DEL nodes DNS Amplification like behaviour.

My ISP is AS24560 and I am using NextDNS as upstream in AdGuard Home.

I have noticed that when using any of the DEL nodes `anexia-del-1` or `vultr-del-1` with QUIC or with DoH3, after some time the server and local forwarder start exchaning more than 100 packets per second indefinitely with my local forwarder sending no query or very low number of queries.

I have also verified this behaviour when changing the forwarder being used from AdGuard Home to Technitium and noticed the same thing.

Switching to other protcols such as DoH without HTTP3 or switching to other locations such as BLR mitigates the issue.

So somethings is wrong with HTTP3/QUIC implementation on DEL nodes.

https://nextdns.io/diag/04032b00-fa8b-11f0-b955-8db65d1a4e28