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Internet Engineering Task Force                                  Jie. Hu
Internet-Draft                                             China Telecom
Intended status: Standards Track                              Jacni. Qin
Expires: April 20, 2011                                     Liquan. Yuan
                                                                     ZTE
                                                              Glen. Zorn
                                                             Network Zen
                                                        October 17, 2010


                  PPP IPv6 Control Protocol Extensions
                  draft-hu-pppext-ipv6cp-extensions-00

Abstract

   The IPv6 Control Protocol (IPv6CP) is one of Network Control
   Protocols(NCPs) that are defined by the Point-to-Point Protocol(PPP)
   for establishing and configuring different network protocols.

   This document extends the IPv6CP for negotiating and configuring IPv6
   network parameters over PPP links, including IPv6 address, IPv6
   prefix, primary and alternative DNS server addresses.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 20, 2011.

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of



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   publication of this document.  Please review these documents
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   it for publication as an RFC or to translate it into languages other
   than English.

































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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  4
   2.  IPv6CP Configuration Options . . . . . . . . . . . . . . . . .  4
     2.1.  IPv6-Address . . . . . . . . . . . . . . . . . . . . . . .  4
     2.2.  IPv6-Prefix  . . . . . . . . . . . . . . . . . . . . . . .  6
     2.3.  Primary DNS Server IPv6 Address  . . . . . . . . . . . . .  7
     2.4.  Alternative DNS Server IPv6 Address  . . . . . . . . . . .  8
   3.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 10
   4.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
   6.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     6.1.  Normative References . . . . . . . . . . . . . . . . . . . 10
     6.2.  Informative References . . . . . . . . . . . . . . . . . . 11
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11



































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1.  Introduction

   The point-to-point protocol provides a standard method for
   transporting network-layer protocol datagrams over point-to-point
   links.  It also defines an extensible Link Control Protocol (LCP),
   and a family of Network Control protocols (NCPs) for establishing and
   configuring different network-layer protocols.

   To respond to the requirements specified by
   [draft-hu-pppext-ipv6cp-requirements-00] and guarantee the
   negotiation of essential parameters needed for establishing a basic
   IPv6 connectivity over PPP links, this document extends the IPv6CP
   defining the negotiation of IPv6 address, IPv6 Prefix, primary and
   alternative DNS server addresses.  Please note that the prefix
   negotiated here should be used by the local node(usually a
   Residential Gateway) as an address pool for allocating addresses to
   hosts on the attached networks.

   This document combines serveral drafts: [I-D.qin-pppext-ipv6-addr-
   pref] [I-D.ietf-pppext-ipv6-dns-addr] [I-D.huang-ipv6cp-options]

1.1.  Requirements Language

   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 RFC 2119 [RFC2119].


2.  IPv6CP Configuration Options

   The IPv6-Address configuration option, type TBD1, provides a method
   of obtaining the IPv6 address to be used by the local end of the PPP
   link.

   The IPv6-prefix configuration option, type TBD2, provides a method of
   obtaining the prefix to be used by the local end of the PPP link as
   the address pool.

   The two name server address configuration options, TBD3 and TBD4,
   provide a method of obtaining the addresses of DNS servers on the
   remote IPv6 network.

   For implementational convenience, these options are designed to be
   identical in format and behavior to options which are already
   present.

2.1.  IPv6-Address




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Description

   This Configuration Option provides a way to negotiate the IPv6
   address to be used on the local end of the link.  It allows the
   sender of the Configure-Request to state which IPv6-address is
   desired, or to request that the peer provide the information. the
   peer can provide this information by NAKing the option, and returning
   a valid IPv6-address.

   If negotiation about the remote IPv6-address is required, and the
   peer did not provide the option in its Configure-Request, the option
   should be appended to a Configure-NAK.  The value of the IPv6-address
   given must be acceptable as the remote IPv6-address, or indicate a
   request that the peer provide the information.

   By default, no IPv6 address is assigned.

   A summary of the IPv6-address Configuration Option format is shown
   below.  The field are transimitted from left to right.



Configuration-Option: IPv6-Address

   0                   1                   2                   3
   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type      |    Length     |         IPv6-Address
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                           IPv6-Address (cont.)
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                           IPv6-Address (cont.)
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                           IPv6-Address (cont.)
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
             IPv6-Address          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Type

   TBD1

Length

   18

IPv6-Address




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   The sixteen octet IPv6-Address is the desired local address of
   the sender of a Configure-Request. If all sixteen octects are
   set to zero, it indicates a request that the peer provide the
   IP-Address information.

Default

   No IPv6 address is assigned.

2.2.  IPv6-Prefix

Description

   This Configuration Option provides a way to negotiate the IPv6 prefix
   to be used on local end(usually a Router or Residential Gateway) of
   the link for further allocating addresses to hosts on the attached
   networks.  It allows the sender of the Configure-Request to state
   which IPv6 prefix is desired, or to request that the peer provide the
   information.  The peer can provide this information by NAKing the
   option, and returning a valid IPv6 prefix.

   By default, no IPv6 prefix is assigned.


   A summary of the IPv6-Prefix Configuration Option format is shown
   below.  The field are transimitted from left to right.


Configuration-Option: IPv6-Prefix

   0                   1                   2                   3
   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type      |    Length     | Prefix-Length |  IPv6-Prefix  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                           IPv6-Prefix (cont.)
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                           IPv6-Prefix (cont.)
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                           IPv6-Prefix (cont.)
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                      IPv6-Prefix                  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Type

   TBD2




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Length

   19


Prefix-Length

   This field is one octet and indicates the available length of the
   prefix in the IPv6-Prefix field.

IPv6-Prefix

   The IPv6-Prefix field associated with the Prefix-length field is
   the desired prefix of the sender of a Configure-Request. If all
   sixteen octects are set to zero, it indicates a request that
   the peer provide the prefix information and the length required
   is indicated in the Prefix-Length field.

   The fixed sixteen octet space is used no matter what exactly the
   available prefix length is.


Default

   No IPv6 prefix is assigned.

2.3.  Primary DNS Server IPv6 Address

   Description

      This Configuration Option defines a method for negotiating with
      the remote peer the IPv6 address of the primary DNS server to be
      used on the local end of the link.  If the local peer requests an
      invalid server address (which it will typically do intentionally)
      the remote peer specifies the address by Naking this option, and
      returning the IPv6 address of a valid DNS server.

      By default, no primary DNS address is provided.

      A summary of the Primary DNS IPv6 Address Configuration Option
      format is shown below.  The fields are transmitted from left to
      right.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     Type      |    Length     |      Primary-DNS-IPv6-Addr    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



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      |                 Primary-DNS-IPv6-Addr (cont.)
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                 Primary-DNS-IPv6-Addr (cont.)
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                 Primary-DNS-IPv6-Addr (cont.)
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    Primary-DNS-IPV6-Addr      |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Type

      TBD3

   Length

      18

   Primary-DNS-IPv6-Addr

      The sixteen octet Primary-DNS-Addr is the address (in network
      byte order) of the primary DNS server to be used by the local
      peer.  If all sixteen octets are set to zero, it indicates an
      explicit request that the peer provide the address information in
      a Config-Nak packet.

   Default

      No address is provided.

2.4.  Alternative DNS Server IPv6 Address




















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   Description

      This Configuration Option defines a method for negotiating with
      the remote peer the IPv6 address of an alternate DNS server to be
      used on the local end of the link.  If the local peer requests an
      invalid server address (which it will typically do intentionally)
      the remote peer specifies the address by Naking this option, and
      returning the IPv6 address of a valid DNS server.

      By default, no alternative DNS address is provided.

      A summary of the Alternative DNS Server IPv6 Address
      Configuration Option format is shown below.  The fields are
      transmitted from left to right.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     Type      |    Length     |        Alt-DNS-IPv6-Addr      |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                 Alt-DNS-IPv6-Address (cont.)
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                 Alt-DNS-IPv6-Address (cont.)
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                 Alt-DNS-IPv6-Address (cont.)
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     Alt-DNS-IPv6-Address      |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type

      TBD4

   Length

      18

   Alt-DNS-IPv6-Address

      The sixteen octet Secondary-DNS-IPv6-Address is the IPv6 address
      (in network byte order) of the secondary DNS server to be used
      by the local peer.  If all sixteen octets are set to zero, it
      indicates an explicit request that the peer provide the address
      information in a Config-Nak packet.

   Default

      No address is provided.



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3.  Acknowledgements

   This document combines serveral drafts: [I-D.qin-pppext-ipv6-addr-
   pref] [I-D.ietf-pppext-ipv6-dns-addr] [I-D.huang-ipv6cp-options]


4.  IANA Considerations

   IANA is requested to assign values for the Type field of the IPv6CP
   Configuration Options specified in this document.


5.  Security Considerations

   No new security concerns raised out of this document.

6.  References

6.1.  Normative References

   [I-D.huang-ipv6cp-options]
              Huang, J., "IPv6CP Options for PPP Host Configuration",
              draft-huang-ipv6cp-options-00 (work in progress),
              February 2010.

   [I-D.ietf-pppext-ipv6-dns-addr]
              Hiller, T. and G. Zorn, "PPP IPV6 Control Protocol
              Extensions for DNS Server Addresses",
              draft-ietf-pppext-ipv6-dns-addr-03 (work in progress),
              June 2003.

   [I-D.qin-pppext-ipv6-addr-pref]
              Li, Y., Qin, J., and L. Yuan, "PPP IPv6 Control Protocol
              Extensions for Address and Prefix",
              draft-qin-pppext-ipv6-addr-pref-00 (work in progress),
              February 2010.

   [RFC1661]  Simpson, W., "The Point-to-Point Protocol (PPP)", STD 51,
              RFC 1661, July 1994.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC5072]  S.Varada, Haskins, D., and E. Allen, "IP Version 6 over
              PPP", RFC 5072, September 2007.







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6.2.  Informative References

   [RFC3552]  Rescorla, E. and B. Korver, "Guidelines for Writing RFC
              Text on Security Considerations", BCP 72, RFC 3552,
              July 2003.


Authors' Addresses

   Jie Hu
   China Telecom
   No.118, Xizhimennei
   Beijing,   100035
   China

   Phone: +86 10 58552808
   Email: huj@ctbri.com.cn


   Jacni Qin
   ZTE
   Shanghai,
   China

   Phone: +86 1391 8619 913
   Email: jacniq@gmail.com


   Liquan Yuan
   ZTE
   Shanghai,
   China

   Phone: +86 21 6889 5515
   Email: ylq@zte.com.cn


   Glen Zorn
   Network Zen
   Seattle, Washington,
   USA

   Phone:
   Email: gwz@net-zen.net







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