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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