Network Working Group S. Varada, Ed.
Request for Comments: 5072 Transwitch
Obsoletes: 2472 D. Haskins
Category: Standards Track E. Allen
September 2007
IP Version 6 over PPP
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Abstract
The Point-to-Point Protocol (PPP) provides a standard method of
encapsulating network-layer protocol information over point-to-point
links. PPP also defines an extensible Link Control Protocol, and
proposes a family of Network Control Protocols (NCPs) for
establishing and configuring different network-layer protocols.
This document defines the method for sending IPv6 packets over PPP
links, the NCP for establishing and configuring the IPv6 over PPP,
and the method for forming IPv6 link-local addresses on PPP links.
It also specifies the conditions for performing Duplicate Address
Detection on IPv6 global unicast addresses configured for PPP links
either through stateful or stateless address autoconfiguration.
This document obsoletes RFC 2472.
Varada, et al. Standards Track [Page 1]
RFC 5072 IP Version 6 over PPP September 2007
Table of Contents
1. Introduction ....................................................2
1.1. Specification of Requirements ..............................3
2. Sending IPv6 Datagrams ..........................................3
3. A PPP Network Control Protocol for IPv6 .........................3
4. IPV6CP Configuration Options ....................................4
4.1. Interface Identifier .......................................4
5. Stateless Autoconfiguration and Link-Local Addresses ............9
6. Security Considerations ........................................11
7. IANA Considerations ............................................11
8. Acknowledgments ................................................11
9. References .....................................................12
9.1. Normative References ......................................12
9.2. Informative references ....................................12
Appendix A: Global Scope Addresses................................14
Appendix B: Changes from RFC-2472.................................14
1. Introduction
PPP has three main components:
1) A method for encapsulating datagrams over serial links.
2) A Link Control Protocol (LCP) for establishing, configuring, and
testing the data-link connection.
3) A family of Network Control Protocols (NCPs) for establishing and
configuring different network-layer protocols.
In order to establish communications over a point-to-point link, each
end of the PPP link must first send LCP packets to configure and test
the data link. After the link has been established and optional
facilities have been negotiated as needed by the LCP, PPP must send
NCP packets to choose and configure one or more network-layer
protocols. Once each of the chosen network-layer protocols has been
configured, datagrams from each network-layer protocol can be sent
over the link.
In this document, the NCP for establishing and configuring the IPv6
over PPP is referred to as the IPv6 Control Protocol (IPV6CP).
The link will remain configured for communications until explicit LCP
or NCP packets close the link down, or until some external event
occurs (power failure at the other end, carrier drop, etc.).
This document obsoletes the earlier specification from RFC 2472 [7].
Changes from RFC 2472 are listed in Appendix B.
Varada, et al. Standards Track [Page 2]
RFC 5072 IP Version 6 over PPP September 2007
1.1. Specification of Requirements
In this document, several words are used to signify the requirements
of the specification.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [6].
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