Add temporary routes centos

To add a temporary route on the fly just to make quick testing :

ip route add 172.33.1.0/24 via 10.138.0.89 dev eth0

To Make a permanent entry update:

 vim  /etc/sysconfig/network-scripts/route-eth0

172.33.1.0/24 via 10.138.0.89 dev eth0
# service network restart