Disabling DHCPv6 requests

[Karl Auer]

On Mon, 2016-09-12 at 15:35 -0300, Duane Whitty wrote:
> I would like to know if there is a method to tell dhclient to send an
> option in advance to the ipv6 capable router notifying it that this
> client isn't doing ipv6 or a response back when it makes the request
> to start ipv6 configuration

All that is happening is that the router is advising your subnet (and
thus your computer) that it has DHCPv6 available and the client should
use it *if it wants to do IPv6*. However, your computer does not have
to do DHCPv6,; it doesn't even have to do IPv6 at all.

So if it is your router, just remove IPv6 and any DCPv6 server from the
router interface serving your link.

But I'm puzzled as to why, if you have really disabled IPv6, you saw
any DHCPv6 information at all. You can check if you have really
disabled IPv6 by running ifconfig - if you see an address "::1" on the
lo interface, then you still have IPv6 enabled.

To disable it properly, set disable_ipv6 in /proc to 1:

   sysctl -w net.ipv6.conf.all.disable_ipv6=1

Make it permanent by editing /etc/sysctl.conf if you wish.

Regards, K.

PS: I do not recommend disabling IPv6.

-- 
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Karl Auer (kauer at biplane.com.au)
http://www.biplane.com.au/kauer
http://twitter.com/kauer389

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