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: 2019-Feb-12
Document File: 19 page(s) / 27K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Braden: AUTHOR [+2]

Related Documents

10.17487/RFC1620: DOI

Abstract

This memo discusses alternative approaches to extending the Internet architecture to eliminate some or all unnecessary hops. 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 8% 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

Braden, Postel & Rekhter [Page 1]

RFC 1620 Shared Media IP Architecture May 1994

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#). Here "net#" is a unique IP number assigned to the network (or subnet) to which the host is attached, and "host#" identifies the host on that network (or subnet).

The original Internet model made the implicit assumptions that each network has a single IP network number and that networks with different numbers may interchange packets only through routers. These assumptions may be violated for networks...

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