Network problems
Detect network problems using ping at the filer console
You can detect network problems by going to the filer console and using the ping command.
What the ping command does
The ping command checks whether the filer can communicate with other hosts on the network and that other hosts can communicate with the filer.
How to troubleshoot network problems
If the filer should be able to connect with a host but ping does not respond with a message indicating that the host is alive, complete the steps in the following table to troubleshoot the problem.
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Step
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Action
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1
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Check that the network cable is tightly connected to the proper interface connector.
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2
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Use the ifconfig command to verify that the IP address and netmask are set correctly and that the up and running flags are displayed.
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3
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Use the arp -a command to confirm that the filer has the correct IP-to-Ethernet address map for the host you are trying to reach.
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4
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Use the netstat -r command to examine the routing tables.
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5
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Use the netstat -i command to check for excessive errors on the interfaces.
If you see excessive input errors (ierrs) or output errors (oerrs), check the network connections on both ends of the connection. Bad transceivers or network hubs can sometimes introduce errors into the network.
Collisions reported by netstat are a concern only if the filer detects a substantial percentage of collisions as compared to the total packet throughput.
Note: The goal is to keep collisions below 5 percent, but a network can operate properly, but slowly, with collision rates as high as 30 percent.
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6
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Use the routed status command to determine the status of the default router.
Note: An improperly set up network router can also cause network problems. If a router is not working correctly or is not configured with the filer's address, clients or hosts on the other side of the router cannot access the filer through that router.
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7
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If you are using the filer on a CIFS network and you are experiencing difficulty accessing the filer using name-based IP operations, for example, ping toaster, create static mappings on your WINS servers for each of the filer's interfaces.
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Contact technical support about other network problem
If you encounter other problems, contact Network Appliance Technical Support for assistance, as described in "Getting technical assistance."
Copyright © 1999, Network Appliance, Inc. All rights
reserved.
Part No. 210-02334
File: trbl17.htm
Last updated: 04/26/99 08:11:58