What is Allow multicast from Broadband Network?

Posted by PeanutsMonkey on Super User See other posts from Super User or by PeanutsMonkey
Published on 2012-04-12T04:05:39Z Indexed on 2012/04/12 5:34 UTC
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If a wireless modem router has the option Allow multicast from Broadband Network, what does this mean exactly?

What risks are there to leaving it enabled and why would you have it enabled?

I understand that a broadcast is sending a packet to every device on the network and a multicast is send a packet to a specified set of addresses. A multicast packet can cross routers whereas a broadcast cannot although I don't quite understand how these "set of addresses are specified"

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