How to Configure Static IP Address on CentOS 6.3 Linux Host

This post shows the steps to configure static ip address, default gateway, netmask, dns server and make a network auto start at boot on linux CentOS 6.3 host normally configured with static ip address, so that easier to maintain the configuration on it’s client and DNS server will always able to resolve it.

DEVICE="eth0"
BOOTPROTO="dhcp"
HWADDR="xx:xx:xx:xx:xx:xx"
NM_CONTROLLED="yes"
ONBOOT="no"
TYPE="Ethernet"

1. Configure eth0:

[root@centos ~]# nano /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE="eth0"
BOOTPROTO="static"
HWADDR="xx:xx:xx:xx:xx:xx"
NM_CONTROLLED="yes"
ONBOOT="yes"
TYPE="Ethernet"
IPADDR=192.168.3.3
NETMASK=255.255.255.0

2. Configure Default gateway:

[root@centos ~]# nano /etc/sysconfig/network

NETWORKING=yes
HOSTNAME=centos.somedomain.local
GATEWAY=192.168.13.1

4. Configure DNS server :

[root@centos ~]# nano /etc/resolv.conf

nameserver 8.8.8.8