DHC B. Volz
Internet-Draft Cisco Systems, Inc.
Expires: June 20, 2005 December 20, 2004
DHCPv6 Relay Agent Remote ID Option
draft-volz-dhc-dhcpv6-remoteid-00.txt
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Copyright Notice
Copyright (C) The Internet Society (2004).
Abstract
This memo defines a new Relay Agent Remote-ID option for the Dynamic
Host Configuration Protocol for IPv6 (DHCPv6). This option is the
DHCPv6 equivalent for the Dynamic Host Configuration Protocol for
IPv4 (DHCPv4) Relay Agent Option's Remote-ID suboption as specified
in RFC 3046.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Requirements Terminology . . . . . . . . . . . . . . . . . . . 3
3. The Relay Agent Remote-ID Option . . . . . . . . . . . . . . . 3
4. DHCPv6 Relay Agent Behavior . . . . . . . . . . . . . . . . . 4
5. DHCPv6 Server Behavior . . . . . . . . . . . . . . . . . . . . 4
6. Security Considerations . . . . . . . . . . . . . . . . . . . 4
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 5
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 5
9.1 Normative References . . . . . . . . . . . . . . . . . . . . 5
9.2 Informative References . . . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . 5
Intellectual Property and Copyright Statements . . . . . . . . 6
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1. Introduction
DHCPv6 [1] provides IP addresses and configuration information for
IPv6 clients. It includes a relay agent capability, in which
processes within the network infrastructure receive multicast
messages from clients and relay them to DHCPv6 servers. In some
network environments, it will be useful for the relay agent to add
information to the DHCPv6 message before relaying it.
The information that relay agents supply can also be used in the
server's decision making about the addresses, delegated prefixes [4],
and configuration parameters that the client is to receive.
The memo specifies the DHCPv6 equivalent of the DHCPv4 Relay Agent
option's Remote-ID suboption as specified in [2]. The motivation and
usage scenarios are provided in [2].
2. Requirements Terminology
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 [3].
3. The Relay Agent Remote-ID Option
This option MAY be added by DHCPv6 relay agents which terminate
switched or permanent circuits and have mechanisms to identify the
remote host end of the circuit. The remote-id field MAY be used to
encode, for instance:
o a "caller ID" telephone number for dial-up connection
o a "user name" prompted for by a Remote Access Server
o a remote caller ATM address
o a "modem ID" of a cable data modem
o the remote IP address of a point-to-point link
o a remote X.25 address for X.25 connections
o an interface identity, which might be the switch's DUID [1]
suffixed by the interface-id from the DHCPv6 Interface-Id option.
The remote ID MUST be globally unique.
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The format of the DHCPv6 Relay Agent Remote-ID option is shown below:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| OPTION_REMOTE_ID | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
. .
. remote-id .
. .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code OPTION_REMOTE_ID (TBD)
option-len length, in octets, of the remote-id field.
The minimum length is 1 octet.
remote-id The opaque value for the globally unique
remote-id.
4. DHCPv6 Relay Agent Behavior
DHCPv6 relay agents MAY be configured to include a Remote-ID option
in relayed (RELAY-FORW) DHCPv6 messages.
5. DHCPv6 Server Behavior
This option provides additional information to the DHCPv6 server.
The DHCPv6 server, if it is configured to support this option, MAY
use this information to select parameters specific to particular
users, hosts, or subscriber modems. The remote-id SHOULD be
considered an opaque value, with policies based on exact string match
only; that is, the option SHOULD NOT be internally parsed by the
server.
There is no requirement that a server return this option and its data
in a RELAY-REPLY message.
6. Security Considerations
See [1] section 21.1, on securing DHCPv6 messages sent between
servers and relay agents, and section 23, on general DHCPv6 security
considerations. [2] discusses how this information can be used to
enhance trust in some environments.
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7. IANA Considerations
IANA is requested to assign a DHCPv6 option code for the Relay Agent
Remote-ID Option.
8. Acknowledgements
Thanks to Michael Patrick for [2], from which I've liberally borrowed
text.
9. References
9.1 Normative References
[1] Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C. and M.
Carney, "Dynamic Host Configuration Protocol for IPv6 (DHCPv6)",
RFC 3315, July 2003.
[2] Patrick, M., "DHCP Relay Agent Information Option", RFC 3046,
January 2001.
[3] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
9.2 Informative References
[4] Troan, O. and R. Droms, "IPv6 Prefix Options for Dynamic Host
Configuration Protocol (DHCP) version 6", RFC 3633, December
2003.
Author's Address
Bernard Volz
Cisco Systems, Inc.
1414 Massachusetts Ave.
Boxborough, MA 01719
USA
Phone: +1 978 936 0382
EMail: volz@cisco.com
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