Linux Administration Cookbook

Configuring a new interface

Start by creating a configuration file for eth2:

$ sudo touch /etc/sysconfig/network-scripts/ifcfg-eth2

Next, populate it using the following:

$ sudo tee /etc/sysconfig/network-scripts/ifcfg-eth2 << HERE BOOTPROTO=noneONBOOT=yesIPADDR=192.168.44.10NETMASK=255.255.255.0DEVICE=eth2PEERDNS=noHERE

The tee command is used here. It enables reading from standard input and outputting to a destination of our choosing, in this case, a file.

Now, restart your interface as an individual:

$ sudo ifdown eth2$ sudo ifup eth2

Alternatively, restart networking in general:

$ sudo systemctl restart network

It's generally a good rule of thumb to be the least disruptive when working with components that make up a greater whole. Even ...