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IP Multicast Group Addresses
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224.0.0.0–239.255.255.255
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Class “D” Address Space
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High order bits of 1st Octet = “1110”
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TTL
value defines scope and limits distribution
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IP
multicast packet must have TTL > interface TTL or it is discarded
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values
are: 0=host, 1=network, 32=same site, 64=same region,
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128=same
continent, 255=unrestricted
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No
longer recommended as a reliable scoping mechanism
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