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can't ping my cirros instance on devstack

Hello everyone,

I'm new to openstack, i m on windows and i used virtualbox to install ubuntu 16.04 LTS. Then I followed the official doc to install devstack. Everything is fine.

I created 2 networks : one private and another one public (external), i linked them by a router and then i created a cirrOS instance.

My security group has ssh and ICMP allowed, I can ping the gateway for the public network but i can't ping my instance (associated to a floating IP) and i get : host unreachable as an error ...

I spent the past week trying to solve the problem but no success ...

Could anyone help me please ?

Thank you guys,