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RFC3376
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Enables
hosts to listen only to a specified subset of the
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hosts
sending to the group
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Source = 1.1.1.1
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Group =
224.1.1.1
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Source = 2.2.2.2
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Group =
224.1.1.1
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H1 wants to receive from S
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= 1.1.1.1 but not from S =
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2.2.2.2
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With IGMPv3, specific
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sources can be pruned back
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- S = 2.2.2.2 in this case
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