[dns-operations] DNS over TCP query uptick with iOS 13?

David opendak at shaw.ca
Fri Oct 4 17:26:06 UTC 2019

On 2019-10-04 11:19 a.m., Greg Choules wrote:
>  From a mobile operator in the UK, we saw an increase in TCP queries
> starting on 20 Sept and ramping up. The current level (though not huge) is
> almost double what it was before iOS 13 came out.

Thanks Greg. In terms of active connections we might be about the same, 
but they seem to cycle open connections quite quickly. In terms of query 
rates we are at about 4 times the normal rate here (for ones over TCP).


> cheers, Greg
> On Fri, 4 Oct 2019 at 15:25, David <opendak at shaw.ca> wrote:
>> Hello,
>> We have recently observed an uptick in clients doing DNS queries over
>> TCP that started around the release date of iOS 13 and has grown since
>> then. Most of the qnames seem to be Apple related which points in that
>> direction.
>> Has anyone else seen the same in their environment?
>> Thanks,
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