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Re: Evaluation: draft-ietf-dhc-dhcpv6-opt-prefix-delegation - IPv6 Prefix Options for DHCPv6

Ted Hardie           [   ]     [   ]     [  x ]     [   ]

I think the document is struggling between describing a
very specific use case (see figure 5.1, as an example) and
a more general description of the protocol mechanism.
In this section:

Section 5.1

  The prefix delegation options can be used in conjunction with other
   DHCP options carrying other configuration information to the
   requesting router.  The requesting router may, in turn, then provide
   DHCP service to hosts attached to the internal network.  For example,
   the requesting router may obtain the addresses of DNS and NTP servers
   from the ISP delegating router, and then pass that configuration
   information on to the subscriber hosts through a DHCP server in the
   requesting router.

and this:

7. Overview of DHCP with Prefix Delegation

   Prefix delegation with DHCP is independent of address assignment with
   DHCP.  A requesting router can use DHCP for just prefix delegation or
   for prefix delegation along with address assignment and other
   configuration information.

I see elements of that tension.  I believe the document would be
stronger if it focused clearly on the use of this option for the
purpose of managing delegation, and eliminated the descriptions of how
other options might be used in concert with it.  Those descriptions do
not seem to me sufficient specifications to actually use those
options, and I don't see pointers to other work where complete specifications
can be found.  An alternative is, of course, to provide pointers to those
specifications, but I understand from Thomas that that work is either
incomplete or not underway.  If the working believes it can easily expand
the specifications to be complete, that is yet another option (albeit one
with considerably more creep).

At 9:22 AM -0400 8/1/03, IESG Secretary wrote:

Last Call to expire on: 2003-06-24

        Please return the full line with your position.

                      Yes  No-Objection  Discuss  Abstain
Harald Alvestrand    [   ]     [   ]     [   ]     [   ]
Steve Bellovin       [   ]     [   ]     [   ]     [   ]
Randy Bush           [   ]     [   ]     [   ]     [   ]
Bill Fenner          [   ]     [   ]     [   ]     [   ]
Ned Freed            [   ]     [   ]     [   ]     [   ]
Ted Hardie           [   ]     [   ]     [   ]     [   ]
Russ Housley         [   ]     [   ]     [   ]     [   ]
Allison Mankin       [   ]     [   ]     [   ]     [   ]
Thomas Narten        [ X ]     [   ]     [   ]     [   ]
Erik Nordmark        [   ]     [   ]     [   ]     [   ]
Jon Peterson         [   ]     [   ]     [   ]     [   ]
Margaret Wasserman   [ X ]     [   ]     [   ]     [   ]
Bert Wijnen          [   ]     [   ]     [   ]     [   ]
Alex Zinin           [   ]     [   ]     [   ]     [   ]

2/3 (9) Yes or No-Objection opinions needed to pass.

DISCUSSES AND COMMENTS:
======================



^L
---- following is a DRAFT of message to be sent AFTER approval ---
From: The IESG <iesg-secretary@ietf.org>
To: IETF-Announce:;
Cc: Internet Architecture Board <iab@iab.org>,
    RFC Editor <rfc-editor@isi.edu>, <dhcwg@ietf.org>
Subject: Protocol Action: 'IPv6 Prefix Options for DHCPv6' to
         Proposed Standard

The IESG has approved the Internet-Draft 'IPv6 Prefix Options for DHCPv6'
<draft-ietf-dhc-dhcpv6-opt-prefix-delegation-04.txt> as Proposed Standard.
This document is the product of the Dynamic Host Configuration Working
Group. The IESG contact persons are Thomas Narten and Margaret Wasserman.

Technical Summary

The Prefix Delegation options provide a mechanism for automated
delegation of IPv6 prefixes using DHCP. This mechanism is intended
for delegating a long-lived prefix from a delegating router (e.g., at
an ISP) to a requesting router (e.g., at a customer site), across an
administrative boundary, where the delegating router does not require
knowledge about the topology of the links in the network to which the
prefixes will be assigned.

The Prefix Delegation option makes it possible for an ISP to
dynamically assign a prefix of arbitraty size (e.g., a /64 or /48) to
an end site, with the end site taking responsibility for further
sub-dividing the prefix and assigning subnet numbers to its internal
links.

Working Group Summary

There was WG consensus for this document in both the DHC and IPv6 WGs.

Protocol Quality

This protocol has been reviewed for the IESG by Thomas Narten. The
option has been implemented (e.g., it is being tested at
interoperability events) and some ISPs in Japan have started using it.