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Cannot ssh or ping my cirros instance

I have one network card enp0s3 with ip and its connected to internet. I have successfully launched a cirros instance on OpenStack-queens with floating ip and its gateway is My instance private network ip is I have set the security rules for icmp as well as ssh(ingress and egress as well). I can ping or ssh to the instance using ip netns exec command but i am not able to ssh or ping to my instance from public network. I have tried all possible solutions on this issue but i am not able to figure out problem with my system