Group Destination Address

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 --> Ethernet MAC of 01:00:5E:0F:0F:0F

For IPv6 Multicast addresses, the Ethernet MAC is derived by the four low-order octets OR'ed with the MAC 33:33:00:00:00:00.

Example: the IPv6 address FF02:DEAD:BEEF::1:3 --> Ethernet MAC of 33:33:00:01:00:03 (RFC 2464).


Famous quotes containing the words address, group and/or destination:

    There’s nothing that makes you so aware of the improvisation of human existence as a song unfinished. Or an old address book.
    Carson McCullers (1917–1967)

    Just as a person who is always asserting that he is too good-natured is the very one from whom to expect, on some occasion, the coldest and most unconcerned cruelty, so when any group sees itself as the bearer of civilization this very belief will betray it into behaving barbarously at the first opportunity.
    Simone Weil (1910–1943)

    Nothing can have as its destination anything other than its origin. The contrary idea, the idea of progress, is poison.
    Simone Weil (1909–1943)