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bret4 said:
Okay, what's multicast traffic?
Basically, multicast traffic is network traffic that is broadcast to all nodes in the subnet (to any network device that is listening). Regular network traffic (typically unicast) is directed to a specific node on the network; but even unicast traffic is visible to all nodes in the subnet, just that all but the target node ignore the traffic.

At least that's the way I remember it from my Computer Science classes in college.
 

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Usually, Broadcast (Multicast) packets are for Address resolution (ARP, RARP). You may want to assign a static IP address to the HR20 and see if it goes away. If they are ARP packets it is trying to resolve and IP/MAC address on the network.
 

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wlgott said:
Does anyone know why the HR20 would be sending out multicast traffic?
Probably some UPnP broadcasts to see what's available. It is also possible that they are working on implementing networking between receivers for any number of applications (like verifying that all the receivers are in the same household).
 
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