Security considerations

Here are the Security Best Practices for Pi-hole:

1. Network Segmentation
   • Place Pi-hole on a dedicated VLAN or subnet to restrict its access to sensitive devices
2. DNS Encryption
   • Implement DNS-over-HTTPS (DoH) or DNS-over-TLS (DoT) to secure DNS requests from interception
3. System Maintenance
   • Keep Pi-hole, operating system, and all associated software up to date with the latest security patches
4. Firewall Configuration
   • Configure firewall rules to allow access only from internal devices
   • Block all external access attempts
5. SSH Hardening
   • Disable root login capabilities
   • Implement key-based authentication
   • Change the default SSH port
6. Web Interface Security
   • Configure HTTPS using either a self-signed or trusted SSL certificate
   • Set a strong, unique password for admin access
7. Monitoring
   • Enable and review DNS query logs to detect suspicious activity
8. Service Management
   • Disable any unnecessary services (like DHCP) that aren't being used
9. Data Protection
   • Maintain regular backups of Pi-hole configurations and settings
   • Test backup restoration procedures periodically
10. Access Management
    • Restrict administrative access to specific, trusted IP addresses

Following these security measures will help protect your Pi-hole installation from both internal and external security threats.