Current Open Questions in Path Aware Networking
draft-irtf-panrg-questions-03

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Last updated 2019-10-15
Replaces draft-trammell-panrg-questions
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Path Aware Networking RG                                     B. Trammell
Internet-Draft                                                    Google
Intended status: Informational                          October 15, 2019
Expires: April 17, 2020

            Current Open Questions in Path Aware Networking
                     draft-irtf-panrg-questions-03

Abstract

   In contrast to the present Internet architecture, a path-aware
   internetworking architecture has two important properties: it exposes
   the properties of available Internet paths to endpoints, and provides
   for endpoints and applications to use these properties to select
   paths through the Internet for their traffic.  This document poses
   questions in path-aware networking open as of 2019, that must be
   answered in the design, development, and deployment of path-aware
   intetnetworks.  It was originally written to frame discussions in the
   Path Aware Networking proposed Research Group (PANRG), and has been
   published to snapshot current thinking in this space.

Status of This Memo

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Trammell                 Expires April 17, 2020                 [Page 1]
Internet-Draft                PAN questions                 October 2019

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Table of Contents

   1.  Introduction to Path-Aware Networking . . . . . . . . . . . .   2
   2.  Questions . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  A Vocabulary of Path Properties . . . . . . . . . . . . .   3
     2.2.  Discovery, Distribution, and Trustworthiness of Path
           Properties  . . . . . . . . . . . . . . . . . . . . . . .   4
     2.3.  Supporting Path Selection . . . . . . . . . . . . . . . .   4
     2.4.  Interfaces for Path Awareness . . . . . . . . . . . . . .   4
     2.5.  Implications of Path Awareness for the Data Plane . . . .   5
     2.6.  What is an Endpoint?  . . . . . . . . . . . . . . . . . .   5
     2.7.  Operating a Path Aware Network  . . . . . . . . . . . . .   6
     2.8.  Deploying a Path Aware Network  . . . . . . . . . . . . .   6
   3.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   7
   4.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     4.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction to Path-Aware Networking

   In the current Internet architecture, the interdomain 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 internetworking architecture, endpoints
   have the ability to select or influence the path through the network
   used by any given packet, and the network and transport layers
   explicitly expose information about the path or paths available
   between two endpoints to those endpoints and the applications running
   on them, so that they can make this selection.

   Path selection provides transparency and control to applications and
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