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Forum Replies

  1. Hello Rene,
    A few questions and confusions.

    1. When a multicast address is being used as a group address(for example, this address is assigned to the multicast server and this address has to have route in the network design because whenever a host will encapsulate an IP packet, it will use its own address as the source and address as the destination address. Is this correct?
    2. Would you also please give me a real life scenarion where multicast is used?
    3. In your IGMP version 3 example, is being used as the source address. What is this add
    ... Continue reading in our forum

  2. Hello Azm

    Well, not quite. The multicast address is not assigned to the multicast server,

    ... Continue reading in our forum

  3. Hi Azm,

    Multicast isn’t really used on the Internet. It would make a lot of sense to use multicast for online radio but in reality, it’s unicasted everywhere. There is no “global” multicast network that spans multiple ISPs. One application that was common back in the days on the LAN was Norton Ghost to send a system image to all computers. Without multicast, you had to unicast huge images to all computers which wasn’t very efficient.

    When your computer wants to receive a multicast stream, it uses IGMP to “report” which multicast group it wants to receive. IGMP

    ... Continue reading in our forum

  4. Hi Rene,

    What is the purpose of sending two membership report from H1, one determines there is a new address and the other determines the mode, I mean why not be in one membership report ???

  5. Hi Hussein,

    To be honest, I have no idea…I guess this is one of those “that’s how they designed it” answers. They probably could have been combined in a single packet but for some reason, they decided to go for two packets.

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