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Slow Multicasting ~ 50Mb/Min SOLVED

Created: 25 Mar 2009

Solved in our case anyway.

Would you believe it if I told you that the cause of our multicasting woes was a PC attached to the network that was NOT turned on but it WAS turned on at the wall socket?

There is a little more to it than that, but not much more.

Any PC with an Intel 82566DM-2 card can cause this issue.

When powered down but not off at the wall socket by the card will (by default) drop its connection speed to 10Mbit.

I haven't looked in to why this would cause every multicast job to run slowly but I guarantee it does (at least in our case).

We spent the whole day testing, and finally proved that this is our issue.

There are two resolutions to this:

  1. Disconnect the offending PC from the network, either by patch cable or power off at the wall.
  2. In Windows, the lan connection properties, network card configuration, power saving tab, deselect the tick box by Reduce link speed during standby.

I really hope this helps someone else, we've been scratching our heads about this problem here for months.