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How to disable IPv6 in CentOS 6

Disabling IPv6 may be necessary if you run network services that use IPv6 but have no functional IPv6 networking. For example, using Exim, Postfix or even PHP-FPM may switch to IPv6.

Edit /etc/sysconfig/network

Change the following:

NETWORKING_IPV6=yes to
NETWORKING_IPV6=no

Edit /etc/modprobe.conf

Add the following if it does not exist:

alias net-pf-10 off
alias ipv6 off

Stop the ipv6tables service

service ip6tables stop

Disable the ipv6tables service

chkconfig ip6tables off

After these changes, IPv6 will be disabled after the next reboot of your system.

Updated on March 25, 2017

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