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

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>

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> Today's Topics:
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>   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
>
>
>
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> End of dhcwg Digest, Vol 94, Issue 13
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-- 
Huan Huan