Microsoft KB Archive/289165

= Client Retains Lower MTU on Subsequent Transmissions to Multicast Route =

Article ID: 289165

Article Last Modified on 1/31/2007

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APPLIES TO


 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Service Pack 1

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This article was previously published under Q289165



SYMPTOMS
When a client receives an Internet Control Message Protocol (ICMP) message that states &quot;Destination Unreachable&quot;, along with &quot;fragment needed and DF set&quot; message indicating that a lower Maximum Transmission Unit (MTU) is needed for a multicast route, the client uses the lower MTU for all subsequent transmissions to that route (multicast address).



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 the Microsoft products that are listed at the beginning of this article.

This problem was first corrected in Windows 2000 Service Pack 2.



MORE INFORMATION
When the client receives an ICMP &quot;Destination unreachable&quot; message indicating need for a lower MTU for a multicast route, it should not modify its MTU. MTU modifications should be made only for unicast routes.

Keywords: kbbug kbfix kbwin2000presp2fix KB289165

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