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why instances from different networks can ping each other

Hello, I installed OpenStack Newton on Ubuntu 16.04.2 with 3 nodes : controller, compute, block storage.

I created a new project, with three instances, each instance in a separate network : image description

I didn't configure any routing on the router, so I thought that instances won't be able to ping each other but it's not the case !! they all have connectivity to each other.

I don't want instances to have connectivity on each other, I want them only to have access to the provider network, how to do that ?