Firewall Rules Guide

Configure firewall rules to protect your servers and networks. Covers iptables, nftables, ufw, and cloud security groups with common rulesets for web applications.

Usage

Ask about configuring firewall rules for your server, understanding rule ordering, or setting up firewalls for specific application architectures.

Examples

• "What firewall rules should I set for a web server?"
• "How do I configure ufw for my Node.js application?"
• "Explain the difference between stateful and stateless firewalls"

Guidelines

• Start with a default deny policy and explicitly allow needed traffic
• Order rules from most specific to least specific for efficiency
• Allow SSH from specific IPs only, not from anywhere
• Use stateful firewalls that track connection state automatically
• Document every firewall rule with a comment explaining its purpose