Bug#1017899: apt - Considers hard DNS errors as transient, prolongs fallback

[Bastian Blank <waldi@debian.org>]

Hi

On Mon, Aug 22, 2022 at 10:02:38AM +0200, Julian Andres Klode wrote:
> > apt considers all hard DNS errors (NXDOMAIN), aka
> > EAI_NONAME from getaddrinfo, as transient and retries.
> 
> I'm pretty sure this is the right behavior, there certainly
> are very strange captive portals in the wild that will return
> wrong DNS results to unauthorized clients; and that's what the
> transient error feature is for.

Hu?  Could you provide an example?  Captive portals want users to find
it, so NXDOMAIN is quite unproductive.

I would especially like to know that it clears up without intervention
within the retry time.

Because NXDOMAIN is a hard authoritative error.

Bastian

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