On Thu, Jul 30, 2009 at 9:47 AM, Nicola Caldera<nicola.caldera at hotmail.it> wrote: > The problem is that I always flodded the network from various channels. > What multicast router do you use? > You may help me? Your switches must support IGMP. And you'll need an igmp querier, normally the router handles this part. It it's an linux router, try xorp.