Novell NETWARE 6-DOCUMENTATION Manual page 1399

Troubleshooting the NAT Support Feature
If the NAT support feature is not working, check whether:
The Service Location Protocol Directory Agent (SLPDA) has been
loaded on one server and pointed to by all the servers that need to
communicate using NAT.
The NAT router public interface has been set to RIP Receive Only.
All clients in the private realm are pointing to a private interface of the
NAT router.
Default routers are specified on servers.
Set the value for NAT Dynamic mode to pass through to "ON". Also, use
display SLP services to see if the services are visible on both sides of the NAT
router.
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