Microsoft KB Archive/247604

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TCP/IP Does Not Support Blackhole or Reject Routes

ID: Q247604

The information in this article applies to:

  • Microsoft Windows 2000 Server


The Transmission Control Protocol/Internet Protocol (TCP/IP) protocol in Microsoft Windows 2000 Server does not provide a 'blackhole' (or reject) route to silently drop a packet that cannot be forwarded to its destination. This situation can cause routing loops.


To work around this behavior, create an IP-in-IP tunnel that uses one of the router's normal IP addresses as a source address and as a destination address. Then add a 'blackhole' route as a static route over this interface.


This behavior is by design.

Additional query words: rras route

Keywords :
Version : WINDOWS:2000
Platform : WINDOWS
Issue type : kbbug

Last Reviewed: December 29, 1999
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