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- Network Working Group M. Taylor
- Request for Comments: 1674 CDPD Consortium
- Category: Informational August 1994
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- A Cellular Industry View of IPng
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- Status of this Memo
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- 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.
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- Abstract
-
- This memo is a response to RFC 1550, "IP: Next Generation (IPng)
- White Paper Solicitation". The statements in this paper are intended
- as input to the technical discussions within IETF, and do not
- represent any endorsement or commitment on the part of the cellular
- industry, the Cellular Digital Packet Data (CDPD) consortium of
- service providers or any of its constituent companies.
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- Introduction
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- This is a draft of the requirements for IPng as envisioned by
- representatives of the Cellular Digital Packet Data (CDPD) consortium
- of service providers. As the leading service providers for this
- nascent technology, which will provide the capability for mobility of
- native mainstream connectionless network layer-based applications it
- is our intention to support whatever form IPng takes. However, there
- are several requirements which we feel IPng must meet.
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- Mobility
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- Since we will offer mobile services, our primary requirement is that
- IPng not inhibit our support of mobility. IPng must not impede
- devices from being able to operate anywhere anytime. Applications on
- these mobile devices must look and feel the same to the user
- regardless of location. NPDUs should be self-contained and not
- disallow the redirection inherent to our mobility solution, i.e.,
- IPng must be connectionless.
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- Further, since IPng provides an opportunity for design enhancements
- above and beyond IPv4, we propose that native support for mobility be
- regarded as an explicit IPng requirement. Local area and wide area
- wireless technology creates new opportunities for both TCP/IP and the
- Internet. Although the capability for mobility is orthogonal to the
- wired or wireless nature of the data link in use, the rapid
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- Taylor [Page 1]
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- RFC 1674 A Cellular Industry View of IPng August 1994
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- deployment wireless technology amplifies the requirement for
- topological flexibility.
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- As a by-product of mobility, the significance of "occasionally-
- connected hosts" increases. The ability to accommodate
- occasionally-connected hosts in IPng is a requirement.
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- Scale
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- In terms of scale, we envision some 20 to 40 million users by the
- year 2007. In this context a "user" can be anything from a vending
- machine to a "road warrior". These numbers are for North America
- alone. Worldwide, we anticipate that IPng should be able to support
- billions of "users". Of course, the sparseness of network address
- assignments which is necessary for subnetting, etc., dictates that
- IPng should support at least tens or hundreds of billions of
- addresses.
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- Addressing
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- In terms of addressing, we would expect addresses to be hierarchical.
- In addition, a node with multiple links should require only a single
- address although more than one address should also be possible. The
- mapping of names to addresses should be independent of location; an
- address should be an address, not a route. Variable-length
- addressing is also required to ensure continued protocol (IPng)
- extensibility. Administration of address assignments should be
- distributed and not centralized as it is now.
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- Security
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- IPng should also support security mechanisms which will grow
- increasingly important on the proverbial "information highway" for
- commercial users. Security services which may optionally be expected
- from a Layer 3 entity such as IPng include peer entity
- authentication, data confidentiality, traffic flow confidentiality,
- data integrity and location confidentiality.
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- Accounting
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- The ability to do accounting at Layer 3 is a requirement. The CDPD
- specification can be used as a model of the type of accounting
- services that we need.
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- Taylor [Page 2]
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- RFC 1674 A Cellular Industry View of IPng August 1994
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- Route Selection
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- In the voice communications arena, "equal access" and choice of an
- "interexchange carrier (IXC)" are issues that must be addressed.
- Similar requirements for data may also exist.
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- Source- and policy-based routing for inter-domain traffic can address
- this requirement. IPng must allow the selection of at least the
- first transient network service provider based on the source host.
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- Data Efficiency
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- The bandwidth of wide area wireless networks is a precious resource,
- the use of which must be optimized. IPng must allow optimal use of
- the underlying Layer 2 medium. Layer 3 Protocol Control Information
- (PCI) should be as condensed as possible. The protocol should be
- optimized for data efficiency.
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- Packet prioritization must also be supported by IPng in order to
- optimize the use of low speed networks. This requirement includes
- both class and grade of service definitions for flexibility.
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- Transition
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- The final requirement for IPng is that it must interoperate with IP
- for the foreseeable future. Bridging mechanisms must be supported
- and a strategy for the transition from IPv4 to IPng must be defined.
- Use of options fields, etc., are one mechanism to support the
- requirement for IPng protocols to support IP addresses and headers.
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- Security Considerations
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- See section on Security.
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- Author's Address
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- Mark S. Taylor
- Director of System Development
- McCaw Cellular Communications, Inc.
- Wireless Data Division
- 10230 NE Points Drive
- Kirkland, WA 98033-7869 USA
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- EMail: mark.s.taylor@airdata.com
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- Taylor [Page 3]
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