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Application-Layer Traffic Optimization (ALTO) Server Discovery
RFC 7286

Document type: RFC - Proposed Standard (November 2014; No errata)
Document stream: IETF
Last updated: 2014-11-14
Other versions: plain text, pdf, html

IETF State: Submitted to IESG for Publication
Consensus: Yes
Document shepherd: Vijay Gurbani
Shepherd Write-Up: Last changed 2013-08-22

IESG State: RFC 7286 (Proposed Standard)
IANA Action State: RFC-Ed-Ack
Responsible AD: Spencer Dawkins
Send notices to: alto-chairs@tools.ietf.org, draft-ietf-alto-server-discovery@tools.ietf.org

Internet Engineering Task Force (IETF)                         S. Kiesel
Request for Comments: 7286                       University of Stuttgart
Category: Standards Track                                 M. Stiemerling
ISSN: 2070-1721                                          NEC Europe Ltd.
                                                               N. Schwan
                                                      Thales Deutschland
                                                               M. Scharf
                                                Alcatel-Lucent Bell Labs
                                                                 H. Song
                                                                  Huawei
                                                           November 2014

     Application-Layer Traffic Optimization (ALTO) Server Discovery

Abstract

   The goal of Application-Layer Traffic Optimization (ALTO) is to
   provide guidance to applications that have to select one or several
   hosts from a set of candidates capable of providing a desired
   resource.  ALTO is realized by a client-server protocol.  Before an
   ALTO client can ask for guidance, it needs to discover one or more
   ALTO servers.

   This document specifies a procedure for resource-consumer-initiated
   ALTO server discovery, which can be used if the ALTO client is
   embedded in the resource consumer.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in 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/rfc7286.

Kiesel, et al.               Standards Track                    [Page 1]
RFC 7286                  ALTO Server Discovery            November 2014

Copyright Notice

   Copyright (c) 2014 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.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology and Requirements Language . . . . . . . . . .   3
   2.  ALTO Server Discovery Procedure Overview  . . . . . . . . . .   3
   3.  ALTO Server Discovery Procedure Specification . . . . . . . .   4
     3.1.  Step 1: Retrieving the Domain Name  . . . . . . . . . . .   5
       3.1.1.  Step 1, Option 1: Local Configuration . . . . . . . .   5
       3.1.2.  Step 1, Option 2: DHCP  . . . . . . . . . . . . . . .   5
     3.2.  Step 2: U-NAPTR Resolution  . . . . . . . . . . . . . . .   6
   4.  Deployment Considerations . . . . . . . . . . . . . . . . . .   7
     4.1.  Issues with Home Gateways . . . . . . . . . . . . . . . .   7
     4.2.  Issues with Multihoming, Mobility, and Changing IP
           Addresses . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
     6.1.  Integrity of the ALTO Server's URI  . . . . . . . . . . .   9
     6.2.  Availability of the ALTO Server Discovery Procedure . . .  11
     6.3.  Confidentiality of the ALTO Server's URI  . . . . . . . .  11
     6.4.  Privacy for ALTO Clients  . . . . . . . . . . . . . . . .  12
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Acknowledgments   . . . . . . . . . . . . . . . . . . . . . . . .  14
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

Kiesel, et al.               Standards Track                    [Page 2]
RFC 7286                  ALTO Server Discovery            November 2014

1.  Introduction

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