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+Network Working Group                                          E. Gerich
+Request for Comments: 1814                            Merit Network Inc.
+Category: Informational                                        June 1995
+
+
+                       Unique Addresses are Good
+
+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 IAB suggests that while RFC 1597 establishes reserved IP address
+   space for the use of private networks which are isolated and will
+   remain isolated from the Internet, any enterprise which anticipates
+   external connectivity to the Internet should apply for a globally
+   unique address from an Internet registry or service provider.
+
+Introduction
+
+   With the advent of RFC 1466 and RFC 1597 the criteria for the
+   allocation of unique IP numbers and the reservation of unique IP
+   numbers have been defined. The IAB and the IANA wish to offer
+   guidance to the Internet registries as to the application of these
+   two documents.  The author submits this document as an informational
+   RFC on behalf of the Internet Architecture Board and the IANA.
+
+Guidance to Internet Registries
+
+   RFC 1466 lists the criteria to which Internet registries should
+   conform.  One of the criteria is that the Internet registry is
+   committed to allocate IP numbers according to the guidelines
+   established by the IANA and the IR. Those guidelines (for Classes A,
+   B, and C addresses) are documented in RFC 1466.
+
+   Internet Registries have agreed to comply with the guidelines
+   established by RFC 1466 and therefore, if an organization meets the
+   size requirement for the requested address(es) and submits an
+   engineering plan, the organization has fulfilled the necessary
+   requirements.  The Internet Registry will make the allocation based
+   on the established criteria.
+
+
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+Gerich                       Informational                      [Page 1]
+
+RFC 1814               Unique Addresses are Good               June 1995
+
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+   The preconditions defined in RFC 1466 are limited to number of hosts
+   and subnets as well as an engineering plan.  The existence of private
+   address space (RFC 1597) shall not prevent an enterprise from
+   obtaining public address space according to the allocation criteria
+   (currently, RFC 1466).
+
+   An enterprise may be required by a Internet registry to submit an
+   engineering plan documenting a realistic deployment schedule and
+   reasonable attention to conservation of address space to support the
+   size of the enterprise's request for globally unique IP addresses.
+
+   It is perfectly appropriate for an Internet registry to inform an
+   organization of the provisions of RFC 1597.  Any organization
+   considering the use of private network numbers should carefully
+   consider the potential advantages and possible problems as discussed
+   in RFCs 1597 and 1627.
+
+   RFC 1597 establishes reserved IP address space for the use of private
+   networks which are isolated and will remain isolated from the
+   Internet. Thus RFC 1597 documents a way that private enterprises may
+   assure that their networks will remain segregated from the Internet.
+   The addresses designated in RFC 1597 should not be routed by the
+   Internet.
+
+   Any enterprise with a significantly large number of hosts which might
+   require external connectivity to the Internet at the IP layer should
+   apply for a block of globally unique addresses from an Internet
+   registry.  Enterprises with a small to medium number of hosts that
+   require external connectivity to the Internet at the IP layer should
+   expect to use globally unique addresses for these hosts, assigned to
+   them by their current Internet service provider from its own assigned
+   addresses, if it has such addresses to distribute.
+
+   If an enterprise with a small to medium number of hosts desires
+   unique IP addresses, and is unable to obtain them under reasonable
+   conditions from a service provider, or has no service provider, the
+   Internet registries are recommended to assign such addresses without
+   conditions with respect to service provider selection.  The
+   registries should make clear to the enterprise that when the
+   enterprise decides to connect to the Internet, the assigned addresses
+   are no guarantee of Internet-wide IP connectivity. In fact, some
+   service providers may require renumbering as a condition of
+   connectivity.
+
+   Any organization which anticipates having external connectivity is
+   encouraged to apply for a globally unique IP address.  Globally
+   unique addresses are necessary to differentiate between destinations
+   on the Internet.  One must understand, however, that the globally
+
+
+
+Gerich                       Informational                      [Page 2]
+
+RFC 1814               Unique Addresses are Good               June 1995
+
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+   unique address by itself does not necessarily guarantee global
+   connectivity.  Individual network service providers may place
+   restrictions on what addresses they will or will not route based on
+   operational limitations.
+
+References
+
+   [1] Gerich, E., "Guidelines for Management of IP Address Space", RFC
+       1466, Merit Network Inc., May 1993.
+
+   [2] Rekhter, Y., Moskowitz, B., Karrenberg, D., and G. de Groot,
+       "Address Allocation for Private Internets", RFC 1597, T.J. Watson
+       Research Center, IBM Corp., Chrysler Corp., RIPE NCC, RIPE NCC,
+       March 1994.
+
+Security Considerations
+
+   Security issues are not discussed in this memo.
+
+Author's Address
+
+   Elise Gerich
+   Merit Network Inc.
+   4251 Plymouth Road
+   Ann Arbor, MI 48105
+
+   Phone: +1 313 764 9430
+   Fax: +1 313 747 3745
+   EMail: epg@merit.edu
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+Gerich                       Informational                      [Page 3]
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