📦 Installation Command
apt install fail2ban
Fail2ban Configuration & Setup Guide
fail2ban systemctl: fail2banIntrusion prevention - bans IPs with too many failed auth attempts. Works with many services.
🔌 Default Port
N/A
N/A
Monitors logs, uses firewall for bans
⚙️ Configuration Files
/etc/fail2ban/jail.conf/etc/fail2ban/jail.local/etc/fail2ban/jail.d/defaults-debian.conf
📂 Default Directories
- config:
/etc/fail2ban - data:
/var/lib/fail2ban - logs:
/var/log/fail2ban.log - filters:
/etc/fail2ban/filter.d - actions:
/etc/fail2ban/action.d - jails:
/etc/fail2ban/jail.d
🔐 Default Credentials
Username:N/A
Password:N/A
💡 fail2ban-client requires root
📌 Dependencies
⚠️ Conflicts
✅ Works With
🛡️ Security Notes
Always create jail.local (don't edit jail.conf), whitelist your IP, set appropriate ban times, use incremental banning
❓ Frequently Asked Questions
What does Fail2ban do?
Fail2ban monitors logs and bans IPs showing malicious activity like repeated failed logins.
Where is Fail2ban config?
Config at /etc/fail2ban/jail.conf. Create jail.local for custom settings.
How to unban IP in Fail2ban?
Run: sudo fail2ban-client set <jail> unbanip <IP>