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DHCPv4 Lease Query by Relay Agent Remote ID
RFC 6148

Internet Engineering Task Force (IETF)                       P. Kurapati
Request for Comments: 6148                              Juniper Networks
Updates: 4388                                                 R. Desetti
Category: Standards Track                                       B. Joshi
ISSN: 2070-1721                                Infosys Technologies Ltd.
                                                           February 2011

              DHCPv4 Lease Query by Relay Agent Remote ID

Abstract

   Some relay agents extract lease information from the DHCP messages
   exchanged between the client and DHCP server.  This lease information
   is used by relay agents for various purposes like antispoofing and
   prevention of flooding.  RFC 4388 defines a mechanism for relay
   agents to retrieve the lease information from the DHCP server when
   this information is lost.  The existing lease query mechanism is
   data-driven, which means that a relay agent can initiate the lease
   query only when it starts receiving data to and from the clients.  In
   certain scenarios, this model is not scalable.  This document first
   looks at issues in the existing mechanism and then proposes a new
   query type, query by Remote ID, to address these issues.

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/rfc6148.

Kurapati, et al.             Standards Track                    [Page 1]
RFC 6148                   Query by Remote ID              February 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
   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
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   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Kurapati, et al.             Standards Track                    [Page 2]
RFC 6148                   Query by Remote ID              February 2011

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................4
   3. Motivation ......................................................6
   4. Protocol Details ................................................7
      4.1. Sending the DHCPLEASEQUERY Message .........................7
      4.2. Responding to the DHCPLEASEQUERY Message ...................8
      4.3. Building a DHCPLEASEACTIVE or DHCPLEASEUNKNOWN Message .....8
      4.4. Determining the IP Address to Be Used in Response ..........9
      4.5. Sending a DHCPLEASEACTIVE or DHCPLEASEUNKNOWN Message ......9
      4.6. Receiving a DHCPLEASEACTIVE or DHCPLEASEUNKNOWN Message ....9
      4.7. Receiving No Response to the DHCPLEASEQUERY Message .......10
      4.8. Lease-Binding Data Storage Requirements ...................10
      4.9. Using the DHCPLEASEQUERY Message with Multiple
           DHCP Servers ..............................................10
   5. RFC 4388 Considerations ........................................11
   6. Security Considerations ........................................11
   7. Acknowledgments ................................................11

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