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Please unsubscribe this Email Address:

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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Dynamic Host Configuration Working Group of the IETF.

	Title		: IPv6 Prefix Options for DHCPv6
	Author(s)	: O. Troan, R. Droms
	Filename	: draft-ietf-dhc-dhcpv6-opt-prefix-delegation-01.txt
	Pages		: 18
	Date		: 2002-12-2
	
The Prefix Delegation options provide a mechanism for automated
delegation of IPv6 prefixes using DHCP.  This mechanism is intended
for delegating long-lived prefix from a delegating router to a
requesting router, across an administrative boundary, where the
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Hello,
 
I have two dhcp machines running on redhat 7.2 and I want to use the omshell
to inform the primary server that the second one will be down on day x. I'm
having trouble trying to find information on how to go about this.
 
If anyone could point me in the right direction I'd be very grateful.
 
Bernadette
 
----------------------------------------------------------------------------
-----------------------
Bernadette Boyle
b.boyle@gcal.ac.uk
0141 331 8822
----------------------------------------------------------------------------
--------------------------
 

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<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Hello,<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I have two <span class=3DSpellE>dhcp</span> machines =
running
on <span class=3DSpellE>redhat</span> 7.2 and I want to use the <span
class=3DSpellE>omshell</span> to inform the primary server that the =
second one
will be down on day x. I'm having trouble trying to find information on
how to go about this.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>If anyone could point me in the right direction I'd =
be
very grateful.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Bernadette<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

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face=3DArial><span
style=3D'font-size:7.5pt;font-family:Arial;color:gray;mso-no-proof:yes'>=
------------------------------------------------------------------------=
---------------------------</span></font></b></strong><span
style=3D'mso-no-proof:yes'><o:p></o:p></span></p>

<p class=3DMsoNormal><strong><b><font size=3D1 color=3Dgray =
face=3DArial><span
style=3D'font-size:7.5pt;font-family:Arial;color:gray;mso-no-proof:yes'>=
Bernadette
Boyle<o:p></o:p></span></font></b></strong></p>

<p class=3DMsoNormal><strong><b><font size=3D1 color=3Dgray =
face=3DArial><span
style=3D'font-size:7.5pt;font-family:Arial;color:gray;mso-no-proof:yes'>=
b.boyle@gcal.ac.uk</span></font></b></strong><span
style=3D'mso-no-proof:yes'><o:p></o:p></span></p>

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face=3DArial><span
style=3D'font-size:7.5pt;font-family:Arial;color:gray;mso-no-proof:yes'>=
0141 331
8822</span></font></b></strong><span =
style=3D'mso-no-proof:yes'><o:p></o:p></span></p>

<p class=3DMsoNormal><strong><b><font size=3D1 color=3Dgray =
face=3DArial><span
style=3D'font-size:7.5pt;font-family:Arial;color:gray;mso-no-proof:yes'>=
------------------------------------------------------------------------=
------------------------------</span></font></b></strong><o:p></o:p></p>=


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style=3D'font-size:
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From dhcwg-admin@ietf.org  Sat Dec  7 13:41:41 2002
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From: Thamer Al-Harbash <tmh@whitefang.com>
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Subject: [dhcwg] rfc2131 and releasing leases
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Hi,

I understand under rfc2131 that there is no way to acknowledge a
release from a DHCP client. Are there any extensions, or any plans
on incorporating a release acknowledgement?

Problem:

Client sends DHCP release. Client shuts down.

Server doesn't get the release datagram because it was dropped
before it reached the Server. The server holds onto the lease.

How is this scenario avoided by the server if no acknowledgement is
ever sent to the client? The problem becomes worse when the client
machine reboots to another OS and tries to acquire the same lease
with a different client-id.

-- 
Thamer Al-Harbash            http://www.whitefang.com/
          team dresch made me do it

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--=====================_17384597==_.ALT
Content-Type: text/plain; charset="us-ascii"; format=flowed

FYI...The IESG has requested changes in two sections of 
draft-ietf-dhc-dhcpv6-28.txt, prior to its acceptance as a Proposed 
Standard and publication as an RFC.  The changes are noted in the text 
included below from sections 21.1 and 23.  The change is motivated by the 
observation that manual keying does not prevent replay attacks.

The sentence identified in the first paragraph of 21.1 will be 
removed.  The list item labeled "Key Management" will be replaced with the 
text shown below.  The previous text mentioned only manual keying.  The 
indicated (last) paragraph in section 23 will be added.

- Ralph

=====

21.1. Security of Messages Sent Between Servers and Relay Agents

    Relay agents and servers that exchange messages securely use the
|  IPsec mechanisms for IPv6 [11].  Relay agents and servers MUST
|  support manual configuration and installation of static keys.  If
|  a client message is relayed through multiple relay agents, each of
    the relay agents must have established independent, pairwise trust
    relationships.  That is, if messages from client C will be relayed by
    relay agent A to relay agent B and then to the server, relay agents A
    and B must be configured to use IPSec for the messages they exchange,
    and relay agent B and the server must be configured to use IPSec for
    the messages they exchange.

    Relay agents and servers that support secure relay agent to server
    or relay agent to relay agent communication use IPsec under the
    following conditions:

       Selectors        Relay agents are manually configured with the
                        addresses of the relay agent or server to which
                        DHCP messages are to be forwarded.  Each relay
                        agent and server that will be using IPsec for
                        securing DHCP messages must also be configured
                        with a list of the relay agents to which messages
                        will be returned.  The selectors for the relay
                        agents and servers will be the pairs of addresses
                        defining relay agents and servers that exchange
                        DHCP messages on the DHCPv6 UDP ports 546 and
                        547.

       Mode             Relay agents and servers use transport mode and
                        ESP. The information in DHCP messages is not
                        generally considered confidential, so encryption
                        need not be used (i.e., NULL encryption can be
                        used).

|     Key management   Because the relay agents and servers are used
|                      within an organization, public key schemes are
|                      not necessary.  Because the relay agents and
|                      servers must be manually configured, manually
|                      configured key management may suffice, but
|                      doesn't provide defense against replayed
|                      messages.  Accordingly, IKE with preshared
|                      secrets SHOULD be supported.  IKE with public
|                      keys MAY be supported.

       Security policy  DHCP messages between relay agents and servers
                        should only be accepted from DHCP peers as
                        identified in the local configuration.

       Authentication   Shared keys, indexed to the source IP address of
                        the received DHCP message, are adequate in this
                        application.

       Availability     Appropriate IPsec implementations are likely to
                        be available for servers and for relay agents in
                        more featureful devices used in enterprise and
                        core ISP networks.  IPsec is less likely to be
                        available for relay agents in low end devices
                        primarily used in the home or small office
                        markets.

23. Security Considerations
    [...]

    Communication between a server and a relay agent and communication
    between relay agents can be secured through the use of IPSec, as
    described in section 21.1.  The use of manual configuration and
    installation of static keys are acceptable in this instance because
    relay agents and the server will belong to the same administrative
    domain and the relay agents will require other specific configuration
    (for example, configuration of the DHCP server address) as well as
    the IPSec configuration.

|  Use of manually configured preshared keys for IPsec
|  between relay agents and servers does not defend against
|  replayed DHCP messages.  Replayed messages can
|  represent a DOS attack through exhaustion of
|  processing resources, but not through mis-configuration
|  or exhaustion of other resources such as assignable addresses.

--=====================_17384597==_.ALT
Content-Type: text/html; charset="us-ascii"

<html>
FYI...The IESG has requested changes in two sections of
draft-ietf-dhc-dhcpv6-28.txt, prior to its acceptance as a Proposed
Standard and publication as an RFC.&nbsp; The changes are noted in the
text included below from sections 21.1 and 23.&nbsp; The change is
motivated by the observation that manual keying does not prevent replay
attacks.<br>
<br>
The sentence identified in the first paragraph of 21.1 will be
removed.&nbsp; The list item labeled &quot;Key Management&quot; will be
replaced with the text shown below.&nbsp; The previous text mentioned
only manual keying.&nbsp; The indicated (last) paragraph in section 23
will be added.<br>
<br>
- Ralph<br>
<br>
=====<br>
<br>
21.1. Security of Messages Sent Between Servers and Relay Agents<br>
<br>
&nbsp;&nbsp; Relay agents and servers that exchange messages securely use
the<br>
|&nbsp; IPsec mechanisms for IPv6 [11].&nbsp; <font color="#FF0000">Relay
agents and servers MUST<br>
</font>|&nbsp; <font color="#FF0000">support manual configuration and
installation of static keys.</font>&nbsp; If<br>
|&nbsp; a client message is relayed through multiple relay agents, each
of<br>
&nbsp;&nbsp; the relay agents must have established independent, pairwise
trust<br>
&nbsp;&nbsp; relationships.&nbsp; That is, if messages from client C will
be relayed by<br>
&nbsp;&nbsp; relay agent A to relay agent B and then to the server, relay
agents A<br>
&nbsp;&nbsp; and B must be configured to use IPSec for the messages they
exchange,<br>
&nbsp;&nbsp; and relay agent B and the server must be configured to use
IPSec for<br>
&nbsp;&nbsp; the messages they exchange.<br>
<br>
&nbsp;&nbsp; Relay agents and servers that support secure relay agent to
server<br>
&nbsp;&nbsp; or relay agent to relay agent communication use IPsec under
the<br>
&nbsp;&nbsp; following conditions:<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Selectors&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Relay agents are
manually configured with the<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
addresses of the relay agent or server to which<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
DHCP messages are to be forwarded.&nbsp; Each relay<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
agent and server that will be using IPsec for<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
securing DHCP messages must also be configured<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
with a list of the relay agents to which messages<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
will be returned.&nbsp; The selectors for the relay<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
agents and servers will be the pairs of addresses<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
defining relay agents and servers that exchange<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
DHCP messages on the DHCPv6 UDP ports 546 and<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
547.<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Mode&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Relay agents and servers use transport mode and<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
ESP. The information in DHCP messages is not<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
generally considered confidential, so encryption<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
need not be used (i.e., NULL encryption can be<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
used).<br>
<br>
|&nbsp;&nbsp;&nbsp;&nbsp; Key management&nbsp;&nbsp; Because the relay
agents and servers are used<br>
|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
within an organization, public key schemes are<br>
|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
not necessary.&nbsp; Because the relay agents and<br>
|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
servers must be manually configured, manually<br>
|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
configured key management may suffice, but<br>
|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
doesn't provide defense against replayed<br>
|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
messages.&nbsp; Accordingly, IKE with preshared<br>
|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
secrets SHOULD be supported.&nbsp; IKE with public<br>
|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
keys MAY be supported.<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Security policy&nbsp; DHCP messages
between relay agents and servers<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
should only be accepted from DHCP peers as<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
identified in the local configuration.<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Authentication&nbsp;&nbsp; Shared keys,
indexed to the source IP address of<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
the received DHCP message, are adequate in this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
application.<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Availability&nbsp;&nbsp;&nbsp;&nbsp;
Appropriate IPsec implementations are likely to<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
be available for servers and for relay agents in<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
more featureful devices used in enterprise and<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
core ISP networks.&nbsp; IPsec is less likely to be<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
available for relay agents in low end devices<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
primarily used in the home or small office<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
markets.<br>
<br>
23. Security Considerations<br>
&nbsp;&nbsp; [...]<br>
<br>
&nbsp;&nbsp; Communication between a server and a relay agent and
communication<br>
&nbsp;&nbsp; between relay agents can be secured through the use of
IPSec, as<br>
&nbsp;&nbsp; described in section 21.1.&nbsp; The use of manual
configuration and<br>
&nbsp;&nbsp; installation of static keys are acceptable in this instance
because<br>
&nbsp;&nbsp; relay agents and the server will belong to the same
administrative<br>
&nbsp;&nbsp; domain and the relay agents will require other specific
configuration<br>
&nbsp;&nbsp; (for example, configuration of the DHCP server address) as
well as<br>
&nbsp;&nbsp; the IPSec configuration.<br>
<br>
|&nbsp; Use of manually configured preshared keys for IPsec<br>
|&nbsp; between relay agents and servers does not defend against<br>
|&nbsp; replayed DHCP messages.&nbsp; Replayed messages can<br>
|&nbsp; represent a DOS attack through exhaustion of<br>
|&nbsp; processing resources, but not through mis-configuration<br>
|&nbsp; or exhaustion of other resources such as assignable
addresses.<br>
</html>

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A revision to the 'KDC Server Address sub-option' of the CableLabs
Client Configuration (CCC) Option is attached, hereby submitted to
update draft-ietf-dhc-suboptions-kdc-serveraddress-01. The attached
version updates the reference to the 'DHCP Option for CableLabs Client
Configuration' i-d.

 <<draft-ietf-dhc-suboptions-kdc-serveraddress-02.txt>>=20

Regards,

	Kevin Luehrs

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Kevin Luehrs
Project Director, CableHome Engineering
CableLabs
400 Centennial Parkway
Louisville, CO 80027
303 661 9100
fax 303 661 9199
k.luehrs@cablelabs.com


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<P><FONT FACE=3D"Book Antiqua">A revision to the 'KDC Server Address =
sub-option' of the CableLabs Client Configuration (CCC) Option is =
attached, hereby submitted to update =
draft-ietf-dhc-suboptions-kdc-serveraddress-01. The attached version =
updates the reference to the 'DHCP Option for CableLabs Client =
Configuration' i-d.</FONT></P>

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<P><FONT FACE=3D"Book Antiqua">Regards,</FONT>
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<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT FACE=3D"Book =
Antiqua">Kevin Luehrs</FONT>
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<P><FONT FACE=3D"Book =
Antiqua">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</FONT>

<BR><FONT FACE=3D"Book Antiqua">Kevin Luehrs</FONT>

<BR><FONT FACE=3D"Book Antiqua">Project Director, CableHome =
Engineering</FONT>

<BR><FONT FACE=3D"Book Antiqua">CableLabs</FONT>

<BR><FONT FACE=3D"Book Antiqua">400 Centennial Parkway</FONT>

<BR><FONT FACE=3D"Book Antiqua">Louisville, CO 80027</FONT>

<BR><FONT FACE=3D"Book Antiqua">303 661 9100</FONT>

<BR><FONT FACE=3D"Book Antiqua">fax 303 661 9199</FONT>

<BR><FONT FACE=3D"Book Antiqua">k.luehrs@cablelabs.com</FONT>
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			DHC WG Meeting minutes
			 (Draft, 12/12/2002)
		      IETF 55, Atlanta, 11/2002
		      =========================

Administrivia, agenda bashing, Ralph Droms
------------------------------------------
CableLabs Client Configuration option draft is in IETF last call.  So
far, the last call has elicited comments requiring some editorial and
minor specification changes.

DHCPv6 specification has been reviewed by IESG, and requires small
edits to text describing relay agent security.  Droms will post
summary of changes to WG mailing list.


Use of IPsec for Securing DHCPv4 Messages Exchanged Between Relay
Agents and Servers, Ralph Droms
-----------------------------------------------------------------
draft-droms-dhcp-relay-agent-ipsec-00.txt describes use of IPsec for
securing messages between relay agents and servers.  Carl Smith asked
if it is different than the mechanism in the DHCPv6 draft; answer:
no.  Narten asked for comparison with Stapp's
draft-ietf-dhc-auth-suboption-01.txt.   Droms noted IPsec mechanism is
hop-by-hop while authentication options covers entire path; IPsec
mechanism incurs extra complexity if there are multiple relay agents
in the path to the server.  The WG agreed to take the document on as
a WG document.

The Authentication Suboption for the DHCP Relay Agent Option,
Mark Stapp
------------------------------------------------------------------
draft-ietf-dhc-auth-suboption-01.txt specifies a DHCP-specific
mechanism, based on a relay agent suboption that contains a message
digest for checking message integrity.  This mechanism uses shared
keys and includes an identifier mechanism to accommodate edge devices
that don't use giaddr.  With additional changes, this mechanism can
accommodate multiple, nested relay agents.

The WG was asked what to do with the two proposals: advance both,
adopt one?  Does the WG have a clear understanding of the two
proposals?  Ted Lemon asked how we might weight the pros and cons.
Thomas Narten and Stuart Cheshie asked if there is any data on whether
IPsec implementations are available to relay agents today.  Mark Stapp
asked about potential computational complexity issues.  Stapp, Lemon
and John Schnizlein all asked what the perceived customer requirements
are.  Droms expressed concern about interoperability if both proposals
are advanced.  Erik Nordmark asked how relay agents would be
configured to use IPsec or with the keys for the relay agent option.
Droms pointed out that reuse of IPsec technology implies the
availability of future IPsec enhancements.  Schnizlein volunteered to
organize discussion of pros and cons of both proposals on the WG
mailing list.

DHCP Option for SNMP Notifications, Mark Bakke
----------------------------------------------
draft-bakke-dhc-snmp-trap-01.txt was developed to address requirements
for systems using diskless boot to obtain a list of IP addresses to
which to send SNMP traps.  Narten asked which WG is best for
discussion of this option - in theory, details should be discussed in
an SNMP WG with final review of syntax and compatibility in the dhc
WG.  Narten will coordinate review of the document with MIB groups in
the IETF, and the document will ultimately be a dhc WG work item, as
there are no appropriate active SNMP WGs.  There was a question about
whether the option should be expanded with multiple sub-options for
different trap types.

Subnet Allocation using DHCP, Richard Johnson
---------------------------------------------
This proposal describes a mechanism through which a DHCP server can
delegate a block of addresses (IPv4), collect usage data on the
delegated addresses and deprecate use of addresses.  It is similar to
the prefix delegation mechanism for DHCPv6.  Ted Lemon pointed out
that this proposal would require a major revision to existing
server, and he suggested that the authors review previous, related
work by Walt Lazear.  The WG agreed to take on this document as a WG
work item.

DHCP Server-ID Override Suboption, Richard Johnson
--------------------------------------------------
Some DHCP client messages, such as DHCPRENEW, are unicast directly to
the DHCP server and not received by a relay agent.  Thus, relay agents
are unable to add relay agent options to those messages.  This
proposal provides a mechanism through which the DHCP server can
configure the client to respond to the relay agent rather than
directly to the server.  Narten asked if continued expansion of relay
agent options is a good thing.  WG consensus is that relay agent
options have been found to provide function that cannot be provided in
other ways, and the full range of application for relay agent options
is still being explored.  Stapp suggested revisiting the relay agent
option specification, RFC3046, as a WG charter item.  The WG agreed to
take on this document as a WG work item.

Considerations for the use of the Host Name option, Carl Smith
--------------------------------------------------------------
Carl had one question for the WG: how can a client request that its
name/address association be removed from DNS?  Can we use the FQDN to
accomplish this result?  Kim Kinnear and Ted Lemon asked what customer
requires this result.  Bernie Volz suggested revisiting this question
after the DHCPv6 FQDN model is completed.

Load Balancing for DHCPv6, Bernie Volz
--------------------------------------
Any more changes needed in this draft?  No; so this document is ready
for WG last call after DHCPv6 spec has advanced.

Other DHCPv6 options, Ralph Droms
---------------------------------
draft-ietf-dhc-dhcpv6-opt-prefix-delegation-00.txt has folded prefix
delegation into identity associations; the document is also under
discussion in the ipv6 WG.

draft-ietf-dhc-dhcpv6-opt-dnsconfig-02.txt,
draft-ietf-dhc-dhcpv6-opt-nisconfig-01.txt,
draft-ietf-dhc-dhcpv6-opt-timeconfig-01.txt are all ready for WG last
call as soon as DHCPv6 advances.

draft-ietf-dhc-dhcpv6-opt-dstm-01.txt and
draft-ietf-dhc-dhcpv6-opt-dstm-ports-01.txt are to be synced up with
v6ops work.

Lemon, Volz and Narten all asked about the requirement for the
mechanism proposed in draft-ietf-dhc-dhcpv6-opt-cliprefprefix-00.txt.
A K Vijayabhaskar (author) to clarify motivation and requirements in
the specification.

A Guide to Implementing Stateless DHCPv6 Service, Ralph Droms
-------------------------------------------------------------
Droms asked the WG about the best way to specify the parts of DHCPv6
required for stateless DHCPv6 operation ("DHCPv6-lite") - for example,
for providing DNS server configuration without address assignment.
Stuart Cheshire asked if the document should be informational or
standards-track.  Another possibility would be BCP.  The WG asked that
the Reconfigure message be added to
draft-droms-dhcpv6-stateless-guide-01.txt and accepted the document as
a dhc WG work item.

Revised DHC WG charter and milestones, Ralph Droms
--------------------------------------------------
Droms reported that the revised charter and milestones have been
submitted to the IESG.  The IESG suggested adding a separate charter
item to develop a mechanism through which a client can authenticate a
server without authentication of the client by the server.  Droms will
add the relay agent charter item suggested by Stapp (see above).

Carl Smith, Bernie Volz and Barr Hibbs volunteered to be a design team
that will follow up on the charter item to review RFC3118; they will
develop a threat model and analysis of the authentication provided by
RFC3118.  Barr Hibbs volunteered to coordinate and act as editor for a
review of the DHCPv4 specification.

Recycling option codes, Ralph Droms
-----------------------------------
There are more than 15 options codes that have been assigned but never
used.  Droms will publish an Internet Draft identifying these option
codes and asking for feedback from the Internet community about
whether these option codes can be returned to IANA for reassignment.
After the Internet Draft has been reviewed by the dhc WG and by the
IESG, it will be submitted to IANA.

DHCP Lease Query, Kim Kinnear
-----------------------------
The WG last call on draft-ietf-dhc-leasequery-05.txt has completed.
Based on input from the last call, Kinnear has changed the draft to
use a new option rather than overloading the requested address
option, and has made other editorial changes.  The document is now
ready for submission to the IESG.

Link Selection sub-option for the Relay Agent Information Option,
Kim Kinnear
-----------------------------------------------------------------
Last call on draft-ietf-dhc-agent-subnet-selection-04.txt has
completed.  This document is waiting for authentication of relay agent
messages to be resolved.

DHCP Subscriber ID Suboption for the DHCP Relay Agent Option,
Richard Johnson
-------------------------------------------------------------
This option, in draft-johnson-dhc-subscriber-id-00.txt, is motivated
by a requirement to identify a subscriber in a relay agent option,
regardless of the port to which the subscriber is attached.  The WG
agreed to take on this document as a WG work item.

DHCP Option for Geographic Location, John Schnizlein
----------------------------------------------------
This option, in draft-polk-dhcp-geo-loc-option-00.txt, passes location
information about a DHCP client from the server to the client.  The
immediate purpose is to provide location information to IP phones.
The geopriv WG will own the semantics, while the dhc WG will own the
protocol and the syntax of the option.

The DHCP Client FQDN Option, Mark Stapp
DDNS-DHCP conflict resolution, Mark Stapp
-----------------------------------------

Stapp reported on draft-ietf-dhc-fqdn-option-05.txt,
draft-ietf-dhc-ddns-resolution-05.txt,
draft-ietf-dnsext-dhcid-rr-05.txt.  There are no deployed
implementations of these drafts.  Cisco and two others have
(non-interoperable) implementation that use TXT RRs, waiting for
approval of DHCID RR.  Droms asked for a summary of changes to the
current drafts.  Stapp will post summaries to WG mailing list.
Gudmundsson asked if the DHSID RR should become a more general RR
type.  WG consensus was no, as that would delay progress of these
drafts and there is no specific requirement for other, similar RR
types.  Gudmundsson and Droms agreed documents are ready for dnsext
and dhc WG last call.

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Subject: [dhcwg] FORCE RENEW questions
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Two questions:

A) Is DHCP FORCE RENEW supported by any operating system today? Or are =
there any known plans for it at Microsoft, Linux, BSD, etc.?

B) Is it possible to send a FORCE RENEW to a NIC that has not yet been =
configured with an IP address, that is, a NIC that never received a DHCP =
reply after reboot? (With the result that the host will do a DHCP =
request).

/TM



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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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charset=3Diso-8859-1">
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Two questions:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>A) Is DHCP FORCE RENEW supported by any =
operating=20
system today? Or are there any known plans for it at Microsoft, Linux, =
BSD,=20
etc.?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>B) Is it possible to send a FORCE RENEW =
to a NIC=20
that has not yet been configured with an IP address, that is, a NIC that =
never=20
received a DHCP reply after reboot? (With the result that the host will =
do a=20
DHCP request).</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>/TM</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV></BODY></HTML>

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From dhcwg-admin@ietf.org  Thu Dec 12 22:23:17 2002
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From: Timir Naik <timirn@yahoo.com>
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Subject: [dhcwg] dhcp solaris client error
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I got myself a cable modem and a wireless router
D-Link 614+.  The route is capable to run dhcp client
to get the internet IP address and dhcp server for the
clients inside the network.  The dhcp server is
working great with my windows' client but is giving me
this error, "no valid OFFER/BOOTP reply" when I try
running dhcp client on my Solaris 8 box.  

I received the above error message when I ran the
following commands:

1. blank hostname.hme0
2. blank dhcp.hme0
3. /sbin/dhcpagent -d 1 -f 1 &
4. ifconfig hme0 dhcp start

and this is when I the error "no valid OFFER/BOOTP
reply".  

I was hoping someone can help me out with this
problem.

Thank you,
Tim


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From dhcwg-admin@ietf.org  Fri Dec 13 00:09:27 2002
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From: "Barr Hibbs" <rbhibbs@pacbell.net>
To: <dhcwg@ietf.org>
Subject: RE: [dhcwg] FORCE RENEW questions
Date: Thu, 12 Dec 2002 21:09:37 -0800
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I'm also interested in the answer to question (A) in the original message,
so would any responders please post their replies to the DHCWG mailing
list....  As an additional point, do the implementations of FORCERENEW also
implement DHCP Authentication [RFC 3118] as required by RFC 3203?

As to question (B), the NIC is not the DHCP client, so let me restate the
question and then answer it:  "Is it possible to send a FORCERENEW message
to an unconfigured client?"  As this message is unicast to a DHCP client,
and the client is directed to silently discard multicast messages, it is not
possible for an unconfigured client to receive a FORCERENEW message.  The
DHCP protocol [RFC 2131] describes how a DHCP client may continue
broadcasting DHCPDISCOVER messages if a DHCP server has not answered.  An
unconfigured client must not begin the protocol exchange with a DHCPREQUEST
message.  RFC 2131 also describes how a previously configured client may
recover from loss of contact with the server, but that is a different case
than you asked about.

--Barr Hibbs

  -----Original Message-----
  From: dhcwg-admin@ietf.org [mailto:dhcwg-admin@ietf.org]On Behalf Of tm
  Sent: Thursday, December 12, 2002 01:22
  To: dhcwg@ietf.org
  Subject: [dhcwg] FORCE RENEW questions


  Two questions:

  A) Is DHCP FORCE RENEW supported by any operating system today? Or are
there any known plans for it at Microsoft, Linux, BSD, etc.?

  B) Is it possible to send a FORCE RENEW to a NIC that has not yet been
configured with an IP address, that is, a NIC that never received a DHCP
reply after reboot? (With the result that the host will do a DHCP request).

  /TM


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charset=3Diso-8859-1">
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<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><SPAN class=3D662395304-13122002><FONT face=3DArial color=3D#0000ff =
size=3D2>I'm=20
also interested in the answer to question (A) in the original message, =
so would=20
any responders please post their replies to the DHCWG mailing =
list....&nbsp; As=20
an additional point, do the implementations of FORCERENEW also implement =
DHCP=20
Authentication [RFC 3118] as required by RFC 3203?</FONT></SPAN></DIV>
<DIV><SPAN class=3D662395304-13122002><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D662395304-13122002><FONT face=3DArial color=3D#0000ff =
size=3D2>As to=20
question (B), the NIC is not the DHCP client, so let me restate the =
question and=20
then answer it:&nbsp; "Is it possible to send a FORCERENEW message to an =

unconfigured client?"&nbsp; As this message is unicast to a DHCP client, =
and the=20
client is directed to silently discard multicast messages, it is not =
possible=20
for an unconfigured client to receive a FORCERENEW message.&nbsp; The =
DHCP=20
protocol [RFC 2131] describes how a DHCP client may continue =
broadcasting=20
DHCPDISCOVER messages if a DHCP server has not answered.&nbsp; An =
unconfigured=20
client must not begin the protocol exchange with a DHCPREQUEST =
message.&nbsp;=20
RFC 2131 also describes how a previously configured client may recover =
from loss=20
of contact with the server, but that is a different case than you asked=20
about.</FONT></SPAN></DIV>
<DIV><SPAN class=3D662395304-13122002><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D662395304-13122002><FONT face=3DArial color=3D#0000ff =
size=3D2>--Barr=20
Hibbs</FONT></SPAN></DIV>
<DIV><SPAN class=3D662395304-13122002></SPAN>&nbsp;</DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
  <DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
  size=3D2>-----Original Message-----<BR><B>From:</B> =
dhcwg-admin@ietf.org=20
  [mailto:dhcwg-admin@ietf.org]<B>On Behalf Of </B>tm<BR><B>Sent:</B> =
Thursday,=20
  December 12, 2002 01:22<BR><B>To:</B> =
dhcwg@ietf.org<BR><B>Subject:</B>=20
  [dhcwg] FORCE RENEW questions<BR><BR></FONT></DIV>
  <DIV><FONT face=3DArial size=3D2>Two questions:</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>A) Is DHCP FORCE RENEW supported by =
any operating=20
  system today? Or are there any known plans for it at Microsoft, Linux, =
BSD,=20
  etc.?</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>B) Is it possible to send a FORCE =
RENEW to a NIC=20
  that has not yet been configured with an IP address, that is, a NIC =
that never=20
  received a DHCP reply after reboot? (With the result that the host =
will do a=20
  DHCP request).</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>/TM</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial =
size=3D2></FONT>&nbsp;</DIV></BLOCKQUOTE></BODY></HTML>

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Subject: [dhcwg] RFC 3442 on The Classless Static Route Option for Dynamic Host Configuration Protocol (DHCP) version 4
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--NextPart


A new Request for Comments is now available in online RFC libraries.


        RFC 3442
                                    
        Title:      The Classless Static Route Option for Dynamic Host
                    Configuration Protocol (DHCP) version 4
        Author(s):  T. Lemon, S. Cheshire, B. Volz
        Status:     Standards Track
        Date:       December 2002
        Mailbox:    Ted.Lemon@nominum.com, rfc@stuartcheshire.org,
                    bernie.volz@ericsson.com
        Pages:      9
        Characters: 19370
        Updates:    2132
                                    
        I-D Tag:    draft-ietf-dhc-csr-07.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc3442.txt


This document defines a new Dynamic Host Configuration Protocol (DHCP)
option which is passed from the DHCP Server to the DHCP Client to
configure a list of static routes in the client.  The network
destinations in these routes are classless - each routing table entry
includes a subnet mask.

This document is a product of the Dynamic Host Configuration Working
Group of the IETF.

This is now a Proposed Standard Working Group of the IETF.

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.

This announcement is sent to the IETF list and the RFC-DIST list.
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Submissions for Requests for Comments should be sent to
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Authors, for further information.


Joyce K. Reynolds and Sandy Ginoza
USC/Information Sciences Institute

...

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Subject: [dhcwg] LeaseQuery draft
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The draft Atlanta minutes make reference to a
draft-ietf-dhc-leasequery-05.txt, but the latest version I can find is -04.
Any idea where -05 is?

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<P><FONT SIZE=3D2>The draft Atlanta minutes make reference to a =
draft-ietf-dhc-leasequery-05.txt, but the latest version I can find is =
-04.&nbsp; Any idea where -05 is?</FONT></P>

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From dhcwg-admin@ietf.org  Tue Dec 17 08:17:55 2002
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To: <Andre@incognito.com>, <dhcwg@ietf.org>
Subject: Re: [dhcwg] LeaseQuery draft
Date: Tue, 17 Dec 2002 13:17:59 GMT
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Sorry, that's my mistake.  There was confusion about the numbering for that 
Internet Draft.  The latest version is -04.

- Ralph

> The draft Atlanta minutes make reference to a
> draft-ietf-dhc-leasequery-05.txt, but the latest version I can find is -04.
> Any idea where -05 is?
> 




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From dhcwg-admin@ietf.org  Tue Dec 17 14:55:43 2002
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Subject: [dhcwg] Protocol Action: Dynamic Host Configuration Protocol for IPv6
 (DHCPv6) to Proposed Standard
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The IESG has approved the Internet-Draft 'Dynamic Host Configuration
Protocol for IPv6 (DHCPv6)' <draft-ietf-dhc-dhcpv6-28.txt> as a
Proposed Standard.  This document is the product of the Dynamic Host
Configuration Working Group.  The IESG contact persons are Erik
Nordmark and Thomas Narten.


Technical Summary
 
      The Dynamic Host Configuration Protocol for IPv6 (DHCPv6) 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.

      DHCPv6 offers two modes of operation. In stateful mode, the DHC
      server maintains per-client configuration information (e.g.,
      addresses). In stateless mode, the DHC server stores no per-client
      information. Stateless mode is used when the information provided
      is the same regardless of who asks for it, or because the
      appropriate configuration information to be returned to a client
      can be determined idempotently based on the information on the
      request (e.g., all clients connected to particular links are to use
      the same set of DNS servers).
 
Working Group Summary
 
  There was consensus for this in the WG and no significant issues were
  raised during the IETF Last Call.
 
Protocol Quality
 
  This protocol has been reviewed for the IESG by Thomas Narten.


RFC Editor Note:

In Section 21.1, delete the following sentence from the first
 paragraph:

 > Relay agents and servers MUST support manual configuration and
 > installation of static keys.

 In Section 21.1, change the item:

 > Key management Because the relay agents and servers must be
 > manually configured, no automated key management
 > is required.

 to

	Key management Because the relay agents and servers are used
	      within an organization, public key schemes are
            not necessary. Because the relay agents and
            servers must be manually configured, manually
            configured key management may suffice, but
            doesn't provide defense against replayed
            messages. Accordingly, IKE with preshared
            secrets SHOULD be supported. IKE with public
            keys MAY be supported.

 In Section 23, Security Considerations, add the following new second 
 paragraph, immediately after the first one:

	Use of manually configured preshared keys for IPsec between relay
      agents and servers does not defend against replayed DHCP messages.
      Replayed messages can represent a DOS attack through exhaustion 
	of processing resources, but not through mis-configuration or
      exhaustion of other resources such as assignable addresses.
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From dhcwg-admin@ietf.org  Tue Dec 17 15:34:06 2002
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To: dhcwg@ietf.org
Date: Tue, 17 Dec 2002 15:32:11 -0500
From: Thomas Narten <narten@us.ibm.com>
Subject: [dhcwg] FWD: Re: IESG draft-cheshire-ipv4-acd-02.txt
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Anyone care to comment on the assertion below regarding a typo in 2131?

Thomas
- ------- Forwarded Message

From: Stuart Cheshire <cheshire@apple.com>
To: "Erik Nordmark" <Erik.Nordmark@sun.com>
Cc: <zeroconf@merit.edu>
Date: Fri, 13 Dec 2002 18:45:26 -0800
Subject: Re: IESG draft-cheshire-ipv4-acd-02.txt

At last, a reply that actually relates to the subject line.

>> > But the ongoing conflict detection (causing
>> > IP address change when a conflict appears) and broadcast replies looks
>> > more like a useful experiment to me.
>> 
>> It has been a five-year experiment by Apple.
>
>Do you have a pointer to the data that has been collected as part of
>that experiment?

There is no data. That's the point. After shipping millions of machines 
per year for five years, the number of reported problems is zero.

>How about adding
>	This document updates RFC 826 and RFC 2132.

I added a header line that says "Updates: 826, 2132"

>RFC 2131 actually talks about an ARP reply and not the ARP request
>with sender=target. See section 4.4.1 in RFC 2131.
>So you don't seem to be consistent with RFC 2131.

Stevens describes using ARP request.
BSD broadcasts an ARP request to announce its address.
Mac OS 9 broadcasts an ARP request to announce its address.
Mac OS X broadcasts an ARP request to announce its address.
Windows broadcasts an ARP request to announce its address.

RFC 2131 describes broadcasting an ARP reply, but like many things in RFC 
2131, this is probably a typo. As has been pointed out many times by many 
people, broadcasting an ARP reply is unconventional, and best avoided 
where not necessary. Therefore I avoided it and followed the behaviour 
described by Stevens (and implemented on Mac, Windows, Unix, etc.) 
instead.

In any case, the "Packet Reception" rules of RFC 826 are exceedingly 
clear that checking the packet opcode is the *last* check that is done, 
after all other packet processing has been completed.

Do you have a technical opinion to offer about which you think is best?

>I wasn't suggesting a normative reference; that isn't needed since the
>document is self-contained. But pointing out the relationship using a
>non-normative reference to draft-ietf-zeroconf-ipv6-link-local would be 
>useful for the implementors that are going to implement both.

There is already a non-normative reference to the v4ll draft.

If there is specific text you'd like to see in the draft, I'd be happy to 
consider any suggestions you wish to offer.

>>    At any time, if a host
>>    receives an ARP packet (request *or* reply) where the 'sender IP
>>    address' is the host's own IP address, but the 'sender hardware
>>    address' does not match any of the host's own interface addresses,
>>    then this is a conflicting ARP packet
>
>I fail to find the word "multihoming" or any explicit mention of
>multiple interfaces in the above text.

The phrase, "any of the host's own interface addresses" is a mention of 
multiple interfaces.

If there is specific text you'd like to see in the draft, I'd be happy to 
consider any suggestions you wish to offer.

>> > I would assume that ACD can 
>> > operate independently for each interface even though v4LL has some 
>> > extra stuff related to multi-interface nodes.
>> 
>> No, the specification needs to deal with the case when a host has two 
>> interfaces (say wireless and Ethernet) on the same link.
>
>And you claim you can't do that by having the interfaces be configured
>independently of eachother?

If there is specific text you'd like to see in the draft, I'd be happy to 
consider any suggestions you wish to offer.

>I think my conclusion was that the time should be shorter
>than 8 seconds and not longer. 8 seconds is a useless compromise
>as far as I can tell since it is unecessarily long when STP isn't triggered
>and too short when STP is triggered (with out of the box bridge
>configurations.) Thus 2 or 3 seconds should be fine.

The document already has specific text allowing shorter timeouts in cases 
where the implementer has reason to believe that is a wise design choice.

The document already has specific text describing how the individual 
choice of timeout doesn't have any impact on interoperability with other 
devices.

If there is specific text you'd like to see in the draft, I'd be happy to 
consider any suggestions you wish to offer.

>> Most network operators today, with good reason, set their port blocking 
>> time to five seconds.
>
>Doesn't match my experience. And doesn't match the IEEE 802.1D 
>recommendation.

If there is specific text you'd like to see in the draft, I'd be happy to 
consider any suggestions you wish to offer.

>Is there a way for the host to reliably detect whether the switches run 
>RSTP instead of STP?

Quoting from Mick Seaman: "Yes, the driver can easily tell the difference 
between an RSTP and an STP BPDU, they are different 'BPDU types', a type 
field being defined in the BPDU format."

If there is specific text you'd like to see in the draft, I'd be happy to 
consider any suggestions you wish to offer.

>> A Zero Configuration device may want to make use of address conflict 
>> detection. If address conflict detection requires a mandatory 
>> user-configuration option, then that means that Zero Configuration 
>> devices require mandatory user-configuration options, a 
>> self-contradiction.
>
>I'd understand that comment if it was about 
>draft-ietf-zeroconf-ipv4-link-local
>but not about the ACD document. Since the addresses are configured either
>manually or by DHCP (or some other provisioning protocol) it is possible to
>add a knob in the manual config or in DHCP, respectively. So I don't
>understand the issue your are concerned about.

I don't understand why you think there is a problem.

DHCP clients have done address conflict detection for years, and no one 
has asked for an option to disable address conflict detection there.

Macs have done address conflict detection for manual addresses for years, 
and no one has asked for an option to disable that either.

Even Windows tells you if you manually set your IP address to an address 
that's already in use.

If you've ever struggled with a network where two machines were set to 
the same IP address, you'd think it insane to ever think you'd NOT want 
to get all the help you can to diagnose and fix that problem.

I don't understand why now, after all these years of successful address 
conflict detection that no one ever complained about, there's suddenly a 
feeling that we need manual configuration options to disable it.

Stuart Cheshire <cheshire@apple.com>
 * Wizard Without Portfolio, Apple Computer, Inc.
 * Chairman, IETF Zeroconf
 * www.stuartcheshire.org

- ------- End of Forwarded Message

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From dhcwg-admin@ietf.org  Tue Dec 17 16:30:38 2002
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From: "Bernie Volz (EUD)" <Bernie.Volz@am1.ericsson.se>
To: "'Thomas Narten'" <narten@us.ibm.com>, dhcwg@ietf.org
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Subject: [dhcwg] Is RFC 2131 Correct? ARP Request or ARP Reply ... IT IS CORRECT -
 BOTH ARE SENT!!
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RFC 2131 is CORRECT as it is!!! See the text below.

The first part talks about an ARP Request. This is used to solicit an
ARP reply from another host that might be using that address. If no
reply is received, then the client uses the address and THEN sends an
ARP reply. The ARP reply causes the caches in all other systems on the
LAN to be updated SHOULD THEY have an old mapping for the address (for
example, from the previous client that released the address).

Perhaps the error in RFC 2131 is that it doesn't make that fully clear.
In the last sentence of the text from 2131 below, it should have said
that if the client does not receive a reply to ARP request, it uses
the address and the client SHOULD broadcast an ARP reply ...

   If the parameters are acceptable, the client records the address of
   the server that supplied the parameters from the 'server identifier'
   field and sends that address in the 'server identifier' field of a
   DHCPREQUEST broadcast message.  Once the DHCPACK message from the
   server arrives, the client is initialized and moves to BOUND state.
   The DHCPREQUEST message contains the same 'xid' as the DHCPOFFER
   message.  The client records the lease expiration time as the sum of
   the time at which the original request was sent and the duration of
   the lease from the DHCPACK message.    The client SHOULD perform a
   check on the suggested address to ensure that the address is not
   already in use.  For example, if the client is on a network that
   supports ARP, the client may issue an ARP request for the suggested
   request.  When broadcasting an ARP request for the suggested address,
   the client must fill in its own hardware address as the sender's
   hardware address, and 0 as the sender's IP address, to avoid
   confusing ARP caches in other hosts on the same subnet.  If the



Droms                       Standards Track                    [Page 38]

RFC 2131          Dynamic Host Configuration Protocol         March 1997


   network address appears to be in use, the client MUST send a
   DHCPDECLINE message to the server. The client SHOULD broadcast an ARP
   reply to announce the client's new IP address and clear any outdated
   ARP cache entries in hosts on the client's subnet.

-----Original Message-----
From: Thomas Narten [mailto:narten@us.ibm.com]
Sent: Tuesday, December 17, 2002 3:32 PM
To: dhcwg@ietf.org
Subject: [dhcwg] FWD: Re: IESG draft-cheshire-ipv4-acd-02.txt


Anyone care to comment on the assertion below regarding a typo in 2131?

Thomas
- ------- Forwarded Message

From: Stuart Cheshire <cheshire@apple.com>
To: "Erik Nordmark" <Erik.Nordmark@sun.com>
Cc: <zeroconf@merit.edu>
Date: Fri, 13 Dec 2002 18:45:26 -0800
Subject: Re: IESG draft-cheshire-ipv4-acd-02.txt

At last, a reply that actually relates to the subject line.

>> > But the ongoing conflict detection (causing
>> > IP address change when a conflict appears) and broadcast replies looks
>> > more like a useful experiment to me.
>> 
>> It has been a five-year experiment by Apple.
>
>Do you have a pointer to the data that has been collected as part of
>that experiment?

There is no data. That's the point. After shipping millions of machines 
per year for five years, the number of reported problems is zero.

>How about adding
>	This document updates RFC 826 and RFC 2132.

I added a header line that says "Updates: 826, 2132"

>RFC 2131 actually talks about an ARP reply and not the ARP request
>with sender=target. See section 4.4.1 in RFC 2131.
>So you don't seem to be consistent with RFC 2131.

Stevens describes using ARP request.
BSD broadcasts an ARP request to announce its address.
Mac OS 9 broadcasts an ARP request to announce its address.
Mac OS X broadcasts an ARP request to announce its address.
Windows broadcasts an ARP request to announce its address.

RFC 2131 describes broadcasting an ARP reply, but like many things in RFC 
2131, this is probably a typo. As has been pointed out many times by many 
people, broadcasting an ARP reply is unconventional, and best avoided 
where not necessary. Therefore I avoided it and followed the behaviour 
described by Stevens (and implemented on Mac, Windows, Unix, etc.) 
instead.

In any case, the "Packet Reception" rules of RFC 826 are exceedingly 
clear that checking the packet opcode is the *last* check that is done, 
after all other packet processing has been completed.

Do you have a technical opinion to offer about which you think is best?

>I wasn't suggesting a normative reference; that isn't needed since the
>document is self-contained. But pointing out the relationship using a
>non-normative reference to draft-ietf-zeroconf-ipv6-link-local would be 
>useful for the implementors that are going to implement both.

There is already a non-normative reference to the v4ll draft.

If there is specific text you'd like to see in the draft, I'd be happy to 
consider any suggestions you wish to offer.

>>    At any time, if a host
>>    receives an ARP packet (request *or* reply) where the 'sender IP
>>    address' is the host's own IP address, but the 'sender hardware
>>    address' does not match any of the host's own interface addresses,
>>    then this is a conflicting ARP packet
>
>I fail to find the word "multihoming" or any explicit mention of
>multiple interfaces in the above text.

The phrase, "any of the host's own interface addresses" is a mention of 
multiple interfaces.

If there is specific text you'd like to see in the draft, I'd be happy to 
consider any suggestions you wish to offer.

>> > I would assume that ACD can 
>> > operate independently for each interface even though v4LL has some 
>> > extra stuff related to multi-interface nodes.
>> 
>> No, the specification needs to deal with the case when a host has two 
>> interfaces (say wireless and Ethernet) on the same link.
>
>And you claim you can't do that by having the interfaces be configured
>independently of eachother?

If there is specific text you'd like to see in the draft, I'd be happy to 
consider any suggestions you wish to offer.

>I think my conclusion was that the time should be shorter
>than 8 seconds and not longer. 8 seconds is a useless compromise
>as far as I can tell since it is unecessarily long when STP isn't triggered
>and too short when STP is triggered (with out of the box bridge
>configurations.) Thus 2 or 3 seconds should be fine.

The document already has specific text allowing shorter timeouts in cases 
where the implementer has reason to believe that is a wise design choice.

The document already has specific text describing how the individual 
choice of timeout doesn't have any impact on interoperability with other 
devices.

If there is specific text you'd like to see in the draft, I'd be happy to 
consider any suggestions you wish to offer.

>> Most network operators today, with good reason, set their port blocking 
>> time to five seconds.
>
>Doesn't match my experience. And doesn't match the IEEE 802.1D 
>recommendation.

If there is specific text you'd like to see in the draft, I'd be happy to 
consider any suggestions you wish to offer.

>Is there a way for the host to reliably detect whether the switches run 
>RSTP instead of STP?

Quoting from Mick Seaman: "Yes, the driver can easily tell the difference 
between an RSTP and an STP BPDU, they are different 'BPDU types', a type 
field being defined in the BPDU format."

If there is specific text you'd like to see in the draft, I'd be happy to 
consider any suggestions you wish to offer.

>> A Zero Configuration device may want to make use of address conflict 
>> detection. If address conflict detection requires a mandatory 
>> user-configuration option, then that means that Zero Configuration 
>> devices require mandatory user-configuration options, a 
>> self-contradiction.
>
>I'd understand that comment if it was about 
>draft-ietf-zeroconf-ipv4-link-local
>but not about the ACD document. Since the addresses are configured either
>manually or by DHCP (or some other provisioning protocol) it is possible to
>add a knob in the manual config or in DHCP, respectively. So I don't
>understand the issue your are concerned about.

I don't understand why you think there is a problem.

DHCP clients have done address conflict detection for years, and no one 
has asked for an option to disable address conflict detection there.

Macs have done address conflict detection for manual addresses for years, 
and no one has asked for an option to disable that either.

Even Windows tells you if you manually set your IP address to an address 
that's already in use.

If you've ever struggled with a network where two machines were set to 
the same IP address, you'd think it insane to ever think you'd NOT want 
to get all the help you can to diagnose and fix that problem.

I don't understand why now, after all these years of successful address 
conflict detection that no one ever complained about, there's suddenly a 
feeling that we need manual configuration options to disable it.

Stuart Cheshire <cheshire@apple.com>
 * Wizard Without Portfolio, Apple Computer, Inc.
 * Chairman, IETF Zeroconf
 * www.stuartcheshire.org

- ------- End of Forwarded Message

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<TITLE>Is RFC 2131 Correct? ARP Request or ARP Reply ... IT IS CORRECT =
- BOTH ARE SENT!!</TITLE>
</HEAD>
<BODY>

<P><FONT SIZE=3D2>RFC 2131 is CORRECT as it is!!! See the text =
below.</FONT>
</P>

<P><FONT SIZE=3D2>The first part talks about an ARP Request. This is =
used to solicit an</FONT>
<BR><FONT SIZE=3D2>ARP reply from another host that might be using that =
address. If no</FONT>
<BR><FONT SIZE=3D2>reply is received, then the client uses the address =
and THEN sends an</FONT>
<BR><FONT SIZE=3D2>ARP reply. The ARP reply causes the caches in all =
other systems on the</FONT>
<BR><FONT SIZE=3D2>LAN to be updated SHOULD THEY have an old mapping =
for the address (for</FONT>
<BR><FONT SIZE=3D2>example, from the previous client that released the =
address).</FONT>
</P>

<P><FONT SIZE=3D2>Perhaps the error in RFC 2131 is that it doesn't make =
that fully clear.</FONT>
<BR><FONT SIZE=3D2>In the last sentence of the text from 2131 below, it =
should have said</FONT>
<BR><FONT SIZE=3D2>that if the client does not receive a reply to ARP =
request, it uses</FONT>
<BR><FONT SIZE=3D2>the address and the client SHOULD broadcast an ARP =
reply ...</FONT>
</P>

<P><FONT SIZE=3D2>&nbsp;&nbsp; If the parameters are acceptable, the =
client records the address of</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; the server that supplied the parameters =
from the 'server identifier'</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; field and sends that address in the =
'server identifier' field of a</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; DHCPREQUEST broadcast message.&nbsp; =
Once the DHCPACK message from the</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; server arrives, the client is =
initialized and moves to BOUND state.</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; The DHCPREQUEST message contains the =
same 'xid' as the DHCPOFFER</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; message.&nbsp; The client records the =
lease expiration time as the sum of</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; the time at which the original request =
was sent and the duration of</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; the lease from the DHCPACK =
message.&nbsp;&nbsp;&nbsp; The client SHOULD perform a</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; check on the suggested address to =
ensure that the address is not</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; already in use.&nbsp; For example, if =
the client is on a network that</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; supports ARP, the client may issue an =
ARP request for the suggested</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; request.&nbsp; When broadcasting an ARP =
request for the suggested address,</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; the client must fill in its own =
hardware address as the sender's</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; hardware address, and 0 as the sender's =
IP address, to avoid</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; confusing ARP caches in other hosts on =
the same subnet.&nbsp; If the</FONT>
</P>
<BR>
<BR>

<P><FONT =
SIZE=3D2>Droms&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p; Standards =
Track&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [Page 38]</FONT>
<BR><FONT SIZE=3D2>=0C</FONT>
<BR><FONT SIZE=3D2>RFC =
2131&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Dynamic Host =
Configuration Protocol&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
March 1997</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>&nbsp;&nbsp; network address appears to be in use, =
the client MUST send a</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; DHCPDECLINE message to the server. The =
client SHOULD broadcast an ARP</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; reply to announce the client's new IP =
address and clear any outdated</FONT>
<BR><FONT SIZE=3D2>&nbsp;&nbsp; ARP cache entries in hosts on the =
client's subnet.</FONT>
</P>

<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Thomas Narten [<A =
HREF=3D"mailto:narten@us.ibm.com">mailto:narten@us.ibm.com</A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Tuesday, December 17, 2002 3:32 PM</FONT>
<BR><FONT SIZE=3D2>To: dhcwg@ietf.org</FONT>
<BR><FONT SIZE=3D2>Subject: [dhcwg] FWD: Re: IESG =
draft-cheshire-ipv4-acd-02.txt</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Anyone care to comment on the assertion below =
regarding a typo in 2131?</FONT>
</P>

<P><FONT SIZE=3D2>Thomas</FONT>
<BR><FONT SIZE=3D2>- ------- Forwarded Message</FONT>
</P>

<P><FONT SIZE=3D2>From: Stuart Cheshire =
&lt;cheshire@apple.com&gt;</FONT>
<BR><FONT SIZE=3D2>To: &quot;Erik Nordmark&quot; =
&lt;Erik.Nordmark@sun.com&gt;</FONT>
<BR><FONT SIZE=3D2>Cc: &lt;zeroconf@merit.edu&gt;</FONT>
<BR><FONT SIZE=3D2>Date: Fri, 13 Dec 2002 18:45:26 -0800</FONT>
<BR><FONT SIZE=3D2>Subject: Re: IESG =
draft-cheshire-ipv4-acd-02.txt</FONT>
</P>

<P><FONT SIZE=3D2>At last, a reply that actually relates to the subject =
line.</FONT>
</P>

<P><FONT SIZE=3D2>&gt;&gt; &gt; But the ongoing conflict detection =
(causing</FONT>
<BR><FONT SIZE=3D2>&gt;&gt; &gt; IP address change when a conflict =
appears) and broadcast replies looks</FONT>
<BR><FONT SIZE=3D2>&gt;&gt; &gt; more like a useful experiment to =
me.</FONT>
<BR><FONT SIZE=3D2>&gt;&gt; </FONT>
<BR><FONT SIZE=3D2>&gt;&gt; It has been a five-year experiment by =
Apple.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt;Do you have a pointer to the data that has been =
collected as part of</FONT>
<BR><FONT SIZE=3D2>&gt;that experiment?</FONT>
</P>

<P><FONT SIZE=3D2>There is no data. That's the point. After shipping =
millions of machines </FONT>
<BR><FONT SIZE=3D2>per year for five years, the number of reported =
problems is zero.</FONT>
</P>

<P><FONT SIZE=3D2>&gt;How about adding</FONT>
<BR><FONT SIZE=3D2>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; This =
document updates RFC 826 and RFC 2132.</FONT>
</P>

<P><FONT SIZE=3D2>I added a header line that says &quot;Updates: 826, =
2132&quot;</FONT>
</P>

<P><FONT SIZE=3D2>&gt;RFC 2131 actually talks about an ARP reply and =
not the ARP request</FONT>
<BR><FONT SIZE=3D2>&gt;with sender=3Dtarget. See section 4.4.1 in RFC =
2131.</FONT>
<BR><FONT SIZE=3D2>&gt;So you don't seem to be consistent with RFC =
2131.</FONT>
</P>

<P><FONT SIZE=3D2>Stevens describes using ARP request.</FONT>
<BR><FONT SIZE=3D2>BSD broadcasts an ARP request to announce its =
address.</FONT>
<BR><FONT SIZE=3D2>Mac OS 9 broadcasts an ARP request to announce its =
address.</FONT>
<BR><FONT SIZE=3D2>Mac OS X broadcasts an ARP request to announce its =
address.</FONT>
<BR><FONT SIZE=3D2>Windows broadcasts an ARP request to announce its =
address.</FONT>
</P>

<P><FONT SIZE=3D2>RFC 2131 describes broadcasting an ARP reply, but =
like many things in RFC </FONT>
<BR><FONT SIZE=3D2>2131, this is probably a typo. As has been pointed =
out many times by many </FONT>
<BR><FONT SIZE=3D2>people, broadcasting an ARP reply is unconventional, =
and best avoided </FONT>
<BR><FONT SIZE=3D2>where not necessary. Therefore I avoided it and =
followed the behaviour </FONT>
<BR><FONT SIZE=3D2>described by Stevens (and implemented on Mac, =
Windows, Unix, etc.) </FONT>
<BR><FONT SIZE=3D2>instead.</FONT>
</P>

<P><FONT SIZE=3D2>In any case, the &quot;Packet Reception&quot; rules =
of RFC 826 are exceedingly </FONT>
<BR><FONT SIZE=3D2>clear that checking the packet opcode is the *last* =
check that is done, </FONT>
<BR><FONT SIZE=3D2>after all other packet processing has been =
completed.</FONT>
</P>

<P><FONT SIZE=3D2>Do you have a technical opinion to offer about which =
you think is best?</FONT>
</P>

<P><FONT SIZE=3D2>&gt;I wasn't suggesting a normative reference; that =
isn't needed since the</FONT>
<BR><FONT SIZE=3D2>&gt;document is self-contained. But pointing out the =
relationship using a</FONT>
<BR><FONT SIZE=3D2>&gt;non-normative reference to draft-ietf-zeroconf-ip=
v6-link-local would be </FONT>
<BR><FONT SIZE=3D2>&gt;useful for the implementors that are going to =
implement both.</FONT>
</P>

<P><FONT SIZE=3D2>There is already a non-normative reference to the =
v4ll draft.</FONT>
</P>

<P><FONT SIZE=3D2>If there is specific text you'd like to see in the =
draft, I'd be happy to </FONT>
<BR><FONT SIZE=3D2>consider any suggestions you wish to offer.</FONT>
</P>

<P><FONT SIZE=3D2>&gt;&gt;&nbsp;&nbsp;&nbsp; At any time, if a =
host</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;&nbsp;&nbsp;&nbsp; receives an ARP packet =
(request *or* reply) where the 'sender IP</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;&nbsp;&nbsp;&nbsp; address' is the host's =
own IP address, but the 'sender hardware</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;&nbsp;&nbsp;&nbsp; address' does not match =
any of the host's own interface addresses,</FONT>
<BR><FONT SIZE=3D2>&gt;&gt;&nbsp;&nbsp;&nbsp; then this is a =
conflicting ARP packet</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt;I fail to find the word &quot;multihoming&quot; =
or any explicit mention of</FONT>
<BR><FONT SIZE=3D2>&gt;multiple interfaces in the above text.</FONT>
</P>

<P><FONT SIZE=3D2>The phrase, &quot;any of the host's own interface =
addresses&quot; is a mention of </FONT>
<BR><FONT SIZE=3D2>multiple interfaces.</FONT>
</P>

<P><FONT SIZE=3D2>If there is specific text you'd like to see in the =
draft, I'd be happy to </FONT>
<BR><FONT SIZE=3D2>consider any suggestions you wish to offer.</FONT>
</P>

<P><FONT SIZE=3D2>&gt;&gt; &gt; I would assume that ACD can </FONT>
<BR><FONT SIZE=3D2>&gt;&gt; &gt; operate independently for each =
interface even though v4LL has some </FONT>
<BR><FONT SIZE=3D2>&gt;&gt; &gt; extra stuff related to multi-interface =
nodes.</FONT>
<BR><FONT SIZE=3D2>&gt;&gt; </FONT>
<BR><FONT SIZE=3D2>&gt;&gt; No, the specification needs to deal with =
the case when a host has two </FONT>
<BR><FONT SIZE=3D2>&gt;&gt; interfaces (say wireless and Ethernet) on =
the same link.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt;And you claim you can't do that by having the =
interfaces be configured</FONT>
<BR><FONT SIZE=3D2>&gt;independently of eachother?</FONT>
</P>

<P><FONT SIZE=3D2>If there is specific text you'd like to see in the =
draft, I'd be happy to </FONT>
<BR><FONT SIZE=3D2>consider any suggestions you wish to offer.</FONT>
</P>

<P><FONT SIZE=3D2>&gt;I think my conclusion was that the time should be =
shorter</FONT>
<BR><FONT SIZE=3D2>&gt;than 8 seconds and not longer. 8 seconds is a =
useless compromise</FONT>
<BR><FONT SIZE=3D2>&gt;as far as I can tell since it is unecessarily =
long when STP isn't triggered</FONT>
<BR><FONT SIZE=3D2>&gt;and too short when STP is triggered (with out of =
the box bridge</FONT>
<BR><FONT SIZE=3D2>&gt;configurations.) Thus 2 or 3 seconds should be =
fine.</FONT>
</P>

<P><FONT SIZE=3D2>The document already has specific text allowing =
shorter timeouts in cases </FONT>
<BR><FONT SIZE=3D2>where the implementer has reason to believe that is =
a wise design choice.</FONT>
</P>

<P><FONT SIZE=3D2>The document already has specific text describing how =
the individual </FONT>
<BR><FONT SIZE=3D2>choice of timeout doesn't have any impact on =
interoperability with other </FONT>
<BR><FONT SIZE=3D2>devices.</FONT>
</P>

<P><FONT SIZE=3D2>If there is specific text you'd like to see in the =
draft, I'd be happy to </FONT>
<BR><FONT SIZE=3D2>consider any suggestions you wish to offer.</FONT>
</P>

<P><FONT SIZE=3D2>&gt;&gt; Most network operators today, with good =
reason, set their port blocking </FONT>
<BR><FONT SIZE=3D2>&gt;&gt; time to five seconds.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt;Doesn't match my experience. And doesn't match =
the IEEE 802.1D </FONT>
<BR><FONT SIZE=3D2>&gt;recommendation.</FONT>
</P>

<P><FONT SIZE=3D2>If there is specific text you'd like to see in the =
draft, I'd be happy to </FONT>
<BR><FONT SIZE=3D2>consider any suggestions you wish to offer.</FONT>
</P>

<P><FONT SIZE=3D2>&gt;Is there a way for the host to reliably detect =
whether the switches run </FONT>
<BR><FONT SIZE=3D2>&gt;RSTP instead of STP?</FONT>
</P>

<P><FONT SIZE=3D2>Quoting from Mick Seaman: &quot;Yes, the driver can =
easily tell the difference </FONT>
<BR><FONT SIZE=3D2>between an RSTP and an STP BPDU, they are different =
'BPDU types', a type </FONT>
<BR><FONT SIZE=3D2>field being defined in the BPDU format.&quot;</FONT>
</P>

<P><FONT SIZE=3D2>If there is specific text you'd like to see in the =
draft, I'd be happy to </FONT>
<BR><FONT SIZE=3D2>consider any suggestions you wish to offer.</FONT>
</P>

<P><FONT SIZE=3D2>&gt;&gt; A Zero Configuration device may want to make =
use of address conflict </FONT>
<BR><FONT SIZE=3D2>&gt;&gt; detection. If address conflict detection =
requires a mandatory </FONT>
<BR><FONT SIZE=3D2>&gt;&gt; user-configuration option, then that means =
that Zero Configuration </FONT>
<BR><FONT SIZE=3D2>&gt;&gt; devices require mandatory =
user-configuration options, a </FONT>
<BR><FONT SIZE=3D2>&gt;&gt; self-contradiction.</FONT>
<BR><FONT SIZE=3D2>&gt;</FONT>
<BR><FONT SIZE=3D2>&gt;I'd understand that comment if it was about =
</FONT>
<BR><FONT SIZE=3D2>&gt;draft-ietf-zeroconf-ipv4-link-local</FONT>
<BR><FONT SIZE=3D2>&gt;but not about the ACD document. Since the =
addresses are configured either</FONT>
<BR><FONT SIZE=3D2>&gt;manually or by DHCP (or some other provisioning =
protocol) it is possible to</FONT>
<BR><FONT SIZE=3D2>&gt;add a knob in the manual config or in DHCP, =
respectively. So I don't</FONT>
<BR><FONT SIZE=3D2>&gt;understand the issue your are concerned =
about.</FONT>
</P>

<P><FONT SIZE=3D2>I don't understand why you think there is a =
problem.</FONT>
</P>

<P><FONT SIZE=3D2>DHCP clients have done address conflict detection for =
years, and no one </FONT>
<BR><FONT SIZE=3D2>has asked for an option to disable address conflict =
detection there.</FONT>
</P>

<P><FONT SIZE=3D2>Macs have done address conflict detection for manual =
addresses for years, </FONT>
<BR><FONT SIZE=3D2>and no one has asked for an option to disable that =
either.</FONT>
</P>

<P><FONT SIZE=3D2>Even Windows tells you if you manually set your IP =
address to an address </FONT>
<BR><FONT SIZE=3D2>that's already in use.</FONT>
</P>

<P><FONT SIZE=3D2>If you've ever struggled with a network where two =
machines were set to </FONT>
<BR><FONT SIZE=3D2>the same IP address, you'd think it insane to ever =
think you'd NOT want </FONT>
<BR><FONT SIZE=3D2>to get all the help you can to diagnose and fix that =
problem.</FONT>
</P>

<P><FONT SIZE=3D2>I don't understand why now, after all these years of =
successful address </FONT>
<BR><FONT SIZE=3D2>conflict detection that no one ever complained =
about, there's suddenly a </FONT>
<BR><FONT SIZE=3D2>feeling that we need manual configuration options to =
disable it.</FONT>
</P>

<P><FONT SIZE=3D2>Stuart Cheshire &lt;cheshire@apple.com&gt;</FONT>
<BR><FONT SIZE=3D2>&nbsp;* Wizard Without Portfolio, Apple Computer, =
Inc.</FONT>
<BR><FONT SIZE=3D2>&nbsp;* Chairman, IETF Zeroconf</FONT>
<BR><FONT SIZE=3D2>&nbsp;* www.stuartcheshire.org</FONT>
</P>

<P><FONT SIZE=3D2>- ------- End of Forwarded Message</FONT>
</P>

<P><FONT =
SIZE=3D2>_______________________________________________</FONT>
<BR><FONT SIZE=3D2>dhcwg mailing list</FONT>
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From dhcwg-admin@ietf.org  Wed Dec 18 13:24:38 2002
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Subject: [dhcwg] win98 no release date
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Hello.
I am curious to know if anyone knows what is responsible for win98
workstations getting an ip address from dhcp. However the workstation looses
connectivity and when looking at the winipcfg it has no release date set. A
manual release and renew cures this but is terribly distressful for my
users.

This is a seemingly random occurance, I have re-installed tcp/ip protocol
and OS in an effort to cure this but to no avail.

Any info is greatly appreciated.
Thanks
Lori

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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Dynamic Host Configuration Working Group of the IETF.

	Title		: DHCP Options for Internet Storage Name Service
	Author(s)	: J. Tseng et al.
	Filename	: draft-ietf-dhc-isnsoption-04.txt,.pdf
	Pages		: 13
	Date		: 2002-12-18
	
This document describes the DHCP option to allow iSNS clients using
DHCP to automatically discover the location of the iSNS server. iSNS
provides discovery and management capabilities for iSCSI and Fibre
Channel storage devices in an enterprise-scale IP storage network.
iSNS provides intelligent storage management services comparable to
those found in Fibre Channel networks, allowing a commodity IP
network to function in a similar capacity as a storage area network.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-dhc-isnsoption-04.txt

To remove yourself from the IETF Announcement list, send a message to 
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Internet-Drafts are also available by anonymous FTP. Login with the username
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type "cd internet-drafts" and then
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From dhcwg-admin@ietf.org  Fri Dec 20 10:50:18 2002
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To: Paul Duffy <paduffy@cisco.com>
cc: dhcwg@ietf.org
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt 
In-Reply-To: Message from Paul Duffy <paduffy@cisco.com> 
   of "Tue, 22 Oct 2002 22:43:58 EDT." <4.3.2.7.2.20021022180633.04fd38a8@funnel.cisco.com> 
Date: Fri, 20 Dec 2002 10:47:42 -0500
From: Thomas Narten <narten@us.ibm.com>
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I was about to put this document back before the IESG formally, but I
notice that the IANA considerations section still talks about future
cablelabs suboptions being assigned via "expert review". I thought
there was agreement to make this "IETF Consensus". I.e., see:

http://www1.ietf.org/mail-archive/working-groups/dhcwg/current/msg01416.html

I haven't checked the other edits carefully. Is this document *really*
ready for advancement, or did some other things get left out?

Also, general comment (not to single this ID out, though it occurs
here). When making changes to documents in response to issues that
have been raised (especially on the mailing list), it is generally
preferable to respond to such comments not just by saying "OK, will be
fixed in the next rev", but by saying "OK, here are the text changes I
propose -- do they look OK?"

The advantage of this approach is you get instant review/feedback on
whether the changes are ideal. I mention this here because  there was
discussion about whether to include a normative reference to the
dhc-concat draft, in the case where options are too long to fit in a
single option. There was no indication on the mailing list that this
change would be made, but there is new text to that effect in the
document:

   {+When the total length of a CCC option exceeds 255 octets, the 
   procedure outlined in [4] SHOULD be employed to split the option into 
   multiple, smaller options.+} 
    
My immediate reaction to the text is that this should be a MUST, not a
SHOULD. If one goes and reads the definition of SHOULD, it say:

> 3. SHOULD   This word, or the adjective "RECOMMENDED", mean that there
>    may exist valid reasons in particular circumstances to ignore a
>    particular item, but the full implications must be understood and
>    carefully weighed before choosing a different course.

In this case, if the CCC option exceeds 255, under what conditions
should the SHOULD be ignored? I can't think if any right off.

It would have been more efficient to have iterated on this text on the
mailing list the point the issue orignally came up. That way, we might
have avoided the need for another revision of the document. Note that
the same applies for the point above that seems to have been missed.

Thomas
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From dhcwg-admin@ietf.org  Fri Dec 20 12:46:57 2002
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Date: Fri, 20 Dec 2002 12:47:08 -0500
To: Thomas Narten <narten@us.ibm.com>
From: Paul Duffy <paduffy@cisco.com>
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt 
Cc: dhcwg@ietf.org
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Hello Thomas,

Please be aware that a rev 5 was sent to internet-drafts and to yourself 
several weeks back...it still has not appeared in the DHC WG list.  It 
looks like you're still looking at rev 4.  I will re-send the email.

At 10:47 AM 12/20/2002 -0500, Thomas Narten wrote:
>I was about to put this document back before the IESG formally, but I
>notice that the IANA considerations section still talks about future
>cablelabs suboptions being assigned via "expert review". I thought
>there was agreement to make this "IETF Consensus". I.e., see:
>
>http://www1.ietf.org/mail-archive/working-groups/dhcwg/current/msg01416.html
>
>I haven't checked the other edits carefully. Is this document *really*
>ready for advancement, or did some other things get left out?

This is not my understanding.  My understanding is that early on, with 
Ralph's guidance, we had general consensus for the text as it stands.  Some 
months later a couple questions were raised (noted above).

Cablelabs intends to place any new sub-option additions before IETF for 
approval (witness the recent submission of sub-option 51), but we STRONGLY 
would prefer to be allowed to assign the sub-option codes.  It will make 
life a bit easier for the component manufacturers, compliance testing, etc.

>Also, general comment (not to single this ID out, though it occurs
>here). When making changes to documents in response to issues that
>have been raised (especially on the mailing list), it is generally
>preferable to respond to such comments not just by saying "OK, will be
>fixed in the next rev", but by saying "OK, here are the text changes I
>propose -- do they look OK?"
>
>The advantage of this approach is you get instant review/feedback on
>whether the changes are ideal. I mention this here because  there was
>discussion about whether to include a normative reference to the
>dhc-concat draft, in the case where options are too long to fit in a
>single option. There was no indication on the mailing list that this
>change would be made, but there is new text to that effect in the
>document:

I will adhere to these recommendations in any further correspondence with 
the list.  I would also suggest that this be added to the authors guidelines.

>    {+When the total length of a CCC option exceeds 255 octets, the
>    procedure outlined in [4] SHOULD be employed to split the option into
>    multiple, smaller options.+}
>
>My immediate reaction to the text is that this should be a MUST, not a
>SHOULD. If one goes and reads the definition of SHOULD, it say:
>
> > 3. SHOULD   This word, or the adjective "RECOMMENDED", mean that there
> >    may exist valid reasons in particular circumstances to ignore a
> >    particular item, but the full implications must be understood and
> >    carefully weighed before choosing a different course.
>
>In this case, if the CCC option exceeds 255, under what conditions
>should the SHOULD be ignored? I can't think if any right off.

The SHOULD resulted from discussions with the device manufacturers.  The 
intent of the SHOULD was to accommodate devices that existed long before 
this RFC.  By making this a MUST, these devices will be 
non-compliant.  PacketCable has been in the works for several years...early 
field trials are starting.

Helps ?  Please lets keep this discussion going.  With your help, I want to 
close this draft/RFC up ASAP.

Cheers,


>It would have been more efficient to have iterated on this text on the
>mailing list the point the issue orignally came up. That way, we might
>have avoided the need for another revision of the document. Note that
>the same applies for the point above that seems to have been missed.
>Thomas
>_______________________________________________
>dhcwg mailing list
>dhcwg@ietf.org
>https://www1.ietf.org/mailman/listinfo/dhcwg

--

Paul Duffy
Cisco Systems, Inc.
paduffy@cisco.com


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From dhcwg-admin@ietf.org  Fri Dec 20 12:49:32 2002
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Subject: [dhcwg] Cablelabs Client Configuration Option - draft 5.
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--=====================_266005525==_
Content-Type: text/plain; charset="us-ascii"; format=flowed

Please accept the following updated draft for consideration by the DHC 
working group.

The prior version of this draft (4) has just emerged from Last Call, during 
which several changes were requested.  The attached draft contains all 
these change requests.

1. Sub-option 3 now assigns IP type = 1, FQDN type = 0 (per RFC 3361 
convention).

2. Section 13 "valid" changed to "invalid".

3. Reference 14.1.4 is now updated to its proper RFC designation.

4. References 14.2.7 and .8 are updated to proper documents.

Thank You, 
--=====================_266005525==_
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   Internet Engineering Task Force                    B. Beser 
   INTERNET DRAFT                                     Juniper Networks 
   DHC Working Group                                  P. Duffy (ed.) 
   Document: draft-ietf-dhc-packetcable-05.txt        Cisco Systems 
                                                      December 2002 
        
              DHCP Option for CableLabs Client Configuration 
    
    
   1.   Status of this Memo 
    
   This document is an Internet-Draft and is in full conformance with 
   all provisions of Section 10 of RFC 2026. 
    
   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. 
    
   2.   Abstract 
    
   This document defines a DHCP option that will be used to configure 
   various devices deployed within CableLabs architectures.  
   Specifically, the document describes DHCP option content that will be 
   used to configure one class of CableLabs client device: a PacketCable 
   Media Terminal Adapter (MTA).  The option content defined within this 
   document will be extended as future CableLabs client devices are 
   developed. 
    
   3.   Table of Contents 
    
   1.   Status of this Memo..........................................1 
   2.   Abstract.....................................................1 
   3.   Table of Contents............................................1 
   4.   Conventions used in this document............................2 
   5.   Terminology..................................................2 
   6.   Introduction.................................................2 
   7.   CableLabs Client Configuration Option Format.................4 
   8.   CableLabs Client Configuration Option: Sub-Option Definitions 5 
   8.1.   TSP's DHCP Server Address Sub-Options.......................5 
 
  Beser & Duffy                                                     1 
  Internet Draft  DHCP Option for CableLabs Clients     December 2002 
 
   8.2.   TSP's Provisioning Server Address Sub-Option................5 
   8.3.   TSP's AS-REQ/AS-REP Backoff and Retry.......................6 
   8.4.   TSP's AP-REQ/AP-REP Backoff and Retry.......................7 
   8.5.   TSP's Kerberos Realm Name Sub-Option........................7 
   8.6.   TSP's Ticket Granting Server Utilization Sub-Option.........8 
   8.7.   TSP's Provisioning Timer Sub-Option.........................8 
   9.   Informational Description of CCC Option Usage................8 
   10.  IANA Considerations..........................................9 
   11.  Legacy Use Information.......................................9 
   12.  Procedure for Adding Additional Sub-options..................9 
   13.  Security Considerations......................................9 
   14.  References..................................................10 
   15.  Acknowledgments.............................................11 
   16.  Author's Addresses..........................................11 
   17.  Full Copyright Statement....................................11 
 
    
   4.   Conventions used in this document 
    
   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 
   "SHOULD", "SHOULD NOT", "RECOMMENDED",  "MAY", and "OPTIONAL" in 
   this document are to be interpreted as described in RFC 2119 [1]. 
    
   5.   Terminology 
    
   Definitions of terms used throughout this document: 
        
      *  "Telephony Service Provider" or "TSP" 
    
   The business entity from which a subscriber receives telephony 
   service. 
    
   See RFC 2131[6] for additional DHCP terminology. 
    
   6.   Introduction  
        
   Cable Television Laboratories, Inc. (CableLabs) is a non-profit 
   research and development consortium that serves the cable television 
   industry via design and specification of new and emerging broadband 
   service architectures. Several CableLabs initiatives define DHCP 
   clients that have specific DHCP configuration requirements.  One such 
   initiative is the PacketCable project. 
    
   The PacketCable project is aimed at architecting, qualifying, and 
   supporting Internet-based multimedia services over cable-based packet 
   networks. These new multimedia services will include telephony and 
   videoconferencing, delivered using the basic Internet Protocol (IP) 
   technology that is used to send data via the Internet.  
    
 
  Beser & Duffy           Expires June 2003                         2 
  Internet Draft  DHCP Option for CableLabs Clients     December 2002 
 
   PacketCable 1.0 provides Voice over IP (VoIP) service delivery. The 
   VoIP service is supported at the customer site by two key components:  
   a Cable Modem (CM) and a Media Terminal Adapter (MTA).  The CM 
   converts the cable RF signals to/from various IP voice protocols, 
   while the MTA converts the VoIP protocols into analog telephony 
   compatible with a common telephone. 
    
   The CM and MTA may be packaged together or separately.  If packaged 
   together, the unit is referred to as an Embedded-MTA (EMTA - depicted 
   in Figure 1). If packaged separately, the MTA is referred to as a 
   Standalone MTA (SMTA).  
    
    
              |----------------------------------------------|  
              |                                              |  
              |   |-----------|           |-------------|    |  
              |   |           |           |             |    |  
    Telephony |   |  Media    | internal  |   Cable     |    | RF Link  
    ---------_|---| Terminal  |===========|   Modem     |----|-------  
    Link      |   | Adapter   | connection|             |    |  
              |   |-----------|           |-------------|    |  
              |                                              |  
              |----------------------------------------------|  
        
                     Figure 1. PacketCable 1.0 Embedded-MTA  
                                                 
   The CM and MTA are distinct IP devices: each has its own MAC address 
   and IP configuration. The CM and MTA utilize the DHCP protocol to 
   obtain IP configuration. It is assumed that the CM and MTA may be 
   administered by different business entities.  The CM communicates 
   with and is configured by the data access provider's DHCP servers.  
   Likewise, the MTA communicates with and is configured by the 
   Telephony Service Provider's (TSP's) DHCP servers. 
    
   The PacketCable architecture requires that the business entity 
   controlling configuration of the CM also determines which business 
   entities control the configuration of the MTA.  This is similar to 
   the example found in the PSTN system: individuals can pick their long 
   distance carriers even though the ultimate control of their telephone 
   remains with the local carrier.  
    
   Due to specific needs of the MTA configuration process (described in 
   [7]), a new CableLabs Client Configuration (CCC) option is needed for 
   the DHCP protocol.  Both CM and MTA DHCP clients will request this 
   option.  When requested, both the CM and TSP DHCP servers will 
   populate this option into DHCP responses. See section 9 for further 
   operational details. 
    
   It should be noted that, although the CCC option will be initially 
   deployed to support PacketCable VOIP applications, the CCC option 
   will also be used to support various non VOIP applications. Use of 
   the CCC option does not necessarily mean that the service provider is 
   a TSP. 
        
 
  Beser & Duffy           Expires June 2003                         3 
  Internet Draft  DHCP Option for CableLabs Clients     December 2002 
 
   7.   CableLabs Client Configuration Option Format 
        
   The option begins with a tag octet containing the option code (code 
   TBD). A length octet follows the tag octet.  The value of the length 
   octet does not include itself or the tag octet. The length octet is 
   followed by "length" octets of sub-option content (total length, not 
   sub-option count).  The option layout is depicted below:  
     
      +------+--------+--------------+--------------+---+--------------+  
      | Code | Length | Sub-option 1 | Sub-option 2 |...| Sub-option n |  
      +------+--------+--------------+--------------+---+--------------+  
        
   When the total length of a CCC option exceeds 255 octets, the 
   procedure outlined in [4] SHOULD be employed to split the option into 
   multiple, smaller options. 
    
   A sub-option begins with a tag octet containing the sub-option code. 
   A length octet follows the tag octet.  The value of the length octet 
   does not include itself or the tag octet. The length octet is 
   followed by "length" octets of sub-option information.  The sub-
   option layout is depicted below: 
    
      +-------------------+--------+------------------------+  
      | Sub-option Code   | Length | Sub-option information |  
      +-------------------+--------+------------------------+  
    
   The sub-option codes are summarized below. 
        
      +---------+---------+--------------------------------------------+  
      |  Sub-   | Sent to | Description                                |  
      | option  |         |                                            | 
      |  Code   |         |                                            | 
      +===================+============================================+ 
      |    1    |  CM     | TSP's Primary DHCP Server Address          |  
      +---------+---------+--------------------------------------------+  
      |    2    |  CM     | TSP's Secondary DHCP Server Address        |  
      +---------+---------+--------------------------------------------+  
      |    3    |  MTA    | TSP's Provisioning Server Address          |  
      +---------+---------+--------------------------------------------+  
      |    4    |  MTA    | TSP's AS-REQ/AS-REP Backoff and Retry      |  
      +---------+---------+--------------------------------------------+  
      |    5    |  MTA    | TSP's AP-REQ/AP-REP Backoff and Retry      | 
      +---------+---------+--------------------------------------------+  
      |    6    |  MTA    | TSP's Kerberos Realm Name                  |  
      +---------+---------+--------------------------------------------+  
      |    7    |  MTA    | TSP's Ticket Granting Server Utilization   |  
      +---------+---------+--------------------------------------------+  
      |    8    |  MTA    | TSP's Provisioning Timer Value             |  
      +---------+---------+--------------------------------------------+  
      | 9 - 255 |         | Reserved for future extensions             | 
      +---------+---------+--------------------------------------------+  
    
 
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  Internet Draft  DHCP Option for CableLabs Clients     December 2002 
 
   8.   CableLabs Client Configuration Option: Sub-Option Definitions  
        
   The following sections provide detailed descriptions of each sub-
   option. There are a few general formatting rules: 
    
   - Fully Qualified Domain Names (FQDNs) MUST be encoded per RFC 1035 
     [3] section 3.1. Note that a terminating 0 is required.  Also note 
     that compression, as described in RFC 1035 [3] section 4.1.4, MUST 
     NOT be applied. 
   - IPv4 addresses MUST be encoded as 4 binary octets in network byte-
     order (high order byte first). 
   - All multi-octet quantities MUST be encoded per network byte-
     ordering. 
    
   8.1. TSP's DHCP Server Address Sub-Options 
        
   The TSP DHCP Server Address sub-options identify the DHCP servers 
   from which an MTA is permitted to accept a DHCP OFFER.  Sub-option 1 
   is the address of the TSP's primary DHCP server. Sub-option 2 is the 
   address of the TSP's secondary DHCP server. 
      
   The sub-option length MUST be 4 and the sub-option MUST include the 
   DHCP server's IPv4 address as follows:   
    
    
        Code  Len          Address 
      +-----+-----+-----+-----+-----+-----+  
      | 1/2 |  4  |  a1 |  a2 |  a3 |  a4 |    
      +-----+-----+-----+-----+-----+-----+  
    
        
                                         
   8.2. TSP's Provisioning Server Address Sub-Option 
        
   This option contains the address of the TSP's Provisioning server.  
   MTAs communicate with the Provisioning server at various stages in 
   their provisioning process.   
        
   The address can be configured as either an IPv4 address or as an 
   FQDN. The encoding of sub-option 3 will adhere to one of 2 formats. 
        
   1. IPv4 address. The sub-option length MUST be 5.  The length octet 
   MUST be followed by a single octet that indicates the specific 
   address type that follows.  This type octet MUST be set to 1 to 
   indicate an IPv4 address.  The type octet MUST be followed by 4 
   octets of IPv4 address:   
    
    
       Code   Len   Type        Address 
      +-----+-----+-----+-----+-----+-----+-----+  
      |  3  |  5  |  1  |  a1 |  a2 |  a3 |  a4 |    
      +-----+-----+-----+-----+-----+-----+-----+  
    
 
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  Internet Draft  DHCP Option for CableLabs Clients     December 2002 
 
        
    
        
   2. FQDN.  The length octet MUST be followed by a single octet that 
   indicates the specific address type that follows.  This type octet 
   MUST be set to 0 to indicate an FQDN.  The type octet MUST be 
   followed by the encoded FQDN: 
    
    
       Code   Len   Type            FQDN 
      +-----+-----+-----+-----+-----+   +-----+ 
      |  3  | n+1 |  0  |  f1 |  f2 |...|  fn | 
      +-----+-----+-----+-----+-----+   +-----+ 
        
 
 
   It is not anticipated that additional type codes, beyond IPv4 (1) and 
   FQDN (0), will be required.  Thus, IANA will not be required to 
   maintain a registry of type codes. 
      
   8.3. TSP's AS-REQ/AS-REP Backoff and Retry 
    
   This sub-option configures an MTA's Kerberos AS-REQ/AS-REP timeout, 
   backoff, and retry mechanism.   
    
   RFC-1510 [5] does not define a backoff/retry mechanism to be 
   employed when an AS-REQ/AS-REP message exchange fails. This sub-
   option contains parameters required by the backoff/retry mechanism 
   outlined in [8]. 
    
    
   The encoding of this sub-option is depicted below: 
    
    
      Code Len   Nom Timeout     Max Timeout     Max Retries 
      +---+---+---+---+---+---+---+---+---+---+---+---+---+---+ 
      | 4 |12 |n1 |n2 |n3 |n4 |m1 |m2 |m3 |m4 |r1 |r2 |r3 |r4 | 
      +---+---+---+---+---+---+---+---+---+---+---+---+---+---+ 
    
    
   The length octet of this sub-option MUST contain the value 12.   
    
   The length octet MUST be followed by 4 octets containing the AS-
   REQ/AS-REP nominal (initial) timeout value.  This value is a 32 bit 
   unsigned quantity in units of seconds. 
    
   The next 4 octets MUST contain the AS-REQ/AS-REP maximum timeout 
   value.  This value is a 32 bit unsigned quantity in units of seconds 
    
   The final 4 octets MUST contain the AS-REQ/AS-REP maximum retry 
   count.  This value is a 32 bit unsigned quantity. 
    
    
 
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  Internet Draft  DHCP Option for CableLabs Clients     December 2002 
 
   8.4. TSP's AP-REQ/AP-REP Backoff and Retry                 
    
   This sub-option configures an MTA's Kerberos AP-REQ/AP-REP timeout, 
   backoff, and retry mechanism. 
    
   RFC-1510 [5] does not define a backoff/retry mechanism to be 
   employed when an AP-REQ/AP-REP message exchange fails. This sub-
   option contains parameters required by the backoff/retry mechanism 
   outlined in [8]. 
    
    
   The encoding of this sub-option is depicted below: 
    
    
      Code Len   Nom Timeout     Max Timeout     Max Retries 
      +---+---+---+---+---+---+---+---+---+---+---+---+---+---+ 
      | 5 |12 |n1 |n2 |n3 |n4 |m1 |m2 |m3 |m4 |r1 |r2 |r3 |r4 | 
      +---+---+---+---+---+---+---+---+---+---+---+---+---+---+ 
    
    
   The length octet of this sub-option MUST contain the value 12.   
    
   The length octet MUST be followed by 4 octets containing the AP-
   REQ/AP-REP nominal (initial) timeout value.  This value is a 32 bit 
   unsigned quantity in units of seconds. 
    
   The next 4 octets MUST contain the AP-REQ/AP-REP maximum timeout 
   value.  This value is a 32 bit unsigned quantity in units of seconds. 
    
   The final 4 octets MUST contain the AP-REQ/AP-REP maximum retry 
   count.  This value is a 32 bit unsigned quantity. 
    
    
   8.5. TSP's Kerberos Realm Name Sub-Option  
        
   The PacketCable architecture requires an MTA to authenticate itself 
   to the TSP's network via the Kerberos protocol.  A Kerberos Realm 
   name is required at the MTA to permit a DNS lookup for the address of 
   the TSP's Kerberos Key Distribution Center (KDC) entity.  
            
   The Kerberos Realm name MUST be encoded per the domain style realm 
   name described in RFC 1510 [5].  This realm name MUST be all capital 
   letters and conform to the syntax described in RFC 1035 [3] section 
   3.1. The sub-option is encoded as follows: 
    
    
    
       Code   Len   Kerberos Realm Name     
      +-----+-----+-----+-----+   +-----+ 
      |  6  |  n  |  k1 |  k2 |...|  kn | 
      +-----+-----+-----+-----+   +-----+ 
    
       
      
 
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  Internet Draft  DHCP Option for CableLabs Clients     December 2002 
 
   8.6. TSP's Ticket Granting Server Utilization Sub-Option 
    
   This sub-option encodes a boolean value which indicates whether an 
   MTA should or should not utilize a TGT (Ticket Granting Ticket) when 
   obtaining a service ticket for one of the PacketCable application 
   servers. The encoding is as follows:  
    
    
       Code   Len   Value  
      +-----+-----+-----+  
      |  7  |  1  | 1/0 |  
      +-----+-----+-----+  
    
    
   The length MUST be 1.  The last octet contains a Boolean value which 
   MUST be either 0 or 1.  A value of 1 MUST be interpreted as true.  A 
   value of 0 MUST be interpreted as false.  
        
    
   8.7. TSP's Provisioning Timer Sub-Option 
        
   The provisioning timer defines the maximum time allowed for the MTA 
   provisioning process to complete. If this timer expires before the 
   MTA has completed the provisioning process, the MTA should reset the 
   timer and re-start its provisioning process from the beginning.  
        
   The sub-option length MUST be 1 and a value between 1 and 30 
   (minutes, inclusive) MUST be used. If any other value is specified, 
   the MTA MUST treat the sub-option as non-populated.  
    
    
       Code   Len    Value    
      +-----+-----+---------+  
      |  8  |  1  | (1..30) |  
      +-----+-----+---------+  
        
    
    
   9.   Informational Description of CCC Option Usage.  
    
   Cablelabs client devices issue DHCP requests that include DHCP 
   options 55 (Parameter Request List) and 60 (Vendor Class 
   Identifier).  Option 55 will request the CCC option from the DHCP 
   server.  Option 60 will indicate the specific Cablelabs client 
   device type, thus directing the DHCP server to populate specific CCC 
   sub-option content in its responses.  The details of which CCC sub-
   options are populated for each specific client type are specified in 
   various Cablelabs project specifications. For example, specific 
   usage of the CCC option for the PacketCable project is described in 
   [7].  
    
   Note that client devices never populate the CCC option in their DHCP 
   requests.   
 
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  Internet Draft  DHCP Option for CableLabs Clients     December 2002 
 
 
    
   10.  IANA Considerations 
 
   IANA has assigned a value of TBD for the DHCP option code described 
   in this document. 
 
   11.  Legacy Use Information  
        
   The CableLabs Client Configuration option initially used the site-
   specific option value of 177 (0xB1). The use of the site-specific 
   option is to be deprecated when IANA issues an official option 
   number.  
            
   12.  Procedure for Adding Additional Sub-options  
        
   IANA is requested to maintain a new number space of "CableLabs 
   Client Configuration Sub-options", located in the BOOTP-DHCP 
   Parameters Registry.  The initial sub-option codes are described in 
   sections of this document. 
    
   IANA is requested to register codes for future CableLabs Client 
   Configuration Sub-options with an "Expert Review" approval policy as 
   described in RFC 2434 [2]. Future proposed sub-options will be 
   assigned a numeric code chosen by CableLabs, which will be 
   documented in the Internet Drafts that describe the sub-options. The 
   code assignment will be reviewed by a designated expert from the 
   IETF prior to publication in an RFC. 
 
           
   13.  Security Considerations  
        
    
   Potential exposures to attack in the DHCP protocol are discussed in 
   section 7 of the DHCP protocol specification [6] and in 
   Authentication for DHCP Messages [9]. 
    
   The CCC option can be used to misdirect network traffic by providing 
   incorrect DHCP server addresses, incorrect provisioning server 
   addresses, and incorrect Kerberos realm names to a Cablelabs client 
   device.  This misdirection can lead to several threat scenarios.  A 
   Denial of Service (DoS) attack can result from address information 
   being simply invalid.  A man-in-the-middle attack can be mounted by 
   providing addresses to a potential snooper.  A malicious TSP can 
   steal customers from the customer selected TSP, by altering the 
   Kerberos realm designation. 
    
   These threats are mitigated by several factors.   
    
   Within the cable delivery architecture required by PacketCable, the 
   DHCP client is connected to a network through a cable modem and the 
   CMTS (head-end). The CMTS is explicitly configured with a set of 
 
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  Internet Draft  DHCP Option for CableLabs Clients     December 2002 
 
   DHCP servers to which DHCP requests are forwarded.  Further, a 
   correctly configured CMTS will only allow downstream traffic from 
   specific IP addresses/ranges.  
    
   Assuming that server addresses and Kerberos realm name were 
   successfully spoofed to the point that a malicious client device was 
   able to contact a KDC, the client device must still present valid 
   certificates to the KDC before being service enabled.  Given the 
   computational overhead of the certificate validation process, this 
   situation could present a DoS opportunity. 
    
   Finally, it is possible for a malicious (although certified) TSP to 
   redirect a customer from the customer's selected TSP.  It is assumed 
   that all TSP's permitted onto an access providers network are 
   trusted entities that will cooperate to insure peaceful coexistence.  
   If a TSP is found to be redirecting customers, this should be 
   handled as an administrative matter between the access provider and 
   the TSP. 
    
    
   14.  References  
        
   14.1. Normative 
       
   1. S. Bradner, "Key words for use in RFCs to Indicate Requirement 
   Levels", BCP 14, RFC 2119, March 1997.  
        
   2. T. Narten and H. Alvestrand, "Guidelines for Writing an IANA 
   Considerations Section in RFCs", RFC 2434, October 1998. 
     
   3. P. Mockapetris, "Domain Names - Implementation and Specification 
   ", RFC 1035, November 1987 
    
   4. T. Lemon and S. Cheshire, "Encoding Long Options in the Dynamic 
   Host Configuration Protocol (DHCPv4)", RFC 3396, November 2002. 
    
   5. J. Kohl and C. Neuman, "The Kerberos Network Authentication 
   Service (V5)", RFC 1510, September 1993. 
    
   6. R. Droms, "Dynamic Host Configuration Protocol", RFC 2131, March 
   1997.  
               
       
   14.2. Informational 
    
   7. "PacketCable MTA Device Provisioning Specification", PKT-SP-PROV-
   I05-021127.  http://www.packetcable.com/specifications.html 
    
    
   8. "PacketCable Security Specification", PKT-SP-SEC-I07-021127, 
   http://www.packetcable.com/specifications.html  
    
 
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  Internet Draft  DHCP Option for CableLabs Clients     December 2002 
 
   9. R. Droms and W. Arbaugh, "Authentication for DHCP Messages", RFC 
   3118, June 2001 
    
   15.  Acknowledgments  
        
   The authors would like to extend a heartfelt thanks to all those who 
   contributed to the development of the PacketCable Provisioning 
   specifications:  
    
   Sumanth Channabasappa (Alopa Networks); Angela Lyda, Rick Morris, 
   Rodney Osborne (Arris Interactive); Steven Bellovin and Chris Melle 
   (AT&T); Eugene Nechamkin (Broadcom); John Berg, Maria Stachelek, 
   Matt Osman (CableLabs); Klaus Hermanns, Azita Kia, Michael Thomas, 
   Paul Duffy (Cisco); Deepak Patil (Com21); Jeff Ollis, Rick Vetter 
   (General Instrument/Motorola); Roger Loots, David Walters (Lucent); 
   Peter Bates (Telcordia); Patrick Meehan (Tellabs); Satish Kumar, 
   Itay Sherman, Roy Spitzer (Telogy/TI), Aviv Goren (Terayon); 
   Prithivraj Narayanan (Wipro); and Rich Woundy (AT&T Broadband). 
    
   16.  Author's Addresses  
        
   Burcak Beser  
   Juniper Networks  
   1194 North Matilda Avenue  
   Sunnyvale, CA, 94089  
   Email: burcak@juniper.net  
    
   Paul Duffy 
   Cisco Systems 
   300 Apollo Drive 
   Chelmsford, MA, 01824 
   Email: paduffy@cisco.com 
    
   17.  Full Copyright Statement 
    
   Copyright (C) The Internet Society (2002).  All Rights Reserved. 
    
   This document and translations of it may be copied and furnished to 
   others, and derivative works that comment on or otherwise explain it 
   or assist in its implementation may be prepared, copied, published 
   and distributed, in whole or in part, without restriction of any 
   kind, provided that the above copyright notice and this paragraph 
   are included on all such copies and derivative works.  However, this 
   document itself may not be modified in any way, such as by removing 
   the copyright notice or references to the Internet Society or other 
   Internet organizations, except as needed for the purpose of 
   developing Internet standards in which case the procedures for 
   copyrights defined in the Internet Standards process must be 
   followed, or as required to translate it into languages other than 
   English. 
    
   The limited permissions granted above are perpetual and will not be 
   revoked by the Internet Society or its successors or assigns. 
 
  Beser & Duffy           Expires June 2003                        11 
  Internet Draft  DHCP Option for CableLabs Clients     December 2002 
 
    
   This document and the information contained herein is provided on an 
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING 
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING 
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION 
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF 
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 
 
   Acknowledgement 
    
   Funding for the RFC Editor function is currently provided by the 
   Internet Society. 
       
     
    
 
  Beser & Duffy           Expires June 2003                        12 
--=====================_266005525==_
Content-Type: text/plain; charset="us-ascii"; format=flowed

--

Paul Duffy
Cisco Systems, Inc.
paduffy@cisco.com


--=====================_266005525==_--

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From dhcwg-admin@ietf.org  Fri Dec 20 12:52:36 2002
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To: Paul Duffy <paduffy@cisco.com>
cc: dhcwg@ietf.org
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt 
In-Reply-To: Message from Paul Duffy <paduffy@cisco.com> 
   of "Fri, 20 Dec 2002 12:47:08 EST." <4.3.2.7.2.20021220115411.02af9638@funnel.cisco.com> 
Date: Fri, 20 Dec 2002 12:49:14 -0500
From: Thomas Narten <narten@us.ibm.com>
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> Please be aware that a rev 5 was sent to internet-drafts and to yourself 
> several weeks back...it still has not appeared in the DHC WG list.

You're right. For some reason it hasn't appeared yet. Assume it got
lost and needs to be resubmitted....

> It looks like you're still looking at rev 4.  I will re-send the
> email.

The version 05 document (that I have now found my private copy of)
seems to have the same issues I mentioned in my earlier note. 

Thomas
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Date: Fri, 20 Dec 2002 13:04:50 -0500
To: Thomas Narten <narten@us.ibm.com>
From: Paul Duffy <paduffy@cisco.com>
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt 
Cc: dhcwg@ietf.org
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At 12:49 PM 12/20/2002 -0500, Thomas Narten wrote:
> > Please be aware that a rev 5 was sent to internet-drafts and to yourself
> > several weeks back...it still has not appeared in the DHC WG list.
>
>You're right. For some reason it hasn't appeared yet. Assume it got
>lost and needs to be resubmitted....
>
> > It looks like you're still looking at rev 4.  I will re-send the
> > email.
>
>The version 05 document (that I have now found my private copy of)
>seems to have the same issues I mentioned in my earlier note.

We need to get Ralph involved re: IANA considerations section.

What's your feeling re: my discussion re:  SHOULD on RFC 3396?


>Thomas

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From dhcwg-admin@ietf.org  Fri Dec 20 13:29:45 2002
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To: Paul Duffy <paduffy@cisco.com>
cc: dhcwg@ietf.org
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt 
In-Reply-To: Message from Paul Duffy <paduffy@cisco.com> 
   of "Fri, 20 Dec 2002 12:47:08 EST." <4.3.2.7.2.20021220115411.02af9638@funnel.cisco.com> 
Date: Fri, 20 Dec 2002 13:28:04 -0500
From: Thomas Narten <narten@us.ibm.com>
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Oops, I didn't respond to the rest of your message. Sorry.

Paul Duffy <paduffy@cisco.com> writes:

> Hello Thomas,

> Please be aware that a rev 5 was sent to internet-drafts and to yourself 
> several weeks back...it still has not appeared in the DHC WG list.  It 
> looks like you're still looking at rev 4.  I will re-send the email.

> At 10:47 AM 12/20/2002 -0500, Thomas Narten wrote:
> >I was about to put this document back before the IESG formally, but I
> >notice that the IANA considerations section still talks about future
> >cablelabs suboptions being assigned via "expert review". I thought
> >there was agreement to make this "IETF Consensus". I.e., see:
> >
> >http://www1.ietf.org/mail-archive/working-groups/dhcwg/current/msg01416.html
> >
> >I haven't checked the other edits carefully. Is this document *really*
> >ready for advancement, or did some other things get left out?

> This is not my understanding.  My understanding is that early on, with 
> Ralph's guidance, we had general consensus for the text as it stands.  Some 
> months later a couple questions were raised (noted above).

Saying there was a consensus in the past, and then *not* responding to
the issue when it is raised again saying why you don't want to make
change is not consistent with the way the IETF works. In the thread I
referenced, there was discussion about how to maybe deal with the
concerns Cablelabs had.

Ave you had a chance to look at
draft-narten-iana-experimental-allocations-02.txt?  Does this address
any of your concerns? (Or do I still not really understand the
concerns behind this?)

> Cablelabs intends to place any new sub-option additions before IETF for 
> approval (witness the recent submission of sub-option 51), but we STRONGLY 
> would prefer to be allowed to assign the sub-option codes.  It will make 
> life a bit easier for the component manufacturers, compliance
> testing, etc.

In other words, you want the option number for implementations before
the ID has been reviewed and finallized by the community.  Isn't this
what led to the situation with the current document having sat around
for two years before it became urgent to finalize it (and then oops,
we've already done it this way, now it's painful to change...). I'll
note that the -00 version of this ID appeared in March of 2000.

We really need to avoid these types of problems in the future. (And
this is a bit of a plea to the WG in general: can we please just
finish some of the work that is going on in this WG? Things take a
long time becaue folks don't push for closure.)

The right way is:

1) propose the option
2) get it reviewed in DHC
3) ship the document to the IESG for approval
4) get a code point assigned.

None of the above needs to take years (even if we have examples to the
contrary).  But if people think a particular document/option is
important, then they need to drive it to closure in a timely
fashion. I am not a fan of early assignment of code points because I
have seen the problems this can lead to, and it futher reduces what
little incentive there already seems to be to actually finish a
document.

> >In this case, if the CCC option exceeds 255, under what conditions
> >should the SHOULD be ignored? I can't think if any right off.

> The SHOULD resulted from discussions with the device manufacturers.  The 
> intent of the SHOULD was to accommodate devices that existed long before 
> this RFC.  By making this a MUST, these devices will be 
> non-compliant.  PacketCable has been in the works for several years...early 
> field trials are starting.

It is not generally a goal of IETF IDs/RFCs to grandfather earlier
implementations. Doing so effectively prevents a document from
specifying the correct behavior. Surely you see the problems here.

Besides, how can a two year old implementation be compliant with the
*current* version of this ID? It seems like we've made a number of
signficant changes to it....

> Helps ?  Please lets keep this discussion going.  With your help, I want to 
> close this draft/RFC up ASAP.

Agreed. Let's get closure and move on.

Thomas
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From dhcwg-admin@ietf.org  Fri Dec 20 14:39:55 2002
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Date: Fri, 20 Dec 2002 14:34:34 -0500
To: Thomas Narten <narten@us.ibm.com>
From: Paul Duffy <paduffy@cisco.com>
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt 
Cc: dhcwg@ietf.org
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Thomas,

CableLabs/IETF seem to be down to two issues.

1. The IANA considerations section.
2. MUST/SHOULD re: RFC 3396.

I'm going to have to discuss this with Cablelabs.  I'll try to get these 
questions answered ASAP, but given the holidays...I'll do what I can.

Cheers,

At 01:28 PM 12/20/2002 -0500, Thomas Narten wrote:
>Oops, I didn't respond to the rest of your message. Sorry.
>
>Paul Duffy <paduffy@cisco.com> writes:
>
> > Hello Thomas,
>
> > Please be aware that a rev 5 was sent to internet-drafts and to yourself
> > several weeks back...it still has not appeared in the DHC WG list.  It
> > looks like you're still looking at rev 4.  I will re-send the email.
>
> > At 10:47 AM 12/20/2002 -0500, Thomas Narten wrote:
> > >I was about to put this document back before the IESG formally, but I
> > >notice that the IANA considerations section still talks about future
> > >cablelabs suboptions being assigned via "expert review". I thought
> > >there was agreement to make this "IETF Consensus". I.e., see:
> > >
> > >http://www1.ietf.org/mail-archive/working-groups/dhcwg/current/msg01416 
> .html
> > >
> > >I haven't checked the other edits carefully. Is this document *really*
> > >ready for advancement, or did some other things get left out?
>
> > This is not my understanding.  My understanding is that early on, with
> > Ralph's guidance, we had general consensus for the text as it 
> stands.  Some
> > months later a couple questions were raised (noted above).
>
>Saying there was a consensus in the past, and then *not* responding to
>the issue when it is raised again saying why you don't want to make
>change is not consistent with the way the IETF works. In the thread I
>referenced, there was discussion about how to maybe deal with the
>concerns Cablelabs had.
>
>Ave you had a chance to look at
>draft-narten-iana-experimental-allocations-02.txt?  Does this address
>any of your concerns? (Or do I still not really understand the
>concerns behind this?)
>
> > Cablelabs intends to place any new sub-option additions before IETF for
> > approval (witness the recent submission of sub-option 51), but we STRONGLY
> > would prefer to be allowed to assign the sub-option codes.  It will make
> > life a bit easier for the component manufacturers, compliance
> > testing, etc.
>
>In other words, you want the option number for implementations before
>the ID has been reviewed and finallized by the community.  Isn't this
>what led to the situation with the current document having sat around
>for two years before it became urgent to finalize it (and then oops,
>we've already done it this way, now it's painful to change...). I'll
>note that the -00 version of this ID appeared in March of 2000.
>
>We really need to avoid these types of problems in the future. (And
>this is a bit of a plea to the WG in general: can we please just
>finish some of the work that is going on in this WG? Things take a
>long time becaue folks don't push for closure.)
>
>The right way is:
>
>1) propose the option
>2) get it reviewed in DHC
>3) ship the document to the IESG for approval
>4) get a code point assigned.
>
>None of the above needs to take years (even if we have examples to the
>contrary).  But if people think a particular document/option is
>important, then they need to drive it to closure in a timely
>fashion. I am not a fan of early assignment of code points because I
>have seen the problems this can lead to, and it futher reduces what
>little incentive there already seems to be to actually finish a
>document.
>
> > >In this case, if the CCC option exceeds 255, under what conditions
> > >should the SHOULD be ignored? I can't think if any right off.
>
> > The SHOULD resulted from discussions with the device manufacturers.  The
> > intent of the SHOULD was to accommodate devices that existed long before
> > this RFC.  By making this a MUST, these devices will be
> > non-compliant.  PacketCable has been in the works for several 
> years...early
> > field trials are starting.
>
>It is not generally a goal of IETF IDs/RFCs to grandfather earlier
>implementations. Doing so effectively prevents a document from
>specifying the correct behavior. Surely you see the problems here.
>
>Besides, how can a two year old implementation be compliant with the
>*current* version of this ID? It seems like we've made a number of
>signficant changes to it....
>
> > Helps ?  Please lets keep this discussion going.  With your help, I 
> want to
> > close this draft/RFC up ASAP.
>
>Agreed. Let's get closure and move on.
>
>Thomas
>_______________________________________________
>dhcwg mailing list
>dhcwg@ietf.org
>https://www1.ietf.org/mailman/listinfo/dhcwg

--

Paul Duffy
Cisco Systems, Inc.
paduffy@cisco.com


_______________________________________________
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From dhcwg-admin@ietf.org  Fri Dec 20 15:38:47 2002
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Date: Fri, 20 Dec 2002 15:39:42 -0500
To: Thomas Narten <narten@us.ibm.com>
From: Paul Duffy <paduffy@cisco.com>
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt 
Cc: dhcwg@ietf.org
In-Reply-To: <200212201828.gBKIS4o02210@rotala.raleigh.ibm.com>
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...inline....

>Ave you had a chance to look at
>draft-narten-iana-experimental-allocations-02.txt?  Does this address
>any of your concerns? (Or do I still not really understand the
>concerns behind this?)

Not sure this helps...


> > Cablelabs intends to place any new sub-option additions before IETF for
> > approval (witness the recent submission of sub-option 51), but we STRONGLY
> > would prefer to be allowed to assign the sub-option codes.  It will make
> > life a bit easier for the component manufacturers, compliance
> > testing, etc.
>
>In other words, you want the option number for implementations before
>the ID has been reviewed and finallized by the community.  Isn't this
>what led to the situation with the current document having sat around
>for two years before it became urgent to finalize it (and then oops,
>we've already done it this way, now it's painful to change...). I'll
>note that the -00 version of this ID appeared in March of 2000.

Is the intent here that IETF wants to insure the sub-option number DOES 
change (from experimental to official) when a CCC sub-option draft reaches 
RFC?  Forcing a change in the implementations?  If that is the case, then 
this discussion is over and Cablelabs will need to agree to your proposal.

Cheers,








--

Paul Duffy
Cisco Systems, Inc.
paduffy@cisco.com


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From dhcwg-admin@ietf.org  Fri Dec 20 18:42:10 2002
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From: "Woundy, Richard" <Richard_Woundy@cable.comcast.com>
To: "'Thomas Narten'" <narten@us.ibm.com>, "Paul Duffy" <paduffy@cisco.com>
cc: dhcwg@ietf.org
Subject: RE: [dhcwg] draft-ietf-dhc-packetcable-04.txt
Date: Fri, 20 Dec 2002 16:42:39 -0700
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Thomas,

>[Have] you had a chance to look at
>draft-narten-iana-experimental-allocations-02.txt?  Does this address
>any of your concerns? (Or do I still not really understand the
>concerns behind this?)

It seems that your draft's use of experimental numbers is pretty
restrictive. For example, it would allow Paul Duffy to conduct an experiment
in his all-Cisco lab, but it doesn't seem that CableLabs could conduct a
cross-vendor experiment even in their own lab (forget about any field
trials). Quite frankly, I think Paul could just as easily steal a DHCP
option code in the 128-254 space for such experimentation.

I draw this conclusion from the following paragraphs in your draft,
especially the second paragraph:

   An alternate approach, and the one recommended in this document, is
   to assign a range of numbers specifically earmarked for testing and
   experimentation purposes. Mutually consenting devices could use these
   numbers for whatever purposes they desire, but under the
   understanding that they are reserved for generic testing purposes,
   and other implementations may use the same numbers for different
   experimental uses...

   From the above, it follows that it would be inappropriate for a group
   of vendors, a consortia, or another Standards Development
   Organization to agree amongst themselves to use a particular value
   for a specific purpose. By definition, experimental numbers are not
   guaranteed to be unique in any environment other than one where the
   the local system administrator has chosen to use a particular number
   for a particular purpose and can ensure that a particular value is
   not already in use for some other purpose.

This comment from the draft could be especially tricky for a headless
PacketCable brick: "anyone making use of an experimental number should
require the user or customer to explicitly configure the value prior to
enabling its usage".

-- Rich

P.S. Side comment about the draft: is there a reason why there are two
different reference numbering schemes (RFC number versus descriptive name)
for the two references?

   [RFC2780] IANA Allocation Guidelines For Values In the Internet
           Protocol and Related Headers. S. Bradner, V. Paxson. March
           2000, RFC 2780.

   [IANA-CONSIDERATIONS] Guidelines for Writing an IANA Considerations
           Section in RFCs. T. Narten, H. Alvestrand. October 1998. RFC
           2434.

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From: "Woundy, Richard" <Richard_Woundy@cable.comcast.com>
To: "'Paul Duffy'" <paduffy@cisco.com>, "Thomas Narten" <narten@us.ibm.com>
cc: dhcwg@ietf.org
Subject: RE: [dhcwg] draft-ietf-dhc-packetcable-04.txt
Date: Fri, 20 Dec 2002 16:42:41 -0700
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Folks,

>Is the intent here that IETF wants to insure the sub-option number DOES 
>change (from experimental to official) when a CCC sub-option draft reaches 
>RFC?  Forcing a change in the implementations?  If that is the case, then 
>this discussion is over and Cablelabs will need to agree to your proposal.

I wish there was a way to balance IETF's needs to review new suboptions, and
CableLabs needs to define new suboptions in a timely fashion.

I appreciate the fact that the IETF process allowed the CCC option draft to
be cleaned up in many respects (e.g. removing unneeded port numbers, using
DHCP option concatenation).

At the same time, the IETF process has been relatively slow, compared to
CableLabs timelines. Obviously a major part of the problem has been the way
the draft was managed -- started in March 2000, suffered long time gaps
between drafts, and allowed to expire. But the draft has been fairly
actively managed since August 2002 by its two co-authors (one might disagree
with their positions, but they have tried to be responsive). If the IESG
were to approve the draft in January 2003 and the RFC editor were to publish
in March 2003 (being only a little optimistic), that's still seven months
since active management -- that's not including the original write-up time.
I wonder whether a new suboption could be realistically documented,
approved, and published using the standard IETF process within six months.

The comparison would be to the CableLabs Change Control process (e.g.
ECR/ECO/ECN), in which a change request is typically reviewed and approved
by vendors and operators in a 30-day window. The vendors are motivated to
review such changes in a timely fashion because it immediately impacts the
requirements on products that they produce. However, the CableLabs
vendor/operator community often does not have the same technical experience
as the IETF audience.

The ECx timeframe doesn't sound realistic in an IETF setting, and in fact
might be a non-goal.

One very messy way to balance between the polar extremes would be that
CableLabs throws new experimental suboptions into its non-IETF-endorsed
option 177, which suboptions might be ignored or redefined in IETF-endorsed
CCC option. But the result is that PacketCable devices and DHCP servers that
were serious about the cable market (because they worry about backward
compatibility with now-obsolete CableLabs suboptions) would need to
implement both option/suboption codes forever.

I think we would suffer the same results if some of the CCC suboption space
was dedicated to CableLabs-experimental use.

Can someone propose something better?

-- Rich

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From dhcwg-admin@ietf.org  Fri Dec 20 19:46:11 2002
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Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt
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I was under the impression that allocation for DHCP relay agent 
suboptions was not predicated on getting a draft through last call.   
The rules you're quoting are for mainline DHCP options, which are in 
short supply.   No such problem exists for relay agent suboptions.

I can't claim to speak for the WG, but if there is no conflict in the 
options that were allocated in the CableLabs draft, I don't see any 
reason why we'd want to change the numbers.

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From dhcwg-admin@ietf.org  Sat Dec 21 10:49:06 2002
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To: Paul Duffy <paduffy@cisco.com>
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Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt 
In-Reply-To: Message from Paul Duffy <paduffy@cisco.com> 
   of "Fri, 20 Dec 2002 15:39:42 EST." <4.3.2.7.2.20021220151206.02af5130@funnel.cisco.com> 
Date: Sat, 21 Dec 2002 10:47:53 -0500
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> Is the intent here that IETF wants to insure the sub-option number DOES 
> change (from experimental to official) when a CCC sub-option draft reaches 
> RFC?

The intent is that the option be reviewed by the community and
finalized *before* it becomes either a de facto standard, or one that
cablelabs has made a standard through its certification waves. Once it
is in effect a standard,

 - there is little incentive to finish the document
 - reasonable requests to change the option are rejected as "too late,
   it's already implemented"
 - the WG is stuck with a document they  may not like, but that they
   can't do anything about.

This is not the way we get good options defined.  What we need to
figure out how to do is get the IETF to review/bless the option
*before* it is needed by cablelabs.

> Forcing a change in the implementations?  If that is the case, then 
> this discussion is over and Cablelabs will need to agree to your proposal.

Note, the "change" we are talking about is potentially very
minor. Just use a different option number. If it is known in advance
that it will change, software can be designed to allow it to be
changed later.

My real concern with the above is the sense that "we can't change even
the option number", which to me means that if the IETF asks for
changes in the option, its too late  as well, since such changes would
be even *more* work to make. Right?

Thomas
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From dhcwg-admin@ietf.org  Sat Dec 21 10:51:02 2002
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Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt 
In-Reply-To: Message from "Woundy, Richard" <Richard_Woundy@cable.comcast.com> 
   of "Fri, 20 Dec 2002 16:42:39 MST." <6732623D2548D61193C90002A5C88DCC01EBD009@entmaexch02.broadband.att.com> 
Date: Sat, 21 Dec 2002 10:48:13 -0500
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> It seems that your draft's use of experimental numbers is pretty
> restrictive. For example, it would allow Paul Duffy to conduct an experiment
> in his all-Cisco lab, but it doesn't seem that CableLabs could conduct a
> cross-vendor experiment even in their own lab (forget about any field
> trials).

That is not the intent. The document is all about permitting
experiments. It is not, however, about encouraging general deployment,
under the guise of "experiment".

> Quite frankly, I think Paul could just as easily steal a DHCP option
> code in the 128-254 space for such experimentation.

And would that not be an acceptable solution? I *really* would like to
understand what the underlying requirement is here. I still feel like
perhaps I don't.

> I draw this conclusion from the following paragraphs in your draft,
> especially the second paragraph:

>    An alternate approach, and the one recommended in this document, is
>    to assign a range of numbers specifically earmarked for testing and
>    experimentation purposes. Mutually consenting devices could use these
>    numbers for whatever purposes they desire, but under the
>    understanding that they are reserved for generic testing purposes,
>    and other implementations may use the same numbers for different
>    experimental uses...

>    From the above, it follows that it would be inappropriate for a group
>    of vendors, a consortia, or another Standards Development
>    Organization to agree amongst themselves to use a particular value
>    for a specific purpose. By definition, experimental numbers are not
>    guaranteed to be unique in any environment other than one where the
>    the local system administrator has chosen to use a particular number
>    for a particular purpose and can ensure that a particular value is
>    not already in use for some other purpose.

I can see now the wording above could be better, if your conclusion is
that cablelabs can't even test.

Experimental use is for testing and experimentation.  But, it is not
for general deployment. In the latter, one runs the risk of having a
chosen number conflict with other usages, so one really needs a
dedicated number. So, part of what defines an experiment is what
environment it goes into, and whether the scope of the experiment can
ensure that use of a number won't conflict with a legitimate use of
that number for other authorized purposes (e.g, an official
assignment)

> This comment from the draft could be especially tricky for a headless
> PacketCable brick: "anyone making use of an experimental number should
> require the user or customer to explicitly configure the value prior to
> enabling its usage".

Experimental use numbers are not at all intended for mass deployments
or home users to configure their cable modems. If you are shipping
modems to home users, you are really not experimenting anymore; you
are deploying.

> P.S. Side comment about the draft: is there a reason why there are two
> different reference numbering schemes (RFC number versus descriptive name)
> for the two references?

None other than the author is not being  consistent and this hadn't
been pointed out until now... :-(

Thomas
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From dhcwg-admin@ietf.org  Sat Dec 21 10:55:40 2002
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To: "Woundy, Richard" <Richard_Woundy@cable.comcast.com>
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Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt 
In-Reply-To: Message from "Woundy, Richard" <Richard_Woundy@cable.comcast.com> 
   of "Fri, 20 Dec 2002 16:42:41 MST." <6732623D2548D61193C90002A5C88DCC01EBD00A@entmaexch02.broadband.att.com> 
Date: Sat, 21 Dec 2002 10:56:06 -0500
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> I wish there was a way to balance IETF's needs to review new
> suboptions, and CableLabs needs to define new suboptions in a timely
> fashion.

I agree. I am still under the assumption that this is achievable.

> I appreciate the fact that the IETF process allowed the CCC option
> draft to be cleaned up in many respects (e.g. removing unneeded port
> numbers, using DHCP option concatenation).

> At the same time, the IETF process has been relatively slow,
> compared to CableLabs timelines. Obviously a major part of the
> problem has been the way the draft was managed -- started in March
> 2000, suffered long time gaps between drafts, and allowed to
> expire. But the draft has been fairly actively managed since August
> 2002 by its two co-authors (one might disagree with their positions,
> but they have tried to be responsive). If the IESG were to approve
> the draft in January 2003 and the RFC editor were to publish in
> March 2003 (being only a little optimistic), that's still seven
> months since active management -- that's not including the original
> write-up time.  I wonder whether a new suboption could be
> realistically documented, approved, and published using the standard
> IETF process within six months.

I believe it can. IMO, part of the issue here with cablelabs options
in particular is a startup issue. We only in August really seriously
looked at this document. A number of substantive (and general) issues
were raised and have been mostly resolved. (Note also, some of these
issues come from bad experiences that have been had in the IPCDN WG,
where cablelabs is the main player. I do not believe we can ignore
those experiences and just do as has been done in the past, without
risking that we are setting ourselves up for failure.)  I expect we
both have a much better understanding of the needs of the other body,
and are in a much better position to move quickly on future documents.

Note also, I don't think the delay between IESG approval and RFC
publication is a real issue. (If it is we should chat more.) I've been
led to understand is that the issue is IESG approval of the document,
and IANA assignment of the code points. IANA assigns the code point
more-or-less immediately after IESG approval of a document (this can
be expedited if it is known to be critical). So the key issue is IESG
approval of the document.  BTW, despite my grumbling in earlier
posting, I did go ahead and put the document in the next IESG telechat
(scheduled for next week) so we can hopefully work out the last issues
and get IESG review in parallel. So I think we are still quite capable
of getting the document approved in January.

> The comparison would be to the CableLabs Change Control process
> (e.g.  ECR/ECO/ECN), in which a change request is typically reviewed
> and approved by vendors and operators in a 30-day window. The
> vendors are motivated to review such changes in a timely fashion
> because it immediately impacts the requirements on products that
> they produce. However, the CableLabs vendor/operator community often
> does not have the same technical experience as the IETF audience.

Are you really saying that the time from initial proposal until the
time the spec is finalized is 30 days? I have a hard time believing
that. What exactly is "change request" above, and what sorts of
changes are allowed? It is one thing to make minor changes, like
fixes. It is probably something very different to add something
completely new.

> The ECx timeframe doesn't sound realistic in an IETF setting, and in
> fact might be a non-goal.

It is critical that the timeline requirements of cablelabs be exported
to the IETF and that the IETF understand what they are. One problem
has been that there has been (and still continues to be) confusion
about what the real deadlines are. *If* we had firm timelines to look
at, we could make a realistic assessment of whether the IETF can do
its part within that time frame. We (the WG) can then commit to
meeting those needs. This is quite possible, so long as we have a
clear understanding of the timelines and we *both* agree to execute on
a *realistic* plan.

> One very messy way to balance between the polar extremes would be that
> CableLabs throws new experimental suboptions into its non-IETF-endorsed
> option 177, which suboptions might be ignored or redefined in IETF-endorsed
> CCC option. But the result is that PacketCable devices and DHCP servers that
> were serious about the cable market (because they worry about backward
> compatibility with now-obsolete CableLabs suboptions) would need to
> implement both option/suboption codes forever.

> I think we would suffer the same results if some of the CCC suboption space
> was dedicated to CableLabs-experimental use.

Key point: it is the notion that cablelabs takes a pre-finalized
version of an option and effectively makes it a standard that is
unchangable in practice that is the root problem (this *exact* issue
has been a repeating problem in the IPCDN WG). Once you ship
something, it becomes *much* harder to modify the option. People say
"its not worth it". "We can't change what is already deployed". It is
*this* *issue* we need to avoid. We need to get options finalized and
through the process prior to them become de facto standards on the
cablelabs side. If we can't do that, we might as well just give up.

Thomas
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From dhcwg-admin@ietf.org  Mon Dec 23 10:20:38 2002
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To: Thomas Narten <narten@us.ibm.com>
From: Ralph Droms <rdroms@cisco.com>
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt 
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As a way of getting more timely coordination between CableLabs and the 
IETF, would it be possible to involve the IETF earlier in the process of 
developing an option?  That is, as soon as CableLabs identifies the need 
for a new sub-option, publish an Internet-Draft describing that sub-option 
and bring it to the IETF/DHCWG.  Development can take place in parallel - 
Internet-Drafts are cheap - so that the WG has a chance to review the new 
option and can be prepared to bring it to last call as soon as the 
CableLabs change control process has the new specs in place.

- Ralph

At 10:56 AM 12/21/2002 -0500, Thomas Narten wrote:
> > I wish there was a way to balance IETF's needs to review new
> > suboptions, and CableLabs needs to define new suboptions in a timely
> > fashion.
>
>I agree. I am still under the assumption that this is achievable.




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From dhcwg-admin@ietf.org  Mon Dec 23 10:44:12 2002
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From: "Woundy, Richard" <Richard_Woundy@cable.comcast.com>
To: "'Ted Lemon'" <Ted.Lemon@nominum.com>
cc: dhcwg@ietf.org, "Paul Duffy" <paduffy@cisco.com>,
        "'Thomas Narten'" <narten@us.ibm.com>
Subject: RE: [dhcwg] draft-ietf-dhc-packetcable-04.txt
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Ted,

I thought we were talking about the CCC sub-option numbering space, not the
relay information option sub-option numbering space.

I'm not even sure that I am advocating that CableLabs "own" the suboption
space...

-- Rich

-----Original Message-----
From: Ted Lemon [mailto:Ted.Lemon@nominum.com]
Sent: Friday, December 20, 2002 7:47 PM
To: Woundy, Richard
Cc: dhcwg@ietf.org; Paul Duffy; 'Thomas Narten'
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt


I was under the impression that allocation for DHCP relay agent 
suboptions was not predicated on getting a draft through last call.   
The rules you're quoting are for mainline DHCP options, which are in 
short supply.   No such problem exists for relay agent suboptions.

I can't claim to speak for the WG, but if there is no conflict in the 
options that were allocated in the CableLabs draft, I don't see any 
reason why we'd want to change the numbers.

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From dhcwg-admin@ietf.org  Mon Dec 23 11:41:27 2002
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Thomas,

These comments are really about your draft
<http://www.ietf.org/internet-drafts/draft-narten-iana-experimental-allocati
ons-03.txt>.

I thought you were advocating the allocation of a few CCC sub-options for
experimentation, not the use of the standard DHCP experimental option space
-- which explains this exchange of comments between us:

>> Quite frankly, I think Paul could just as easily steal a DHCP option
>> code in the 128-254 space for such experimentation.
>
> And would that not be an acceptable solution? I *really* would like to
> understand what the underlying requirement is here. I still feel like
> perhaps I don't.

So the advice from your draft is to use DHCP experimental options 128-254,
and not set aside space for experimental CCC suboptions, right?

Now let me consider this exchange:

>> This comment from the draft could be especially tricky for a headless
>> PacketCable brick: "anyone making use of an experimental number should
>> require the user or customer to explicitly configure the value prior to
>> enabling its usage".
>
>Experimental use numbers are not at all intended for mass deployments
>or home users to configure their cable modems. If you are shipping
>modems to home users, you are really not experimenting anymore; you
>are deploying.

I don't think you're seeing my real point about headless devices and DHCP
option experimentation. Let's disregard cable for this discussion. How does
one "explicitly configure the value" on a device without a user interface
(i.e. a brick)? Perhaps some devices will obtain an IPv4 link-local address
for its testing-accessible interface, and then the device can be configured
using an internal web server or SNMP agent -- but that's the ideal (I
think). It is perhaps more likely that the only way that the device will
know about any DHCP experimental options is if the device has downloaded
firmware that understands the option(s). Shouldn't the draft consider this
possibility?

There's something else that I don't understand: why do you use the term
"customers" in your draft? Apparently according to your comments, this term
does not apply to broadband Internet customers (cable or otherwise). Then
what kinds of customers are "safe"? Why would any "customer" be willing to
stop such an experiment, if the experiment helped them resolve some problem
or added a feature?

-- Rich

-----Original Message-----
From: Thomas Narten [mailto:narten@us.ibm.com]
Sent: Saturday, December 21, 2002 10:48 AM
To: Woundy, Richard
Cc: Paul Duffy; dhcwg@ietf.org
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt


> It seems that your draft's use of experimental numbers is pretty
> restrictive. For example, it would allow Paul Duffy to conduct an
experiment
> in his all-Cisco lab, but it doesn't seem that CableLabs could conduct a
> cross-vendor experiment even in their own lab (forget about any field
> trials).

That is not the intent. The document is all about permitting
experiments. It is not, however, about encouraging general deployment,
under the guise of "experiment".

> Quite frankly, I think Paul could just as easily steal a DHCP option
> code in the 128-254 space for such experimentation.

And would that not be an acceptable solution? I *really* would like to
understand what the underlying requirement is here. I still feel like
perhaps I don't.

> I draw this conclusion from the following paragraphs in your draft,
> especially the second paragraph:

>    An alternate approach, and the one recommended in this document, is
>    to assign a range of numbers specifically earmarked for testing and
>    experimentation purposes. Mutually consenting devices could use these
>    numbers for whatever purposes they desire, but under the
>    understanding that they are reserved for generic testing purposes,
>    and other implementations may use the same numbers for different
>    experimental uses...

>    From the above, it follows that it would be inappropriate for a group
>    of vendors, a consortia, or another Standards Development
>    Organization to agree amongst themselves to use a particular value
>    for a specific purpose. By definition, experimental numbers are not
>    guaranteed to be unique in any environment other than one where the
>    the local system administrator has chosen to use a particular number
>    for a particular purpose and can ensure that a particular value is
>    not already in use for some other purpose.

I can see now the wording above could be better, if your conclusion is
that cablelabs can't even test.

Experimental use is for testing and experimentation.  But, it is not
for general deployment. In the latter, one runs the risk of having a
chosen number conflict with other usages, so one really needs a
dedicated number. So, part of what defines an experiment is what
environment it goes into, and whether the scope of the experiment can
ensure that use of a number won't conflict with a legitimate use of
that number for other authorized purposes (e.g, an official
assignment)

> This comment from the draft could be especially tricky for a headless
> PacketCable brick: "anyone making use of an experimental number should
> require the user or customer to explicitly configure the value prior to
> enabling its usage".

Experimental use numbers are not at all intended for mass deployments
or home users to configure their cable modems. If you are shipping
modems to home users, you are really not experimenting anymore; you
are deploying.

> P.S. Side comment about the draft: is there a reason why there are two
> different reference numbering schemes (RFC number versus descriptive name)
> for the two references?

None other than the author is not being  consistent and this hadn't
been pointed out until now... :-(

Thomas

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From dhcwg-admin@ietf.org  Mon Dec 23 12:41:18 2002
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From: "Woundy, Richard" <Richard_Woundy@cable.comcast.com>
To: "'Ralph Droms'" <rdroms@cisco.com>, "Thomas Narten" <narten@us.ibm.com>
cc: "'Paul Duffy'" <paduffy@cisco.com>, dhcwg@ietf.org
Subject: RE: [dhcwg] draft-ietf-dhc-packetcable-04.txt
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OK, let's see how such coordination works with a real example:
<http://www.ietf.org/internet-drafts/draft-ietf-dhc-suboptions-kdc-serveradd
ress-02.txt>.

This draft defines a single new CCC sub-option for use in so-called
"CableHome" devices. It was separated from the CCC option draft due to the
timing of the CCC WG last-call, etc.

This draft isn't perfect -- e.g. its IANA considerations section is awaiting
what happens to the CCC option draft -- but it is pretty close to what
CableLabs would be expecting. There has been no complaints about the review
schedule of this draft so far, because cable folks realize that the CCC
option draft needs to be approved first.

If the CCC draft were to be approved in January, how long would it take to
get this new draft approved?

-- Rich

-----Original Message-----
From: Ralph Droms [mailto:rdroms@cisco.com]
Sent: Monday, December 23, 2002 10:21 AM
To: Thomas Narten
Cc: Woundy, Richard; 'Paul Duffy'; dhcwg@ietf.org
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt


As a way of getting more timely coordination between CableLabs and the 
IETF, would it be possible to involve the IETF earlier in the process of 
developing an option?  That is, as soon as CableLabs identifies the need 
for a new sub-option, publish an Internet-Draft describing that sub-option 
and bring it to the IETF/DHCWG.  Development can take place in parallel - 
Internet-Drafts are cheap - so that the WG has a chance to review the new 
option and can be prepared to bring it to last call as soon as the 
CableLabs change control process has the new specs in place.

- Ralph

At 10:56 AM 12/21/2002 -0500, Thomas Narten wrote:
> > I wish there was a way to balance IETF's needs to review new
> > suboptions, and CableLabs needs to define new suboptions in a timely
> > fashion.
>
>I agree. I am still under the assumption that this is achievable.




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From dhcwg-admin@ietf.org  Mon Dec 23 13:57:34 2002
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Thomas,

(Reminder: this discussion is about defining future CCC sub-options, e.g.
about the IANA Considerations for draft-ietf-dhc-packetcable-05.txt)

The 30-day clock on the CableLabs change control process can be reset for
major changes, so everything at CableLabs does not have to be decided in 30
days.

It would not have been realistic for all the changes embodied in
draft-ietf-dhc-packetcable-04.txt to be approved in one CableLabs 30-day
review cycle, which is why I stated:

> The ECx timeframe doesn't sound realistic in an IETF setting, and in
> fact might be a non-goal.

It might be more realistic for the (theoretical) definition of an additional
CCC sub-option to be approved by CableLabs in 30 days -- especially if the
sub-option were an obvious solution, a "no-brainer" if you will. That was
the real concern from my email.

But let's talk about the real CableLabs milestones, which revolve around
product certification waves. Here are two sources for such information:

<http://www.cablemodem.com/downloads/2003_Certification_Schedule.pdf>

<http://www.ipcdn.org/milestones.html> -- please focus on the Certification
Wave dates here

Note that the ECR (Engineering Change Request) cut-off date from the second
link above is 30 days before the ECN (Engineering Change Notice) acceptance
date from the first link above. This is the effect of the CableLabs change
control process 30-day clock. The ECR is written at the beginning of the
change control process, and the ECN is the output of the change control
process.

Once a cable-related internet-draft is IESG-approved and has IANA-assigned
numbers (e.g. option and sub-option codes), then someone in the CableLabs
community writes and submits an appropriate ECR, which would presumably be
approved and issued as an ECN 30 days later.

The base CableLabs specifications plus the ECNs form the requirements for
CableLabs product certification. CableLabs will not certify equipment in a
particular wave, unless it meets the requirements from the ECNs that apply
to that wave. That's how cable vendors are motivated to implement
requirements in their products -- and also why they are motivated to review
ECRs within the 30-day window.

As you can see from the CableLabs milestones, if a particular ECR/ECN
deadline is missed, we suffer a 4-5 month delay on product implementation
and deployment. That's why CableLabs would be concerned about timeliness in
specification approvals.

Hope this helps in our mutual understanding of approval processes.

-- Rich

-----Original Message-----
From: Thomas Narten [mailto:narten@us.ibm.com]
Sent: Saturday, December 21, 2002 10:56 AM
To: Woundy, Richard
Cc: 'Paul Duffy'; dhcwg@ietf.org
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt

[snip]

> The comparison would be to the CableLabs Change Control process
> (e.g.  ECR/ECO/ECN), in which a change request is typically reviewed
> and approved by vendors and operators in a 30-day window. The
> vendors are motivated to review such changes in a timely fashion
> because it immediately impacts the requirements on products that
> they produce. However, the CableLabs vendor/operator community often
> does not have the same technical experience as the IETF audience.

Are you really saying that the time from initial proposal until the
time the spec is finalized is 30 days? I have a hard time believing
that. What exactly is "change request" above, and what sorts of
changes are allowed? It is one thing to make minor changes, like
fixes. It is probably something very different to add something
completely new.

> The ECx timeframe doesn't sound realistic in an IETF setting, and in
> fact might be a non-goal.

It is critical that the timeline requirements of cablelabs be exported
to the IETF and that the IETF understand what they are. One problem
has been that there has been (and still continues to be) confusion
about what the real deadlines are. *If* we had firm timelines to look
at, we could make a realistic assessment of whether the IETF can do
its part within that time frame. We (the WG) can then commit to
meeting those needs. This is quite possible, so long as we have a
clear understanding of the timelines and we *both* agree to execute on
a *realistic* plan.

[snip]

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From dhcwg-admin@ietf.org  Mon Dec 23 15:15:29 2002
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> I thought we were talking about the CCC sub-option numbering space, 
> not the
> relay information option sub-option numbering space.

D'oh, sorry.   The point is still the same - we do not need as 
draconian a standard as we have for DHCP options.   WG consensus that 
the suboption is okay should be enough to allow assignment of a code - 
that is, we don't have to agree on the exact final wording of the RFC 
before you get a code.

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From dhcwg-admin@ietf.org  Mon Dec 23 16:25:28 2002
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Thomas,

I think I agree with the main points of your email below. 

First, I agree that it is unreasonable for CableLabs to define a new
option/sub-option, to choose a option/sub-option code, to mandate
implementation of that option/sub-option in certified products -- and then
later to take that specification and to expect to have it rubber-stamped by
an IETF working group. That is a waste of time for everyone involved.

Second, I agree that the correct direction is for CableLabs to submit drafts
for IETF critical review and blessing -- before it is required in certified
products. This direction may be sometimes painful culturally for the
CableLabs community, but the "pain" should enable the industry to specify
new features in a better long-term way (e.g. not having to re-specify the
same features).

I think our point of divergence is about maintaining some flexibility for
CableLabs. Let's suppose, hypothetically, that someone discovers that the
cable industry need an additional CCC suboption right now, and writes and
submits a new draft today. Also consider the current CableLabs calendar,
<http://www.cablemodem.com/downloads/2003_Certification_Schedule.pdf>.

If the new draft isn't approved by IANA before February 12th (which I
believe is incredibly aggressive), then CableLabs would not certify any
products in compliance with the new draft before November 17th, which would
imply no significant cable deployments until 2004.

If the draft represents a nice-to-have feature, then this delay might be
acceptable. If the draft represents an emergency item that would otherwise
prevent VoIP over cable deployments in 2003, then the delay would be
crushing.

For an emergency extension, I can imagine these two possible responses:
- CableLabs and the IETF/IESG would work on this draft in "emergency mode"
to make a very aggressive date. That seems to be pushing to the limits on an
all-volunteer organization such as the IETF. It also begs the question about
whether CableLabs and the IETF would agree about what constitutes an
"emergency".
- CableLabs could define its own interim extension, perhaps with some help
from the IETF. The IETF/IESG would approve the draft on its own timetable,
on its own terms (e.g. likely changing syntax and option codes). CableLabs
vendors in the future would have to support both the CableLabs extension
(backward compatibility) and the IETF draft/RFC extension for product
certification -- until the CableLabs extension is phased out.

Note that the CableLabs vendor implementation penalty for not working
through the IETF process would be to implement two similar mechanisms (e.g.
two sub-options) for the same extension. That would provide incentive to
work as early as possible through the IETF as part of the normal
specification process.

I hope you see where I am going with this...

-- Rich

-----Original Message-----
From: Thomas Narten [mailto:narten@us.ibm.com]
Sent: Saturday, December 21, 2002 10:48 AM
To: Paul Duffy
Cc: dhcwg@ietf.org
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-04.txt


> Is the intent here that IETF wants to insure the sub-option number DOES 
> change (from experimental to official) when a CCC sub-option draft reaches

> RFC?

The intent is that the option be reviewed by the community and
finalized *before* it becomes either a de facto standard, or one that
cablelabs has made a standard through its certification waves. Once it
is in effect a standard,

 - there is little incentive to finish the document
 - reasonable requests to change the option are rejected as "too late,
   it's already implemented"
 - the WG is stuck with a document they  may not like, but that they
   can't do anything about.

This is not the way we get good options defined.  What we need to
figure out how to do is get the IETF to review/bless the option
*before* it is needed by cablelabs.

> Forcing a change in the implementations?  If that is the case, then 
> this discussion is over and Cablelabs will need to agree to your proposal.

Note, the "change" we are talking about is potentially very
minor. Just use a different option number. If it is known in advance
that it will change, software can be designed to allow it to be
changed later.

My real concern with the above is the sense that "we can't change even
the option number", which to me means that if the IETF asks for
changes in the option, its too late  as well, since such changes would
be even *more* work to make. Right?

Thomas
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From dhcwg-admin@ietf.org  Fri Dec 27 18:12:01 2002
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We should clearly separate (1) the technical comments on the present
Internet-draft from (2) the policy question on how IETF would like DHCP
options and sub-options to be temporarily assigned for testing.

(1) MUST/SHOULD re: RFC 3396.
This is related to the CCC and present sub-options. We will get closure
on this asap. Personally, I'm ok with changing the current draft to
mandate a MUST on 3396.

(2) policy question:
For now, we have a short term need to get the CCC option approved and
passed IESG so that we can update our spec and vendors can start
building to it. This is time critical here to implement the IETF RFC by
certification wave 26.
Couldn't the policy discussion should be eliminated from this draft for
now by stating the conclusion of the Oct 15 thread, that is: 
IANA is requested to register codes for future CableLabs Client
Configuration sub-options with an "IETF consensus" approval policy as
described in RFC 2434 [2]. Future proposed sub-options will submitted to
IETF for review.
--> This means: IETF consensus is required and IANA assigns the value.

I think the rest of the discussion belongs to
draft-narten-iana-experimental-allocations-03.txt. It should not be
specific to CableLabs. As long as we address in a future document how we
can get some experimental codes to define the functionality and test it
while the IETF review process takes place, I think we are ok. 
Thomas did address some of the concerns I raised on Oct 15 in
draft-narten-iana-experimental-allocations-03.txt and Rich made some
good points.

Jean-Francois.
/----------------------
Jean-Francois Mule
CableLabs, PacketCable
jfm@cablelabs.com
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From dhcwg-admin@ietf.org  Fri Dec 27 18:12:05 2002
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So that this thread does not read like a risk game between CableLabs vs.
IETF, note that: 
  (a) references of CableLabs in this thread are sometimes "abusive". It
is the intent of CableLabs to work with IETF and rely on IETF for DHCP
option/sub-option assignments and review.
  (b)The CableLabs PacketCable provisioning spec has been clear for
quite some time now on this DHCP option code: 
PKT-SP-PROV-I05-021127 publicly posted states 
In section 8: "The CM and MTA requirements for DHCP Option Codes 177
[...] are detailed in section 8.1 [...]. These DHCP options are
currently defined in a draft proposal submitted to the Internet
Engineering Task Force (IETF) DHCP committee [13]."
In section 8.1: "DHCP option code 177 is a temporary code that the
PacketCable embedded-MTA device can use until a permanent code is
assigned by the IETF."

Jean-Francois.
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From dhcwg-admin@ietf.org  Mon Dec 30 18:14:35 2002
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Thomas/everyone,

Regarding the two remaining issues with this draft...

1. MUST/SHOULD re: RFC 3396.  There appears to be initial agreement within 
the Cablelabs community to change this to a MUST. I propose the following 
text change (top of page 4).

Old text...

"When the total length of a CCC option exceeds 255 octets, the procedure 
outlined in [4] SHOULD be employed to split the option into multiple, 
smaller options."

New text...

"When the total length of a CCC option exceeds 255 octets, the procedure 
outlined in [4] MUST be employed to split the option into multiple, smaller 
options."


2. Section 12 "Procedure for Adding Additional Sub-options".  The Cablelabs 
community desires input into the sub-option code assignments for a couple 
of reasons.  a) the need to get sub-option codes assigned as quickly as the 
IETF process will allow and b) Cablelabs wishes to partition the sub-option 
code space amongst various CableLabs projects.  For example: sub-options 1 
to 50 will  be assigned to the PacketCable project, sub-options 51 - 100 
assigned to the CableHome project, etc.

With these points in mind, I'd like to propose the following text changes 
to section 12.

Old text...

"IANA is requested to register codes for future CableLabs Client 
Configuration Sub-options with an "Expert Review" approval policy as 
described in RFC 2434 [2]. Future proposed sub-options will be assigned a 
numeric code chosen by CableLabs, which will be documented in the Internet 
Drafts that describe the sub-options. The code assignment will be reviewed 
by a designated expert from the IETF prior to publication in an RFC."

New text...

"IANA is requested to register codes for future CableLabs Client 
Configuration Sub-options with an "Expert Review" approval policy as 
described in RFC 2434 [2]. Future proposed sub-options will be assigned a 
numeric code chosen by CableLabs immediately following IESG approval of the 
draft.  This code assignment will then be reviewed by an IETF designated 
expert."

The intent of the this text change is to allow Cablelabs to choose the 
sub-option code assignment, but not until the sub-option draft has cleared 
IESG approval and the designated expert's review.

Thoughts?


--

Paul Duffy
Cisco Systems, Inc.
paduffy@cisco.com


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From dhcwg-admin@ietf.org  Mon Dec 30 18:45:18 2002
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> Future proposed sub-options will be assigned a numeric code chosen by 
> CableLabs immediately following IESG approval of the draft.

What does "IETF approval of the draft" mean?   If it means that the 
draft has been adopted by the WG, sounds fine, but if it means that the 
draft has passed the IESG review, then what's the point of the expert 
review?

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From dhcwg-admin@ietf.org  Mon Dec 30 23:26:29 2002
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At 06:45 PM 12/30/2002 -0500, Ted Lemon wrote:
>>Future proposed sub-options will be assigned a numeric code chosen by 
>>CableLabs immediately following IESG approval of the draft.
>
>What does "IETF approval of the draft" mean?   If it means that the draft 
>has been adopted by the WG, sounds fine, but if it means that the draft 
>has passed the IESG review, then what's the point of the expert review?
>

Hi Ted,

The point I am trying to get across is that the DHC WG, ADs, IESG, etc. 
approve the technical content/semantics of the sub-option, then Cablelabs 
would assign the sub-option code.  I'm trying to balance CableLab's need 
for speed with IETF's review of the content of the sub-option.  The expert 
review would be only for the choice of sub-option code assignment(?), not 
the actual technical content of the draft.

So the order of events would be:

1. CCC sub-option draft submitted to DHC WG.
2. DHC WG, AD, IESG review/approve sub-option format and content.
3. Cablelabs assigns sub-option code.
4. IETF expert reviewer approves code assignment.
5a. Cablelabs compliant vendors start implementing sub-option for testing 
and shipment to customer.
5b. Draft is simultaneously submitted to RFC editor Q.

If all goes well, field shipments can commence just about the time the RFC 
exits the editor Q.

I'm grasping for a compromise here.  Any suggestions?

Cheers,





--

Paul Duffy
Cisco Systems, Inc.
paduffy@cisco.com


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From dhcwg-admin@ietf.org  Tue Dec 31 08:37:26 2002
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Message-ID: <A1DDC8E21094D511821C00805F6F706B05552B70@eamrcnt715.exu.ericsson.se>
From: "Bernie Volz (EUD)" <Bernie.Volz@am1.ericsson.se>
To: "'Paul Duffy'" <paduffy@cisco.com>, Ted Lemon <Ted.Lemon@nominum.com>
Cc: Ralph Droms <rdroms@cisco.com>, Thomas Narten <narten@us.ibm.com>,
        dhcwg@ietf.org
Subject: RE: [dhcwg] draft-ietf-dhc-packetcable-05.txt
Date: Tue, 31 Dec 2002 07:36:00 -0600
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I think what this means is that instead of having IANA assign and register, IANA would only
register. So, when the draft enters the RFC-Editor queue, IANA is contacted as it normally
is and IANA would contact CableLabs which would assign the suboption. IANA then registers it.

Is that correct? Seems OK by me if IANA is willing.

This means CableLabs can start using the suboption as soon as the draft enters the RFC-Editor
queue instead of having to await actual publication of the RFC.

- Bernie

-----Original Message-----
From: Paul Duffy [mailto:paduffy@cisco.com]
Sent: Monday, December 30, 2002 11:27 PM
To: Ted Lemon
Cc: Ralph Droms; Thomas Narten; dhcwg@ietf.org
Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-05.txt


At 06:45 PM 12/30/2002 -0500, Ted Lemon wrote:
>>Future proposed sub-options will be assigned a numeric code chosen by 
>>CableLabs immediately following IESG approval of the draft.
>
>What does "IETF approval of the draft" mean?   If it means that the draft 
>has been adopted by the WG, sounds fine, but if it means that the draft 
>has passed the IESG review, then what's the point of the expert review?
>

Hi Ted,

The point I am trying to get across is that the DHC WG, ADs, IESG, etc. 
approve the technical content/semantics of the sub-option, then Cablelabs 
would assign the sub-option code.  I'm trying to balance CableLab's need 
for speed with IETF's review of the content of the sub-option.  The expert 
review would be only for the choice of sub-option code assignment(?), not 
the actual technical content of the draft.

So the order of events would be:

1. CCC sub-option draft submitted to DHC WG.
2. DHC WG, AD, IESG review/approve sub-option format and content.
3. Cablelabs assigns sub-option code.
4. IETF expert reviewer approves code assignment.
5a. Cablelabs compliant vendors start implementing sub-option for testing 
and shipment to customer.
5b. Draft is simultaneously submitted to RFC editor Q.

If all goes well, field shipments can commence just about the time the RFC 
exits the editor Q.

I'm grasping for a compromise here.  Any suggestions?

Cheers,





--

Paul Duffy
Cisco Systems, Inc.
paduffy@cisco.com


_______________________________________________
dhcwg mailing list
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<P><FONT SIZE=2>I think what this means is that instead of having IANA assign and register, IANA would only</FONT>
<BR><FONT SIZE=2>register. So, when the draft enters the RFC-Editor queue, IANA is contacted as it normally</FONT>
<BR><FONT SIZE=2>is and IANA would contact CableLabs which would assign the suboption. IANA then registers it.</FONT>
</P>

<P><FONT SIZE=2>Is that correct? Seems OK by me if IANA is willing.</FONT>
</P>

<P><FONT SIZE=2>This means CableLabs can start using the suboption as soon as the draft enters the RFC-Editor</FONT>
<BR><FONT SIZE=2>queue instead of having to await actual publication of the RFC.</FONT>
</P>

<P><FONT SIZE=2>- Bernie</FONT>
</P>

<P><FONT SIZE=2>-----Original Message-----</FONT>
<BR><FONT SIZE=2>From: Paul Duffy [<A HREF="mailto:paduffy@cisco.com">mailto:paduffy@cisco.com</A>]</FONT>
<BR><FONT SIZE=2>Sent: Monday, December 30, 2002 11:27 PM</FONT>
<BR><FONT SIZE=2>To: Ted Lemon</FONT>
<BR><FONT SIZE=2>Cc: Ralph Droms; Thomas Narten; dhcwg@ietf.org</FONT>
<BR><FONT SIZE=2>Subject: Re: [dhcwg] draft-ietf-dhc-packetcable-05.txt</FONT>
</P>
<BR>

<P><FONT SIZE=2>At 06:45 PM 12/30/2002 -0500, Ted Lemon wrote:</FONT>
<BR><FONT SIZE=2>&gt;&gt;Future proposed sub-options will be assigned a numeric code chosen by </FONT>
<BR><FONT SIZE=2>&gt;&gt;CableLabs immediately following IESG approval of the draft.</FONT>
<BR><FONT SIZE=2>&gt;</FONT>
<BR><FONT SIZE=2>&gt;What does &quot;IETF approval of the draft&quot; mean?&nbsp;&nbsp; If it means that the draft </FONT>
<BR><FONT SIZE=2>&gt;has been adopted by the WG, sounds fine, but if it means that the draft </FONT>
<BR><FONT SIZE=2>&gt;has passed the IESG review, then what's the point of the expert review?</FONT>
<BR><FONT SIZE=2>&gt;</FONT>
</P>

<P><FONT SIZE=2>Hi Ted,</FONT>
</P>

<P><FONT SIZE=2>The point I am trying to get across is that the DHC WG, ADs, IESG, etc. </FONT>
<BR><FONT SIZE=2>approve the technical content/semantics of the sub-option, then Cablelabs </FONT>
<BR><FONT SIZE=2>would assign the sub-option code.&nbsp; I'm trying to balance CableLab's need </FONT>
<BR><FONT SIZE=2>for speed with IETF's review of the content of the sub-option.&nbsp; The expert </FONT>
<BR><FONT SIZE=2>review would be only for the choice of sub-option code assignment(?), not </FONT>
<BR><FONT SIZE=2>the actual technical content of the draft.</FONT>
</P>

<P><FONT SIZE=2>So the order of events would be:</FONT>
</P>

<P><FONT SIZE=2>1. CCC sub-option draft submitted to DHC WG.</FONT>
<BR><FONT SIZE=2>2. DHC WG, AD, IESG review/approve sub-option format and content.</FONT>
<BR><FONT SIZE=2>3. Cablelabs assigns sub-option code.</FONT>
<BR><FONT SIZE=2>4. IETF expert reviewer approves code assignment.</FONT>
<BR><FONT SIZE=2>5a. Cablelabs compliant vendors start implementing sub-option for testing </FONT>
<BR><FONT SIZE=2>and shipment to customer.</FONT>
<BR><FONT SIZE=2>5b. Draft is simultaneously submitted to RFC editor Q.</FONT>
</P>

<P><FONT SIZE=2>If all goes well, field shipments can commence just about the time the RFC </FONT>
<BR><FONT SIZE=2>exits the editor Q.</FONT>
</P>

<P><FONT SIZE=2>I'm grasping for a compromise here.&nbsp; Any suggestions?</FONT>
</P>

<P><FONT SIZE=2>Cheers,</FONT>
</P>
<BR>
<BR>
<BR>
<BR>

<P><FONT SIZE=2>--</FONT>
</P>

<P><FONT SIZE=2>Paul Duffy</FONT>
<BR><FONT SIZE=2>Cisco Systems, Inc.</FONT>
<BR><FONT SIZE=2>paduffy@cisco.com</FONT>
</P>
<BR>

<P><FONT SIZE=2>_______________________________________________</FONT>
<BR><FONT SIZE=2>dhcwg mailing list</FONT>
<BR><FONT SIZE=2>dhcwg@ietf.org</FONT>
<BR><FONT SIZE=2><A HREF="https://www1.ietf.org/mailman/listinfo/dhcwg" TARGET="_blank">https://www1.ietf.org/mailman/listinfo/dhcwg</A></FONT>
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