Novell NETWARE 6-DOCUMENTATION Manual page 1861

Connectivity Is Lost on Only One LAN
NetWare Mobile IPX Client Loses Connectivity to the Server
150 Internetwork Packet Exchange
required by an NLSP area. We recommend that you do not exceed 400 LANs
and routers (total) in any single NLSP area. It is also possible that two areas
have merged when they should not have. Determine whether routers are in the
area that should not be there. Prevent the areas from merging or use area
addresses.
Cause 2 —Backbone has been imported multiple times into the NLSP area.
NLSP is careful about the way that it imports external routes and services into
the NLSP network. For example, only the Designated Router on a LAN
imports information. Usually, if two NLSP systems are connected to the same
RIP backbone but they are on different LANs, a conflict does not occur. If RIP
reports two different routes to the same location, only the RIP route with the
shortest hop count is imported into the NLSP network. However, it might be
that most of the backbone is imported more than once. This can occur if there
is more than one equal cost path from the NLSP network to the RIP network.
To determine whether most of the backbone has been imported more than
once, look carefully at all routers that are importing RIP.
Using IPXCON, find the systems that are importing RIP into the NLSP area,
then determine whether RIP Active is displayed for the LAN (parameter path:
Select NLSP Information > LANs). Find the Designated Router in each LAN.
Look at the Forwarding table of each Designated Router. If more than one
Designated Router is on the LAN, this is probably because you have turned
off NLSP on the routers. In this case, you must run NLSP between the routers
to reduce the amount of imported information on each LAN.
Connectivity is not possible on a single LAN, but it is possible on other LANs.
This almost certainly indicates a duplicate network number. Refer to
Communication Occurs between Two Networks" on page 142
Usually, the network number that is the duplicate does not have the
connectivity.
The NetWare Mobile IPX client loses connectivity to the server.
If you lose connectivity before you start an operation, you will see messages
such as Access Denied , or it might look as if access is not available on
your network drives. If you lose connectivity after you start an operation, you
will receive a DOS critical error message that asks you whether you want the
"No
for the solution.