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

sudo service iptables status
sudo service ip6tables status
sudo iptables -L -v -n
sudo ip6tables -L -v -n

sudo service iptables save
sudo service iptables stop
sudo chkconfig iptables off

sudo service ip6tables save
sudo service ip6tables stop
sudo chkconfig ip6tables off