[streaming] Re: Listing Multicast clients !

[Matthew Geier]

Rémi Denis-Courmont wrote:
> Le Jeudi 15 Décembre 2005 19:03, Romuald CARI a écrit :
> 
>>I'm currently trying to do some statistics about the
>>streams that my server multicasts over my network.
>>The most important thing for me is to count how many people are in a
>>precise multicast group, watching the video stream that is sent to
>>them.
> 
> 
> That doesn't work for Windows computers at least - they don't reply to 
> multicast echo requests.


  They used to. But all it proved was that they had a multicast IP stack.

  Now that Windows Firewall defaults to 'on' they probably no longer 
respond to anything.


>>If this does not exist, is VLC able to answer to some special
>>datagrams sent in the multicast group that it is currently listening
>>to ?

  Cisco implement some sort of multicast feedback channel on their IP/TV 
system so the IP/TV server has some idea of how many clients are 
listening - or at least how many Cisco IP/TV clients are listening, it's 
not going to know about those MacTV and VLC clients....


> I suppose that would be outside the scope of the RTP implementation, by 
> the way. The best way to got these statistics is to poll your routers 
> for IGMP membership via SNMP regularly.

  Apparently this isn't straight forward - out network people can only 
tell me which 'vlan' has a client listening, not how many are down 
there. The required SNMP is there, but they have to write something to 
fetch and process it.


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