===== Disable IPv6 =====

==== RHEL ====


Without restart:

<code>
echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6
echo 1 > /proc/sys/net/ipv6/conf/default/disable_ipv6
</code>

Permanent changes:
Edit /etc/modprobe.d/ipv6.conf:

<code>
options ipv6 disable=1
</code>

Edit /etc/sysctl.conf:
<code>
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
</code>

Finally:
<code>
cp -p /etc/hosts /etc/hosts.disableipv6
sed -i 's/^[[:space:]]*::/#::/' /etc/hosts
</code>

==== References ====
  * http://beforeitsnews.com/opinion-liberal/2012/08/how-to-disable-ipv6-on-rhel-centos-2445758.html
  * https://access.redhat.com/solutions/8709