Dan,

I'm not sure what to suggest here. It appears to be something with your network set up, but I can't figure it out.

Are your receivers and linux box on the same subnet (IOW have you divided the 192.168.0.x range in 2 via a subnet mask of 255.255.255.128)? If so, try changing back to multicast and change the multicast-ttl value to 32.

Regards
Paul
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Paul (the tRio guy)