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NXDOMAIN caching has been the bane of my existence recently and I have been meaning to survey how other cache implementations deal with the problem. Looks like everyone suffers from it. I've heard edgy teenagers say that existence is suffering, but I suppose caches teach us that non-existence is suffering too.

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NXDOMAIN at least has a TTL so it will not grow forever. What problem are you referring to, not being able to invalidate a cached NXDOMAIN? Or something else?

Yeah, well, if the TTL in the SOA were being respected it wouldn't be a problem. Tomorrow we're going to run some experiments to find out which godforsaken layer of "smart" infrastructure is responsible.

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