This error message is produces because Neutron uses CT target: https://github.com/openstack/neutron/blob/2cc3a780853686cc1fbf3123402cb7862c9bb12c/neutron/agent/l3_agent.py#L1613
which is not supported in CentOS 6.5 (NOTRACK target should be used instead). CT target was introduces in RedHat 7 with 3.10 kernel.
This error message is produces because Neutron uses CT target: /github. com/openstack/ neutron/ blob/2cc3a78085 3686cc1fbf31234 02cb7862c9bb12c /neutron/ agent/l3_ agent.py# L1613
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which is not supported in CentOS 6.5 (NOTRACK target should be used instead). CT target was introduces in RedHat 7 with 3.10 kernel.