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Observations on the use of Components of the Class A Address Space within the Internet (RFC2036)

IP.com Disclosure Number: IPCOM000002590D
Original Publication Date: 1996-Oct-01
Included in the Prior Art Database: 2019-Feb-16
Document File: 9 page(s) / 12K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Huston: AUTHOR

Related Documents

10.17487/RFC2036: DOI

Abstract

This document is a commentary on the recommendation that IANA commence allocation of the presently unallocated components of the Class A address space to registries, for deployment within the Internet as class-less address blocks. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 16% of the total text.

Network Working Group G. Huston Request for Comments: 2036 Telstra Internet Category: Informational October 1996

Observations on the use of Components of the Class A Address Space within the Internet

Status of this Memo

This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind. Distribution of this memo is unlimited.

Abstract

This document is a commentary on the recommendation that IANA commence allocation of the presently unallocated components of the Class A address space to registries, for deployment within the Internet as class-less address blocks.

The document examines the implications for service providers and end clients within this environment. The document notes the major conclusion that widespread adoption of class-less routing protocols is required, within a relatively rapid timeframe for this recommendation to be effective.

Introduction

The Address Lifetime Expectancy (ALE) Working Group of the IETF has recorded the allocation of Internet addresses from the unallocated address pool. ALE has noted that the existing practice of drawing addresses from the Class C space (192/3 address prefix) will result in near to medium term exhaustion of this section of the unallocated address pool. The largest remaining pool is in the Class A space, where some 25% of Internet addresses (the upper half of the Class A space) remain, to date, unallocated.

This document is a commentary on the potential recommendation that the Internet Assigned Numbers Authority (IANA), through delegated registries, commence allocation of the presently unallocated components of the Class A address space to registries, for deployment within the Internet through the mechanism of allocation of class-less address prefixes.

The deployment of class-less address prefixes from the Class A space within the Internet will require some changes to the routing structure within Internet component network domains. The motivation

Huston Informational [Page 1]

RFC 2036 Components of the Class A Address Space October 1996

for, and nature of, such changes as they effect network domains and network service providers are outlined in this document.

Current Practice with Address Allocations

To date the allocation of class-less network prefixed address blocks has followed a conservative practice of using address allocations which are compatible superblocks of Class C addresses, while the allocation of addresses within the space of Class A and Class B networks has continued to be aligned with the class-based prefix structure.

Within this address allocation environment for non-transit network domains there is accordingly the option to continue to use address deployment strategies which involve fixed subnet address structures within contiguous areas, and use Class-full interior routing protocols. In the situation where variable length subnet masks or disconnected subnets are deployed within the network domain’s routing structure, interi...

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