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Re: [v6ops] rfc8305 and apple iOS

Yannis Nikolopoulos <yanodd@otenet.gr> Sat, 27 February 2021 17:42 UTC

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To: Ted Lemon <mellon@fugue.com>
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From: Yannis Nikolopoulos <yanodd@otenet.gr>
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Date: Sat, 27 Feb 2021 19:42:21 +0200
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Subject: Re: [v6ops] rfc8305 and apple iOS
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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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