[Udpcast] Trouble with a 3com-812 router

Alain Knaff alain at knaff.lu
Wed Jun 14 11:49:49 CEST 2006

Paco Cruz wrote:
> Hello all
> I a have setup udpcast in a classroom at a Secondary School to 
> distribute CDs and whole directorie trees, and it works like a charm, 
> except for a minor nuissance.
> Everytime I want to use udpcast I have to disconnect from the 3com-812 
> router that serves as a gateway.
> When I try to send anything with the gateway connected there is an 
> extremely low transmission with errors el al. As soon as I disconnect 
> the router the throughput goes up to 70-90 Mbps.
> Does anybody have any hint?
> Thank you all

Could be that the router is using a link speed of 10 Mbps, or slowing 
everything down with flow-control packets.

Several solutions are possible, depending on the switch:

- Try enabling IGMP support if available (so that only those ports 
interested in the transmission do get the traffic)
- Try disabling flow control (some switches support this on a per-port 
basis... If that is the case, you only need to disable flow control on 
the port to which that router is connected)



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