#Iptables For RHEL / CentOS Stream / Fedora Rocky / AlmaLinux The traditional Iptables utility now configures the nftables kernel backend, while the new nft userspace tool allows the creation of more flexible rules not currently supported by iptables. Nftables ships with numerous benefits in terms of flexibility and performance when defining and deploying firewall rules, especially for systems using both IPv4 and Ipv6. Since Ubuntu 22.04 nf_table has replaced iptables as the default firewall backend system. Once installed, you can confirm if Iptables is installed using the command: iptables -version If you are running a Ubuntu / Debian server, install Iptables by running the following commands: sudo apt update In case Iptables is not installed on your distribution, here’s how you can get started. Iptables comes installed by default on most modern Linux distributions including Ubuntu, Debian, RHEL, Rocky Linux, and AlmaLinux. In this tutorial, you will learn how to manage the Linux firewall using Iptables. If no rule is found, the default policy configured is applied. If a connection is matched to a rule, a specific action is applied to the data packet based on the rule chain. Iptables monitors traffic flowing to and from a Linux server and checks to see if a connection or network packet matches a rule. Iptables uses filters organized into tables that contain a set of rules called chains that determine how network traffic packets are treated. It is a powerful security tool that keeps your system safe by blocking undesired network traffic, allowing expected traffic, redirecting packets to other TCP/UDP ports, and warding off DDoS attacks among others. Iptables is a user-space utility program for managing firewall rules on a Linux kernel.
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