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While it is possible to create loops using CNAME records, this is a type of error that can be expected to occur and the spec has been clear all along that the resolver is supposed to detect this and abort. Of course, by the robustness principle, domain software should not fail when presented with CNAME chains or loops; CNAME chains should be followed ...


1

It all depends on the client that you are using. A smart one will detect the loop, while a trivial client may keep doing recursive lookups hitting your computer's DNS cache.



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