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Re: How do you put a TV station on the Mbone? (was: Royal Wedding...)
From: Jared Mauch <jared () puck nether net>
Date: Fri, 29 Apr 2011 20:42:49 -0400


On Apr 29, 2011, at 3:44 PM, John Levine wrote:

Delivering multicast to end users is fundamentally not hard. The
biggest issue seems to be with residential CPE (pretty much the same
problem as IPv6, really).

Well, more than that, since I don't really want my DSL pipe saturated
with TV that I'm not watching, you need some way for the CPE to tell
the ISP "send me stream N"

There are CPEs that do this, but some don't do it on a public IP network.

Additionally, considering the state of the home CPE market and how horrible it is, I doubt it will get better anytime 
soon.  You have to look no further than the copious numbers of "IPv6 Ready" devices on the shelves in stores today.  
Oh, and the fact that the NAT on the v4 side breaks multicast.

I suppose with some sort of spanning three thing it'd even be posssible
to do that at multuple levels, so the streams are only fed to people
who have clients for it.

This is what IGMP+PIM already do, sometimes with layer-2 support from switches, sometimes not, all depends on your 
topology.

- Jared

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