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DHCP not working FLAT network

Hi, I am following this tutorial: https://docs.openstack.org/install-guide/launch-instance-networks-selfservice.html I created the provider network, and the self-service network The self service network is working without any issue (instance gets the internal ip and uses the router to access internet)

If I connect the instance directly to provider network, the dhcp do not works. I can manually assing a public IP address to the instance and it can access internet, but I cant ping the router or any other instance in the same (or other) compute host.

I disabled firewalld. Using centos 7, openstack train release.

CanĀ“t find any error in the logs. Does someone have an idea what is happening?