This definition appears somewhat frequently
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Samples in periodicals archive:
Configures the multicast group address.
4) The “lost” 1st octet makes sense since after applying the OUI in the construction of the MAC address we only have 24bits left, but it’s interesting as the last 4 bits of the OUI map to the first 4 bits of the Multicast IP address.
Join a multicast group and set the IPv4 or IPv6 multicast address.