Re: [dhcwg] dhcwg Digest, DHCP Renew vs Confirm

Hi Huan,
      Is it ok to transmit just a Renew message containing both the IA_NA and IA_PD when the link goes down?

Regards,
Tim

On Feb 14, 2012, at 8:12 PM, Huan Huan <shawngespan@gmail.com> wrote:

> Hi Tim,
> 
> I think CE Router may transmit Confirm msg containing the assigned IA_NA and Renew msg containing the assigned IA_PD separately.
> 
> BR,
> Huan 
> 
> 2012/2/15 <dhcwg-request@ietf.org>
> If you have received this digest without all the individual message
> attachments you will need to update your digest options in your list
> subscription.  To do so, go to
> 
> https://www.ietf.org/mailman/listinfo/dhcwg
> 
> Click the 'Unsubscribe or edit options' button, log in, and set "Get
> MIME or Plain Text Digests?" to MIME.  You can set this option
> globally for all the list digests you receive at this point.
> 
> 
> 
> Send dhcwg mailing list submissions to
>        dhcwg@ietf.org
> 
> To subscribe or unsubscribe via the World Wide Web, visit
>        https://www.ietf.org/mailman/listinfo/dhcwg
> or, via email, send a message with subject or body 'help' to
>        dhcwg-request@ietf.org
> 
> You can reach the person managing the list at
>        dhcwg-owner@ietf.org
> 
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of dhcwg digest..."
> 
> 
> Today's Topics:
> 
>   1. I-D Action: draft-ietf-dhc-forcerenew-nonce-04.txt
>      (internet-drafts@ietf.org)
>   2. DHCP Renew vs Confirm (Timothy Winters)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Tue, 14 Feb 2012 02:40:41 -0800
> From: internet-drafts@ietf.org
> To: i-d-announce@ietf.org
> Cc: dhcwg@ietf.org
> Subject: [dhcwg] I-D Action: draft-ietf-dhc-forcerenew-nonce-04.txt
> Message-ID: <20120214104041.23040.30559.idtracker@ietfa.amsl.com>
> Content-Type: text/plain; charset="utf-8"
> 
> 
> 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           : Forcerenew Nonce Authentication
>        Author(s)       : David Miles
>                          Wojciech Dec
>                          James Bristow
>                          Roberta Maglione
>        Filename        : draft-ietf-dhc-forcerenew-nonce-04.txt
>        Pages           : 12
>        Date            : 2012-02-14
> 
>   Dynamic Host Configuration Protocol (DHCP) FORCERENEW allows for the
>   reconfiguration of a single host by forcing the DHCP client into a
>   Renew state on a trigger from the DHCP server.  In Forcerenew Nonce
>   Authentication the server sends a nonce to the client on the initial
>   DHCP ACK that is used for subsequent validation of a FORCERENEW
>   message.  This document updates RFC 3203.
> 
> 
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-ietf-dhc-forcerenew-nonce-04.txt
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> This Internet-Draft can be retrieved at:
> ftp://ftp.ietf.org/internet-drafts/draft-ietf-dhc-forcerenew-nonce-04.txt
> 
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Tue, 14 Feb 2012 08:43:50 -0500
> From: Timothy Winters <twinters@iol.unh.edu>
> To: dhcwg@ietf.org
> Subject: [dhcwg] DHCP Renew vs Confirm
> Message-ID: <C0CA95B6-1743-4D37-9BCC-D104453EBF9A@iol.unh.edu>
> Content-Type: text/plain; charset=us-ascii
> 
> Hello,
>        While testing some CE Router implementations we have noticed a interesting behavior that is within the specifications but not clearly documented.  I wanted to get the working group thoughts on this.
> 
>        Currently when a CE Router acting as a DHCP client, assigned both IA_NA and IA_PD, is unplugged from the network.  When reattached to the link the DHCP client transmits a DHCP Renew containing both the IA_NA and the IA_PD.
> 
>        3315 Section 18.1.2 says that when link goes down a DHCP client implementation should transmit a DHCP Confirm message containing the assigned IA_NA.
> 
>        3633 Section 12.1 doesn't allow the use of the Confirm message.  It states that DHCP Renew message, containing the assigned IA_PD, should be used when the link goes down.
> 
>        According to the specifications a DHCP client should retransmit DHCP Confirm and DHCP Renew when link goes up.   The behavior we are seeing is the DHCP client transmits a DHCP renew containing both the IA_NA and IA_PD.
> 
>        This behavior isn't causing interoperability issues as all the servers we have tried still respond properly to the DHCP Renew messages.
> 
>        Is it ok when a DHCP client loses link for it to transmit one DHCP Renew message?
> 
> Regards,
> Tim
> UNH-IOL
> 
> 
> 
> ------------------------------
> 
> _______________________________________________
> dhcwg mailing list
> dhcwg@ietf.org
> https://www.ietf.org/mailman/listinfo/dhcwg
> 
> 
> End of dhcwg Digest, Vol 94, Issue 13
> *************************************
> 
> 
> 
> -- 
> Huan Huan