nano /etc/sysconfig/network-scripts/ifcfg-eth0

Change following parameters to set the IP , Subnet Mask and Default Gateway Address
Do not change other parameters if there are any.
BOOTPROTO=static
ONBOOT=yes
IPADDR=10.10.7.200
GATEWAY=10.10.7.2
NETMASK=255.255.255.0Then Ctrl OThen service network restart