[Udpcast] Two or more clients drops bandwith by 2 orders of magnitude

Brent Kimberley Brent.Kimberley at Durham.ca
Sat Jul 3 12:17:36 CEST 2021

Please ensure you are using UDP/IGMP.

Hi, (I hope this list is still active)
I am a newbie. I am testing multicast support on three computers connected
through a gigabit switch. When only the server, ran as (rand.bin is a 1Gb
udp-sender --interface eth1 --file rand.bin
and ONE client
udp-receiver --file rand.bin
are connected, the bandwidth is around 937.32 Mbps, which is very good. But
with two or more clients if consistently drops to 11 Mbps
I would expect to bandwidth to decrease as 1/N, where N is the number of
What am I missing?
I am using a dumb switch.


Best regards / Cordialmente,

William-Fernando Oquendo
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