How to configure network interfaces in CentOS

In CentOS, Fedora or RHEL, you can configure network interfaces by using configuration files located in /etc/sysconfig/network-scripts/. For each network interface (e.g., eth0), there should be a corresponding configuration file (e.g., ifcfg-eth0) in the directory. If you would like to configure a network interface, do the following.

$ sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0

If you would like to assign a static IP address to the interface:

DEVICE=eth0
BOOTPROTO=static
HWADDR=00:05:29:E0:4F:3D
IPADDR=10.0.1.10
NETMASK=255.255.255.0
GATEWAY=10.0.1.1
ONBOOT=yes
TYPE=Ethernet

If the interface has IP address assigned by DHCP:

DEVICE=eth0
BOOTPROTO=dhcp
HWADDR=00:05:29:E0:4F:3D
ONBOOT=yes
TYPE=Ethernet

Once network configuration has been created/updated, you can activate a network interface by running:

$ sudo service network restart

Note that if you are using Desktop version of Linux, you will need to disable NetworkManager first, before attempting to configure interfaces as described above.

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Dan Nanni is the founder and also a regular contributor of Xmodulo.com. He is a Linux/FOSS enthusiast who loves to get his hands dirty with his Linux box. He likes to procrastinate when he is supposed to be busy and productive. When he is otherwise free, he likes to watch movies and shop for the coolest gadgets.
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