Thanks for your response, but I don't think this fixes the problem. Why bother setting the Sending- and ReceivingInterfaceAddr at all if you are going to get the address using multicast loopback first? When I try this in my system with multicast enabled on eth1 and eth0, the multicast loopback selects eth0 as the interface and eth1 is not able to receive multicast data. The work around I was using previously was to remove the multicast route from eth0, but in my target, all NICs will have multicast enabled.
Ross, David: Please solve this problem in the following way: GroupsockHelper.cpp line 105 (hopefully) - Function: setupDatagramSocket() - MAKE_SOCKADDR_IN(name, ReceivingInterfaceAddr, port.num()); + MAKE_SOCKADDR_IN(name, 0, port.num()); The call to bind() allows all datagrams sent to the port number to be received when the address = INADDR_ANY, as described here: http://docs.hp.com/en/B9106-90013/IP.7P.html Binding to the ReceivingInterfaceAddr will allow unicast data to be received on that port, but not multicast. Thanks! Xochitl
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