• Use ifconfig command:

# ifconfig eth0 192.168.1.5 netmask 255.255.255.0 up

• Find the configuration file corresponding to the NIC for which you want to set a static IP and edit it.

# cd /etc/sysconfig/networking/devices
# vi ifcfg-eth0

• Now set the parameters below according to your settings

DEVICE=eth0
BOOTPROTO=none
HWADDR=00:0C:29:DE:94:8B
ONBOOT=yes
TYPE=Ethernet
USERCTL=no
IPV6INIT=no
PEERDNS=yes
NETMASK=255.255.255.0
IPADDR=192.168.0.100
GATEWAY=192.168.0.1

• To set the nameservers, change directory to /etc and edit resolv.conf.

# cd /etc
# vi resolv.conf

• The file format should be like this:

search your-dns-search-path
nameserver dns1-ip-address
nameserver dns2-ip-address
nameserver dns3-ip-address

• Now save the configuration file and exit the text editor. To apply changes, we need to bring the network interface down and back up.

# ifdown eth0
# ifup eth0