After you issue several Update Routes commands from the Routing and Remote Access Service server, the IPX network number of the WAN link gets changed from all zeros to a number other than zero. This causes the Routing and Remote Access Service server to drop all Routing Information Protocol (RIP) & Service Advertising Protocol (SAP) packets coming from the remote router. You then lose all connectivity to the other router and the networks it is connected to.

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The router defaults to unnumbered WAN links with Routing and Remote Access Service for Windows NT Server 4.0. If the Network number for the remote router changes to anything other than all zeros the local router will drop all RIP and SAP packets from the remote router.

For example:
To verify you are seeing this problem, do the following. Go to a command prompt on each router and type:
You should see something similar to this depending on how many network cards are installed, and so on.



If the NdisWan device's network number is something other than all zeros, then you are experiencing this problem.

This is how it should look:

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This problem will only happen if it is an unnumbered WAN Link. For additional information about how to work around this problem by disabling unmumbered WAN links, please see the following article(s) in the Microsoft Knowledge Base:

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

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