Should private DNS mode be on or off?
Private DNS mode should be on, set to a hostname you chose. Here is what the toggle does, when it breaks wifi logins or internal names, and how to tell.
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What is private DNS, and how to run your own
Private DNS is Android's name for DNS over TLS. What it hides from your network, what it does not, and how to run your own resolver on a VPS with Unbound.