rfc1916.txt

著名的RFC文档,其中有一些文档是已经翻译成中文的的.

Network Working Group                                       H. Berkowitz
Request for Comments: 1916                             PSC International
Category: Informational                                      P. Ferguson
                                                     cisco Systems, Inc.
                                                               W. Leland
                                                                Bellcore
                                                               P. Nesser
                                              Nesser & Nesser Consulting
                                                           February 1996


    Enterprise Renumbering: Experience and Information Solicitation

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

   Because of the urgent need for, and substantial difficulty in,
   renumbering IP networks, the PIER working group is compiling a series
   of documents to assist sites in their renumbering efforts.  The
   intent of these documents is to provide both educational and
   practical information to the Internet community. To this end the
   working group is soliciting information from organizations that
   already have gone through, or are in the process of going through,
   renumbering efforts. Case studies, tools, and lists of applications
   that require special attention are sought.

Table of Contents

   1.   Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
   2.   Renumbering Experience . . . . . . . . . . . . . . . . . . . 4
   3.   Information on Tools . . . . . . . . . . . . . . . . . . . . 5
   4.   Application Information  . . . . . . . . . . . . . . . . . . 6
   5.   Security Considerations  . . . . . . . . . . . . . . . . . . 6
   6.   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . 7
   A.   Formatting Rules (from RFC 1543) . . . . . . . . . . . . . . 8











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RFC 1916          Enterprise Renumbering Solicitation      February 1996


1. Introduction

   There are immediate and increasingly severe requirements to renumber
   both small and large-scale networks. The Procedures for
   Internet/Enterprise Renumbering (PIER) working group in the IETF
   urgently requests specific input for producing concrete guidance for
   the renumbering task as quickly as possible.  As part of collecting
   such information, the PIER working group therefore is soliciting
   input from people and organizations with experience in changing the
   IP addresses of enterprise networks or in making major changes in the
   subnetting of existing networks. We are especially interested in
   actual case studies -- that is, accounts describing what was actually
   done to renumber one or more networks.  Information is also solicited
   on specific tools used in the process, and on areas in which tools
   were needed but not available.  Because applications that use IP
   addresses directly in their configuration or security mechanisms pose
   specific difficulties and coordination issues for renumbering, a
   catalogue of such applications is being compiled.

   All interested parties are invited to submit material in any of these
   areas:

   A) Accounts of the experience of renumbering networks:
   -- Retrospective reports on renumbering efforts.
   -- Journals or running accounts of a renumbering effort, written
      while the task is underway.

   B) Information on tools to help renumbering:
   -- Descriptions of tools used, whether commercial, freeware, or ad
      hoc (such as perl scripts).
   -- Descriptions of specific needs where a tool could clearly have
      helped, but none was found.

   C) Information on applications using embedded IP addresses:
   -- Software applications that use embedded IP addresses for security
      keys, authentication, or any other "inappropriate" purposes.
   -- Hardware devices whose IP addresses are hardcoded into the
      hardware design (and so may require extensive time lags to
      retool).
   -- Both software and hardware whose vendors are no longer in business
      and that may require replacement or specialized solutions.

   The focus of this solicitation is on experience with renumbering that
   has been done or is now underway in IPv4 networks, and not on future
   changes to protocols or environments that may eventually be useful.
   We are especially concerned with the most common situation faced
   today: single-homed networks that are not transit providers. However,
   experience with renumbering more complex environments is also



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RFC 1916          Enterprise Renumbering Solicitation      February 1996


   welcome.

   The information provided will be used as an information base from
   which at least three documents will be composed: a document
   summarizing the processes to follow when renumbering, a document
   describing the available tools, and a document containing a list of
   known applications requiring special attention when renumbering. The
   information will also be available on the PIER home page,
   http://www.isi.edu/div7/pier. More specific reports on renumbering
   particular environments may also be produced in those cases where
   enough information is received from the community.

   Although our emphasis is on technical issues and responses, solidly
   based advice on smoothing the human problems is also appreciated.
   Political and cultural sensitivities, and handling them, are major
   issues in the real world.

   There is no requirement that a formal document be submitted, although
   with the permission of the submitter, selected accounts of experience
   in renumbering will be published by PIER as part of their planned
   series of case studies. If you wish to have your account released as
   a PIER case study, please follow the standard RFC format described in
   RFC 1543, "Instructions to RFC Authors". (For convenience, these
   formatting rules are given in Appendix A below.)

   The people and organization(s) involved and the network(s) renumbered
   need not be identified in any document made public by PIER: please
   explicitly indicate if a submission should have its anonymity
   protected.

   The deadline for the submission of your information is May 15, 1996,
   though early submission is encouraged. Any information, however
   informally written, that can be submitted earlier, would be greatly
   appreciated and will help shape the further work of the PIER group.
   In particular, if you expect to submit a detailed write-up by May 15,
   1996, please let us know as soon as possible.

   Please send submissions, questions, or suggestions to the PIER
   discussion list, [e-mail].

   To subscribe to the PIER discussion list, please send your request to
   [e-mail]. Further information on PIER is available on the
   PIER home page, http://www.isi.edu/div7/pier.

   Mail may also be sent directly to the editors, without its appearing
   on the PIER list, by sending to [e-mail].





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RFC 1916          Enterprise Renumbering Solicitation      February 1996


2.  Renumbering Experience

   An account of a renumbering effort should provide enough concrete
   information, based on actual experience, so that the reader can
   understand exactly what was done. Broadly speaking, we anticipate two
   styles of account:

   i) Retrospective reports

      Based on one or more renumbering efforts, recapitulate what was
      done and what was learned in the effort. Such a report should
      describe:
      -- The environment being renumbered.
      -- The planning undertaken.
      -- What was done.
      -- What worked.
      -- What didn't (unanticipated issues, problems with planned
         approaches).

      In addition, the report would be even more useful if it also
      addressed:
      -- The reasons for taking the approach chosen.
      -- Any alternative approaches that were rejected, and why.
      -- What could have been done in advance to make the task easier.
      -- Lessons learned: how would you do it next time?

      It is hoped that individuals and organizations that have already
      been through a renumbering effort could quickly look back over
      their experiences, and capture their knowledge.

   ii) Running accounts

      Many people are in the midst of a renumbering effort, or are about
      to embark on one in the next few months. If, in the midst of that
      hectic task, one could write down a brief account or "diary" of
      what actually happens, as it happens, such a report is likely to
      capture the glitches and fixes of even the best-planned effort
      more accurately than any retrospective.

   Of course, these are only rough categories: any record of the
   experience of renumbering or of information gained by such experience
   can be a valuable contribution to PIER. When submitting accounts of
   renumbering efforts, please attempt to be as articulate and concise
   as possible.







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