RFC4030 - The Authentication Suboption for the Dynamic Host Configuration Protocol (DHCP) Relay Agent Option

• Network Working Group                                           M. Stapp
  Request for Comments: 4030                           Cisco Systems, Inc.
  Category: Standards Track                                      T. Lemon
                                                             Nominum, Inc.
                                                                March 2005
  
  
                   The Authentication Suboption for the
       Dynamic Host Configuration Protocol (DHCP) Relay Agent Option
  
  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.
  
  Copyright Notice
  
     Copyright (C) The Internet Society (2005).
  
  Abstract
  
     The Dynamic Host Configuration Protocol (DHCP) Relay Agent
     Information Option (RFC 3046) conveys information between a DHCP
     Relay Agent and a DHCP server.  This specification defines an
     authentication suboption for that option, containing a keyed hash in
     its payload.  The suboption supports data integrity and replay
     protection for relayed DHCP messages.
  
  Table of Contents
  
     1.  IntrodUCtion . . . . . . . . . . . . . . . . . . . . . . . .   2
     2.  Requirements Terminology . . . . . . . . . . . . . . . . . .   3
     3.  DHCP Terminology . . . . . . . . . . . . . . . . . . . . . .   4
     4.  Suboption Format . . . . . . . . . . . . . . . . . . . . . .   4
     5.  Replay Detection . . . . . . . . . . . . . . . . . . . . . .   5
     6.  The Relay Identifier Field . . . . . . . . . . . . . . . . .   5
     7.  Computing Authentication Information . . . . . . . . . . . .   6
         7.1.  The HMAC-SHA1 Algorithm  . . . . . . . . . . . . . . .   6
  
  

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