Diagnosing network problems

About diagnosing network problems

The netdiag command specifies that any network problems be continuously diagnosed.

After you enter this command, Data ONTAP continuously gathers and analyzes statistics and performs diagnostic tests to identify and report problems related to the physical, network, or transport layers. If any problems are found, the command output also suggests remedial actions.

For information about all the options available with the netdiag command, see the NetApp netdiag(1) man page.

Diagnosing transport layer problems

To diagnose transport layer problems in your filer, complete the following step.

Step	Action
1	Enter the following command: netdiag -t Sample result: A filer whose TCP window size is smaller than the recommended value displays the following output: Performing transport layer diagnostics..... The TCP receive window advertised by CIFS client 10.10.10.10 is 8760. This is less than the recommended value of 32768 bytes. You should increase the TCP receive buffer size for CIFS on the client. Press enter to continue.

Step

Action

Enter the following command:

netdiag -t

Sample result:

A filer whose TCP window size is smaller than the recommended value displays the following output:

Performing transport layer diagnostics.....

The TCP receive window advertised by CIFS client 
10.10.10.10 is 8760. This is less than the recommended 
value of 32768 bytes. You should increase the TCP receive 
buffer size for CIFS on the client. Press enter to 
continue.