ip route keep changing after network restart
Solution 1:
Adding IP Routes via commandline is only temporary, to add the routes permanently, you must add them to the per-interface files in /etc/sysconfig/network-scripts/.
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/deployment_guide/sec-configuring_static_routes_in_ifcfg_files