Re: multicast at the data layer (layer 2) non-flooding ?
- From: "George Nychis" <gnychis@xxxxxxxxx>
- Date: 25 Jan 2006 16:13:32 -0800
Thanks for the response, but I think you're missing my main question
you say:
At the link layer, when you join a multicast group, you inform your
kernel (or whatever contols the TCP/IP stack in your OS of choice) that
you want to listen for certain traffic, traffic that will have a
defined data link address.
I understand this about multicasting, however what I am wondering is
controlling the multicast data from being flooded in the network.
What you're saying is you tell your kernel you want to listen for
certain traffic... which is of course the multicast traffic. However,
what I am wondering is what kind of technology is out there at the
router to prevent those not in a multicast group from getting the
multicast flooded messages.
For instance, you join a multicast group, and I do not. However if we
are on the same router, as you said, the multicast message gets flooded
and we both get it. You told your kernel you want to receive those
messages, so you receive it. I did not, so i drop the message. The
message still came to my link though. I want to prevent it from ever
being put on my link, i do not even want to hear it.
I think I found an article as to what I was talking and asking about
though and an answer:
http://www.intelligraphics.com/articles/ipmulticasting2_article.html
.
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