It’s a tool to secure, filter out, and block Internet traffic from accessing your Linux OS. It’s a simple, a fast, and a powerful firewall installed on most Linux distributions. Iptables is an administration tool for IPv4 packet filtering and NAT. We will learn how to start, stop, flush and restart the service, how to secure CentOS 7 after the installation process, and how to save our rules for loading it at Boot time “make a persistent rule”. Set the default chain policy for INPUT, OUTPUT, and FORWARD chains. We will learn how to configure iptables for basic usage. This require us to install additional package and disable the exiting firewalld on Redhat 7 / CentOS 7 / Scientific Linux 7 Linux systems. In RPM Linux Family release 7 iptables firewall is not the default firewall, instead of it Redhad/CentOS is using Firewalld as the default firewall in any installation type “Minimal installation, Server installation, Server with GUI installation, etc.”. ![]() ![]() I’ll go and configure the iptables rules on RPM Linux Family releases 7 “CentOS 7”. This is the first step every experienced sysadmin must do Just after finishing installing the Linux OS “any member in any Family of Linux systems”. In this article we will setup and configure Basic iptables on Linux systems (RPM Family “Redhat 7/CentOS 7/Scientific Linux 7”).
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