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

[Alexander Mayrhofer]

Hello Xavier,

> I work for a Luxembourg company that provide Wifi in the street of
> luxembourg cities (and some other places too).
> 
> I saw that DNS over TLS (not TCP) eg port 853/TCP is more and more used.
> 
> I don't have any graphs about its usage but yes our dnsdist is more and more
> used.

This might very well also be traffic from Android 9, as that has probing of DoT turned on by default. It would be interesting to compare the growth of DNS over TLS with the statistics of Android OS version distribution..

Best,
Alex