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I have solved the issue by re-deploying the CentOS host on native hardware. My previous deployment was: Server hardware ---> Esxi 5.5 ---> CentOS 7 VM ---> Openstack

I eliminated the Esxi layer, installing CentOS 7 directly onto the server. The physical interface name changed from "ens32" to "enp3s0" and everything works fine (public net included) with the exact same settings and configuration as in the non-working scenario.

It looks like Esxi network drivers were not working well with the openstack net drivers, or something like that.