Re: Linux advocacy

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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