DHCP:
vim /etc/sysconfig/network-scripts/ifcfg-eth0
BOOTPROTO=dhcp
ONBOOT=yes
/etc/init.d/network restart
Static IP:
vim /etc/sysconfig/network-scripts/ifcfg-eth0
BOOTPROTO=none
ONBOOT=yes
IPADDR=192.168.1.10
NETWORK=192.168.1.0
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
/etc/init.d/network restart