Group Destination Address
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Group Destination Address are broadcast address in class D domain. Multicast IP address are Class D IP address, from 224.0.0.0 to 239.255.255.255. They are also referred to as Group Destination Address (GDA). There is a mapping between IP address and MAC address for GDA. GDA MAC address is formed by 01:00:5E:XX:XX:XX, followed by the latest 24 bits of the GDA multicast IP address in hex.
Example: 220.15.15.15 --> 01:00:5E:0F:0F:0F
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