Dynamic Host Configuration (dhc)
--------------------------------

 Charter
 Last Modified: 2008-08-21

 Current Status: Active Working Group

 Chair(s):
     Ralph Droms  <rdroms@cisco.com>
     John Jason Brzozowski  <john_brzozowski@cable.comcast.com>

 Internet Area Director(s):
     Jari Arkko  <jari.arkko@piuha.net>
     Mark Townsley  <townsley@cisco.com>

 Internet Area Advisor:
     Jari Arkko  <jari.arkko@piuha.net>

 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) 

   Done         Submit 'Detection of Network Attachment (DNA) in IPv4' to IESG 
                (draft-ietf-dhc-dna-ipv4) 

   Done         Resolve IPR issues around 'Rapid Commit Option for DHCPv4' 

   Done         Publish report on dual-stack issues in DHCP 
                (draft-ietf-dhc-dual-stack) 

   Done         Publish report on requirements for renumbering using stateless 
                DHCPv6 (draft-ietf-dhc-stateless-dhcpv6-renumbering) 

   Done         Submit 'Lifetime Option for DHCPv6' to IESG 
                (draft-ietf-dhc-lifetime) 

   Done         Submit 'Rapid Commit Option for DHCPv4' to IESG 
                (draft-ietf-dhc-rapid-commit-opt) 

   Done         Submit DDNS/DHCP documents to IESG 

   Done         Submit 'Node-Specific Client Identifiers for DHCPv4' to IESG 
                (draft-ietf-dhc-3315id-for-v4) 

   Done         WG last call for 'Subnet Allocation Option' 
                <draft-ietf-dhc-subnet-alloc-04> 

   Done         WG last call on 'Virtual Subnet Selection Option', 
                <draft-ietf-dhc-vpn-option> 

   Oct 2007       Submit 'Subnet Allocation Option' 
                <draft-ietf-dhc-subnet-alloc-04> to IESG for Proposed Standard 

   Nov 2007       WG last call on 'Guidelines for Creating New DHCP Options' 
                <draft-ietf-dhc-option-guidelines> 

   Nov 2007       Submit 'Virtual Subnet Selection Option', 
                <draft-ietf-dhc-vpn-option> and <draft-ietf-dhc-agent-vpn-id> 
                to IESG for Proposed Standard 

   Dec 2007       WG last call for 'Domain Suffix Option for DHCPv6' 
                <draft-ietf-dhc-dhcpv6-opt-dnsdomain> 

   Jan 2008       Submit 'Domain Suffix Option for DHCPv6' 
                <draft-ietf-dhc-dhcpv6-opt-dnsdomain> to IESG for Proposed 
                Standard 

   Jan 2008       Submit 'Guidelines for Creating New DHCP Options' 
                <draft-ietf-dhc-option-guidelines> to IESG for Best Current 
                Practice 

   Jan 2008       Develop plan for advancing DHCPv4 and DHCPv6 plan to include 
                completion of DHCPv4 specification review report, 
                'Implementation Issues with RFC 2131' 
                <draft-ietf-dhc-implementation-02> for Informational 

   Feb 2008       WG last call for 'Status of Reclassifying DHCPv4 Options' 
                <draft-ietf-dhc-status-3942-00> 

   Feb 2008       WG last call for 'Dual-stack clients and merging of data from 
                DHCPv4 and DHCPv6' <draft-ietf-dhc-dual-stack-merge-01.txt>; 
                waiting for more experience with IPv6 deployment 

   Feb 2008       WG last call for 'Rebind Capability in DHCPv6 Reconfigure 
                Messages' <draft-ietf-dhc-dhcpv6-reconfigure-rebind-00> 

   Mar 2008       Submit 'Status of Reclassifying DHCPv4 Options' 
                <draft-ietf-dhc-status-3942-00> to IESG for Informational 

   Apr 2008       WG last call for 'DHCP Relay Agent Assignment Notification 
                Option <draft-ietf-dhc-dhcpv6-agentopt-delegate-01> and 'DHCPv6 
                Server Reply Sequence Number Option' 
                <draft-ietf-dhc-dhcpv6-srsn-option-00> 

   May 2008       Submit 'Rebind Capability in DHCPv6 Reconfigure Messages' 
                <draft-ietf-dhc-dhcpv6-reconfigure-rebind-00> to IESG for 
                Proposed Standard 

   Jun 2008       WG last call on 'Layer 2 Relay Agent Behaviour' 
                <draft-ietf-dhc-layer2-relay-agent-00> 

   Jul 2008       Submit 'Layer 2 Relay Agent Behaviour' to IESG 
                <draft-ietf-dhc-layer2-relay-agent-00> for Informational 

   Jul 2008       Submit 'DHCP Relay Agent Assignment Notification Option' 
                <draft-ietf-dhc-dhcpv6-agentopt-delegate-01> and 'DHCPv6 Server 
                Reply Sequence Number Option' 
                <draft-ietf-dhc-dhcpv6-srsn-option-00> to IESG for Proposed 
                Standard 

   Jul 2008       Recharter, if needed 


 Internet-Drafts:

Posted Revised         I-D Title   <Filename>
------ ------- --------------------------------------------
Jul 2001 Jul 2008   <draft-ietf-dhc-vpn-option-09.txt>
                Virtual Subnet Selection Options for DHCPv4 and DHCPv6 

Feb 2003 Jul 2008   <draft-ietf-dhc-subnet-alloc-07.txt>
                Subnet Allocation Option 

Aug 2006 Sep 2008   <draft-ietf-dhc-dhcpv6-reconfigure-rebind-04.txt>
                Rebind Capability in DHCPv6 Reconfigure Messages 

Sep 2007 Sep 2008   <draft-ietf-dhc-option-guidelines-02.txt>
                Guidelines for Creating New DHCP Options 

Jan 2008 Sep 2008   <draft-ietf-dhc-container-opt-01.txt>
                Container Option for Server Configuration 

Jan 2008 Oct 2008   <draft-ietf-dhc-l2ra-02.txt>
                Layer 2 Relay Agent Information 

Feb 2008 Jun 2008   <draft-ietf-dhc-dhcpv6-bulk-leasequery-03.txt>
                DHCPv6 Bulk Leasequery 

Jun 2008 Jun 2008   <draft-ietf-dhc-l2ra-extensions-00.txt>
                Extensions to Layer 2 Relay Agent 

Jun 2008 Sep 2008   <draft-ietf-dhc-relay-id-suboption-04.txt>
                The DHCPv4 Relay Agent Identifier Suboption 

Aug 2008 Aug 2008   <draft-ietf-dhc-dhcpv6-opt-netboot-00.txt>
                DHCPv6 option for network boot 

 Request For Comments:

  RFC   Stat Published     Title
------- -- ----------- ------------------------------------
RFC1531 PS   Oct 1993    Dynamic Host Configuration Protocol 

RFC1532 PS   Oct 1993    Clarifications and Extensions for the Bootstrap Protocol 

RFC1534 DS   Oct 1993    Interoperation Between DHCP and BOOTP 

RFC1533 PS   Oct 1993    DHCP Options and BOOTP Vendor Extensions 

RFC1542 DS   Oct 1993    Clarifications and Extensions for the Bootstrap Protocol 

RFC1541 PS   Oct 1993    Dynamic Host Configuration Protocol 

RFC2131 DS   Apr 1997    Dynamic Host Configuration Protocol 

RFC2132 DS   Apr 1997    DHCP Options and BOOTP Vendor Extensions 

RFC2242 PS   Nov 1997    Netware/IP Domain Name and Information 

RFC2241 PS   Nov 1997    DHCP Options for Novell Directory Services 

RFC2485 PS   Jan 1999    DHCP Option for The Open Group's User Authentication 
                       Protocol 

RFC2489BCP  Jan 1999    Procedure for Defining New DHCP Options 

RFC2563 PS   May 1999    DHCP Option to Disable Stateless Auto-Configuration in 
                       IPv4 Clients 

RFC2610 PS   Jun 1999    DHCP Options for Service Location Protocol 

RFC2939BCP  Oct 2000    Procedure for Defining New DHCP Options and Message 
                       Types 

RFC2937 PS   Oct 2000    The Name Service Search Option for DHCP 

RFC3011 PS   Dec 2000    The Subnet Selection Option for DHCP 

RFC3004 PS   Dec 2000    The User Class Option for DHCP 

RFC3046 PS   Feb 2001    DHCP Relay Agent Information Option 

RFC3074 PS   Mar 2001    DHC load balancing algorithm 

RFC3118 PS   Jun 2001    Authentication for DHCP Messages 

RFC3203 PS   Dec 2001    DHCP reconfigure extension 

RFC3256 PS   Apr 2002    The DOCSIS Device Class DHCP Relay Agent Information 
                       Sub-option 

RFC3396 PS   Nov 2002    Encoding Long Options in DHCPv4 

RFC3442 PS   Dec 2002    The Classless Static Route Option for Dynamic Host 
                       Configuration Protocol (DHCP) version 4 

RFC3495 PS   Mar 2003    Dynamic Host Configuration Protocol (DHCP) Option for 
                       CableLabs Client Configuration 

RFC3527 PS   Apr 2003    Link Selection sub-option for the Relay Agent 
                       Information Option for DHCPv4 

RFC3315 PS   Jul 2003    Dynamic Host Configuration Protocol for IPv6 (DHCPv6) 

RFC3594 PS   Sep 2003    PacketCable Security Ticket Control Sub-option for the 
                       the DHCP CableLabs Client Configuration (CCC)Option 

RFC3646Standard  Dec 2003    DNS Configuration Options for DHCPv6 

RFC3633Standard  Dec 2003    IPv6 Prefix Options for DHCPv6 

RFC3634Standard  Jan 2004    KDC Server Address Sub-option 

RFC3679 I    Jan 2004    Unused DHCP Option Codes 

RFC3736Standard  Apr 2004    Stateless DHCP Service for IPv6 

RFC3898Standard  Oct 2004    NIS Configuration Options for DHCPv6 

RFC3925Standard  Nov 2004    Vendor-Identifying Vendor Options for DHCPv4 

RFC3942Standard  Dec 2004    Reclassifying DHCPv4 Options 

RFC4014Standard  Feb 2005    RADIUS Attributes Sub-option for the DHCP Relay Agent 
                       Information Option 

RFC3993Standard  Mar 2005    DHCP Subscriber ID Suboption for the DHCP Relay Agent 
                       Option 

RFC4039Standard  Apr 2005    Rapid Commit Option for the Dynamic Host Configuration 
                       Protocol version 4 (DHCPv4) 

RFC4030Standard  Apr 2005    The Authentication Suboption for the DHCP Relay Agent 
                       Option 

RFC4075Standard  May 2005    Simple Network Time Protocol (SNTP) Configuration Option 
                       for DHCPv6 

RFC4076 I    May 2005    Renumbering Requirements for Stateless Dynamic Host 
                       Configuration Protocol for IPv6 (DHCPv6) 

RFC4174Standard  Sep 2005    The IPv4 Dynamic Host Configuration Protocol (DHCP) 
                       Options for the Internet Storage Name Service 

RFC4242Standard  Dec 2005    Information Refresh Time Option for Dynamic Host 
                       Configuration Protocol for IPv6 (DHCPv6) 

RFC4280Standard  Dec 2005    Dynamic Host Configuration Protocol (DHCP) Options for 
                       Broadcast and Multicast Control Servers 

RFC4243Standard  Dec 2005    Vendor-Specific Information Suboption for the Dynamic 
                       Host Configuration Protocol (DHCP) Relay Agent Option 

RFC4361Standard  Feb 2006    Node-Specific Client Identifiers for Dynamic Host 
                       Configuration Protocol Version Four (DHCPv4) 

RFC4388 PS   Feb 2006    Dynamic Host Configuration Protocol (DHCP) Leasequery 

RFC4436 PS   Mar 2006    Detecting Network Attachment in IPv4 (DNAv4) 

RFC4477 I    May 2006    Dynamic Host Configuration Protocol (DHCP): IPv4 and 
                       IPv6 Dual-Stack Issues 

RFC4580 PS   Jun 2006    Dynamic Host Configuration Protocol for IPv6 (DHCPv6) 
                       Relay Agent Subscriber-ID Option 

RFC4649 PS   Aug 2006    Dynamic Host Configuration Protocol for IPv6 (DHCPv6) 
                       Relay Agent Remote-ID Option 

RFC4704 PS   Oct 2006    The Dynamic Host Configuration Protocol for IPv6 
                       (DHCPv6) Client Fully Qualified Domain Name (FQDN) 
                       Option 

RFC4703 PS   Oct 2006    Resolution of Fully Qualified Domain Name (FQDN) 
                       Conflicts among Dynamic Host Configuration Protocol 
                       (DHCP) Clients 

RFC4702 PS   Oct 2006    The Dynamic Host Configuration Protocol (DHCP) Client 
                       Fully Qualified Domain Name (FQDN) Option 

RFC4578 I    Nov 2006    Dynamic Host Configuration Protocol (DHCP) Options for 
                       the Intel Preboot eXecution Environment (PXE) 

RFC4833 PS   Apr 2007    A Timezone Option for DHCP 

RFC5010 PS   Sep 2007    The Dynamic Host Configuration Protocol Version 4 
                       (DHCPv4) Relay Agent Flags Suboption 

RFC5007 PS   Sep 2007    DHCPv6 Leasequery 

RFC4994 PS   Sep 2007    DHCPv6 Relay Agent Echo Request Option 

RFC5071 I    Dec 2007    Dynamic Host Configuration Protocol Options Used by 
                       PXELINUX 

RFC5107 PS   Feb 2008    DHCP Server Identifier Override Suboption 

RFC5192 PS   May 2008    DHCP Options for Protocol for Carrying Authentication 
                       for Network Access (PANA) Authentication Agents