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From: Robin Tarsiger <rtt@dasyatidae.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: ai_flags in calls to getaddrinfo
Date: Fri, 1 Jan 2021 06:04:34 -0600	[thread overview]
Message-ID: <270e3e6c-84ed-c512-60bc-992df93b065a@dasyatidae.com> (raw)
In-Reply-To: <05b7ddd3-2a37-8ae6-31b8-07e212538595@dasyatidae.com>

Robin Tarsiger wrote:
> What happens if you pass nil for FAMILY but without the AI_V4MAPPED
> patch, on that system? Have you observed AI_V4MAPPED producing better
> results in any circumstance when you do not set FAMILY to ipv6?
> 
> I conjecture that your upstream resolver is blocking AAAA queries, and
> that AF_UNSPEC is going through a slightly different path, maybe even
> issuing an ANY query which is actually responded to with records from
> both address families, which are then passed through because response
> filtering and query filtering are different. If this is close to true,
> I'm not sure there's a sane way for an application to handle
> inconsistent resolver behavior of that stripe.

Aside:

Inconsistent caching resolver behavior often varies depending on the
state of the cache. So it is useful to try things like this two or
three times in a row in different orders, if you are not sure if
your DNS resolution chain is doing something dubious.

-RTT



  reply	other threads:[~2021-01-01 12:04 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-31 15:06 ai_flags in calls to getaddrinfo Eli Zaretskii
2020-12-31 22:40 ` Robin Tarsiger
2021-01-01  7:43   ` Eli Zaretskii
2021-01-01 11:40     ` Robin Tarsiger
2021-01-01 12:04       ` Robin Tarsiger [this message]
2021-01-01 12:48       ` Eli Zaretskii
2021-01-02  0:19         ` Robin Tarsiger
2021-01-03 16:00   ` Eli Zaretskii
2021-01-11 10:47     ` ai_flags in calls to getaddrinfo, broader call for reproducibility check Robin Tarsiger
2021-01-11 12:42       ` Robert Pluim
2021-01-11 15:25       ` Eli Zaretskii
2021-01-11 15:47         ` Robert Pluim
2021-01-11 16:44           ` Eli Zaretskii
2021-01-11 17:07             ` Robin Tarsiger
2021-01-11 17:53               ` Robert Pluim
2021-01-11 18:30                 ` Robin Tarsiger
2021-01-11 18:42                   ` Robert Pluim
2021-01-11 19:28                     ` Stefan Monnier
2021-01-11 20:12                       ` Robert Pluim
2021-01-11 20:41                         ` Eli Zaretskii
2021-01-11 20:55                           ` Stefan Monnier
2021-01-11 21:02                           ` Robert Pluim
2021-01-11 21:09                             ` Lars Ingebrigtsen
2021-01-11 21:15                               ` Robert Pluim
2021-01-11 22:42                                 ` Lars Ingebrigtsen
2021-01-12  9:40                                   ` Robert Pluim
2021-01-12 12:49                                     ` Lars Ingebrigtsen
2021-01-12 13:04                                       ` Robert Pluim
2021-01-12 14:08                                         ` Lars Ingebrigtsen
2021-01-12 14:29                                           ` Robert Pluim
2021-01-12 18:06                                             ` Lars Ingebrigtsen
2021-01-12 15:14                                       ` Stefan Monnier
2021-01-12 15:45                                         ` Eli Zaretskii
2021-01-12  3:29                             ` Eli Zaretskii
2021-01-11 20:46                 ` Eli Zaretskii
2021-01-11 20:56                   ` Robert Pluim
2021-01-12 15:01                     ` Eli Zaretskii
2021-01-12 15:36                       ` Robert Pluim
2021-01-12 15:42                       ` Eli Zaretskii
2021-01-12 16:00                         ` Robert Pluim
2021-01-12 16:05                           ` Eli Zaretskii
2021-01-12 17:56                             ` Robert Pluim
2021-01-11 19:32           ` Basil L. Contovounesios
2021-01-11 20:19             ` Robert Pluim
2021-01-11 23:57           ` Andy Moreton
2021-01-12  9:44             ` Robert Pluim
2021-01-12 11:56               ` tomas
2021-01-01 10:59 ` ai_flags in calls to getaddrinfo Lars Ingebrigtsen
2021-01-01 12:50   ` Eli Zaretskii
2021-01-02  5:40     ` Lars Ingebrigtsen

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