IPng Requirements of Large Corporate Networks
RFC 1678

Document Type RFC - Informational (August 1994; No errata)
Last updated 2013-03-02
Stream Legacy
Formats plain text html pdf htmlized bibtex
Stream Legacy state (None)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state RFC 1678 (Informational)
Telechat date
Responsible AD (None)
Send notices to (None)
Network Working Group                                         E. Britton
Request for Comments: 1678                                       J. Tavs
Category: Informational                                              IBM
                                                             August 1994

             IPng Requirements of Large Corporate Networks

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.


   This document was submitted to the IETF IPng area in response to RFC
   1550.  Publication of this document does not imply acceptance by the
   IPng area of any ideas expressed within.  Comments should be
   submitted to the big-internet@munnari.oz.au mailing list.  This draft
   summarizes some of the requirements of large corporate networks for
   the next generation of the Internet protcol suite.

Executive Overview

   As more and more corporations are using TCP/IP for their mission-
   critical applications, they are bringing additional requirements,
   summarized below, the satisfaction of which would make TCP/IP even
   more appealing to businesses.  Since these are requirements rather
   than solutions, we include capabilities that might be provided in
   protocol layers other than the one that IPv4 occupies; i.e., these
   items might lie outside the scope typically envisioned for IPng, but
   we'll refer to them as IPng requirements nonetheless.  When we
   mention potential solutions, it is not to suggest that they are the
   best approach, but merely to clarify the requirement.

   Among business users the major requirements we see for IPng are:

      -- smooth migration from, and coexistence with, IPv4;
      -- predictable levels of service for predictable costs;
      -- security; and
      -- accommodation of multiple protocols suites.

   We also mention several more specific requirements.

   IPng must have a viable strategy for migration from, and coexistence
   with, IPv4.  IPv4 and IPng must coexist well, because they will need
   to do so for several years.  To encourage IPv4 users to upgrade to

Britton & Tavs                                                  [Page 1]
RFC 1678     IPng Requirements of Large Corporate Networks   August 1994

   IPng, IPng must offer compelling advantages and an easy migration

   Corporate networks must meet promised levels of service while
   controlling costs through efficient use of resources.  The IETF
   should consider both technical solutions (such as service classes and
   priorities) and administrative ones (such as accounting) to promote

   Many businesses will not connect to a network until they are
   confident that it will not significantly threaten the
   confidentiality, integrity, or availability of their data.

   Corporations tend to use multiple protocols.  Numerous forces stymie
   the desire to settle on just one protocol for a large corporation:
   diverse installed bases, skills, technical factors, and the general
   trend toward corporate decentralization.  The IETF needs a strategy
   for heterogeneity flexible enough to accommodate the principal
   multiprotocol techniques, including multiprotocol transport,
   tunneling, and link sharing.

   Some of these requirements might be satisfied by more extensive
   deployment of existing Internet architectures (e.g., Generic Security
   Service and IPv4 type of service).  The current Internet protocols
   could be enhanced to satisfy most of the remaining requirements of
   commercial users while retaining IPv4.  Nevertheless, some
   corporations will be scared away from TCP/IP by the publicity about
   the address space until the IETF sets a direction for its expansion.

Migration and Coexistence

   As the use of IPv4 continues to grow, the day may come when no more
   IPv4 network addresses will be left, and no additional networks will
   be able to connect to the Internet.  Classless Inter-Domain Routing
   (CIDR, RFC 1519) and careful gleaning of the address space will
   postpone that cutoff for several years.  The hundreds of millions of
   people on networks that do get IPv4 addresses won't be affected
   directly by the exhaustion of the address space, but they will miss
   the opportunity to communicate with those less lucky.

   Because the Internet is too large for all its users to cutover to
   IPng quickly, IPng must coexist well with IPv4.  Furthermore, IPv4
   users won't upgrade to IPng without a compelling reason.  Access to
   new services will not be a strong motivation, since new services will
   want to support both the IPng users and the IPv4 users.  Only
   services that cannot exist on IPv4 will be willing to use IPng
   exclusively.  Moreover, if IPng requires more resources (e.g.,
   storage, memory, or administrative complexity) than IPv4, users will

Britton & Tavs                                                  [Page 2]
Show full document text