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You need to check your security group rule that you have assigned to your instances. If you have assigned the default security group then you have configure it to allow ICMP traffic. You can do that through Horizon, or by using the nova cli command (nova client)

nova --no-cache secgroup-add-rule default icmp -1 -1 0.0.0.0/0

Similaly to allow traffic on port 22 (SSH) you can run this command

nova --no-cache secgroup-add-rule default tcp 22 22 0.0.0.0/0

Hope that helps !!