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IPv4 Address Behaviour Today (RFC2101)

IP.com Disclosure Number: IPCOM000002655D
Original Publication Date: 1997-Feb-01
Included in the Prior Art Database: 2019-Feb-15
Document File: 13 page(s) / 19K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Carpenter: AUTHOR [+2]

Related Documents

10.17487/RFC2101: DOI

Abstract

The main purpose of this note is to clarify the current interpretation of the 32-bit IP version 4 address space, whose significance has changed substantially since it was originally defined. 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 11% of the total text.

Network Working Group B. Carpenter Request for Comments: 2101 J. Crowcroft Category: Informational Y. Rekhter IAB February 1997

IPv4 Address Behaviour Today

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

The main purpose of this note is to clarify the current interpretation of the 32-bit IP version 4 address space, whose significance has changed substantially since it was originally defined. A short section on IPv6 addresses mentions the main points of similarity with, and difference from, IPv4.

Table of Contents

1. Introduction.................................................1 2. Terminology..................................................2 3. Ideal properties.............................................3 4. Overview of the current situation of IPv4 addresses..........4 4.1. Addresses are no longer globally unique locators.........4 4.2. Addresses are no longer all temporally unique............6 4.3. Multicast and Anycast....................................7 4.4. Summary..................................................8 5. IPv6 Considerations..........................................8 ANNEX: Current Practices for IPv4 Address Allocation & Routing..9 Security Considerations........................................10 Acknowledgements...............................................11 References.....................................................11 Authors’ Addresses.............................................13

1. Introduction

The main purpose of this note is to clarify the current interpretation of the 32-bit IP version 4 address space, whose significance has changed substantially since it was originally defined in 1981 [RFC 791].

Carpenter, et. al. Informational [Page 1]

RFC 2101 IPv4 Address Behavior Today February 1997

This clarification is intended to assist protocol designers, product implementors, Internet service providers, and user sites. It aims to avoid misunderstandings about IP addresses that can result from the substantial changes that have taken place in the last few years, as a result of the Internet’s exponential growth.

A short section on IPv6 addresses mentions the main points of similarity with, and difference from, IPv4.

2. Terminology

It is well understood that in computer networks, the concepts of directories, names, network addresses, and routes are separate and must be analysed separately [RFC 1498]. However, it is also necessary to sub-divide the concept of "network address" (abbreviated to "address" from here on) into at least two notions, namely "identifier" and "locator". This was perhaps less well understood when RFC 791 was written.

In this document, the term "host" refers to any system originating and/or terminating IPv4 packets, and "router" refers to any system forwarding IPv4 packets from one host or router to another.

For the purposes of this document, an "identifier"...

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