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a stupid suggestion: did you try to reboot your nodes? also did you try to create a new network to see if the issue persists for newly-created networks? Also, please take a look here https://ask.openstack.org/en/question/47496/why-can-my-instances-not-ping-the-neutron-router/ and

a stupid suggestion: did you try to reboot your nodes? also did you try to create a new network to see if the issue persists for newly-created networks? Also, please take a look here https://ask.openstack.org/en/question/47496/why-can-my-instances-not-ping-the-neutron-router/ andand here https://ask.openstack.org/en/question/47207/vm-instanance-not-pingable-from-external-network/ and this https://ask.openstack.org/en/question/47933/why-can-my-instances-not-ping-host-vice-versa/ (iptables -A INPUT -p gre -j ACCEPT; iptables -A OUTPUT -p gre -j ACCEPT) for possible reasons