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STUN Binding Request toward pi-hole.


My primary local DNS is (pi-hole) and secondary router's interface (

I was investigating some Whatsapp call issues on my wife's iPhone and noticed something weird in tcpdump (was taken on AP). Please see below:

It looks like the iPhone quite frequently sends STUN Binding Request towards pi-hone. Is it expected?

Just want to know if it's normal even if nothing to do with the actual issue.

Thanks, Myky