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Diagnosing Local Area Network
Functional network may go out of order at some point of time. This is when we require some kind of troubleshooting tools so that we may come to know where exactly the problem is? To troubleshoot a network problem first of all we should make sure that there is no physical problem like poor connections, problematic cables and like these.
After this activity we should use any of the following tools:
dmesg, ifconfig, netstat, ping or traceroute etc.
We also can check the log messages or use debugging tools like Ethereal.
Using dmesg
We can type the following command to check whether Linux system has found the LAN card and installed its driver properly:
# dmesg | grep eth
This command will list all the messages those were output by Linux at booting time. But the output will not be displayed on the monitor as this command is piped to grep command. The grep eth command will allow only those lines to print which contain eth word.
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