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From: "Carlos E. R." <robin_listas@es.invalid>
Newsgroups: comp.os.linux.misc
Subject: Re: Anybody Using IPv6?
Date: Tue, 20 May 2025 18:34:51 +0200
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On 2025-05-20 18:02, The Natural Philosopher wrote:
> On 20/05/2025 16:49, Marc Haber wrote:
>> "Carlos E. R." <robin_listas@es.invalid> wrote:
>>> On 2025-05-20 12:21, Marc Haber wrote:
>>>> The Natural Philosopher <tnp@invalid.invalid> wrote:
>>>>> On 20/05/2025 09:00, Marc Haber wrote:
>>>>>> vallor <vallor@cultnix.org> wrote:
>>>>>>> On Sun, 18 May 2025 10:02:22 +0200, Marc Haber
>>>>>>> <mh+usenetspam1118@zugschl.us> wrote in 
>>>>>>> <100c46e$3c1el$1@news1.tnib.de>:
>>>>>>>>>      As for IPV6 ... my ISP doesn't use it. NO use at all - so 
>>>>>>>>> I disable
>>>>>>>>>      it to prevent problems.
>>>>>>>>
>>>>>>>> That's a really stupid idea.
>>>>>>>
>>>>>>> I suggest he enable it from time to time to see if the ISP
>>>>>>> has got it working.
>>>>>>
>>>>>> I suggest not disabling it in in the first place. It doesn't hurt 
>>>>>> when
>>>>>> it's unused and unconfigured.
>>>>>>
>>>>> Oh but it does, when you get ipV6 addresses returned by DNS and you 
>>>>> cant
>>>>> reach them...
>>>>
>>>> And where is the problem with that?
>>>
>>> You don't understand. You want to access gmail, for instance. The
>>> address resolves to some IPv6 and some IPv4 addresses, and your computer
>>> tries to connect on the IPv6 addresses. The application shows an error:
>>> address unreachable.
>>
>> Only that that is not the case.
>>
> Seen it happen.

Me too. I asked for advice, and the solution was to give preference to 
IPv4 over 6.

Possibly there was some bad configuration somewhere, but where? If it 
was out there, it was out of my reach.

It has not happened to me for some years, though. Go figure. Did my 
distro do something? Dunno.


Consider that, for instance, this laptop has an IPv6 address:

cer@Isengard:~> ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
         inet 192.168.1.16  netmask 255.255.0.0  broadcast 192.168.255.255
         inet6 fc00::16  prefixlen 64  scopeid 0x0<global>
         inet6 fe80::4ecc:6aff:fe61:50a1  prefixlen 64  scopeid 0x20<link>
         ether 4c:cc:6a:61:50:a1  txqueuelen 1000  (Ethernet)
...

So applications thought that IPv6 was available.


-- 
Cheers,
        Carlos E.R.