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[ NNSquad ] The Once and Future King: Multicast looks to (finally) be the future of television.

this article from cringley may explain some isps behavior:



See, multicast IS a resource hog.

But to more and more ISPs multicast is looking like the best answer to a
huge bandwidth problem, while also being a sneaky way to take back control
of the Internet.

The first problem ISPs are facing is that they are running out of IP
addresses. Many, including Comcast (my ISP), are already reusing IP
addresses on subnets and are rapidly moving toward IPv6. The second
problem these ISPs are facing is they are running out of bandwidth at
layers 1 and 2 of the OSI protocol stack. We're not talking so much about
Internet bandwidth here but Intranet bandwidth -- bandwidth within the
ISP's own cable plant -- and this loss they blame primarily on P2P
file-sharing services.

In order to lower their bandwidth bills, ISPs are trying to take greater
control of the way we, their customers, use our "unlimited" bandwidth. So
Verizon and a lot of other DSL and wireless data providers are placing
download caps on their monthly service while Comcast has been traffic
shaping to limit the growth of P2P file-sharing services like BitTorrent.
This is all intended less to slap us around and more to keep ISP costs in
line so they can -- big secret coming -- CONTINUE TO MAKE NEARLY ALL THEIR
PROFIT FROM PROVIDING INTERNET SERVICE. You think your phone company makes
a lot of profit on voice and long distance or that your cable company
makes a lot on carrying video channels? Think again. Comcast barely breaks
even on video and makes a killing on Internet and VoIP. If cable company
Internet subscriptions fall, those companies are in real trouble.

Why, then, would they risk alienating us, their customers? Because they
think we are stupid, for one. And because they intend to offer us
alternatives, like IP Multicast.

Both Comcast and Verizon are rapidly rolling out IP multicast, as I am
sure most big cable and telephone ISPs are. Even Verizon's
fiber-to-the-home service, FiOS, is moving to multicast because it was
architected in a dumb way that sorely limits what should be a lot of