The P2P Network Experiment Council's Activities and Experiments with Application-Layer Traffic Optimization (ALTO) in Japan
RFC 6875

Document Type RFC - Informational (February 2013; No errata)
Last updated 2013-02-22
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Internet Research Task Force (IRTF)                             S. Kamei
Request for Comments: 6875                            NTT Communications
Category: Informational                                        T. Momose
ISSN: 2070-1721                                            Cisco Systems
                                                                T. Inoue
                                                            T. Nishitani
                                                      NTT Communications
                                                           February 2013

  The P2P Network Experiment Council's Activities and Experiments with
         Application-Layer Traffic Optimization (ALTO) in Japan

Abstract

   This document describes experiments that clarify how an approach
   similar to Application-Layer Traffic Optimization (ALTO) was
   effective in reducing network traffic.  These experiments were
   performed in Japan by the P2P Network Experiment Council in an
   attempt to harmonize peer-to-peer (P2P) technology with network
   infrastructure.  Based on what was learned from these experiments,
   this document provides some suggestions that might be useful for the
   ALTO architecture and especially for application-independent ALTO-
   like server operation.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Research Task Force
   (IRTF).  The IRTF publishes the results of Internet-related research
   and development activities.  These results might not be suitable for
   deployment.  This RFC represents the individual opinion(s) of one or
   more members of the Peer-to-Peer Research Group of the Internet
   Research Task Force (IRTF).  Documents approved for publication by
   the IRSG are not a candidate for any level of Internet Standard; see
   Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6875.

Kamei, et al.                 Informational                     [Page 1]
RFC 6875                P2P Experiments in Japan           February 2013

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Background in Japan  . . . . . . . . . . . . . . . . . . . . .  4
     2.1.  P2P Traffic  . . . . . . . . . . . . . . . . . . . . . . .  4
     2.2.  Impact on Network Infrastructure . . . . . . . . . . . . .  4
     2.3.  Overview of the P2P Network Experiment Council . . . . . .  5
   3.  Objectives of the P2P Network Experiment Council . . . . . . .  6
   4.  Details of the Experiment  . . . . . . . . . . . . . . . . . .  7
     4.1.  Dummy Node . . . . . . . . . . . . . . . . . . . . . . . .  7
   5.  Hint Servers . . . . . . . . . . . . . . . . . . . . . . . . .  9
   6.  High-Level Trial Results . . . . . . . . . . . . . . . . . . . 13
     6.1.  Peer Selection with P2P  . . . . . . . . . . . . . . . . . 13
     6.2.  Peer Selection with the Hint Server  . . . . . . . . . . . 13
   7.  Considerations . . . . . . . . . . . . . . . . . . . . . . . . 14
     7.1.  Next Steps . . . . . . . . . . . . . . . . . . . . . . . . 14
     7.2.  Feedback to the ALTO WG  . . . . . . . . . . . . . . . . . 15
       7.2.1.  Hierarchical Architecture for ALTO Servers . . . . . . 15
       7.2.2.  Measurement Mechanism  . . . . . . . . . . . . . . . . 15
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 16
   9.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 16
   10. Informative References . . . . . . . . . . . . . . . . . . . . 16

Kamei, et al.                 Informational                     [Page 2]
RFC 6875                P2P Experiments in Japan           February 2013

1.  Introduction

   An overlay network, which is used by P2P and other applications,
   offers the advantage of allowing flexible provisioning of services
   while hiding the lower-layer network.  The disadvantage is that
   inefficient routing without considering the lower-layer network may
   cause increasing the network load.  Several proposals have been made
   to build an overlay network that takes into account the information
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