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Re: ai_flags in calls to getaddrinfo, broader call for reproducibility c


From: Robert Pluim
Subject: Re: ai_flags in calls to getaddrinfo, broader call for reproducibility check
Date: Mon, 11 Jan 2021 13:42:58 +0100

Robin Tarsiger <rtt@dasyatidae.com> writes:

> In the meantime, if others on the list would be willing to test these
> on Windows and/or with unusual resolver configurations, especially
> if you can get or point to a packet dump of how a Windows system
> converts different getaddrinfo parameters to DNS requests on the
> wire (and the responses, if comfortable with that), that would also
> be useful. In particular, if this turns out to be specific to
> Windows but not specific to that one host's network, then it may
> make sense to set some flags conditioned on OS. I am also curious
> whether AI_ALL _without_ AI_V4MAPPED does anything on Windows, per
> what I mentioned upthread.
>

Iʼve only been tangentially following this discussion, but my first
reaction is that V4 mapped V6 addresses are best avoided. Either go
for proper IPv6 connectivity or avoid IPv6 entirely..

> -RTT "Why is wanting things to be correct so messy sometimes"

Such is life (and not just with technology).

Robert



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