Open Questions in Path Aware Networking
draft-trammell-panrg-questions-00

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Path Aware Networking RG                                     B. Trammell
Internet-Draft                                                ETH Zurich
Intended status: Informational                          October 24, 2017
Expires: April 27, 2018

                Open Questions in Path Aware Networking
                   draft-trammell-panrg-questions-00

Abstract

   write me

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on April 27, 2018.

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Table of Contents

   1.  Introduction to Path-Aware Networking . . . . . . . . . . . .   2
   2.  Questions . . . . . . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  A Vocabulary of Path Properties . . . . . . . . . . . . .   2
     2.2.  Discovery, Distribution, and Trustworthiness of Path
           Properties  . . . . . . . . . . . . . . . . . . . . . . .   3
     2.3.  Supporting Path Selection . . . . . . . . . . . . . . . .   4
     2.4.  Interfaces for Path Awareness . . . . . . . . . . . . . .   4
     2.5.  Operating a Path Aware Network  . . . . . . . . . . . . .   4
   3.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction to Path-Aware Networking

   In the current Internet architecture, the network layer provides an
   unverifiable, best-effort service: an application can assume that a
   packet with a given destination address will eventually be forwarded
   toward that destination, but little else.  A transport layer protocol
   such as TCP can provide reliability over this best-effort service,
   and a protocol above the network layer such as IPsec AH [RFC4302] or
   TLS [RFC5246] can authenticate the remote endpoint.  However, no
   explicit information about the path is available, and assumptions
   about that path sometimes do not hold, sometimes with serious impacts
   on the application, as in the case with BGP hijacking attacks.

   By contrast, in a path-aware networking architecture, endpoints have
   the ability to select or influence the path through the network used
   by any given packet, and the network layer explicitly exposes
   information about the path or paths available between two endpoints
   to those endpoints so that they can make this selection.  Path
   control at the packet level enables new transport protocols that can
   leverage multipath connectivity even over a single interface.

2.  Questions

   Realizing path-aware networking requires answers to a set of open
   research questions.  This document poses these questions, as a
   starting point for discussions about how to realize path awareness in
   the Internet, and to direct future research efforts within the Path
   Aware Networking Research Group.

2.1.  A Vocabulary of Path Properties

   In order for information about paths to be exposed to the endpoints,
   and for those endpoints to be able to use that information, it is
   necessary to define a common vocabulary for path properties.  The

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   elements of this vocabulary could include relatively static
   properties, such as the presence of a given node on the path; as well
   as relatively dynamic properties, such as the current values of
   metrics such as loss and latency.

   This vocabulary must be defined carefully, as its design will have
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