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Hello @gaurav_garg.

  1. Make sure that your instances have floating ip addresses.
  2. Make sure that your security rules allow pinging (egress and ingress rules)
  3. Make sure that you configured the instances to use the correct gateway. The gateway should be accessible by the instances and should exist because when you don't specify the gateway ip to be used by the instances OpenStack neutron will pick the first ip address from the provided network and uses it as a Gateway IP (not always the case)