There are 4 network Interfaces, how can we find which one is Primary.

There are 4 network Interfaces, how can we find which one
is Primary.

Question Posted / vegraghu

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There are 4 network Interfaces, how can we find which one is Primary...

Answer / 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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There are 4 network Interfaces, how can we find which one is Primary...

Answer / ponnuswamy senthil

You can use "netstat -nr" in which it displays the ip
address of the interface individually, even if you have
VMware machines in your system,
One more command is "mii-too" in that it displays the
interface status is up when you connect the network cable.
(eg) mii-tool eth0
eth0- link ok up. Negotiated
eth1- no link

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