OpenVZ network down SIOCADDRT: Network is unreachable

Have you ever come across in a situation where the VPS is running, but network is unreachable?  OpenVZ VPS may be up and running, but network service will be down resulting downtime for websites hosted in it. If you try to restart the network, you will get the below error:
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[root@pers ~]# /etc/init.d/network restart
Shutting down interface venet0:                            [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface venet0:  SIOCADDRT: Network is unreachable
SIOCADDRT: Network is unreachable
====================================
To fix this, SSH into the main node server and enter into the VPS and  then execute the below comand.
/etc/sysconfig/network-scripts/ifup-routes venet0:0

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