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You shouldn't have to directly modify anything in the namespaces created by Neutron. What you should do is check whether you assigned a gateway to your router (over CLI or the dashboard), because as already pointed, there is no qg- interface which has the role of gateway.

Second, if I assume right, the "Public" network is the external one. In that case, I doubt you wanted to create it as a VXLAN network - this would be a rare setup. Try re-creating the network as "Flat", you can do that as the "admin" user. When prompted for "Physical interface", type in the value that is mapped to "br-ex" under the directive "bridge_mappings" in /etc/neutron/plugins/ml2/ml2_conf.ini .