How common is it for authoritative DNS servers to not respond to queries for zones they are not authoritative for (instead of returning REFUSED)?
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When Route 53 launched, we blackholed queries like this and didn't respond. The reason was intentional: if there were ever a disastrous misconfiguration that meant the servers were "missing" zones that they should have, we wanted to avoid poisoning resolvers.
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Interesting! Thanks a lot, Colm!
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