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

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Thanks a lot Bjorn for pointing this out. I now have IPv6 disabled by
default in newly created namespaces too.

However, when I enable IPv6 globally it is not enabled inside the already
created namespaces. Maybe it has to be done explicitly. I will see if this
behavior is acceptable.

Thanks a lot Bjorn. I really appreciate your time and patience.

Thanks, Marc too for taking the time to respond to my emails.

Dheeraj

On Tue, Jun 7, 2022 at 4:05 PM Bj=C3=B8rn Mork <[email protected]> wrote:

> Dheeraj Kandula <[email protected]> writes:
>
> > Thanks Bj=C3=B8rn for the reply. But with the grub command line, IPv6 o=
ption
> is
> > not available i.e.* net.ipv6.conf.all.disable_ipv6* i.e. net.ipv6 itsel=
f
> is
> > not available.
> >
> > $ sudo sysctl net.ipv6
> > sysctl: cannot stat /proc/sys/net/ipv6: No such file or directory
>
> Huh?  Did you set ipv6.disable instead og ipv6.disable_ipv6?  Those are
> very different, as documented in the module:
>
>
> bjorn@miraculix:~$ modinfo ipv6
> name:           ipv6
> filename:       (builtin)
> alias:          net-pf-10
> license:        GPL
> file:           net/ipv6/ipv6
> description:    IPv6 protocol stack for Linux
> author:         Cast of dozens
> parm:           disable:Disable IPv6 module such that it is non-functiona=
l
> (int)
> parm:           disable_ipv6:Disable IPv6 on all interfaces (int)
> parm:           autoconf:Enable IPv6 address autoconfiguration on all
> interfaces (int)
>
>
>
>
> Bj=C3=B8rn
>

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<div dir=3D"ltr"><div>Thanks a lot Bjorn for pointing this out. I now have =
IPv6 disabled by default in newly created namespaces too.<br></div><div><br=
></div><div>However, when I enable IPv6 globally it is not enabled inside t=
he already created namespaces. Maybe it has to be done explicitly. I will s=
ee if this behavior is acceptable. <br></div><div><br></div><div>Thanks a l=
ot Bjorn. I really appreciate your time and patience. <br></div><div><br></=
div><div>Thanks, Marc too for taking the time to respond to my emails.<br><=
/div><div><br></div><div>Dheeraj<br></div></div><br><div class=3D"gmail_quo=
te"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jun 7, 2022 at 4:05 PM Bj=
=C3=B8rn Mork &lt;<a href=3D"mailto:[email protected]">[email protected]</a>&gt; wr=
ote:<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 Kan=
dula &lt;<a href=3D"mailto:[email protected]" target=3D"_blank">dkandula@g=
mail.com</a>&gt; writes:<br>
<br>
&gt; Thanks Bj=C3=B8rn for the reply. But with the grub command line, IPv6 =
option is<br>
&gt; not available i.e.* net.ipv6.conf.all.disable_ipv6* i.e. net.ipv6 itse=
lf is<br>
&gt; not available.<br>
&gt;<br>
&gt; $ sudo sysctl net.ipv6<br>
&gt; sysctl: cannot stat /proc/sys/net/ipv6: No such file or directory<br>
<br>
Huh?=C2=A0 Did you set ipv6.disable instead og ipv6.disable_ipv6?=C2=A0 Tho=
se are<br>
very different, as documented in the module:<br>
<br>
<br>
bjorn@miraculix:~$ modinfo ipv6<br>
name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ipv6<br>
filename:=C2=A0 =C2=A0 =C2=A0 =C2=A0(builtin)<br>
alias:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 net-pf-10<br>
license:=C2=A0 =C2=A0 =C2=A0 =C2=A0 GPL<br>
file:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0net/ipv6/ipv6<br>
description:=C2=A0 =C2=A0 IPv6 protocol stack for Linux<br>
author:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cast of dozens<br>
parm:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0disable:Disable IPv6 module s=
uch that it is non-functional (int)<br>
parm:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0disable_ipv6:Disable IPv6 on =
all interfaces (int)<br>
parm:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0autoconf:Enable IPv6 address =
autoconfiguration on all interfaces (int)<br>
<br>
<br>
<br>
<br>
Bj=C3=B8rn<br>
</blockquote></div>

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