title: Not able to connect to a Openstack Instance from external machine
body: <p>The IP of of an instance created through Openstack is 10.0.0.2. But when I tried to ping this IP from other machine, it was not successful, however I am able to ping this IP from the machine on which Openstack(Devstack) is installed.
  What could be the reason and how to resolved this?  </p>