Disabling IPv6 support in Red Hat Enterprise Linux 6
Create a file /etc/modprobe.d/ipv6.conf with the following contents:
options ipv6 disable=1
For completeness, it is a good idea to configure the ip6tables service not to start at boot by issuing the following command:
# chkconfig ip6tables off
disable ipv6 support in the kernel through /etc/sysctl.conf :
# ipv6 support in the kernel, set to 0 by default
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
Reboot the system to disable IPv6 support.
Note: There is a special case where this might not work, please see The "ipv6 disable=1" option does not seem to work on Red Hat Enterprise Linux 6 system. Disabling ipv6 in the sysctl.conf will ensure ipv6 isn't used even if the ipv6 module is loaded and can work as a short term solution (until a full reboot).
