfuscation – Concepts, Then Reassembly
- 42.4Slow Scans, Timing, Port Knocking – Nmap vs Blue Rate Alerts
- 42.5Firewall Types – What "Evasion" Means to Blue
- 42.6Honeypots and Honeynets – Deception, Ethics, Alerts
- 42.7Covering Tracks vs Log Integrity – Blue Wins
- 42.8Lab – Suricata or firewalld Logging on OWN VM
- 42.9Project, Ethics and IT Act
- 42.10Putting It Together – Purple Team Mindset
The chapter recap is at the end of the last concept page.