Firewall Rules Generator

A firewall filters network traffic, allowing or blocking connections based on defined rules. It helps protect your server from unwanted access and attacks.

Copy the generated rules and apply them using your chosen tool (iptables, nftables, ufw, or firewall-cmd). Always test before using in production — incorrect rules can lock you out.

These rules are templates. Always review, adapt to your actual services and network layout, and test in a maintenance window. The safest approach is to keep an existing SSH session open while you apply changes.

nftables is the modern Linux firewall subsystem. iptables is widely understood and still common. UFW is convenient for simple servers, and firewalld is common on RHEL-based systems.