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Played a bit around with this a few years back. Made an endless chain of CNAMEs to see how resolvers would handle it. Turned that nothing (bad) happened as the resolvers gave up after a while

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Wonder what metric(s) make them decide to quit?

Either a hard limit on the number of jumps, or Floyd's Tortoise and Hare Algorithm.

I would have thought there is some form of loop detection, similar how mailservers ckeck for it in email forwarding or autoresponding

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