Active DHCPv4 Lease Query
RFC 7724
| Document | Type |
RFC - Proposed Standard
(December 2015; No errata)
Updates RFC 6926
|
|
|---|---|---|---|
| Last updated | 2015-12-18 | ||
| Replaces | draft-kinnear-dhc-dhcpv4-active-leasequery | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Tomek Mrugalski | ||
| Shepherd write-up | Show (last changed 2015-08-12) | ||
| IESG | IESG state | RFC 7724 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Brian Haberman | ||
| Send notices to | (None) | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) K. Kinnear
Request for Comments: 7724 M. Stapp
Updates: 6926 B. Volz
Category: Standards Track Cisco Systems
ISSN: 2070-1721 N. Russell
Staples
December 2015
Active DHCPv4 Lease Query
Abstract
The Dynamic Host Configuration Protocol for IPv4 (DHCPv4) has been
extended with a Leasequery capability that allows a requestor to
request information about DHCPv4 bindings (RFC 4388). That mechanism
is limited to queries for individual bindings. In some situations,
individual binding queries may not be efficient, or even possible.
In addition, continuous update of an external requestor with
Leasequery data is sometimes desired. This document expands on the
DHCPv4 Leasequery protocol, and allows for active transfer of near
real-time DHCPv4 binding information data via TCP. This document
updates RFC 6926, "DHCPv4 Bulk Leasequery".
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7724.
Kinnear, et al. Standards Track [Page 1]
RFC 7724 Active DHCPv4 Lease Query December 2015
Copyright Notice
Copyright (c) 2015 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
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Kinnear, et al. Standards Track [Page 2]
RFC 7724 Active DHCPv4 Lease Query December 2015
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Protocol Overview . . . . . . . . . . . . . . . . . . . . . . 6
4. Interaction Between Active Leasequery and Bulk Leasequery . . 8
5. Message and Option Definitions . . . . . . . . . . . . . . . 9
5.1. Message Framing for TCP . . . . . . . . . . . . . . . . . 9
5.2. New or Changed Options . . . . . . . . . . . . . . . . . 9
5.2.1. dhcp-message-type . . . . . . . . . . . . . . . . . . 10
5.2.2. dhcp-status-code . . . . . . . . . . . . . . . . . . 10
5.3. Connection and Transmission Parameters . . . . . . . . . 11
6. Information Communicated by Active Leasequery . . . . . . . . 11
7. Requestor Behavior . . . . . . . . . . . . . . . . . . . . . 12
7.1. General Processing . . . . . . . . . . . . . . . . . . . 12
7.2. Initiating a Connection . . . . . . . . . . . . . . . . . 13
7.3. Forming an Active Leasequery . . . . . . . . . . . . . . 14
7.4. Processing Active Replies . . . . . . . . . . . . . . . . 15
7.4.1. Processing Replies from a Request Containing a
query-start-time . . . . . . . . . . . . . . . . . . 17
7.5. Closing Connections . . . . . . . . . . . . . . . . . . . 19
8. Server Behavior . . . . . . . . . . . . . . . . . . . . . . . 19
8.1. Accepting Connections . . . . . . . . . . . . . . . . . . 19
8.1.1. Update to RFC 6926 . . . . . . . . . . . . . . . . . 21
8.2. Replying to an Active Leasequery . . . . . . . . . . . . 21
8.3. Multiple or Parallel Queries . . . . . . . . . . . . . . 23
8.4. Closing Connections . . . . . . . . . . . . . . . . . . . 24
9. Security Considerations . . . . . . . . . . . . . . . . . . . 24
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 25
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 26
11.1. Normative References . . . . . . . . . . . . . . . . . . 26
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