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Creating a Lightweight Linux Firewall with UFW and fail2ban
- In this guide, a lightweight Linux firewall is created using UFW and fail2ban for robust security with minimal resource consumption.
- UFW simplifies iptables configuration, while fail2ban bans IPs showing malicious behavior like repeated login failures.
- The combination controls service accessibility, blocks brute force attacks, and deters network-based threats.
- Setting up UFW involves installation, basic configuration, allowing essential services, working with service names, and enabling IP-specific rules.
- Managing UFW includes commands for checking status, deleting rules, and disabling the firewall.
- Installing fail2ban, customizing configurations, creating jails, and starting fail2ban are part of setting up this intrusion prevention system.
- Advanced configurations cover rate limiting with UFW, creating custom fail2ban filters, whitelisting IPs, and monitoring banned IPs.
- Best practices include testing configurations, regular audits, frequent updates, layered security, backups, and emergency access plans.
- Troubleshooting addresses common issues like 'Connection refused,' fail2ban not banning IPs, and being locked out of SSH.
- By combining UFW and fail2ban, a powerful yet resource-efficient firewall solution is established for Linux servers, enhancing security while being easy to manage.
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