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Source-specific multicast

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Source specific multicast is a method of delivering multicast packets originating in only a specific source address S to any receiver that requests it. It limits the original multicast model to be originated in just one source, simplifiying the requirements on the network and easing security of multicast delivery.

It requires that the receivers specify the source address, something that is only possible in IGMPv3 and IPv6's MLD.

Destination addresses must be in the ranges 232/8 and FF3x::/96

Source specific multicast is described in informational RFC 3569

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