[CentOS] Centos 6 - disabling IPv6 addressing

Mon Mar 9 05:14:39 UTC 2015
Chris Stone <axisml at gmail.com>

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