2.3.4 Dynamic Host Configuration (dhc)

NOTE: This charter is a snapshot of the 64th IETF Meeting in Vancouver, British Columbia Canada. It may now be out-of-date.
In addition to this official charter maintained by the IETF Secretariat, there is additional information about this working group on the Web at:

       Additional DHC Page

Last Modified: 2005-09-28

Chair(s):

Ralph Droms <rdroms@cisco.com>
Stig Venaas <venaas@uninett.no>

Internet Area Director(s):

Mark Townsley <townsley@cisco.com>
Margaret Wasserman <margaret@thingmagic.com>

Internet Area Advisor:

Margaret Wasserman <margaret@thingmagic.com>

Mailing Lists:

General Discussion: dhcwg@ietf.org
To Subscribe: http://www1.ietf.org/mailman/listinfo/dhcwg
Archive: http://www.ietf.org/mail-archive/web/dhcwg/index.html

Description of Working Group:

The dhc working group (DHC WG) has developed DHCP for automated
allocation, configuration and management of IP addresses and TCP/IP
protocol stack parameters. DHCPv4 is currently a "Draft Standard" and
is documented in RFC 2131 and RFC 2132. DHCPv6 is currently a
"Proposed Standard" and is documented in RFC 3315. Subsequent RFCs
document additional options and other enhancements to the
specifications.

The DHC WG is responsible for reviewing (and sometimes developing)
DHCP options or other extensions (for both IPv4 and IPv6). The DHC WG
is expected to review all proposed extensions to DHCP to ensure that
they are consistent with the DHCP specification and other option
formats, that they do not duplicate existing mechanisms, etc. The DHC
WG will not (generally) be responsible for evaluating the semantic
content of proposed options. The DHC WG will not adopt new proposals
for extensions to DHCP as working group documents without first
coordinating with other relevant working groups and determining who
has the responsibility for reviewing the semantic content of an
option.

The DHC WG has the following main objectives:

* Address security in DHCP

o Develop and document security requirements for DHCP. RFC 3118
defines current security mechanisms for DHCPv4. Unfortunately,
RFC 3118 has neither been implemented nor deployed to date.
Specific issues to be considered include:

- Improved key management and scalability

- Security for messages passed between relay agents and servers

- Threats of DoS attacks through DHCPFORCERENEW

- The increased usage of DHC on unsecured (e.g., wireless) and
public LANs

- The need for clients to be able to authenticate servers, without
simultaneously requiring client authentication by the server.

o Develop and document a roadmap of any new documents or protocols
needed to meet the security requirements for DHCP

* Write an analysis of the DHCP specification, including RFC 2131,
RFC 2132 and other RFCs defining additional options, which
identifies ambiguities, contradictory specifications and other
obstacles to development of interoperable implementations. Recommend
a process for resolving identified problems and incorporating the
resolutions into the DHCP specification.

* Assess the requirements for a dual-stack host to use DHCP to obtain
configuration settings for both IPv4 and IPv6. Hosts that include
implementations of both IPv4 and IPv6 ("dual-stack hosts") may use
DHCP to obtain configuration settings (including assigned addresses)
for both IPv4 and IPv6. The DHCPv4 and DHCPv6 specifications (RFC
2131, RFC 2132, RFC 3315 and subsequent RFCs) do not explicitly
explain how a dual-stack host uses DHCP to obtain configuration
settings for both IP stacks. The DHC WG will evaluate solutions for
configuration of dual-stack hosts through DHCP and select a solution
that will be developed and published by the WG.

* Assess the requirements for informing DHCPv6 clients of changes in
configuration information. The DHCPv6 specification in RFC 3315
includes a mechanism through which clients can obtain other
configuration information without obtaining an address or addresses.
This mechanisms is sometimes called "stateless DHCPv6" and is
specified in RFC 3736. RFC 3315 includes no provision for notifying
DHCPv6 clients using stateless DHCPv6 of changes in the
configuration information supplied to the client or any
recommendations as to when a client should obtain possibly updated
information. The DHC WG will evaluate solutions for informing
DHCPv6 clients of changes in configuration information and select a
solution that will be developed and published by the WG.

Goals and Milestones:

Done  WG Last Call on DHCP Options for Internet Storage Name Service (draft-ietf-dhc-isnsoption-03.txt)
Done  WG Last Call on Load Balancing for DHCPv6 (draft-ietf-dhc-dhcpv6-loadb-02.txt)
Done  WG Last Call on Time Configuration Options for DHCPv6 (draft-ietf-dhc-dhcpv6-opt-timeconfig-01.txt)
Done  WG Last Call on IPv6 Prefix Options for DHCPv6 (draft-troan-dhcpv6-opt-prefix-delegation-02.txt)
Done  WG Last Call on DNS Configuration options for DHCPv6 (draft-ietf-dhc-dhcpv6-opt-dnsconfig-01.txt)
Done  WG Last Call on NIS Configuration Options for DHCPv6 (draft-ietf-dhc-dhcpv6-opt-nisconfig-01.txt)
Done  Resubmit draft-ietf-dhc-dhcpv6-28.txt to IESG
Done  Identify DHCPv4 authentication design team
Done  Identify DHCPv4 specification review design team
Done  Identify DHCPv4 relay agent message authentication design team
Done  Submit DHCP Options for Internet Storage Name Service to IESG (draft-ietf-dhc-isnsoption)
Done  Submit DNS Configuration options for DHCPv6 to IESG (draft-ietf-dhc-dhcpv6-opt-dnsconfig)
Done  Submit NIS Configuratio Options for DHCPv6 to IESG (draft-ietf-dhc-dhcpv6-opt-nisconfig)
Done  Submit IPv6 Prefix Options for DHCPv6 to IESG (draft-troan-dhcpv6-opt-prefix-delegation)
Jul 2004  Submit 'Detection of Network Attachment (DNA) in IPv4' to IESG (draft-ietf-dhc-dna-ipv4)
Jul 2004  Resolve IPR issues around 'Rapid Commit Option for DHCPv4'
Aug 2004  Publish report on dual-stack issues in DHCP (draft-ietf-dhc-dual-stack)
Aug 2004  Publish report on requirements for renumbering using stateless DHCPv6 (draft-ietf-dhc-stateless-dhcpv6-renumbering)
Sep 2004  Submit 'Lifetime Option for DHCPv6' to IESG (draft-ietf-dhc-lifetime)
Sep 2004  DHCPv4 authentication design team report completed, 'Dynamic Host Configuration Protocol for IPv4 (DHCPv4) Threat Analysis'
Sep 2004  DHCPv4 specification review report completed
Sep 2004  Submit 'DHCP Failover Protocol' to IESG (draft-ietf-dhc-failover)
Sep 2004  Submit 'Rapid Commit Option for DHCPv4' to IESG (draft-ietf-dhc-rapid-commit-opt)
Dec 2004  Submit DDNS/DHCP documents to IESG
Dec 2004  Submit 'Node-Specific Client Identifiers for DHCPv4' to IESG (draft-ietf-dhc-3315id-for-v4)

Internet-Drafts:

  • draft-ietf-dhc-server-mib-10.txt
  • draft-ietf-dhc-fqdn-option-11.txt
  • draft-ietf-dhc-ddns-resolution-10.txt
  • draft-ietf-dhc-leasequery-09.txt
  • draft-ietf-dhc-vpn-option-05.txt
  • draft-ietf-dhc-server-override-03.txt
  • draft-ietf-dhc-subnet-alloc-03.txt
  • draft-ietf-dhc-dna-ipv4-17.txt
  • draft-ietf-dhc-relay-agent-ipsec-02.txt
  • draft-ietf-dhc-pxe-options-02.txt
  • draft-ietf-dhc-3315id-for-v4-05.txt
  • draft-ietf-dhc-proxyserver-opt-04.txt
  • draft-ietf-dhc-dhcpv6-ctep-opt-02.txt
  • draft-ietf-dhc-dual-stack-04.txt
  • draft-ietf-dhc-lifetime-03.txt
  • draft-ietf-dhc-vendor-suboption-00.txt
  • draft-ietf-dhc-dhcpv6-fqdn-03.txt
  • draft-ietf-dhc-v6-relay-radius-01.txt
  • draft-ietf-dhc-bcmc-options-05.txt
  • draft-ietf-dhc-dhcpv6-subid-00.txt
  • draft-ietf-dhc-dhcpv6-remoteid-00.txt
  • draft-ietf-dhc-dual-stack-merge-01.txt
  • draft-ietf-dhc-paa-option-00.txt
  • draft-ietf-dhc-dhcpv6-opt-dnsdomain-00.txt

    Request For Comments:

    RFCStatusTitle
    RFC1531 PS Dynamic Host Configuration Protocol
    RFC1532 PS Clarifications and Extensions for the Bootstrap Protocol
    RFC1533 PS DHCP Options and BOOTP Vendor Extensions
    RFC1534 DS Interoperation Between DHCP and BOOTP
    RFC1541 PS Dynamic Host Configuration Protocol
    RFC1542 DS Clarifications and Extensions for the Bootstrap Protocol
    RFC2131 DS Dynamic Host Configuration Protocol
    RFC2132 DS DHCP Options and BOOTP Vendor Extensions
    RFC2241 PS DHCP Options for Novell Directory Services
    RFC2242 PS Netware/IP Domain Name and Information
    RFC2485 PS DHCP Option for The Open Group's User Authentication Protocol
    RFC2489 BCP Procedure for Defining New DHCP Options
    RFC2563 PS DHCP Option to Disable Stateless Auto-Configuration in IPv4 Clients
    RFC2610 PS DHCP Options for Service Location Protocol
    RFC2937 PS The Name Service Search Option for DHCP
    RFC2939 BCP Procedure for Defining New DHCP Options and Message Types
    RFC3004 PS The User Class Option for DHCP
    RFC3011 PS The Subnet Selection Option for DHCP
    RFC3046 PS DHCP Relay Agent Information Option
    RFC3074 PS DHC load balancing algorithm
    RFC3118 PS Authentication for DHCP Messages
    RFC3203 PS DHCP reconfigure extension
    RFC3256 PS The DOCSIS Device Class DHCP Relay Agent Information Sub-option
    RFC3315 PS Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
    RFC3396 PS Encoding Long Options in DHCPv4
    RFC3442 PS The Classless Static Route Option for Dynamic Host Configuration Protocol (DHCP) version 4
    RFC3495 PS Dynamic Host Configuration Protocol (DHCP) Option for CableLabs Client Configuration
    RFC3527 PS Link Selection sub-option for the Relay Agent Information Option for DHCPv4
    RFC3594 PS PacketCable Security Ticket Control Sub-option for the the DHCP CableLabs Client Configuration (CCC)Option
    RFC3633 Standard IPv6 Prefix Options for DHCPv6
    RFC3634 Standard KDC Server Address Sub-option
    RFC3646 Standard DNS Configuration Options for DHCPv6
    RFC3679 I Unused DHCP Option Codes
    RFC3736 Standard Stateless DHCP Service for IPv6
    RFC3898 Standard NIS Configuration Options for DHCPv6
    RFC3925 Standard Vendor-Identifying Vendor Options for DHCPv4
    RFC3942 Standard Reclassifying DHCPv4 Options
    RFC3993 Standard DHCP Subscriber ID Suboption for the DHCP Relay Agent Option
    RFC4014 Standard RADIUS Attributes Sub-option for the DHCP Relay Agent Information Option
    RFC4030 Standard The Authentication Suboption for the DHCP Relay Agent Option
    RFC4039 Standard Rapid Commit Option for the Dynamic Host Configuration Protocol version 4 (DHCPv4)
    RFC4075 Standard Simple Network Time Protocol (SNTP) Configuration Option for DHCPv6
    RFC4076 I Renumbering Requirements for Stateless Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
    RFC4174 Standard The IPv4 Dynamic Host Configuration Protocol (DHCP) Options for the Internet Storage Name Service

    Current Meeting Report

    Administrivia                                      R. Droms
      Agenda bashing; blue sheets; scribe; Jabber scribe
    
    
    Report on TAHI DHCPv6 conformance testing tool     H. Enokihara
    
    Progress report from TAHI; next test event 2006-01
    
    
    Domain Suffix Option for DHCPv6                    R. Yan
      draft-ietf-dhc-dhcpv6-opt-dnsdomain-00.txt
    
    Ready for WG last call; will confirm on dhcwg mailing list
    
    
    Home Agent Configuration Option for DHCPv6         Y. Ma
      draft-yuchi-dhc-homeagent-option-00.txt
    
    Will coordinate with related drafts (and authors; e.g., kent Leung
    from Cisco); cairs will coordinate with mip6 WG chairs
    
    
    DHCP URI Option                                    J. Polk
      draft-polk-dhc-uri-02.txt
    
    Requires additional work before acceptance as dhc WG work item.
    
    
    Time Options for DHCPv6                            R. Droms
      draft-droms-dhc-dhcpv6-rfc868-servers-02.txt
    
    Consensus to take on as WG work item; will confirm on dhcwg mailing
    list
    
    
    DHCP Relay agent Request from Multi Address Pool   Z. Kang 
      draft-zi-dhc-agent-request-multi-pool-00.txt
    
    Purpose of new relay agent option not clear; may overlap with current
    "best practice" of configuring subnet topology in DHCP server.  Not
    ready for acceptance as dhc WG work item; WG members will review
    details with authors
    
    
    DHCP Option for CLF/NASSx                          L. Jun
      draft-lijun-dhc-clf-nass-option-01.txt
    
    Document still not clear as to what is being proposed as extension to
    DHCP;  not ready for acceptance as WG work item
    
    
    Passive Duplicate Address Detection for DHCP       H. Schulzrinne
      draft-forte-dhc-passive-dad-00.txt
    
    Henning to provide more detail in e-mail, esp. relative to node
    identification and router<->server transport; not ready for acceptance
    as WG work item
    
    
    Client merging of data from DHCPv[46]              T. Chown
      draft-ietf-dhc-dual-stack-merge-01.txt
    
    Minor revisions to doc; need to wait for more operational experience
    before advancing the document.
    
    
    DHCP Assignment Notification Option                B. Volz
      draft-droms-dhc-dhcpv6-agentopt-delegate-00.txt
    
    Consensus to take on as WG work item; will confirm on dhcwg mailing
    list
    
    
    DHCP Cluster                                       F. Bourdais
      draft-bourdais-dhcp-cluster-00.txt
    
    WG provided feedback about previous experience with distributed DB for
    managing address assignments; not ready for acceptance as WG work item
    

    Slides

    00-Agenda
    01-TAHI
    02-Domain_Suffix-Yan
    03-URI-Polk
    04-MIP-HA-Yuchi
    05-time-protocol-option
    06-Relay-agent-multi-address-pool
    07-DHCP Option for CLF/NASS
    09-Client_merging_of_data_from_DHCPv[46]
    10-Relay-Agent-Notification
    11-DHCP_Cluster-Bourdais