Installing and Administering LAN/9000 Software

86 Chapter4

Troubleshooting LAN/9000

Diagnostic Flowcharts

Flowchart 2 Procedures

A. Execute: ifconﬁg <interface>. Execute ifconfig on the

interface you want to test. For example, to check LAN

interface lan0, enter:

ifconfig lan0

B. ifconﬁg successful? ifconfig is successful if the output

shows the correct Internet address and the ﬂags,

typically: UP,BROADCAST,RUNNING.

C. Any error message returned? If ifconfig is not

successful, and an error message appears, go to

Flowchart 3. Flowchart 3 shows common error

messages and what to do for each.

D. Correct ifconﬁg ﬂag settings. If ifconfig returns an

incorrect ﬂag setting, re-execute the command with the

proper setting. For more information, refer to the

ifconfig(1M) man page. Start again with Flowchart

2, as necessary.

E. Execute: netstat -i. If ifconfig is successful, you know

the network interface has been conﬁgured correctly.

Using netstat, you can return statistics which show

the interface is operational. Enter:

netstat -in

netstat statistics give a quick check of key operating

parameters. For instance, if the Opkts value does not

change after attempting the ﬁle transfer, packets are

not being transmitted. Similarly, if the Ipkts value

does not change, packets are either not being received

by the local node or are not being sent by the remote

node, which may not be receiving your transmissions.

F. Interface name correct? Verify that the name for your

interface is what you expect. See the ifconfig(1M)

man page.

G. Correct encapsulation using ifconﬁg. Use the ifconfig

command to correct the encapsulation method of your

interface. For more information, refer to the

ifconfig(1M) man page. Go to E.

H. Suspect LAN card I/O problems? If the statistics