Microsoft KB Archive/237745

= NetBIOS SEND.NO.ACK and CHAIN.SEND.NO.ACK Cause DATA_ACK Frame to Be Sent =

Article ID: 237745

Article Last Modified on 2/27/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows 2000 Datacenter Server

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This article was previously published under Q237745



SUMMARY
If a NetBIOS session is opened between two programs and the SEND.NO.ACK or CHAIN.SEND.NO.ACK bits are set to true in a DATA_ONLY_LAST frame sent to a remote Windows 2000 client, the receiving client sends a DATA_ACK frame in response.



MORE INFORMATION
A DATA_ONLY_LAST frame with the bits mentioned above set to true should not result in a DATA_ACK frame being sent. This response occurs in Windows 2000 to accommodate older NetBIOS clients such as IBM OS/2 2.1. This behavior causes no problems; the server that sent the packet simply drops the acknowledgment.

For additional information, please click the article number below to view the article in the Microsoft Knowledge Base:

63374 LAN Man NetBIOS Performance Enhancement to Reserved Bits

Keywords: kbinfo kbnetwork KB237745

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