The most recent variants of Centos and Fedora are using a service called '''firewalld''' that is intended to replace '''iptables''', however the ''iptables'' service is still in relatively common usage. In this course we will concentrate on ''iptables''.

<ol><li>Disable firewalld:

systemctl disable firewalld

systemctl stop firewalld

</ol>

<ol><li value="2">Install and enable the IPTables services:

yum install iptables-services

systemctl enable iptables