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Resolution of Uniform Resource Identifiers using the Domain Name System (RFC2168)

IP.com Disclosure Number: IPCOM000002725D
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 16 page(s) / 43K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Danie1: AUTHOR [+1]


Status of this Memo ===================

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 6% of the total text.

Network Working Group R. Daniel

Request for Comments: 2168 Los Alamos National Laboratory

Category: Experimental M. Mealling

Network Solutions, Inc.

June 1997

Resolution of Uniform Resource Identifiers

using the Domain Name System

Status of this Memo


This memo defines an Experimental Protocol for the Internet

community. This memo does not specify an Internet standard of any

kind. Discussion and suggestions for improvement are requested.

Distribution of this memo is unlimited.



Uniform Resource Locators (URLs) are the foundation of the World Wide

Web, and are a vital Internet technology. However, they have proven

to be brittle in practice. The basic problem is that URLs typically

identify a particular path to a file on a particular host. There is

no graceful way of changing the path or host once the URL has been

assigned. Neither is there a graceful way of replicating the resource

located by the URL to achieve better network utilization and/or fault

tolerance. Uniform Resource Names (URNs) have been hypothesized as a

adjunct to URLs that would overcome such problems. URNs and URLs are

both instances of a broader class of identifiers known as Uniform

Resource Identifiers (URIs).

The requirements document for URN resolution systems[15] defines the

concept of a "resolver discovery service". This document describes

the first, experimental, RDS. It is implemented by a new DNS Resource

Record, NAPTR (Naming Authority PoinTeR), that provides rules for

mapping parts of URIs to domain names. By changing the mapping

rules, we can change the host that is contacted to resolve a URI.

This will allow a more graceful handling of URLs over long time

periods, and forms the foundation for a new proposal for Uniform

Resource Names.

In addition to locating resolvers, the NAPTR provides for other

naming systems to be grandfathered into the URN world, provides

independence between the name assignment system and the resolution

protocol system, and allows multiple services (Name to Location, Name

to Description, Name to Resource, ...) to be offered. In conjunction

with the SRV RR, the NAPTR record allows those services to be

replicated for the purposes of fault tolerance and load balancing.



Uniform Resource Locators have been a significant advance in

retrieving Internet-access...