All things related to multicast

[Marshall Eubanks <>]

Alan;


Were you sending out SAP ? Did you make use of the I2 Multicast calendar 
that Lucy Lynch maintains ?

Alan Crosswell wrote:

> For this event we did today, we had upwards of 300 simultaneous real
> viewers out of about 1058 unique IPs.  Of those, 708 were on my campus
> and capable of viewing the multicast (only 65 did in fact view the
> MPEG1 multicast).  Another 116 real viewers were on Columbia campuses
> that *should* be multicast enabled but are not (yet).  Of the 234
> "remote" (non-Columbia) viewers a large percentage are I2 member sites
> that could have been using multicast followed by the usual cable modem
> and DSL suspects who I'm sure many of are in our neighborhood.  (Does
> anyone already have a script lying around to take a list of IPs and
> find out what ASNs they are in?)


If you have access to a router or a looking glass, its just

show ip bgp <address>

I have scripts that come very close to this for cisco IOS


> I suspect the 65 MPEG1 viewers is largely attributable to the fact
> that we had a .sdp file link as well as a .ipt file so that Quicktime
> 6 viewers could watch.  Very few people seem to go through the trouble
> of installing IPTV viewer....  Looking at the http access log, it's
> 5-to-1 .sdp vs. .ipt and also about 5-to-1 Windows vs. Mac Quicktime.
> And, I've found the Windows quicktime playback of RTP MPEG1 to be far
> inferior to IPTVs.



Which audio were you using ? Layer II or III ? I have had decent 
performance using RealPlayer if the audio is Layer II - and I
like Layer III MPeg-1 on Quicktime on my Macs.


> We haven't tried using Real's "scalable multicast" features.... (or
> ASM just yet).
>
> /a
Re: need to get the word out about multicast on your campus!


Did you have anything specific in mind ?

--
                                 Regards
                                 Marshall Eubanks



T.M. Eubanks
Multicast Technologies, Inc
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