Microsoft KB Archive/117414

= Communication Through FDDI to MAC Address Fails =

Article ID: 117414

Article Last Modified on 10/31/2006

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APPLIES TO


 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.1
 * Microsoft Windows NT Advanced Server 3.1

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This article was previously published under Q117414



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: kbnetwork KB117414

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