Microsoft KB Archive/255593

= Packets May Be Dropped When A Very Large Number of Fragmented UDP Packets Are in Use =

Article ID: 255593

Article Last Modified on 10/30/2006

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Professional Edition

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This article was previously published under Q255593



SYMPTOMS
When fragmented frames are in use on your network, you may experience intermittent network connectivity problems, and this may include complete loss of connectivity to network resources.



CAUSE
This problem can occur because the TCP/IP driver has a limited number of reassembly queues. After these queues are filled, the driver drops new incoming fragments until the queues recover.



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



STATUS
Microsoft has confirmed that this is a problem in Windows NT 4.0.

This problem was first corrected in Windows 2000 Service Pack 1.



MORE INFORMATION
The conditions that can create this problem are very uncommon because the host would have to be receiving great numbers of large fragments in a high-bandwidth network. Because of this, this problem has only been noted to occur in 100 megabyte (MB) or greater environments.

Additional query words: udp

Keywords: kbhotfixserver kbqfe kbbug kbenv kbfix kbwin2000sp1fix KB255593

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