Steps to enable and disable firewall in CentOS 6

You have to be the root to run the following commands.

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Enable Firewall for IPv4:

# service iptables start
# chkconfig iptables on

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Disable Firewall for IPv4:

# service iptables save
# service iptables stop
# chkconfig iptables off

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Enable Firewall for IPv6:

# service ip6tables start
# chkconfig ip6tables on

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Disable Firewall for IPv6:

# service ip6tables save
# service ip6tables stop
# chkconfig ip6tables off

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