On Thursday, 25 August 2022 at 11:36:59 UTC+1 [email protected] wrote:

> 1) [image: 2022-08-25_20-10-14.png]
>
> 2) I was checking with tcpdump. Don't know if I'm on pair with your theory 
> cause client (blackbox) sending syn immediately after receiving "large" udp 
> packet.
>

Does tcpdump decode this "large" udp response?  Is it a valid DNS packet?

If the resolver switches to TCP immediately - which it is entitled to - 
this then begs the question of where the 3 second delay is coming from.  
Again, more tcpdump analysis may be required.

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