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Each external network number that identifies a LAN on your IPX network must be unique. Incorrect configurations and other problems can cause two LANs to have the same external network number.
One way in which this can occur is when a bridge connecting two LAN segments fails---a condition known as a split LAN . When the bridge fails, each segment becomes a separate LAN but retains the same network number. As a result, routers forwarding packets to that network number see two destinations and simply choose the nearest one.
To check your network for duplicate network numbers, load IPXCON and follow this path:
Select NLSP Information > LANs
The LANs are listed in numeric order by network number. To look for duplicate network numbers, scroll through the list of LANs.
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