Microsoft KB Archive/247604
The information in this article applies to:
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 127.0.0.1 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
Last Reviewed: December 29, 1999