Discovering the Capabilities of Flow-Aware Service Functions (a.k.a. Middleboxes): A PCP-based Approach

Document Type Expired Internet-Draft (individual)
Authors Mohamed Boucadair  , Christian Jacquenet 
Last updated 2016-01-01 (latest revision 2015-06-30)
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This document specifies a solution to discover the capabilities of a flow-aware service function. The solution relies upon the use of the Port Control Protocol (PCP). This solution allows for applications to anticipate connectivity failures and to proceed with countermeasures (e.g., create a mapping for incoming connections, discover a mapping lifetime, discover an external IP address, avoid injecting some options in the outgoing packets, etc.). The propsoed approach allows, for example, to discover whether an upstream flow-aware service function is MPTCP- friendly (that is, it does not strip MPTCP signals) or SCTP- compliant, whether it embeds a firewall function, etc. or a combination thereof.


Mohamed Boucadair (
Christian Jacquenet (

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