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

[Xavier Beaudouin]

Hello,


>> 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..

Well maybe, but unfortunatly I have no idea how to check the Android version 
users have (well not directly)....

I'll ask people there... if there is somewhat statistics on the captive portals.

Xavier