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Some weeks ago I have wrote an email to a Openstack user, Jose Castro, for having an opinion about my problem with pfSense and he found a solution.
You must add allowed_address_pairs to LAN pfsense port and everythingis working:
neutron port-update <LAN_pfsense_uuid> --allowed-address-pairs type=dict list=true mac_address=<MAC_LAN_pfsense>,ip_address=0.0.0.0/0
With this port extension, neutron create a iptables rule that allow packets to LAN pfsense from any IP and everything is working.
Very thanks to Jose for solution of the problem