Dell PowerVault 720N, Command Reference Manual, Page: 385 / 606

Troubleshooting18-13
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The
ping
command checks whether the filer can communicate with other hosts on
the network and that other hosts can communicate with the filer.
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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 following steps to trouble-
shoot the problem:
1. Check that the network cable is tightly connected to the proper interface
connector.
2. Use the
ifconfig
command to verify that the IP address and netmask are set
correctly and that the up and running flags are displayed.
3. 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.
4. Use the
netstat -r
command to examine the routing tables.
5. 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 substan-
tial 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.
6. 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, cli-
ents or hosts on the other side of the router cannot access the filer through that
router.
7. 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 filer, create
static mappings on your WINS servers for each of the filer’s interfaces.
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If you encounter other problems, contact Dell technical support for assistance, as
described in “Getting Technical Assistance.”