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From: Marc Haber <mh+usenetspam1118@zugschl.us>
Newsgroups: comp.os.linux.misc
Subject: Re: Anybody Using IPv6?
Date: Wed, 21 May 2025 21:14:30 +0200
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The Natural Philosopher <tnp@invalid.invalid> wrote:
>On 21/05/2025 15:52, Marc Haber wrote:
>> "Carlos E. R." <robin_listas@es.invalid> wrote:
>>> On 2025-05-21 13:16, Marc Haber wrote:
>>>> I think that the local resolver should² also refrain from asking for
>>>> AAAA records if the local system doesn't have IPv6, but I don't know
>>>> whether this special-case handling is implemented at all. And I'm too
>>>> lazy to look that up.
>>>>
>>>> But all this needs to be taken into account before someone can comment
>>>> about speed of one IP protocol compared to the other on a level that
>>>> is beyond passing myths.
>>>
>>> It just is a perceived fact. On some machines, if an application gets
>>> back from the system a list of addresses to try, and tries IPv6 first
>>> when there is no actual IPv6 internet connectivity, there is a small
>>> delay waiting for the request to fail, and then try the next address in
>>> the list.
>> 
>> pcap/strace or it didn't happen.
>> 
>> Please note that _broken_ IPv6, for example when the router announces
>> an IPv6 but the network doesn't return a host unreachable ICMPv6
>> message from the place where connectivity is missing, will cause an
>> IPv6-enabled application to wait for the time out. But that is an
>> error in the _network_ setup, and should not happen in the case where
>> the end system (the one with the application running) has v6 enabled
>> on a non-v6-enabled network.
>> 
>Sure. Its always *somebody elses* problem.

YOUR network is YOUR problem.

-- 
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