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- Network Working Group E. Gerich
- Request for Comments: 1814 Merit Network Inc.
- Category: Informational June 1995
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- Unique Addresses are Good
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- 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]
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- 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
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- Gerich Informational [Page 2]
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- 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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