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A DNS RR Type for Lists of Address Prefixes (APL RR) (RFC3123)

IP.com Disclosure Number: IPCOM000005309D
Original Publication Date: 2001-Jun-01
Included in the Prior Art Database: 2005-May-18
Document File: 9 page(s) / 15K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

P. Koch: AUTHOR

Abstract

The Domain Name System (DNS) is primarily used to translate domain names into IPv4 addresses using A RRs (Resource Records). Several approaches exist to describe networks or address ranges. This document specifies a new DNS RR type "APL" for address prefix lists.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 18% of the total text.

Network Working Group                                            P. Koch
Request for Comments: 3123                        Universitaet Bielefeld
Category: Experimental                                         June 2001


          A DNS RR Type for Lists of Address Prefixes (APL RR)

Status of this Memo

   This memo defines an Experimental Protocol for the Internet
   community.  It does not specify an Internet standard of any kind.
   Discussion and suggestions for improvement are requested.
   Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2001).  All Rights Reserved.

Abstract

   The Domain Name System (DNS) is primarily used to translate domain
   names into IPv4 addresses using A RRs (Resource Records).  Several
   approaches exist to describe networks or address ranges.  This
   document specifies a new DNS RR type "APL" for address prefix lists.

1. Conventions used in this document

   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 [RFC2119].

   Domain names herein are for explanatory purposes only and should not
   be expected to lead to useful information in real life [RFC2606].

2. Background

   The Domain Name System [RFC1034], [RFC1035] provides a mechanism to
   associate addresses and other Internet infrastructure elements with
   hierarchically built domain names.  Various types of resource records
   have been defined, especially those for IPv4 and IPv6 [RFC2874]
   addresses.  In [RFC1101] a method is described to publish information
   about the address space allocated to an organisation.  In older BIND
   versions, a weak form of controlling access to zone data was
   implemented using TXT RRs describing address ranges.

   This document specifies a new RR type for address prefix lists.

Koch                          Experimental                      [Page 1]
RFC 3123                       DNS APL RR                      June 2001


3. APL RR Type

   An APL record has the DNS type of "APL" and a numeric value of 42
   [IANA].  The APL RR is defined in the IN class only.  APL RRs cause
   no additional section processing.

4. APL RDATA format

   The RDATA section consists of zero or more items (<apitem>) of the
   form

      +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
      |                          ADDRESSFAMILY                        |
      +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
      |             PREFIX            | N |         AFDL...