What is NIC ordering on bootup of Linux machines? what is its significance ? can anyone tell in detail.

There are certain situations (usually concerning automation and repeatability) where you would like a machine to configure a particular way on boot. A common case is in a system like Emulab where there are potentially hundreds of machines that need to be configured and automated in a very particular way.

The details of how to make such configuration changes can be found by searching docs or forums online (here is one link with example code).

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