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RE: Review requested: draft-ietf-radext-delegated-prefix-03.txt



I don’t know at what stage we are in with respect to this draft, but it seems that the draft lacks a description of the use case that it is trying to address. The introduction seems to be conveying very little about the motivation for this document:

 

“  

The Delegated-IPv6-Prefix is a RADIUS attribute [1] that carries an

   IPv6 prefix to be delegated to the user, for use in the user's

   network. 

 

Comment: Delegated-IPv6-Prefix is NOT a RADIUS attribute that is defined in reference [1] i.e. RFC 2865. If it was, we would not need this document.

 

For example, the prefix in a Delegated-IPv6-Prefix

   attribute can be delegated to another node through DHCP Prefix

   Delegation [2].

Comment: If prefix delegation by DHCP as described in RFC 3633 already exists, then why we need another mechanism? RFC 3633 has figure 1 which shows the prefix delegation scenario.  I request that the authors clarify using this figure where the RADIUS transaction with this attribute applies.

 

-Kuntal

 


From: owner-radiusext@ops.ietf.org [mailto:owner-radiusext@ops.ietf.org] On Behalf Of Bernard Aboba
Sent: Tuesday, October 03, 2006 5:04 PM
To: 'Behcet Sarikaya'
Cc: radiusext@ops.ietf.org
Subject: RE: Review requested: draft-ietf-radext-delegated-prefix-03.txt

 

In RADIUS/Diameter Accounting messages announce both the beginning and end of a session.

 


From: Behcet Sarikaya [mailto:behcetsarikaya@yahoo.com]
Sent: Tuesday, October 03, 2006 2:05 PM
To: Bernard Aboba
Cc: radiusext@ops.ietf.org
Subject: Re: Review requested: draft-ietf-radext-delegated-prefix-03.txt

 

Hello Bernard, I agree with your changes, please also add this typo too:

The AVP flag rules [5] for the Delegate-IPv6-Prefix attribute are:
->The AVP flag rules [5] for the Delegated-IPv6-Prefix attribute are:

Is session termination communicated with Accounting Request message in Radius/Diameter?

 

Thanks,

 

Behcet

----- Original Message ----
From: Bernard Aboba <bernard_aboba@hotmail.com>
To: radiusext@ops.ietf.org
Sent: Tuesday, October 3, 2006 3:21:42 PM
Subject: Review requested: draft-ietf-radext-delegated-prefix-03.txt

A new version of the Delegated Prefix attribute has been posted to the
archive:
http://www.ietf.org/internet-drafts/draft-ietf-radext-delegated-prefix-03.txt

This document has already gone through IESG review, so it is one step away
from publication.

Can people take a look at it?

I found one typo, in Section 5:

   The AVP flag rules [5] for the Delegate-IPv6-Prefix attribute are:

                                            +---------------------+
                                            |    AVP Flag rules   |
                                            |----+-----+----+-----|----+
                   AVP  Section             |    |     |SHLD| MUST|    |
   Attribute Name  Code Defined  Value Type |MUST| MAY | NOT|  NOT|Encr|
   -----------------------------------------|----+-----+----+-----|----|
   Framed-IPv6-      97  6.11.6  OctetString| M  |  P  |    |  V  | Y  |
     Prefix                                 |    |     |    |     |    |


Here the attribute should be Delegated-IPv6-Prefix, not Framed-IPv6-Prefix;
the AVP should be TBD instead of 97, and the Section Defined entry should be
deleted.

One other quibble.   In Section 1, it is stated:

"   The Framed-IPv6-Prefix attribute [4] is not designed to carry an IPv6
   prefix to be used in the user's network, and therefore Framed-IPv6-
   Prefix and Delegated-IPv6-Prefix attributes may be included in the
   same RADIUS packet."

It strikes me that this statement is not necessarily accurate.  For example,
if a bridge device connected to a NAS, then in fact the Framed-IPv6-Prefix
attribute *could* be used to carry an IPv6 prefix to be used in the user's
network.  However, if we are talking about a router, then this will not
work.  So I think the sentence should be changed to:

"  The Framed-IPv6-Prefix attribute [4] is not designed to support
delegation of prefixes to
   be used in the user's network, and therefore Framed-IPv6-Prefix and
Delegated-IPv6-Prefix
   attributes may be included in the same RADIUS packet."



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