Browse Prior Art Database

Internet Architecture Extensions for Shared Media (RFC1620)

IP.com Disclosure Number: IPCOM000002455D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 16 page(s) / 42K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Braden: AUTHOR [+3]

Abstract

The original Internet architecture assumed that each network is labeled with a single IP network number. This assumption may be violated for shared media, including "large public data networks" (LPDNs). The architecture still works if this assumption is violated, but it does not have a means to prevent multiple host- router and router-router hops through the shared medium. This memo discusses alternative approaches to extending the Internet architecture to eliminate some or all unnecessary hops.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 7% of the total text.

Network Working Group B. Braden

Request for Comments: 1620 ISI

Category: Informational J. Postel

ISI

Y. Rekhter

IBM Research

May 1994

Internet Architecture Extensions for Shared Media

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 original Internet architecture assumed that each network is

labeled with a single IP network number. This assumption may be

violated for shared media, including "large public data networks"

(LPDNs). The architecture still works if this assumption is

violated, but it does not have a means to prevent multiple host-

router and router-router hops through the shared medium. This memo

discusses alternative approaches to extending the Internet

architecture to eliminate some or all unnecessary hops.

Table of Contents

1. INTRODUCTION .................................................. 2

2. THE ORIGINAL INTERNET ARCHITECTURE ............................ 2

3. THE PROBLEMS INTRODUCED BY SHARED MEDIA ....................... 4

4. SOME SOLUTIONS TO THE SM PROBLEMS ............................. 7

4.1 Hop-by-Hop Redirection ................................... 7

4.2 Extended Routing ......................................... 11

4.3 Extended Proxy ARP ....................................... 13

4.4 Routing Query Messages ................................... 14

4.5 Stale Routing Information ................................ 14

4.6 Implications of Filtering (Firewalls) .................... 15

5. SECURITY CONSIDERATIONS ....................................... 16

6. CONCLUSIONS ................................................... 17

7. ACKNOWLEDGMENTS ............................................... 17

8. REFERENCES .................................................... 18

Authors' Addresses ............................................... 19

1. INTRODUCTION

This memo concerns the implications of shared medium networks for the

architecture of the TCP/IP protocol suite. General familiarity with

the TCP/IP architecture and the IP protocol is assumed.

The Internet architecture is founded upon what was originally called

the "Catenet model" [PSC81]. Under this model, the Internet

(originally dubbed "the Catenet") is formed using routers (originally

called "gateways") to interconnect distinct and perhaps diverse

networks. An IP host address (more correctly characterized as a

network interface address) is formed of the pair (net#,host#). He...