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
next prev parent 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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