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There are 4 network Interfaces, how can we find which one
is Primary.
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Answer Posted / ashish
When you type the command netstat -nr in your shell, you
will find a line starting with 0.0.0.0. Something like
0.0.0.0 192.168.0.4 0.0.0.0 UG 0 0 0 eth0
This line indicates if the system tries to contact a
network outside its local network. It will first contact
the router 192.168.0.4 and it does it with the primary
interface. Hence in this case its eth0. So you can check
this line for the primary interface
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