Re: Multicast

[Gunnar Lindberg <lindberg at CDG.CHALMERS.SE>]

Please explain what's wrong with my take on multicast scalability:

Every time a new sender shows up, the entire multicast core (RPs,
right now those running MSDP in the default free zone) has to be
informed. To "show up", the host just starts sending data.

Every time a new receiver shows up, its nearest RP has to initiate
a data distribution path (tree) torwards the sender(s). This is
likely to involve at least some of the core routers.

Scalability problems:

    1)	An indivivual sender - host, my Linux PC - affects routing
	information in the entire router core. Just send data.
	There are a few hosts on the Internet.

    2)	As if his wasn't enough, consider the potential for DoS-
	attacks. The recent Ramen worm was the first(?) example;
	who can claim it was the last?

Assume technology evolves fast enough to solve 1). We still have 2).

My claim is that it doesn't scale to allow individual hosts to affect
the Interet core routing system. What do I miss?

	Gunnar Lindberg