Sometimes we want to disable the firewall just for testing purpose on the server. This is not recommended to disable the firewall on the server but we can do it for testing purpose only. There is a firewall daemon called firewalld.
By default, Firewall is enable and you can use this command if you make some changes in firewall
Daemon is a unix or linux type of program that runs in the background and performs a specified operation.
In redhat 7, firewall daemon is firewalld and In redhat 6, iptables used for firewall
Check status of firewall by systemctl status firewalld
Stop the firewall by systemctl stop firewalld
Stop the firewall by systemctl disable firewalld
This means firewall is disable which will be in active mode and won’t start at boot time.
Stop the firewall by systemctl enable firewalld
This mean firewall will be start at boot time.
Check pre-defined firewall rules by ls -lrt /usr/lib/firewalld/zones/