[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 
> >advertised?
> 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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