It’s always DNS… (except when it’s BGP 
! )
If you are using DNS names in clients like Tasmota, there’s an IPv6 trap that newer network kit that resolves AAAA as well as A records…
The test is to use IPv4 addresses directly in Tasmota (note Tasmota doesn’t compile-in mDNS to save space).
If this helps, 
this post!
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