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Multicast is (almost) as old as the Internet, having become a tool forincreasing network efficiency but also enabling destination discovery in anumber of key use cases, although misaligned economic interests have limitedits deployment to domain-local usages. But recent advances in multicasttechnologies as well as the identification of new use cases for which IPmulticast may be ill fitted yet network-level support may be desirable motivateto re-think old perceptions of multicast and its use in the Internet overall.For this, we return to the original question to which multicast is seeminglythe right answer, based on which we outline emerging new answers to whatmulticast intends to achieve. Key to this is to re-formulate the multicastquestion in an attempt to semantically and architecturally align differentanswers, opening opportunities for more use cases to be served throughmulticast solutions, thus also driving the need for more research in thisspace. Our paper poses this new vision for multicast and investigates thealignment of existing and emerging multicast solutions with it, leading us toformulate a path for future research.

If Multicast is the Answer -- What was the Question?