draft-ietf-dhc-dhcpv6-28.txt

DHCPv6协议在Linux操作系统下的一个客户端实现。

Internet Engineering Task Force                    R. Droms (ed.), Cisco
INTERNET DRAFT                                 J. Bound, Hewlett Packard
DHC Working Group                                  Bernie Volz, Ericsson
Obsoletes:  draft-ietf-dhc-dhcpv6-27.txt              Ted Lemon, Nominum
                                       C. Perkins, Nokia Research Center
                                             M. Carney, Sun Microsystems
                                                              2 Nov 2002


         Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
                      draft-ietf-dhc-dhcpv6-28.txt


Status of This Memo

   This document is a submission by the Dynamic Host Configuration
   Working Group of the Internet Engineering Task Force (IETF). Comments
   should be submitted to the [e-mail] mailing list.

   Distribution of this memo is unlimited.

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.  Internet-Drafts are working
   documents of the Internet Engineering Task Force (IETF), its areas,
   and its working groups.  Note that other groups may also distribute
   working documents as Internet-Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at
   any time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

    The list of current Internet-Drafts can be accessed at:
         http://www.ietf.org/ietf/1id-abstracts.txt
    The list of Internet-Draft Shadow Directories can be accessed at:
         http://www.ietf.org/shadow.html.



Abstract

   The Dynamic Host Configuration Protocol for IPv6 (DHCP) enables
   DHCP servers to pass configuration parameters such as IPv6 network
   addresses to IPv6 nodes.  It offers the capability of automatic
   allocation of reusable network addresses and additional configuration
   flexibility.  This protocol is a stateful counterpart to "IPv6
   Stateless Address Autoconfiguration" (RFC2462), and can be used
   separately or concurrently with the latter to obtain configuration
   parameters.










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                                Contents


Status of This Memo                                                    i

Abstract                                                               i

 1. Introduction and Overview                                          1
     1.1. Protocols and Addressing  . . . . . . . . . . . . . . . .    1
     1.2. Client-server Exchanges Involving Two Messages  . . . . .    2
     1.3. Client-server Exchanges Involving Four Messages . . . . .    2

 2. Requirements                                                       3

 3. Background                                                         3

 4. Terminology                                                        4
     4.1. IPv6 Terminology  . . . . . . . . . . . . . . . . . . . .    4
     4.2. DHCP Terminology  . . . . . . . . . . . . . . . . . . . .    5

 5. DHCP Constants                                                     7
     5.1. Multicast Addresses . . . . . . . . . . . . . . . . . . .    7
     5.2. UDP Ports . . . . . . . . . . . . . . . . . . . . . . . .    8
     5.3. DHCP Message Types  . . . . . . . . . . . . . . . . . . .    8
     5.4. Status Codes  . . . . . . . . . . . . . . . . . . . . . .   10
     5.5. Transmission and Retransmission Parameters  . . . . . . .   10

 6. Client/Server Message Formats                                     11

 7. Relay Agent/Server Message Formats                                11
     7.1. Relay-forward Message . . . . . . . . . . . . . . . . . .   12
     7.2. Relay-reply Message . . . . . . . . . . . . . . . . . . .   13

 8. Representation and Use of Domain Names                            13

 9. DHCP Unique Identifier (DUID)                                     13
     9.1. DUID Contents . . . . . . . . . . . . . . . . . . . . . .   14
     9.2. DUID Based on Link-layer Address Plus Time [DUID-LLT] . .   14
     9.3. DUID Assigned by Vendor Based on Enterprise Number
             [DUID-EN]  . . . . . . . . . . . . . . . . . . . . . .   15
     9.4. DUID Based on Link-layer Address [DUID-LL]  . . . . . . .   16

10. Identity Association                                              17

11. Selecting Addresses for Assignment to an IA                       17

12. Management of Temporary Addresses                                 18

13. Transmission of Messages by a Client                              19

14. Reliability of Client Initiated Message Exchanges                 19

15. Message Validation                                                21



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    15.1. Use of Transaction IDs  . . . . . . . . . . . . . . . . .   21
    15.2. Solicit Message . . . . . . . . . . . . . . . . . . . . .   21
    15.3. Advertise Message . . . . . . . . . . . . . . . . . . . .   21
    15.4. Request Message . . . . . . . . . . . . . . . . . . . . .   22
    15.5. Confirm Message . . . . . . . . . . . . . . . . . . . . .   22
    15.6. Renew Message . . . . . . . . . . . . . . . . . . . . . .   22
    15.7. Rebind Message  . . . . . . . . . . . . . . . . . . . . .   22
    15.8. Decline Messages  . . . . . . . . . . . . . . . . . . . .   23
    15.9. Release Message . . . . . . . . . . . . . . . . . . . . .   23
   15.10. Reply Message . . . . . . . . . . . . . . . . . . . . . .   23
   15.11. Reconfigure Message . . . . . . . . . . . . . . . . . . .   24
   15.12. Information-request Message . . . . . . . . . . . . . . .   24
   15.13. Relay-forward Message . . . . . . . . . . . . . . . . . .   24
   15.14. Relay-reply Message . . . . . . . . . . . . . . . . . . .   24

16. Client Source Address and Interface Selection                     25

17. DHCP Server Solicitation                                          25
    17.1. Client Behavior . . . . . . . . . . . . . . . . . . . . .   25
          17.1.1. Creation of Solicit Messages  . . . . . . . . . .   25
          17.1.2. Transmission of Solicit Messages  . . . . . . . .   26
          17.1.3. Receipt of Advertise Messages . . . . . . . . . .   27
          17.1.4. Receipt of Reply Message  . . . . . . . . . . . .   28
    17.2. Server Behavior . . . . . . . . . . . . . . . . . . . . .   28
          17.2.1. Receipt of Solicit Messages . . . . . . . . . . .   28
          17.2.2. Creation and Transmission of Advertise Messages .   29
          17.2.3. Creation and Transmission of Reply Messages . . .   30

18. DHCP Client-Initiated Configuration Exchange                      31
    18.1. Client Behavior . . . . . . . . . . . . . . . . . . . . .   31
          18.1.1. Creation and Transmission of Request Messages . .   31
          18.1.2. Creation and Transmission of Confirm Messages . .   32
          18.1.3. Creation and Transmission of Renew Messages . . .   33
          18.1.4. Creation and Transmission of Rebind Messages  . .   34
          18.1.5. Creation and Transmission of Information-request
                          Messages . . . . . . . . . . . . . . . . .  35
          18.1.6. Creation and Transmission of Release Messages . .   36
          18.1.7. Creation and Transmission of Decline Messages . .   37
          18.1.8. Receipt of Reply Messages . . . . . . . . . . . .   38
    18.2. Server Behavior . . . . . . . . . . . . . . . . . . . . .   39
          18.2.1. Receipt of Request Messages . . . . . . . . . . .   40
          18.2.2. Receipt of Confirm Messages . . . . . . . . . . .   41
          18.2.3. Receipt of Renew Messages . . . . . . . . . . . .   41
          18.2.4. Receipt of Rebind Messages  . . . . . . . . . . .   42
          18.2.5. Receipt of Information-request Messages . . . . .   42
          18.2.6. Receipt of Release Messages . . . . . . . . . . .   43
          18.2.7. Receipt of Decline Messages . . . . . . . . . . .   44
          18.2.8. Transmission of Reply Messages  . . . . . . . . .   44

19. DHCP Server-Initiated Configuration Exchange                      45
    19.1. Server Behavior . . . . . . . . . . . . . . . . . . . . .   45
          19.1.1. Creation and Transmission of Reconfigure Messages   45




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          19.1.2. Time Out and Retransmission of Reconfigure
                          Messages . . . . . . . . . . . . . . . . .  46
    19.2. Receipt of Renew Messages . . . . . . . . . . . . . . . .   46
    19.3. Receipt of Information-request Messages . . . . . . . . .   46
    19.4. Client Behavior . . . . . . . . . . . . . . . . . . . . .   47
          19.4.1. Receipt of Reconfigure Messages . . . . . . . . .   47
          19.4.2. Creation and Transmission of Renew Messages . . .   48
          19.4.3. Creation and Transmission of Information-request
                          Messages . . . . . . . . . . . . . . . . .  48
          19.4.4. Time Out and Retransmission of Renew or
                          Information-request Messages . . . . . . .  48
          19.4.5. Receipt of Reply Messages . . . . . . . . . . . .   48

20. Relay Agent Behavior                                              48
    20.1. Relaying a Client Message or a Relay-forward Message  . .   49
          20.1.1. Relaying a Message from a Client  . . . . . . . .   49
          20.1.2. Relaying a Message from a Relay Agent . . . . . .   49
    20.2. Relaying a Relay-reply Message  . . . . . . . . . . . . .   50
    20.3. Construction of Relay-reply Messages  . . . . . . . . . .   50

21. Authentication of DHCP Messages                                   51
    21.1. Security of Messages Sent Between Servers and Relay Agents  51
    21.2. Summary of DHCP Authentication  . . . . . . . . . . . . .   52
    21.3. Replay Detection  . . . . . . . . . . . . . . . . . . . .   53
    21.4. Delayed Authentication Protocol . . . . . . . . . . . . .   53
          21.4.1. Use of the Authentication Option in the Delayed
                          Authentication Protocol  . . . . . . . . .  53
          21.4.2. Message Validation  . . . . . . . . . . . . . . .   54
          21.4.3. Key Utilization . . . . . . . . . . . . . . . . .   55
          21.4.4. Client Considerations for Delayed Authentication
                          Protocol . . . . . . . . . . . . . . . . .  55
          21.4.5. Server Considerations for Delayed Authentication
                          Protocol . . . . . . . . . . . . . . . . .  57
    21.5. Reconfigure Key Authentication Protocol . . . . . . . . .   57
          21.5.1. Use of the Authentication Option in the Reconfigure
                          Key Authentication Protocol  . . . . . . .  58
          21.5.2. Server considerations for Reconfigure Key protocol  58
          21.5.3. Client considerations for Reconfigure Key protocol  59

22. DHCP Options                                                      59
    22.1. Format of DHCP Options  . . . . . . . . . . . . . . . . .   60
    22.2. Client Identifier Option  . . . . . . . . . . . . . . . .   60
    22.3. Server Identifier Option  . . . . . . . . . . . . . . . .   61
    22.4. Identity Association for Non-temporary Addresses Option .   61
    22.5. Identity Association for Temporary Addresses Option . . .   63
    22.6. IA Address Option . . . . . . . . . . . . . . . . . . . .   65
    22.7. Option Request Option . . . . . . . . . . . . . . . . . .   66
    22.8. Preference Option . . . . . . . . . . . . . . . . . . . .   66
    22.9. Elapsed Time Option . . . . . . . . . . . . . . . . . . .   67
   22.10. Relay Message Option  . . . . . . . . . . . . . . . . . .   68
   22.11. Authentication Option . . . . . . . . . . . . . . . . . .   68
   22.12. Server Unicast Option . . . . . . . . . . . . . . . . . .   69
   22.13. Status Code Option  . . . . . . . . . . . . . . . . . . .   70



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   22.14. Rapid Commit Option . . . . . . . . . . . . . . . . . . .   71
   22.15. User Class Option . . . . . . . . . . . . . . . . . . . .   71
   22.16. Vendor Class Option . . . . . . . . . . . . . . . . . . .   73
   22.17. Vendor-specific Information Option  . . . . . . . . . . .   73
   22.18. Interface-Id Option . . . . . . . . . . . . . . . . . . .   75
   22.19. Reconfigure Message Option  . . . . . . . . . . . . . . .   76
   22.20. Reconfigure Accept Option . . . . . . . . . . . . . . . .   76

23. Security Considerations                                           77

24. IANA Considerations                                               78
    24.1. Multicast Addresses . . . . . . . . . . . . . . . . . . .   79
    24.2. DHCP Message Types  . . . . . . . . . . . . . . . . . . .   79
    24.3. DHCP Options  . . . . . . . . . . . . . . . . . . . . . .   80
    24.4. Status Codes  . . . . . . . . . . . . . . . . . . . . . .   81
    24.5. DUID  . . . . . . . . . . . . . . . . . . . . . . . . . .   81

25. Acknowledgments                                                   82

26. Changes in draft-ietf-dhc-dhcpv6-27.txt                           82

27. Changes in draft-ietf-dhc-dhcpv6-28.txt                           83

References                                                            84

Chair's Address                                                       85

Authors' Addresses                                                    86

 A. Appearance of Options in Message Types                            87

 B. Appearance of Options in the Options Field of DHCP Options        87

 C. Full Copyright Statement                                          88