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I have a windows host machine, sending out multicast and on the same machine I have an oracle virtualbox, running a linux VM with a bridged virtual network card, receiving the multicast.

This setup worked on a couple of different machines, but now I have a machine where it doesn't work... The really strange this is that if I do a tcpdump on the VM, it sees the multicast traffic, but the application doesn't...

I can only think that this is caused by some windows network/configuration setting, because all the other settings are identical to other machines.. Any ideas?

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If it is seeing the traffic in tcpdump on the VM, then it sounds like you need to start troubleshooting there. Have you verified that it's running correctly, and subscribed to the right IGMP group? –  Shane Madden Jan 23 '12 at 16:51
As I wrote, I have identical VMs on other host machines, and there it works fine... since they are identical, they also should behave identical.. unless the outside environment (host configuration) differs. It just doesn't make sense to search for the problem in the VM. –  Karoly Horvath Jan 23 '12 at 20:56

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