====== Disable IPV6 CentOS ======
<color #db5f0b>May 2017</color>
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I find having lots of references to IPV6 addresses a little distracting, especially as at this point in time I am not using them, there is however a really easy way to disable IPV6 in CentOS (and you don't have to remove any IPV6 reference from the ifcfg-xxxx files).
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Edit the <color #ed1c24>/etc/sysctl.conf</color>
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    vi /etc/sysctl.conf
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Enter the following to disbale IPV6 on ALL interfaces:
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    net.ipv6.conf.all.disable_ipv6 = 1
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Alternatively you can disable IPV6 on specific interfaces by using: (assuming en016777736 is the interface name)
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    net.ipv6.conf.eno16777736.disable_ipv6 = 1
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Now enter sysctl -p or reboot, thats it.
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