Iptables Essentials: Common Firewall Rules and Commands

**Iptables Essentials: Common Firewall Rules and Commands**

Introduction The iptables utility is a software firewall for Linux distributions that lets you control how network traffic is handled by the Linux kernel. With iptables, you can define rules that match traffic by properties like protocol, port, source or destination address, and network interface, and then decide whether to allow it, block it, or log it. These rules are organized into tables and chains (such as the INPUT, OUTPUT, and FORWARD chains) and are evaluated from top to bottom, which makes rule order an important part of getting the behavior you expect. This cheat sheet-style guide provides a quick reference to iptables commands for common, everyday scenarios on Ubuntu 24.04. It includes examples of allowing and blocking services by port, network interface, and source IP address, along with guidance on rule ordering, persistence, and basic safety checks...

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