DL> Port/Overload NAT for IPv4 (NAT:P) has security benefits 
  > in that it requires explicit configuration to allow for 
  > inbound unsolicited transport connections (via port forwarding)
  > to 'inside' hosts.

Perhaps you missed this statement from
<http://www.ietf.org/internet-drafts/draft-mrw-behave-nat66-01.txt>

   NAT66 devices that comply with
   this specification MUST NOT perform port mapping.

--Michael Dillon
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