If your policy and network configuration does not require IPv6 support in RHEL / CentOS / Fedora Linux. How do
I prevent the kernel module from loading at boot time and disable IPv6 networking?


You can easily prevent the kernel module from loading by updating the following two files:

/etc/modprobe.conf - Kernel driver configuration file.
/etc/sysconfig/network - RHEL / CentOS networking configuration file.

/etc/modprobe.conf

Edit /etc/modprobe.conf, enter:
# vi /etc/modprobe.conf

Append the following line:

install ipv6 /bin/true
Save and close the file.

/etc/sysconfig/network

Edit /etc/sysconfig/network, enter:
# vi /etc/sysconfig/network

Update / add as follows:


NETWORKING_IPV6=no
IPV6INIT=no

Save and close the file. Restart networking service
# service network restart
# rmmod ipv6

Alternatively, simple reboot the box:
# reboot

Verify IPv6 is disabled, enter:
# lsmod | grep ipv6
# /sbin/ifconfig

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