Red Enterprise Linux and CentOS Linux version 4 / 5 and 6 disable Iptables IPv4 and IPv6 based firewall commands.
Read answer to: "RHEL / Centos Linux Disable Firewall"
RHEL / Centos Linux Disable Firewall 
Linux Deleting Firewall Rules
How To: Disable Firewall on RHEL / CentOS / RedHat Linux
CentOS / RHEL IPv6 ip6tables Firewall Configuration
Red Hat / CentOS IPv6 Network ConfigurationHowTo: Flush Iptables Under Ubuntu Linux
Slow DNS on Linux with IPv4 and IPV6 Configured Firewall
Disable and Uninstall APF Firewall Script 
IPv6 Address Example
ip6tables: IPv6 Firewall For Linux
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