How can I whitelist specific Cloudflare IPs in a firewall (e.g., iptables, AWS Security Groups)?

The method for whitelisting depends on your firewall system. For example, in iptables, you might use commands like `iptables -A INPUT -s 192.0.2.0/24 -j ACCEPT`. In AWS Security Groups, you would add an inbound rule allowing traffic from the Cloudflare IP ranges. Refer to your firewall's documentation for specific instructions.