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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Most of the time, the behavior you observe is not the behavior of the nameserver, but of the couple {nameserver, stupid middebox in front of it}. That's why we see strange brokenness while all the nameserver software is free and good.
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Replying to @bortzmeyer @jpmens
How common is it? Do you have any figures? Or do you know of servers serving popular zones exhibiting this behavior?
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Like German Telekom does it with their "you have reached nxdomain, use our browser search" interception?
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I was referring to authoritative servers, not lying resolvers.
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DNS folks are obsessed by latency.
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