Verify that the GPIB Ethernet interface is reachable on your network using the ping network command.
You can check if a port is on the same subnet by plugging a computer into that port and comparing its subnet to the subnet the computer that is attempting the discovery.
Firewalls can block traffic that needs to pass between NI-488.2 and a GPIB Ethernet interface. The following ports should be open for proper communication:
For GPIB-ENET/100 devices:
For GPIB-ENET/1000 devices:
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A valid service agreement may be required, and support options vary by country.