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Troubleshooting IP multicast

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Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Troubleshooting IP multicast

What problem are you having?

The IGMP router does not work correctly.

Cause:  The network adapters that are installed may not support multicast promiscuous mode.

Solution:  Multicast promiscuous mode is a special mode of the network adapter in which all multicasted traffic is passed up to the network operating system. Not all network adapters support multicast promiscuous mode. If a server running Windows Server 2003 fails to put the network adapter into multicast promiscuous mode during the initialization of the IGMP router component, then an event is logged in the System Event Log. The event has the following attributes:

  • Source: IP Router Manager

  • Event ID: 20157

  • Message text: The interface [name of the interface] could not be enabled for multicast. IGMP router will not be activated over this interface.

See also:  Using the IP multicasting utilities