[CentOS] Centos 6 - disabling IPv6 addressing

[Chris Stone]

How about, in your /etc/sysconfig/network file adding or editing the line
for IPV6 to be:

NETWORKING_IPV6=no

and then try a 'service network restart' and see what you get.


Chris


On Mon, Mar 9, 2015 at 11:52 AM, Robert Moskowitz <rgm at htt-consult.com>
wrote:

> No change after running this and trying both:
>
> system network restart
>
> ifdown eth0; ifup eth0
>
> Still having an IPv6 addr.
>
> The box has been up for 140 days.  Would like to keep it running...
>
> This box is really Redsleeve 6, which is the port of Centos 6 to arm.  The
> kernel I am using is the F19 kernel.  All of this MIGHT be contributing to
> things not working as they would on a 'normal' Centos box.  I am awaiting
> the start of the Centos7-arm work ;)
>
>
> On 03/09/2015 01:15 AM, Chris Stone wrote:
>
>> Sorry - that should be
>>
>>
>> sysctl -w net.ipv6.conf.all.accept_ra=0
>>
>> to disable that, not 1.
>>
>>
>> Chris
>>
>>
>> On Sun, Mar 8, 2015 at 11:14 PM, Chris Stone <axisml at gmail.com> wrote:
>>
>>  Try:
>>>
>>> sysctl -w net.ipv6.conf.all.accept_ra=1
>>>
>>> to persist between boots, be sure to add this to your /etc/sysctl.conf
>>> file.
>>>
>>> This should prevent the box from listening to any RA announcements.
>>>
>>>
>>> Chris
>>>
>>> On Sun, Mar 8, 2015 at 10:55 PM, Ryan Wagoner <rswagoner at gmail.com>
>>> wrote:
>>>
>>>  On Fri, Mar 6, 2015 at 11:52 AM, Robert Moskowitz <rgm at htt-consult.com>
>>>> wrote:
>>>>
>>>>
>>>>> On 03/06/2015 11:00 AM, Robert Moskowitz wrote:
>>>>>
>>>>>
>>>>>> On 03/06/2015 10:55 AM, Barry Brimer wrote:
>>>>>>
>>>>>>
>>>>>>>   IPV6INIT="no"
>>>>>>>
>>>>>>>> But I am still getting a global IPv6 (and of course local scope).
>>>>>>>>
>>>>>>>> What else do I need to do to disable the listening for RA
>>>>>>>>
>>>>>>> announcements
>>>>
>>>>> and setting an IPv6 global address?  I do not want to reboot the box.
>>>>>>>>
>>>>>>>>  There are other modules, most notably bonding that rely on the ipv6
>>>>>>> module being loaded. What I do is place "options ipv6 disable=1" in
>>>>>>> "/etc/modprobe.d/ipv6.conf". That does require a reboot, which I know
>>>>>>>
>>>>>> you
>>>>
>>>>> are looking to avoid, so you may want to try other methods to remove
>>>>>>>
>>>>>> your
>>>>
>>>>> address in the running configuration.
>>>>>>>
>>>>>>>  'All' I need is for the system not to have a global IPv6 address.
>>>>>> Then
>>>>>>
>>>>> it
>>>>
>>>>> will not try to connect to other global IPv6 systems which will reject
>>>>>>
>>>>> the
>>>>
>>>>> connection, as the IPv6 rDNS cannot be set, given it is a dynamic IPv6
>>>>>> assigned address from the ISP.
>>>>>>
>>>>>>  I tried:
>>>>>
>>>>> # cat /etc/sysconfig/network
>>>>> NETWORKING=yes
>>>>> HOSTNAME=z9m9z.htt-consult.com
>>>>> NETWORKING_IPV6=no
>>>>> IPV6INIT=no
>>>>>
>>>>>
>>>>> and 'service network restart' but still showing IPv6 addressing.
>>>>>
>>>>
>>>>
>>>> I would try adding the below line to /etc/sysconfig/network.
>>>>
>>>> IPV6_AUTOCONF=no
>>>>
>>>> Ryan
>>>> _______________________________________________
>>>> CentOS mailing list
>>>> CentOS at centos.org
>>>> http://lists.centos.org/mailman/listinfo/centos
>>>>
>>>>
>>>
>>> --
>>> Chris Stone
>>> AxisInternet, Inc.
>>> www.axint.net
>>>
>>>
>>
>>
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-- 
Chris Stone
AxisInternet, Inc.
www.axint.net