Every iptables rules are directly handled by the Linux Kernel itself and it is known as kernel duty. You must have root privileges to execute each iptables rules. Linux Kernel uses the Netfilter framework so that it can provide various networking-related operations which can be performed by using iptables. Previously, ipchains was used in most of the Linux distributions for the same purpose. Normally, iptables rules are configured by System Administrator or System Analyst or IT Manager. As for example, iptables is used for IPv4 ( IP version 4/32 bit ) and ip6tables for IPv6 ( IP version 6/64 bit ) for both tcp and udp. Iptables uses different kernel modules and different protocols so that user can take the best out of it.

Iptables is an application / program that allows a user to configure the security or firewall security tables provided by the Linux kernel firewall and the chains so that a user can add / remove firewall rules to it accordingly to meet his / her security requirements. Most of senior IT professionals knows about it and used to work with it as well. What is iptables?įirst, we need to know what is iptables. Let’s begin wihtout wasting further more time. Today we will walk through iptables and firewalld and we will learn about the history of these two along with installation & how we can configure these for our Linux distributions.

Sudo iptables