[AG-TECH] IGMPv3, Source Specific Multicast, fully supported in Windows XP
Ivan R. Judson
judson at mcs.anl.gov
Fri Aug 16 14:16:18 CDT 2002
I don't have a problem with that answer (it fits my model of 2.0), but
we still have to have something to argue about. So how do I tell others
what I "can" do?
Ivan R. Judson .~. http://www.mcs.anl.gov/~judson
Futures Laboratory .~. 630 252 0920
Argonne National Laboratory .~. 630 252 6424 Fax
> -----Original Message-----
> From: Bill Nickless [mailto:nickless at mcs.anl.gov]
> Sent: Friday, August 16, 2002 2:00 PM
> To: judson at mcs.anl.gov
> Cc: 'Bill Nickless'; 'Jay Beavers'; ag-tech at accessgrid.org
> Subject: RE: [AG-TECH] IGMPv3, Source Specific Multicast,
> fully supported in Windows XP
> At 01:31 PM 8/16/2002 -0500, Ivan R. Judson wrote:
> >This is something that I have a hard time thinking about.
> My concern
> >is mostly based around the fact that these seem to be things that AG
> >Nodes/Users need to have in the technology portfolio. Ie,
> can the user
> >send more than one stream? What format? What quality? If
> not, who's
> >doing it for them? Is this a network service? Does it need to be
> It seems to me that the best place to code a video stream
> into multiple
> formats is at the sender.
> - The sender has the raw, uncompressed video available by virtue of
> the direct connection to the camera. This eliminates the need for
> decoding a compressed stream and re-encoding it somewhere else.
> - In the multicast transport model, the incoming traffic level is
> generally much larger than the outgoing traffic. Thus, there is
> usually plento of bandwidth available for multiple
> outgoing streams
> at the sender.
> - The receiver knows best which streams are "interesting". By
> choosing which (S,G)s to join, the receiver can help the network
> deliver only the traffic that is necessary for the displays
> currently visible at the local site. Generally, bandwidth
> limitations are closer to the edge than the core of the Internet.
> Bill Nickless http://www.mcs.anl.gov/people/nickless
> +1 630 252 7390
> PGP:0E 0F 16 80 C5 B1 69 52 E1 44 1A A5 0E 1B 74 F7
> nickless at mcs.anl.gov
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