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Reasoning: - Makes code in single-netif case perform better and smaller - IGMP / MLD6 code is a little bit easier to read and understand - Easier to get multicast groups per netif when implementing drivers Downside: In multi-netif mode, there are two more pointers on each netif, even if IGMP/MLD6 is not used on it. But these systems should not be so memory-constrained that this will matter.