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Network Working Group                               Philip J. Nesser II
draft-ietf-v6ops-ipv4survey-intro-04.txt     Nesser & Nesser Consulting
Internet Draft                                        Andreas Bergstrom
                                             Ostfold University College
                                                         September 2003
                                                  Expires February 2004

           Introduction to the Survey of IPv4 Addresses in
                 Currently Deployed IETF Standards

This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.

Status of this Memo

Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups.  Note that other
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Internet-Drafts are draft documents valid for a maximum of six
months and may be updated, replaced, or obsoleted by other documents at
any time.  It is inappropriate to use Internet-Drafts as reference
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The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt

The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.


Abstract

This document is a general overview and introduction to the v6ops IETF
workgroup project of documenting all usage of IPv4 addresses in
currently deployed IETF documented standards.  It is broken into seven
documents conforming to the current IETF areas.  It also describes the
methodology used during documentation, which type of RFCs that has
been documented, and a concatenated summary of results.


Table of Contents

1. Introduction
   1.1 Short Historical Perspective
   1.2 An Observation on the Classification of Standards
2. Methodology
   2.1 Scope
3. Summary of Results
   3.1 Application Area Specifications
   3.2 Internet Area Specifications
   3.3 Operations & Management Area Specifications
   3.4 Routing Area Specifications
   3.5 Security Area Specifications
   3.6 Sub-IP Area Specifications
   3.7 Transport Area Specifications
4. Discussion of "Long Term" Stability of Addresses on Protocols
5. Security Consideration
6. Acknowledgements
7. References
7.1 Normative
8. Authors Addresses
9. Intellectual Property Statement
10. Full Copyright Statement


1.0 Introduction


This document is the introduction to a document set aiming to
document all usage of IPv4 addresses in IETF standards. In an effort to
have the information in a manageable form, it has been broken into 7
documents conforming to the current IETF areas (Application[1],
Internet[2], Management & Operations[3], Routing[4], Security[5],
Sub-IP[6] and Transport[7]).  It also describes the methodology used
during documentation, which type of RFCs that has been documented,
and a concatenated summary of results.



1.1 Short Historical Perspective

There are many challenges that face the Internet Engineering community.
The foremost of these challenges has been the scaling issue: how to
grow a network that was envisioned to handle thousands of hosts to one
that will handle tens of millions of networks with billions of hosts.
Over the years this scaling problem has been managed, with varying
degrees of succes, by changes to the network layer and to routing
protocols.  (Although largely ignored in the changes to network layer
and routing protocols, the tremendous advances in computational
hardware during the past two decades have been of significant benefit
in managment of scaling problems encountered thus far.)

The first "modern" transition to the network layer occurred in during
the early 1980's from the Network Control Protocol (NCP) to IPv4.  This
culminated in the famous "flag day" of January 1, 1983.  IP Version 4
originally specified an 8 bit network and 24 bit host addresses, as
documented in RFC 760.  A year later IPv4 was updated in RFC 791 to
include the famous A, B, C, D, & E class system.

Networks were growing in such a way that it was clear that a convention
for breaking networks into smaller pieces was needed.  In October of
1984 RFC 917 was published formalizing the practice of subnetting.

By the late 1980's it was clear that the current exterior routing
protocol used by the Internet (EGP) was insufficiently robudt to scale
with the growth of the Internet.  The first version of BGP was
documented in 1989 in RFC 1105.

Yet another scaling issue, exhaustion of the class B address space,
became apparent in the early 1990s.  The growth and commercialization
of the Internet stimulated organisations requesting IP addresses in
alarming numbers.  By May of 1992 over 45% of the Class B space had
been allocated.  In early 1993 RFC 1466 was published directing
assignment of blocks of Class C's be given out instead of Class B's.
This temporarily circumvented the problem of address space exhaustion,
but had significant impact of the routing infrastructure.

The number of entries in the "core" routing tables began to grow
exponentially as a result of RFC 1466.  This led to the implementation
of BGP4 and CIDR prefix addressing.  This may have circumvented the
problem for the present but there are still potential scaling issues.

Growth in the population of Internet hosts since the mid-1980s would
have long overwhelmed the IPv4 address space if industry had not
supplied a circumvention in the form of Network Address Translators
(NATs).  To do this the Internet has sacrificed the underlying
"End-to-End" principle.

In the early 1990's the IETF was aware of these potential problems and
began a long design process to create a successor to IPv4 that would
address these issues.  The outcome of that process was IPv6.

The purpose of this document is not to discuss the merits or problems of
IPv6.  That is a debate that is still ongoing and will eventually be
decided on how well the IETF defines transition mechanisms and how
industry accepts the solution.  The question is not "should," but
"when."


1.2 An Observation on the Classification of Standards

It has become clear during the course of this investigation that there
has been little management of the status of standards over the years.
Some attempt has been made by the introduction of the classification of
standards into Full, Draft, Proposed, Experimental, and Historic.
However, there has not been a concerted effort to actively manage the
classification for older standards.  Standards are only classified as
Historic when either a newer version of the protocol is deployed,
it is randomly noticed that an RFC describes a long dead protocol, or
a serious flaw is discovered in a protocol.  Another issue is the status
of Proposed Standards.  Since this is the entry level position for
protocols entering the standards process, many old protocols or non-
implemented protocols linger in this status indefinitely.  This problem
also exists for Experimental Standards.  Similarly the problem exists
for the Best Current Practices (BCP) and For You Information (FYI)
series of documents.

To exemplify this point, there are 61 Full Standards, only 4 of which
have been reclassified to Historic. There are 65 Draft Standards, 611
Proposed Standards, and 150 Experimental RFCs, of which only 66
have been reclassified as Historic.  That is a rate of less than 8%.
It should be obvious that in the more that 30 years of protocol
development and documentation there should be at least as many (if
not a majority of) protocols that have been retired compared to the ones
that are currently active.

Please note that there is occasionally some confusion of the meaning of
a "Historic" classification.  It does NOT necessarily mean that the
protocol is not being used.  A good example of this concept is the
Routing Information Protocol(RIP) version 1.  There are many thousands
of sites using this protocol even though it has Historic status.  There
are potentially hundreds of otherwise classified RFC's that should be
reclassified.


2.0 Methodology

To perform this study each class of IETF standards are investigated in
order of maturity:  Full, Draft, and Proposed, as well as Experimental.
Informational and BCP RFCs are not addressed.  RFCs that have been
obsoleted by either newer versions or as they have transitioned through
the standards process are not covered.  RFCs which have been classified
as Historic are also not included.

Please note that a side effect of this choice of methodology is that
some protocols that are defined by a series of RFC's that are of
different levels of standards maturity are covered in different spots
in the document.  Likewise other natural groupings (i.e. MIBs, SMTP
extensions, IP over FOO, PPP, DNS, etc.) could easily be imagined.


2.1 Scope

The procedure used in this investigation is an exhaustive reading of the
applicable RFC's.  This task involves reading approximately 25000 pages
of protocol specifications.  To compound this, it was more than a
process of simple reading.  It was necessary to attempt to understand
the purpose and functionality of each protocol in order to make a proper
determination of IPv4 reliability.  The author has made every effort to
make this effort and the resulting document as complete as possible, but
it is likely that some subtle (or perhaps not so subtle) dependence was
missed.  The author encourage those familiar (designers, implementers
or anyone who has an intimate knowledge) with any protocol to review
the appropriate sections and make comments.


3.0  Summary of Results

In the initial survey of RFCs 175 positives were identified, out of a
total of 871, broken down as follows:

        Standards                         32 of  65 or 49.23%
        Draft Standards                   14 of  59 or 23.73%
        Proposed Standards               107 of 602 or 17.77%
        Experimental RFCs                 22 of 145 or 15.17%

Of those identified many require no action because they document
outdated and unused protocols (see STD 44/RFC 891 in Section 3.44 for
example), while others are document protocols that are actively being
updated by the appropriate working groups (SNMP MIBs for example).
Additionally there are many instances of standards that should be
updated but do not cause any operational impact (STD 3/RFCs 1122 & 1123
for example) if they are not updated.  The remaining instances are
documented below.

3.1 Application Area Specifications

In the initial survey of RFCs, 17 positives were identified out of a
total of 262, broken down as follows:


        Standards:                         4 of  24 or 16.67%
        Draft Standards:                   3 of  20 or 15.00%
        Proposed Standards:                5 of 160 or  3.13%
        Experimental RFCs:                 5 of  58 or  8.62%

For more information, please look at [1].


3.2 Internet Area Specifications

In the initial survey of RFCs, 62 positives were identified out of a
total of 159, broken down as follows:

        Standards                          16 of 18 or 88.89%
        Draft Standards                     6 of 16 or 37.50%
        Proposed Standards                 35 of 98 or 35.71%
        Experimental RFCs                   5 of 27 or 18.52%

For more information, please look at [2].


3.3 Operations & Management Area Specifications

In the initial survey of RFCs, 41 positives were identified out of a
total of 163, broken down as follows:

        Standards                          6 of  10 or 60.00%
        Draft Standards                    3 of  18 or 16.67%
        Proposed Standards                31 of 121 or 25.62%
        Experimental RFCs                  1 of  14 or  7.14%

For more information, please look at [3].


3.4 Routing Area Specifications

In the initial survey of RFCs,  25 positives were identified out of a
total of 53, broken down as follows:

        Standards                           2 of  7 or 28.57%
        Draft Standards                     1 of  2 or 50.00%
        Proposed Standards                 17 of 33 or 51.52%
        Experimental RFCs                   5 of 11 or 45.45%

For more information, please look at [4].


3.5 Security Area Specifications

In the initial survey of RFCs, 6 positives were identified out of a
total of 127, broken down as follows:

        Standards                          0 of   1 or  0.00%
        Draft Standards                    1 of   3 or 33.33%
        Proposed Standards                 4 of 105 or  3.81%
        Experimental RFCs                  1 of  18 or  5.56%

For more information, please look at [5].


3.6 Sub-IP Area Specifications

In the initial survey of RFCs, 0 positives were identified out of a
total of 7, broken down as follows:

        Standards                           0 of  0 or  0.00%
        Draft Standards                     0 of  0 or  0.00%
        Proposed Standards                  0 of  6 or  0.00%
        Experimental RFCs                   0 of  1 or  0.00%

For information about the Sub-IP Area standards, please look at [6].


3.7 Transport Area Specifications

In the initial survey of RFCs, 24 positives were identified out of a
total of 100, broken down as follows:

        Standards                            4 of  5 or 80.00%
        Draft Standards                      0 of  0 or  0.00%
        Proposed Standards                  15 of 79 or 18.99%
        Experimental RFCs                    5 of 16 or 31.25%

For more information, please look at [7].

4.0  Discussion of "Long Term" Stability of Addresses on Protocols

In attempting this analysis it was determined that a full scale
analysis is well beyond the scope of this document.  Instead a short
discussion is presented on how such a framework might be established.

A suggested approach would be to do an analysis of protocols based on
their overall function, similar (but not strictly) to the OSI network
reference model.   It might be more appropriate to frame the discussion
in terms of the different Areas of the IETF.

The problem is fundamental to the overall architecture of the Internet
and its future.  One of the stated goals of the IPng (now IPv6) was
"automatic" and "easy" address renumbering.  An additional goal is
"stateless autoconfiguration."  To these ends, a substantial amount of
work has gone into the development of such protocols as DHCP and Dynamic
DNS.  This goes against the Internet age-old "end-to-end principle."

Most protocol designs implicitly count on certain underlying principles
that currently exist in the network.  For example, the design of packet
switched networks allows upper level protocols to ignore the underlying
stability of packet routes.  When paths change in the network, the
higher level protocols are typically unaware and uncaring.  This works
well since whether the packet goes A-B-C-D-E-F or A-B-X-Y-Z-E-F is of
little consequence.

In a world where endpoints (i.e. A and F in the example above) change
at a "rapid" rate, a new model for protocol developers should be
considered.  It seems that a logical development would be a change in
the operation of the Transport layer protocols.  The current model is
essentially a choice between TCP and UDP,  Neither of these protocols
provides any mechanism for an orderly handoff of the connection if and
when the network endpoint (IP) addresses changes.  Perhaps a third
major transport layer protocol should be developed, or perhaps updated
TCP & UDP specifications that include this function might be a better
solution.

There are many, many variables that would need to go into a successful
development of such a protocol.  Some issues to consider are: timing
principles; overlap periods as an endpoint moves from address A, to
addresses A & B (answers to both), to  only B; delays due to the
recalculation of routing paths, etc...


5.0 Security Consideration

This memo examines the IPv6-readiness of specifications; this does not
have security considerations in itself.


6.0 Acknowledgements

The authors would like to acknowledge the support of the Internet
Society in the research and production of this document.
Additionally the author, Philip J. Nesser II, would like to thanks
his partner in all ways, Wendy M. Nesser.

The editor, Andreas Bergstrom, would like to thank Pekka Savola
for guidance and collection of comments for the editing of this
document.
He would further like to thank Alan E. Beard, Jim Bound, Brian Carpenter
and Itojun for valuable feedback on many points of this document.


7.0 References

7.1 Normative

[1]  Philip J. Nesser II, Rute Sofia. "Survey of IPv4 Addresses
     in Currently Deployed IETF Application Area Standards",
     draft-ietf-v6ops-ipv4survey-apps-01.txt
     IETF work in progress, June 2003

[2]  Philip J. Nesser II, Cleveland Mickles. "Internet Area: Survey
     of IPv4 Addresses Currently Deployed Deployed IETF Standards",
     draft-ietf-v6ops-ipv4survey-int-01.txt
     IETF work in progress, June 2003

[3]  Philip J. Nesser II, Andreas Bergstrom. "Survey of IPv4 Addresses
     in Currently Deployed IETF Operations & Management Area Standards",
     draft-ietf-v6ops-ipv4survey-ops-03.txt
     IETF work in progress, September 2003

[4]  Philip J. Nesser II, Cesar. Olvera. "Survey of IPv4 Addresses
     in Currently Deployed IETF Routing Area Standards",
     draft-ietf-v6ops-ipv4survey-routing-01.txt IETF work in progress,
     June 2003

[5]  Philip J. Nesser II, Andreas Bergstrom. "Survey of IPv4 Addresses
     in Currently Deployed IETF Security Area Standards",
     draft-ietf-v6ops-ipv4survey-sec-02.txt IETF work in progress,
     September 2003

[6]  Philip J. Nesser II, Andreas Bergstrom. "Survey of IPv4 Addresses
     in Currently Deployed IETF Sub-IP Area Standards",
     draft-ietf-v6ops-ipv4survey-subip-02.txt IETF work in progress,
     September 2003

[7]  Philip J. Nesser II, Andreas Bergstrom "Survey of IPv4 Addresses
     in Currently Deployed IETF Transport Area Standards",
     draft-ietf-v6ops-ipv4survey-trans-02.txt IETF work in progress,
     September 2003


8.0 Authors Addresses

Please contact the author with any questions, comments or suggestions
at:

Philip J. Nesser II
Principal
Nesser & Nesser Consulting
13501 100th Ave NE, #5202
Kirkland, WA 98034

Email:  phil@nesser.com
Phone:  +1 425 481 4303
Fax:    +1 425 482 9721


Andreas Bergstrom
Ostfold University College
Email: andreas.bergstrom@hiof.no
Address: Rute 503 Buer
         N-1766 Halden
         Norway



9.0 Intellectual Property Statement

   The IETF takes no position regarding the validity or scope of any
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   The IETF invites any interested party to bring to its attention any
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   this standard. Please address the information to the IETF Executive
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10.0  Full Copyright Statement

   Copyright (C) The Internet Society (2000).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
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