[streaming] Re: DVB streaming !

[Matthew Geier]

Romuald CARI wrote:
> Hi everybody !
> 
> I'm experiencing a strange problem with VLC while streaming my channels 
> over my network in multicast. As soon as I start streaming my channels, 
> the network seems to be saturated.

> My network is private : 172.16.0.0 / 255.255.0.0, no routers.
> DNS server do not respond anymore and no ping can travel through the 
> network. As soon as I stop it, everything goes back to normal.
> I don't have a complete access to the network hardware but I was told 
> that it is 100Mbit/s fully switched (no hubs, which I doubt to be 
> true...) with 1Gbit/s uplinks.

  Are your ethernet switches multicast aware ?. If not, they will flood 
the multicast's out every port like a broadcast, and it's quite possible 
you will really then flood the network - and if your router/dns server 
is at the other end of a 10mb port, it will get saturated by the 
unfiltered multicasts.

  The switches on my network are running a combination of Cisco CGMP in 
which the router and the switches work together to multicast filter, and 
IGMP snooping where the switch looks for the group join/leave IGMP 
packets and acts appropiately by itself.
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