Disabling firewall in CENT OS

Task: Disable firewall

Type the following command as the root user to disable firewall for IPv4:
# service iptables save
# service iptables stop
# chkconfig iptables off

Sample output with verification (see below):

Red Enterprise Linux Disable Iptables IPv4 Firewall

Type the following command as the root user to disable firewall for IPv6 :
# service ip6tables save
# service ip6tables stop
# chkconfig ip6tables off

Task: Enable firewall

Type the following command as the root user to enable firewall for IPv4:
# service iptables start
# chkconfig iptables on
Sample outputs:

iptables: Applying firewall rules:                         [  OK  ]

Type the following command as the root user to disable firewall for IPv6 :
# service ip6tables start
# chkconfig ip6tables on

Task: Verify that firewall is disabled

Type the following command as root user to see IPv4 firewall rules:
# /sbin/iptables -L -v -nOR
# service iptables status

Type the following command as root user to see IPv6 firewall rules:
# /sbin/ip6tables -L -v -n
OR
# service ip6tables status

 

Source:

http://www.cyberciti.biz/faq/fedora-redhat-centos-5-6-disable-firewall/