Communication Through FDDI to MAC Address Fails

 Last reviewed: May 16, 1997
Article ID: Q117414
The information in this article applies to:
  • Microsoft Windows NT operating system version 3.1
  • Microsoft Windows NT Advanced Server version 3.1

SYMPTOMS

When Windows NT tries to communicate through an FDDI card to a computer with a MAC address that has the MSB set, the two computers are not able to communicate.

CAUSE

The high bit of the MAC address is being cleared in the response from the Windows NT computer. If Windows NT receives a packet that has a source MAC address of AA0000000001, it responds to MAC address 2A0000000001 (the MSB of the MAC address has been cleared).

STATUS

Microsoft has confirmed this to be a problem in Windows NT and Windows NT Advanced Server version 3.1. This problem has been corrected in Windows NT Workstation and Windows NT Server version 3.5. This problem has also been corrected in the latest U.S. Service Pack for Windows NT and Windows NT Advanced Server version 3.1. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces): 

   S E R V P A C K

Additional query words: prodnt
Keywords : kbbug3.10 kbnetwork ntnetserv NTSrvWkst
Version : 3.1
Platform : WINDOWS

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Last reviewed: May 16, 1997
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