Microsoft KB Archive/289211

= Newly Added Static Route Is Gone After Reception of ICMP Redirect Message =

Article ID: 289211

Article Last Modified on 3/1/2007

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APPLIES TO


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

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This article was previously published under Q289211



SYMPTOMS
After you add a static route to the route table of a host computer, the static route is deleted if that host computer receives an Internet Control Message Protocol (ICMP) redirect message from the same gateway that is defined in the static route. After 10 minutes, you can no longer reach the host for which you added the route.



CAUSE
This behavior occurs because Windows 2000 handles redirects without first verifying that the address of the first new hop is different from the source of the redirect. The route that is obtained by the ICMP redirect overwrites the static route and is added to the route table, but for only 10 minutes.



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 Microsoft Windows 2000.

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



MORE INFORMATION
195686 Explanation of ICMP Redirect Behavior

244539 Host Route Can Be Deleted if ICMP Fragmentation Is Needed

Keywords: kbbug kbfix kbnetwork kbwin2000presp2fix KB289211

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