Re: Disabling IPv6 by default when creating a new namespace in Linux

--0000000000008eaf6e05e0e09271
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Thanks Bj=C3=B8rn for the reply. But with the grub command line, IPv6 optio=
n is
not available i.e.* net.ipv6.conf.all.disable_ipv6* i.e. net.ipv6 itself is
not available.

$ sudo sysctl net.ipv6
sysctl: cannot stat /proc/sys/net/ipv6: No such file or directory

I want to enable and disable IPv6 when the Linux box is up and running.

Sysctls worked but not for new namespaces. Is this a limitation of Linux?

BTW, the value is still 0 for disable_ipv6

$ cat /sys/module/ipv6/parameters/disable_ipv6
0

Dheeraj

On Tue, Jun 7, 2022 at 2:38 PM Bj=C3=B8rn Mork <[email protected]> wrote:

> Dheeraj Kandula <[email protected]> writes:
>
> > Thanks Bj=C3=B8rn for your response. I think I am getting a bit confuse=
d here.
> >
> > I booted up my Linux VM and set the following in my /etc/sysctl.conf
> file:
>
>
> You need to make the change in your boot loader.  grub or whatever.
> That's where the kernel command line is set.
>
> E.g edit /etc/default/grub and add ipv6.disable_ipv6=3D1 to the
> GRUB_CMDLINE_LINUX variable, and then run update-grub to produce a new
> /boot/grub/grub.cfg configuration file.
>
>
>
>
> Bj=C3=B8rn
>

--0000000000008eaf6e05e0e09271
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Thanks Bj=C3=B8rn for the reply. But with the grub co=
mmand line, IPv6 option is not available i.e.<b> net.ipv6.conf.all.disable_=
ipv6</b> i.e. net.ipv6 itself is not available. <br></div><div><br></div><d=
iv>$ sudo sysctl net.ipv6<br>sysctl: cannot stat /proc/sys/net/ipv6: No suc=
h file or directory<br></div><div><br></div><div>I want to enable and disab=
le IPv6 when the Linux box is up and running. <br></div><div><br></div><div=
>Sysctls worked but not for new namespaces. Is this a limitation of Linux?<=
/div><div><br></div><div>BTW, the value is still 0 for disable_ipv6<br></di=
v><div><br></div><div>$ cat /sys/module/ipv6/parameters/disable_ipv6<br>0<b=
r></div><div><br></div><div>Dheeraj<br></div></div><br><div class=3D"gmail_=
quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jun 7, 2022 at 2:38 PM=
 Bj=C3=B8rn Mork &lt;<a href=3D"mailto:[email protected]">[email protected]</a>&gt;=
 wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px =
0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dheeraj =
Kandula &lt;<a href=3D"mailto:[email protected]" target=3D"_blank">dkandul=
[email protected]</a>&gt; writes:<br>
<br>
&gt; Thanks Bj=C3=B8rn for your response. I think I am getting a bit confus=
ed here.<br>
&gt;<br>
&gt; I booted up my Linux VM and set the following in my /etc/sysctl.conf f=
ile:<br>
<br>
<br>
You need to make the change in your boot loader.=C2=A0 grub or whatever.<br=
>
That&#39;s where the kernel command line is set.<br>
<br>
E.g edit /etc/default/grub and add ipv6.disable_ipv6=3D1 to the<br>
GRUB_CMDLINE_LINUX variable, and then run update-grub to produce a new<br>
/boot/grub/grub.cfg configuration file.<br>
<br>
<br>
<br>
<br>
Bj=C3=B8rn<br>
</blockquote></div>

--0000000000008eaf6e05e0e09271--