# Fail2ban

Fail2ban is an Intrusion Detection and Prevention Systems product. It runs on-premises. Pricing is free.

Fail2ban is a daemon that automatically bans IP addresses showing malicious behavior by monitoring log files and updating firewall rules to prevent brute-force attacks.

## What is Fail2ban?

Fail2ban is a daemon that monitors log files for suspicious activity and automatically implements IP address bans through firewall rule modifications.

The tool scans various log files to identify patterns indicative of malicious behavior, such as repeated authentication failures, brute-force attempts, and other attack signatures. When suspicious activity is detected from a specific IP address, Fail2ban temporarily blocks that address by updating firewall rules.

The daemon operates by parsing log entries in real-time and applying configurable filters to identify potential threats. It supports multiple services including SSH, HTTP, FTP, and other network services that generate log entries. The tool can be configured with custom rules, ban durations, and threshold settings to match specific security requirements.

Fail2ban integrates with various firewall systems including iptables, firewalld, and other packet filtering mechanisms. It maintains a database of banned IP addresses and can automatically remove bans after specified time periods. The tool also supports whitelisting of trusted IP addresses to prevent accidental blocking of legitimate traffic.

Tags: Linux, Brute Force

## Where it fits in your security program (NIST CSF 2.0)

- [Detect](https://cybersectools.com/guides/building-detect-program-small-team): helps you spot attacks and unusual activity.
- [Respond](https://cybersectools.com/guides/building-respond-program-small-team): helps you contain and handle incidents.

## Quick facts

- Category: [Network Security](https://cybersectools.com/categories/network-security) · [Intrusion Detection and Prevention Systems](https://cybersectools.com/categories/idps)
- Deployment: On-Premises
- Company size fit: Startup, SMB, Mid-Market, Enterprise
- Pricing model: Free
- Website: fail2ban.org

## Where it ranks

No shortlist covers this product's category yet. The closest is [Best SASE Solutions for Business](https://cybersectools.com/shortlists/best-sase-solutions).

## Fail2ban FAQ

### What is Fail2ban?

Fail2ban is a product in the Intrusion Detection and Prevention Systems category. It covers Linux and Brute Force.

### What is the pricing for Fail2ban?

Fail2ban is free. Download and setup instructions are at https://www.fail2ban.org/wiki/index.php/Main_Page/.

### What are alternatives to Fail2ban?

Alternatives to Fail2ban listed on CybersecTools:

1. [Allumetis](https://cybersectools.com/tools/allumetis) - Automated brute-force detection & blocking for on-prem Exchange Server. (Commercial)
2. [Trellix Intrusion Prevention System](https://cybersectools.com/tools/trellix-intrusion-prevention-system) - Next-gen IPS detecting & blocking network threats via signatures & behavior (Commercial)
3. [Trend Micro TippingPoint Threat Protection System](https://cybersectools.com/tools/trend-micro-tippingpoint-threat-protection-system) - Inline network detection and response system with IPS capabilities (Commercial)
4. [OpenText Core DNS Protection](https://cybersectools.com/tools/opentext-core-dns-protection) - Cloud-native DNS filtering solution that blocks malicious domains and threats (Commercial)
5. [Intrusion Shield](https://cybersectools.com/tools/intrusion-shield) - Network threat protection platform blocking malicious IPs using reputation intelligence. (Commercial)

Compare all Fail2ban alternatives at [https://cybersectools.com/alternatives/fail2ban](https://cybersectools.com/alternatives/fail2ban)

### What deployment and organization size does Fail2ban fit?

Fail2ban is available as on-premises. It is listed for startup, smb, mid-market and enterprise organizations. It is free.

## Compare Fail2ban with similar solutions

- [Fail2ban vs Allumetis](https://cybersectools.com/compare/allumetis-vs-fail2ban)
- [Fail2ban vs Trellix Intrusion Prevention System](https://cybersectools.com/compare/fail2ban-vs-trellix-intrusion-prevention-system)
- [Fail2ban vs Trend Micro TippingPoint Threat Protection System](https://cybersectools.com/compare/fail2ban-vs-trend-micro-tippingpoint-threat-protection-system)

All alternatives to Fail2ban: [/alternatives/fail2ban](https://cybersectools.com/alternatives/fail2ban)

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Source: https://cybersectools.com/tools/fail2ban

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