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Barr4476
Inspiring
November 9, 2010
Answered

FMIS 4 IP Multicast solution

  • November 9, 2010
  • 1 reply
  • 1203 views

I was wondering if any one could clarify something with IP multicast. From what I understand to get IP multicast to work the server needs to publish to the router box. So how can this be achieved if the FMS server is not in the same network as the router box? Would it require a second FMS server to be placed in the same network as the router box that connects to the main FMS server?

I would highly appreciate any help.

    This topic has been closed for replies.
    Correct answer Michael Thornburgh

    Is it correct to assume then that it is not possible for the FMS to send a multicast stream to a multicast enabled router in a different external network?

    Thank you for the help, for a while I thought no one knew the answer.


    correct.  that's not how IP multicast works.  FMS doesn't directly support any multicast tunnel schemes.  FMS can send datagrams directly to IP multicast addresses; multicast routers are responsible for propagating those datagrams to other networks.

    1 reply

    M
    Adobe Employee
    Michael Thornburgh
    Adobe Employee
    November 15, 2010

    when FMS publishes an IP multicast, it is simply sending UDP datagrams to the specified IP multicast address (for example, 239.235.1.2:30000 or [ff05::ffff]:30000).  your network and routers must be configured to accept and forward these IP multicast packets in order for the stream to propagate beyond the LAN to which FMS is connected.

    B
    Barr4476Author
    Inspiring
    November 15, 2010

    So, does the IP multicast address targeted need to be on the same network as the FMS?

    M
    Adobe Employee
    Michael Thornburgh
    Adobe Employee
    November 15, 2010

    IP multicast addresses are special-purpose addresses that can be used on all networks.  multicast addresses are those in 224.0.0.0/4 (224.0.0.0 -> 239.255.255.255) and ff00::/8 (ff00:0:0:0:0:0:0:0 -> ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff).  multicast is a way of addressing multiple interfaces simultaneously.  multiple listeners can subscribe to a multicast address to receive the datagrams sent to it.

    IP multicast works directly and automatically on a LAN.  for multicast packets to propagate between LANs, the network routers must be configured to enable IP multicast routing.  depending on the administrative policies in place in your network, only certain sources may be allowed to send multicast datagrams beyond the LAN.

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