====== Disable ======
===== Kernel =====
<code bash> sysctl -w net.ipv6.conf.all.disable_ipv6=1 && sysctl -w net.ipv6.conf.default.disable_ipv6=1 && sysctl -w net.ipv6.conf.lo.disable_ipv6=1</code>

===== Raspberry Pi =====
https://cwesystems.com/?p=231
<code bash> vi /etc/sysctl.conf</code>
<code perl>net.ipv6.conf.all.disable_ipv6=1
net.ipv6.conf.default.disable_ipv6=1
net.ipv6.conf.lo.disable_ipv6=1
net.ipv6.conf.eth0.disable_ipv6 = 1</code>
<code bash> vi /etc/rc.local</code>
:!: __**Before**__ exit 0
<code perl>service procps reload</code>
Reboot