Network Working Group J. Brzozowski
Request for Comments: 5007 Comcast Cable
Category: Standards Track K. Kinnear
B. Volz
S. Zeng
Cisco Systems, Inc.
September 2007
DHCPv6 Leasequery
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
This document specifies a leasequery exchange for the Dynamic Host
Configuration Protocol for IPv6 (DHCPv6) that can be used to obtain
lease information about DHCPv6 clients from a DHCPv6 server. This
document specifies the scope of data that can be retrieved as well as
both DHCPv6 leasequery requestor and server behavior. This document
extends DHCPv6.
Brzozowski, et al. Standards Track [Page 1]
RFC 5007 DHCPv6 Leasequery September 2007
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Protocol Overview . . . . . . . . . . . . . . . . . . . . . . 4
3.1. On-Demand Query . . . . . . . . . . . . . . . . . . . . . 4
3.2. Anticipatory Query . . . . . . . . . . . . . . . . . . . . 5
3.3. Query Types . . . . . . . . . . . . . . . . . . . . . . . 5
4. Protocol Details . . . . . . . . . . . . . . . . . . . . . . . 6
4.1. Message and Option Definitions . . . . . . . . . . . . . . 6
4.1.1. Messages . . . . . . . . . . . . . . . . . . . . . . . 6
4.1.2. Options . . . . . . . . . . . . . . . . . . . . . . . 6
4.1.3. Status Codes . . . . . . . . . . . . . . . . . . . . . 12
4.1.4. Transmission and Retransmission Parameters . . . . . . 12
4.2. Message Validation . . . . . . . . . . . . . . . . . . . . 12
4.2.1. LEASEQUERY . . . . . . . . . . . . . . . . . . . . . . 12
4.2.2. LEASEQUERY-REPLY . . . . . . . . . . . . . . . . . . . 13
4.3. DHCPv6 Leasequery Requestor Behavior . . . . . . . . . . . 13
4.3.1. Creation of LEASEQUERY . . . . . . . . . . . . . . . . 13
4.3.2. Transmission of LEASEQUERY . . . . . . . . . . . . . . 13
4.3.3. Receipt of LEASEQUERY-REPLY . . . . . . . . . . . . . 14
4.3.4. Handling DHCPv6 Client Data from Multiple Sources . . 15
4.4. DHCPv6 Leasequery Server Behavior . . . . . . . . . . . . 16
4.4.1. Receipt of LEASEQUERY Messages . . . . . . . . . . . . 16
4.4.2. Constructing the Client's OPTION_CLIENT_DATA . . . . . 17
4.4.3. Transmission of LEASEQUERY-REPLY Messages . . . . . . 17
5. Security Considerations . . . . . . . . . . . . . . . . . . . 17
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 20
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.1. Normative References . . . . . . . . . . . . . . . . . . . 20
8.2. Informative References . . . . . . . . . . . . . . . . . . 20
Brzozowski, et al. Standards Track [Page 2]
RFC 5007 DHCPv6 Leasequery September 2007
1. Introduction
The DHCPv6 [2] protocol specifies a mechanism for the assignment of
both IPv6 address and configuration information to IPv6 nodes. IPv6
Prefix Options for DHCPv6 [4] specifies a mechanism for the automated
delegation of IPv6 prefixes and related options. Similar to DHCPv4
[5], DHCPv6 servers maintain authoritative information related to
their operations including, but not limited to, lease information for
IPv6 addresses and delegated prefixes.
The requirement exists in various types of IPv6 deployments,
particularly those of a broadband variety, to leverage DHCPv6 [2] for
retrieving data related to the operation of DHCPv6 servers
programmatically. In particular, it is desirable to be able to
extract lease information about IPv6 addresses and delegated prefixes
assigned using DHCPv6 [2] [4]. Specific examples where this
information has illustrated value are in broadband networks to
datatracker.ietf.org