Fail2ban
easyLog-parsing daemon that bans IPs showing malicious signs like repeated authentication failures.
0.1 GB RAM ActiveGPL-2.0
Replaces
Pros
- Battle-tested and widely used
- Very lightweight
- Extensive filter library for many services
- Easy to configure for common use cases
Cons
- Regex-based filters can be fragile
- No web UI
- IPv6 support is limited
- Cannot share threat intel like CrowdSec
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