Using PCP to Reveal a Host behind NAT

Document Type Expired Internet-Draft (individual)
Authors Mohamed Boucadair  , Tirumaleswar Reddy.K  , Prashanth Patil  , Dan Wing 
Last updated 2013-11-29 (latest revision 2013-05-28)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes how to use PCP to retrieve the identity of a host behind a NAT. Two use cases are discussed and the PCP applicability is analyzed. This document extends PCP with a new OpCode called QUERY Opcode. The proposed mechanism is valid for all NAT flavors including NAT44, NAT64 or NPTv6.


Mohamed Boucadair (
Tirumaleswar Reddy.K (
Prashanth Patil (
Dan Wing (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)