[CentOS] Centos 6 - disabling IPv6 addressing

[Joseph L. Brunner]

+1

IPv6 = solution looking for a problem. 

Disabled on all our systems!

-----Original Message-----
From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On Behalf Of Chris Stone
Sent: Monday, March 09, 2015 01:15 AM
To: CentOS mailing list
Subject: Re: [CentOS] Centos 6 - disabling IPv6 addressing

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
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>>
>
>
>
> --
> Chris Stone
> AxisInternet, Inc.
> www.axint.net
>



--
Chris Stone
AxisInternet, Inc.
www.axint.net
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