Need to install firewalld in your system, run the following command as root access,

Install:

# yum install firewalld

Also install this graphical user interface tool firewall-config, 
 
# yum install firewall-config

Enable / Disable :

To enable a firewalld service to be started on bootup:
 
# systemctl enable firewalld.service


ln -s '/usr/lib/systemd/system/firewalld.service'

'/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service'

ln -s '/usr/lib/systemd/system/firewalld.service'

'/etc/systemd/system/basic.target.wants/firewalld.service'

To disable a firewalld service to be started on bootup:
 
# systemctl disable firewalld.service


rm '/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service'

rm '/etc/systemd/system/basic.target.wants/firewalld.service'

Start/Stop  firewalld :

Start or stop or check the status of firewalld run the following commands,
 
# systemctl start firewalld

# systemctl status firewalld

# systemctl stop firewalld


firewalld.service - firewalld - dynamic firewall daemon

   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled)

   Active: active (running) since Thu 2015-02-26 11:05:44 IST; 1s ago

 Main PID: 5741 (firewalld)

   CGroup: /system.slice/firewalld.service

           ├─5741 /usr/bin/python /usr/sbin/firewalld --nofork --nopid

           └─6012 /usr/bin/python /usr/sbin/firewalld --nofork --nopid

Another command is firewall-cmd to connect to the daemon
 
# firewall-cmd --state
running


To know the interface assigned to a zone,
 
# firewall-cmd --zone=public --list-interfaces
p4p1


Also we can view the network zones currently active, 
 
# firewall-cmd --get-service


amanda-client bacula bacula-client dhcp dhcpv6 dhcpv6-client dns ftp

high-availability http https imaps ipp ipp-client ipsec kerberos kpasswd ldap

ldaps libvirt libvirt-tls mdns mountd ms-wbt mysql nfs ntp openvpn pmcd

pmproxy pmwebapi pmwebapis pop3s postgresql proxy-dhcp radius rpc-bind samba

samba-client smtp ssh telnet tftp tftp-client transmission-client vnc-server

wbem-https


To reload the firewall with out interrupting user connections run below command,
 
# firewall-cmd --reload
success


To Check firewalld version :
 
#  firewall-cmd --version
or
# firewall-cmd -V
0.3.8


Help :

Do you know more information about firewall,
 
#  firewall-cmd --help