Hi,

Can anybody tell me how to find out "PRIMARY INTERFACE".

THANKS,
SRINU

That would depend much on the context in which you saw "PRIMARY INTERFACE".

At a guess: It's talking about your primary network interface card (NIC).

The first NIC on most Linux install is labeled as eth0, the second as eth1 etc... Generally most folks would think of eth0 as the "primary" but it depends a lot on what you use it for.

The configuration file for eth0 and other NICs depends on which distro you're running. On Fedora/RedHat/CentOS it would be /etc/sysconfig/ifcfg-eth0. You can typically determine the MAC (hardware) address of the NIC in the configuration file. You could then use tools such as lspci, kudzu or dmidecode to try to match this MAC address to specific slot or device.

Also many newere NICs have the capability to flash using the ethtool command. So if you wanted to find out which NIC was eth0 you could try typing "ethtool -p eth0" then check to see which one started blinking.

I really appreciate for your prompt response.

I got lot of information from your answer.

Here I would like to share some more information to clarify my doubts for the same.(As per CentOS )

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

I got some information for the above question, but I am not much satisfied with the answers given in that.

Please go through the below link for detailed information for the same.

www.allinterview.com/showanswers/81098.html


Thanks in Advance
Srinivas

CentOS uses the same setup as RHEL so my previous answer gives all the information you should need to figure it out.