ALTO S. Kiesel
Internet-Draft University of Stuttgart
Intended status: Standards Track M. Stiemerling
Expires: September 22, 2013 NEC Europe Ltd.
N. Schwan
Stuttgart, Germany
M. Scharf
Alcatel-Lucent Bell Labs
H. Song
Huawei
March 21, 2013
ALTO Server Discovery
draft-ietf-alto-server-discovery-08
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 that can provide suitable guidance.
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.
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Terminology and Requirements Language
This document makes use of the ALTO terminology defined in [RFC5693].
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 22, 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. 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.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. ALTO Server Discovery Procedure Overview . . . . . . . . . . . 5
3. ALTO Server Discovery Procedure Specification . . . . . . . . 6
3.1. Step 1: Retrieving the Domain Name . . . . . . . . . . . . 6
3.1.1. Step 1, Option 1: User input . . . . . . . . . . . . . 6
3.1.2. Step 1, Option 2: DHCP . . . . . . . . . . . . . . . . 6
3.2. Step 2: U-NAPTR Resolution . . . . . . . . . . . . . . . . 7
4. Deployment Considerations . . . . . . . . . . . . . . . . . . 8
4.1. Issues with Home Gateways . . . . . . . . . . . . . . . . 8
4.2. Issues with Multihoming, Mobility and Changing IP
Addresses . . . . . . . . . . . . . . . . . . . . . . . . 8
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
6. Security Considerations . . . . . . . . . . . . . . . . . . . 11
6.1. General Security Considerations . . . . . . . . . . . . . 11
6.2. Security Considerations for U-NAPTR . . . . . . . . . . . 11
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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