Individual skill
detecting-port-scanning-with-fail2ban
Configures Fail2ban with custom filters and actions to detect port scanning activity, SSH brute force attempts, and network reconnaissance, automatically banning offending IP addresses and alerting security teams to suspicious network probing.
internal/tools/skills/data/network-security/detecting-port-scanning-with-fail2ban/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
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- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 1,323
- Repository last updated
- Nov 8, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- network-security Declared skill tag
- fail2ban Declared skill tag
- port-scanning Declared skill tag
- intrusion-prevention Declared skill tag
- automated-defense Declared skill tag
- security Derived category
Files and excerpt
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Read excerpt
# Detecting Port Scanning with Fail2ban
## When to Use
- Automatically blocking IP addresses that perform port scans against internet-facing servers
- Defending SSH, HTTP, FTP, and other services against brute force attacks with automated IP banning
- Creating custom detection filters for organization-specific attack patterns in log files
- Reducing noise from automated scanning bots before traffic reaches IDS/IPS for deeper analysis
- Implementing defense-in-depth by adding host-based automated response to network monitoring
**Do not use** as the sole network security control, for protecting against distributed attacks from many source IPs, or as a replacement for proper firewall rules and network segmentation.
## Detection Gaps & Validation
Fail2ban is per-source and log-driven, so it misses exactly the scans attackers use to stay quiet: