Re: [v6ops] IPv4 trajectory

[Alexandru Petrescu <[e-mail]>]

Le 02/04/2015 13:04, Bjoern A. Zeeb a écrit :
>
>> On 02 Apr 2015, at 06:36 , Alexandru Petrescu
>> <[e-mail]> wrote:
>>
>> Sorry to insist on this, just as side note.
>>
>> Le 01/04/2015 19:54, Bjoern A. Zeeb a écrit :
>>>> On 01 Apr 2015, at 14:07 , Alexandru Petrescu
>>>> <[e-mail]> wrote:
>>>>
>>>> It is customary to see current computers having both an IPv6
>>>> stack and an IPv4 stack on them.  But some computers only have
>>>> IPv4, whereas the rest have IPv4 and IPv6 stacks.  There are no
>>>> computers (to my knowledge) which have only IPv6 stacks.
>>>
>>> One of my desktop systems does (not have IPv4 support anymore;
>>
>> In general I can agree with you, in a sense where maybe a computer
>> is not reachable on IPv4 from another computer; maybe part of IPv4
>> support is no more there.
>
> On FreeBSD I compile it out of my kernel and parts of user space if
> I want to.  We did this for World IPv6 Day almost 4 years ago:
> http://www.prweb.com/releases/2011/6/prweb8529718.htm
>
> If you used FreeBSD jails for services you could run them IPv6-only
> since FreeBSD 7.2 and you do get “Address Family Not Supported” back
> for every IPv4 operation you try to do (7.2 was released in May
> 2009).  Gosh, been doing this for more than 5 years already.

That's good for BSD then, I am happy for it.  Does it remove the
127.0.0.1 from its /etc/hosts too?

In linux you can't make the IPv4 stack or any of its features into a
module.  It's builtin.

>>> and to my knowledge you can just disable it on Windows as well,
>>
>> Right - uncheck the IPv4 box, and check IPv6 on a computer Windows
>> 7's “Properties" of the network interface - it works.
>
> Wrong:
>
> netsh interface ipv4 uninstall and reboot

I'd like to try that.  But if it fails can I 'install' it back somehow?

(because I already experienced some hangs with checking off IPv4 while
wireshark running - for some reasons some apps think that if IPv4 is not
there then networking is not there although they are IPv6-capable).

> and you’ll not see IPv4 anymore in route print or ipconfig /all and
> ping 127.1 will no longer work but error on you.

And Windows' hosts file containing 127?

>>> so it’s not a big deal anymore).
>>
>> I beg to differ, as I see it this is still far away from an ideal
>> where only IPv6 were present in the computer.
>
>
> Well, better start living it today and we can have a lot better
> operational discussions on the end-node (client/server systems)
> side. I have 7 IPv4 addresses left in use in total for all my
> infrastructure (and could condense it to 2 or 3 if I wanted really
> badly).  And the only reason I keep those is for the ipv4-only world
> to reach NS/MX/Web.  But that’s just me.  Leave a /27 for a SMB and
> be good ;-)

Congratulations.

I have no BSD here, except for the proprietary derivatives (ios,
windows, etc).  For all code that I can modify it's linux.  Given that I
can't turn off IPv4 until linux gives a means to.

Do you know whether ios has such a means to turn off fully IPv4?

Alex

>
> — Bjoern A. Zeeb                                  Charles Haddon
> Spurgeon: "Friendship is one of the sweetest joys of life.  Many
> might have failed beneath the bitterness of their trial  had they
> not found a friend."
>
>
>