Allied Telesis NETEXTREME II AT-2973SX - Manual (Page 146)

Chapter 11: Troubleshooting
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The ping statistics that are displayed indicate whether the network
connection is working or not.
Linux
To verify that the Ethernet interface is up and running on a Linux platform,
run ifconfig to check the status of the Ethernet interface. In addition,
you can enter the netstat -i command to check the statistics on the
Ethernet interface. See “Installing Linux Driver Software” on page 68 for
information on ifconfig and netstat.
Ping an IP host on the network to verify connection has been established.
From the command line, type ping IP address, and then press Enter.
The ping statistics that are displayed indicate whether or not the network
connection is working.