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From: Marc Haber <mh+usenetspam1118@zugschl.us>
Newsgroups: comp.os.linux.misc
Subject: Re: Linux advocacy
Date: Tue, 20 May 2025 12:20:47 +0200
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Nuno Silva <nunojsilva@invalid.invalid> wrote:
>On 2025-05-20, 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.
>
>Maybe what's missing here for some of the affected people is configuring
>address lookup to prefer IPv4 if they're using nameservers that return
>AAAA records?

An IPv4 only host will just ignore any AAAA records sent to them. Even
if IPv6 is enabled but not available, the host will either immediately
see that it doesn't have working IPv6, or it will go through the
motions of inspecting the IPv6 routing table, finding that there is no
default route and immediately jump back to the application.

>(Just a wild guess, but fitting enough that it's probably a good idea to
>drop this here:)
>
>    news://news.gmane.io/m3msju6x5x.fsf@lugabout.jhcloos.org
>
>Although I'm not sure, from the gai.conf online manual page, that just
>the mentioned line is sufficient, given it's said to disable the
>"default table". I didn't test this myself.

I would advise against doing this.

Greetings
Marc
-- 
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Marc Haber         |   " Questions are the         | Mailadresse im Header
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