Testing the Network Controller

To test the primary network controller, type:

ok test net 
Internal Loopback test - (result)
External Loopback test - (result)
ok 

The system responds with a message indicating the result of the test.

Depending on the particular network controller and the type of network to which your system is attached, various levels of testing are possible. Some such tests may require that the network interface be connected to the network.