Manually IP

Method 1
--------
#system-config-network

Method 2
--------
#system-config-network-tui

Method 3
# cd /etc/sysconfig/network-scripts/ //directory
# nano ifcfg-eth0

//FOR IP ADDRESS AND SUBNET MASK
# Intel Corporation 82573E Gigabit Ethernet Controller (Copper)
DEVICE=eth0
BOOTPROTO=static
DHCPCLASS=
HWADDR=00:30:48:56:A6:2E
IPADDR=10.10.29.66
NETMASK=255.255.255.192
ONBOOT=yes

//FOR GATEWAY
# vi /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=www1.nixcraft.in
GATEWAY=10.10.29.65

//FOR DNS
# vi /etc/resolv.conf
nameserver 10.0.80.11

//RESTART
# /etc/init.d/network restart