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)

    Now, honestly: if a large group of ... demonstrators blocked the entrances to St. Patrick’s Cathedral every Sunday for years, making it impossible for worshipers to get inside the church without someone escorting them through screaming crowds, wouldn’t some judge rule that those protesters could keep protesting, but behind police lines and out of the doorways?
    Anna Quindlen (b. 1953)

    A man’s destination is not his destiny,
    Every country is home to one man
    And exile to another. Where a man dies bravely
    At one with his destiny, that soil is his.
    —T.S. (Thomas Stearns)