Internet Engineering Task Force Jie. Hu
Internet-Draft China Telecom
Intended status: Standards Track Jacni. Qin
Expires: September 15, 2011 Liquan. Yuan
ZTE
Glen. Zorn
Network Zen
Adrian. Kennard
FireBrick Ltd
March 14, 2011
PPP IPv6 Control Protocol Extensions
draft-hu-pppext-ipv6cp-extensions-01
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.
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This Internet-Draft will expire on September 15, 2011.
Copyright Notice
Copyright (c) 2011 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
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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
[I-D.hu-pppext-ipv6cp-requirements] 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 IPv6 prefix
option is designed to meet the requirements specified in [RFC3769].
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 [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
Description
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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
3 (TBD1)
Length
18
IPv6-Address
The sixteen octet IPv6-Address is the desired local address of
the sender of a Configure-Request. If all sixteen octects are
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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
5 (TBD2)
Length
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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 desired
is indicated in the Prefix-Length field. That means, for instance
a sender may set the field to zero while the length of the prefix
desired is indicated in the Prefix-Length field, or both the
IPv6-Prefix and Prefix-Length fields may be set to zero indicating
that the sender doesn't have a preference for a prefix of any
special value or length.
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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Primary-DNS-IPv6-Addr |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Primary-DNS-IPv6-Addr (cont.)
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Primary-DNS-IPv6-Addr (cont.)
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Primary-DNS-IPv6-Addr (cont.)
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Primary-DNS-IPV6-Addr |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type
129 (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
131 (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.hu-pppext-ipv6cp-requirements]
Hu, J., Chen, Y., Zhao, H., and D. Mao, "PPPv6 Problem
statement and requirements",
draft-hu-pppext-ipv6cp-requirements-00 (work in progress),
October 2010.
[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.
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[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3769] Miyakawa, S. and R. Droms, "Requirements for IPv6 Prefix
Delegation", RFC 3769, June 2004.
[RFC5072] S.Varada, Haskins, D., and E. Allen, "IP Version 6 over
PPP", RFC 5072, September 2007.
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 5855 2808
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
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Glen Zorn
Network Zen
Seattle, Washington,
USA
Phone:
Email: gwz@net-zen.net
Adrian Kennard
FireBrick Ltd
Enterprise Court
BRACKNELL RG12 1QS,
UK
Phone: +44 3333 400 500
Email: adrian.kennard@firebrick.co.uk
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