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Re: [v6ops] rfc8305 and apple iOS

Ted Lemon <mellon@fugue.com> Sat, 27 February 2021 18:00 UTC

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From: Ted Lemon <mellon@fugue.com>
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Date: Sat, 27 Feb 2021 13:00:16 -0500
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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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Okay, that’s the information I was looking for. I don’t know the answer. My point was that how a particular application behaves isn’t really embedded in the operating system. It would be interesting to see if the different APIs all behave the same. 

> On Feb 27, 2021, at 12:42, Yannis Nikolopoulos <yanodd@otenet.gr> wrote:
> 
>  Hi,
> 
> I'm not sure, but the setup is an iphone 11 connected (via USB) to a macbook laptop, where tcpdump traces are taken from the iphone's 4g radio (attached to the laptop as a remote virtual interface). So, the client is Safari 14 and I'm guessing the web api is used
> 
>> On 27/2/21 7:23 PM, Ted Lemon wrote:
>> 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
>>> _______________________________________________
>>> v6ops mailing list
>>> v6ops@ietf.org
>>> https://www.ietf.org/mailman/listinfo/v6ops
>

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