CentOS
Networking
Manual
ip addr add 192.168.0.2/24 dev eth0
ip route add devault via 192.168.0.1
Static
Create or edit a file /etc/sysconfig/network-scripts/ifcfg-eth0
with content:
DEVICE=eth0
IPV6INIT=no
IPV6_AUTOCONF=no
ONBOOT=yes
IPADDR=192.168.0.2
NETMASK=255.255.255.0
GATEWAY=192.168.0.1
NM_CONTROLLED=no