The firewalld is the default firewall service used in CentOS 7 and RHEL 7.  This service replaces traditional IPTABLES used in earlier versions of the Linux operating systems. Firewalld organizes rules in various zone. There…

It is a challenging task to create the perfect iptables rules allowing only the required traffic. *** VERY IMPORTANT* **  Before making any changes in the iptables ensure that you have console access to the host…