IGMP Router Changes Negative MFEs to Active and Forwards Packets Needlessly on Same LAN Segment (279096)

The information in this article applies to:

Microsoft Windows 2000 Server
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Professional

This article was previously published under Q279096

SYMPTOMS

When the recipient of multicast packets is on the same LAN segment as the sender of the multicast, the Internet Group Management Protocol (IGMP) router changes the Negative multicast forwarding entries (MFE) to Active, causing the router to forward packets needlessly.

This behavior also creates duplicate packets on the local LAN, which will break any multicast audio or video application.

CAUSE

This behavior occurs because of a problem in the Rtm.dll file.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

The English version of this fix should have the following file attributes or later:


   Date        Time    Version        Size     File name 
   ----------------------------------------------------- 
   11/06/2000  11:35p  5.0.2195.2667  97,040  Rtm.dll

NOTE: Replace the Rtm.dll file with the new version in both the Winnt\System32 folder and the Winnt\System32\Dllcache folder.

STATUS

Microsoft has confirmed that this is a problem in Microsoft Windows 2000. This problem was first corrected in Windows 2000 Service Pack 2.

MORE INFORMATION

For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Modification Type:	Minor	Last Reviewed:	9/26/2005
Keywords:	kbHotfixServer kbQFE kbbug kbfix kbQFE kbWin2000PreSP2Fix KB279096