by Picked up this tid-bit on how to disable IPv6 (which aligns with the general sys admin philosophy of “if we are not using it, remove it or turn it off to simplify the system and increase security”:
(1) Edit /etc/sysconfig/network and set NETWORKING_IPV6=no.
(2) Issue the following command as root: ‘chkconfig ip6tables off’.
(3) Reboot the host machine.