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Re: [v6ops] rfc8305 and apple iOS

Ted Lemon <mellon@fugue.com> Sat, 27 February 2021 17:23 UTC

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From: Ted Lemon <mellon@fugue.com>
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Date: Sat, 27 Feb 2021 12:23:13 -0500
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References: <0e9fb3ab-a32b-5d60-1cec-121f9b20b934@otenet.gr>
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To: Yannis Nikolopoulos <yanodd@otenet.gr>
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Subject: Re: [v6ops] rfc8305 and apple iOS
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Do you know which api the client uses?

> On Feb 27, 2021, at 12:17, Yannis Nikolopoulos <yanodd@otenet.gr> wrote:
> 
>  Hello,
> 
> It's been a while, but I was under the impression that Apple's iOS honors rfc8305, section 3:
> 
> "When a client has both IPv4 and IPv6 connectivity and is trying to
>    establish a connection with a named host, it needs to send out both
>    AAAA and A DNS queries.  Both queries SHOULD be made as soon after
>    one another as possible, with the AAAA query made first and
>    immediately followed by the A query.
> 
>    Implementations SHOULD NOT wait for both families of answers to
>    return before attempting connection establishment"
> 
> I was running some tests on an iphone 11 w/ safari and realized that the client waits for both DNS replies before sending the 
> first SYN packet (got several captures). Has anybody got any insights on this?
> 
> Yannis
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