For the limit on total number of connections: "Absent any other
information,
150 is a reasonable value for this limit in most cases."
[...]
Maybe this could use a clarification that 150 is good advice only if
you _don't_ have any "TCP-only" clients, like e.g. DoT stubs?
I would not be so sure that DoT/DoH are the only cases. What about busy
authoritative servers? You get 150 by default, and then some important
RRset gets over the UDP limit (say, a DNSKEY rollover) and you get into
problems due to overzealous connection limits. IMHO 150 is extremely
cheap for a (potentially) busy server.
--Vladimir | knot-resolver.cz
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