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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: 2000-Sep-13
Document File: 7 page(s) / 19K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Huston: AUTHOR

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 text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 15% 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

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 v...