A Model of IPv6/IPv4 Dual Stack Internet Access Service
RFC 4241
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RFC - Informational
(December 2005; Errata)
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Last updated |
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2013-03-02
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ISE
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plain text
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bibtex
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(None)
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Consensus Boilerplate |
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Unknown
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No shepherd assigned
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IESG |
IESG state |
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RFC 4241 (Informational)
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Responsible AD |
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Margaret Cullen
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Send notices to |
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Network Working Group Y. Shirasaki
Request for Comments: 4241 S. Miyakawa
Category: Informational T. Yamasaki
NTT Communications
A. Takenouchi
NTT
December 2005
A Model of IPv6/IPv4 Dual Stack Internet Access Service
Status of This Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2005).
IESG Note
This RFC is not a candidate for any level of Internet Standard. The
IETF disclaims any knowledge of the fitness of this RFC for any
purpose and notes that the decision to publish is not based on IETF
review apart from IESG review for conflict with IETF work. The RFC
Editor has chosen to publish this document at its discretion. See
RFC 3932 for more information.
Abstract
This memo is a digest of the user network interface specification of
NTT Communications' dual stack ADSL access service, which provide a
IPv6/IPv4 dual stack services to home users. In order to simplify
user setup, these services have a mechanism to configure IPv6
specific parameters automatically. The memo focuses on two basic
parameters: the prefix assigned to the user and the addresses of
IPv6 DNS servers, and it specifies a way to deliver these parameters
to Customer Premises Equipment (CPE) automatically.
Shirasaki, et al. Informational [Page 1]
RFC 4241 Dual Stack Access Service December 2005
1. Introduction
This memo is a digest of the user network interface specification of
NTT Communications' dual stack ADSL access service, which provide
IPv6/IPv4 dual stack services to home users. In order to simplify
user setup, these services have a mechanism to configure IPv6
specific parameters automatically. The memo focuses on two basic
parameters: the prefix assigned to the user and the addresses of
IPv6 DNS servers, and it specifies a way to deliver these parameters
to Customer Premises Equipment (CPE) automatically.
This memo covers two topics: an architecture for IPv6/IPv4 dual stack
access service and an automatic configuration function for IPv6-
specific parameters.
The architecture is mainly targeted at a leased-line ADSL service for
home users. It assumes that there is a Point-to-Point Protocol (PPP)
logical link between Customer Premises Equipment (CPE) and Provider
Edge (PE) equipment. In order to exclude factors that are specific
to access lines, this architecture only specifies PPP and its upper
layers. To satisfy [RFC3177], the prefix length that is delegated to
the CPE is /48, but /64 is also a possible option.
In this architecture, IPv6/IPv4 dual stack service is specified as
follows.
o IPv6 and IPv4 connectivities are provided over a single PPP
logical link.
o IPv6 connectivity is independent of IPv4 connectivity. IPV6CP
and IPCP work independently over a single PPP logical link.
Figure 1 shows an outline of the service architecture. NTT
Communications has been providing a commercial service based on this
architecture since the Summer 2002.
| _____________
[HOST]-+ +-----------+ +----------+ / \
| | Customer | ADSL line | Provider | | ISP core and |
+-+ Premises +---------------+ Edge |--| The internet |
| | Equipment | to subscriber +-----+----+ \_____________/
[HOST]-+ +-----------+ | | |
| +-----+------+ | +-+----------+
| AAA server | | | DNS server |
+------------+ | +------------+
+-+--------------+
| NTP server etc.|
Figure 1: Dual Stack Access Service Architecture +----------------+
Shirasaki, et al. Informational [Page 2]
RFC 4241 Dual Stack Access Service December 2005
The automatic configuration function aims at simplification of user
setup. Usually, users have to configure at least two IPv6-specific
parameters: prefix(es) assigned to them [RFC3769] and IPv6 DNS
servers' addresses. The function is composed of two sub-functions:
o Delegation of prefix(es) to be used in the user site.
o Notification of IPv6 DNS server addresses and/or other server
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