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can't ping/ssh VM - dhcp namespace

Hello, I'm trying to configure Openstack Queens on ubuntu 16.04. I configured Neutron following the "network option 1: provider network" guideline. - I created a flat network and an allocation-pool with the option --no-dhcp to avoid possible issues with existing DHCP services on the physical network. - I created new security group rules to allow icmp/tcp traffic but i can't ping my VM. After all these steps I still can't ping my VMs. I checked the dhcp namespace typing "ip netns" and i did't have any result. So i was wondering if the problem was the "--no-dhcp" option i setted. Why don't I have the dhcp namespace?