def _port_has_ipv6_address(self, port, csnat_port_check=True):
        if csnat_port_check:
            if port['device_owner'] == const.DEVICE_OWNER_ROUTER_SNAT:
                return False
        return super(L3_NAT_with_dvr_db_mixin,
                     self)._port_has_ipv6_address(port)
Overridden to return False if DVR SNAT port.
dataset/ETHPy150Open openstack/neutron/neutron/db/l3_dvr_db.py/L3_NAT_with_dvr_db_mixin._port_has_ipv6_address