All things related to multicast

> If so, then this was one of the bigger simultaneous multicast audiences so 
> far.
> 
> 
> This sounds to me like that things are actually working correctly. The MSDP
> messages are presumably being generated by the Receiver Reports (RR) being 
> sent
> by receivers.

oh wow. now that i'm looking at the port info, it would appear that the 
majority of the clients were listening to the RTP streams (port 4446/4448) 
versus using vbrick's propriatary stream (port 4444 - which isn't RTP). 
this means there were potentially a few more people listening that 
weren't becoming sources....? i'll have to look at this tomorrow.