Internet DRAFT - draft-evans-dhc-dhcpv6-reconfigure-rebind
draft-evans-dhc-dhcpv6-reconfigure-rebind
Network Working Group D. R. Evans
Internet-Draft ARRIS International, Inc.
Expires: October 19, 2006 R. Droms
Cisco Systems, Inc.
April 17, 2006
Rebind Capability in DHCPv6 Reconfigure Messages
draft-evans-dhc-dhcpv6-reconfigure-rebind-00.txt
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Copyright (C) The Internet Society (2006).
Abstract
The Rebind message type in the Reconfigure Message option of a
Reconfigure message allows DHCPv6 servers to instruct clients to
perform a Rebind operation.
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1. Introduction
DHCPv6 [2] allows a server to send an unsolicited Reconfigure message
to a client. The client's response to a Reconfigure message,
according to [2] is either a Renew or an Information-Request message,
depending on the contents of the msg-type field in the Reconfigure
Message option of the Reconfigure message.
In a network with multiple DHCPv6 servers, the Reconfigure message
may not be sent by the same server as the one from which the client
last obtained configuration and/or addressing information. If the
Reconfigure message commands the client to perform a Renew, [2] does
not specify to which server the client should send the Renew. This
difficulty is avoided if the server commands the client to perform an
Information-Request, since such messages are multicast. However,
Information-Request messages do not cause addressing configuration to
be returned.
This document expands the allowed values of the msg-type field to
allow the server to indicate that the client is to attempt to perform
a Rebind; since Rebind messages are multicast, this avoids the
necessity of the client contacting a particular server. Rebind
messaegs also cause all configuration information, including
addresses, to be returned from a server.
2. 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 [1].
3. The Reconfigure Message option of the DHCPv6 Reconfigure Message
A server includes a Reconfigure Message option in a Reconfigure
message to indicate to the client whether the client responds with a
Renew, an Information-request, or a Rebind message. The format of
this option is:
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_RECONF_MSG | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| msg-type |
+-+-+-+-+-+-+-+-+
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option-code OPTION_RECONF_MSG (19).
option-len 1.
msg-type 5 for Renew message, 6 for Rebind, 11 for
Information-request message.
4. Security Considerations
This document adds no new security considerations beyond those
present in [2].
5. IANA Considerations
There are no actions for IANA associated with this document.
6. Normative References
[1] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[2] Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C., and M.
Carney, "Dynamic Host Configuration Protocol for IPv6 (DHCPv6)",
RFC 3315, July 2003.
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Authors' Addresses
D. R. Evans
ARRIS International, Inc.
7912 Fairview Road
Boulder, CO 80303
USA
Phone: +1 303.494.0394
Email: N7DR@arrisi.com
Ralph Droms
Cisco Systems, Inc.
1414 Massachusetts Avenue
Boxborough, MA 01719
USA
Phone: +1 978.936.1674
Email: rdroms@cisco.com
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