Subject: Re: [Softwires] TR: I-D Action:draft-lee-6man-ra-dslite-00.txt

From: Maglione Roberta <[email-masked]>
Date: Thu, 7 Oct 2010 12:22:26 +0200

Hello Med,
    I have a question about the deployment scenario you have in mind for this draft.
In the document you say: "A service provider may want to deploy DS-lite without using DHCP.", but it is not completely clear to me what is the SLAAC only scenario you are referring to.

I'm thinking about a DSL/Broadband access scenario where I have a residential gateway (RG) acting as B4 element, a BNAS terminating the IPv6 session and an additional device acting as AFTR element terminating the tunnel.
In this case the RG can potentially get 2 IPv6 prefixes:
- one to number to p2p WAN link, if the so-called, numbered model for the WAN link is used. This can be achieved either by using DHCPv6 or by using SLAAC; (if the unnumbered model is used this prefix is not present)
- a second IPv6 prefix to number the devices in the home-network, behind the RG. This prefix is obtained by the RG via DHCPv6-PD and this is always required.

My point is: if the RG is already running DHCPv6-PD in order to get a prefix for the home network, why cannot be enough to have ATFR tunnel name and address carried into DHCPv6 options?

Thanks and best regards,
Roberta

-----Original Message-----
From: [email-masked] [mailto:[email-masked]] On Behalf Of [email-masked]
Sent: martedì 28 settembre 2010 13.53
To: [email-masked]; [email-masked]
Subject: [Softwires] TR: I-D Action:draft-lee-6man-ra-dslite-00.txt

Dear all,

FYI, we have submitted this new I-D.

Comments, critiques, suggestions and questions are more than welcome.

As mentioned in the draft, the provisioning of the AFTR is a very sensitive for the delivery of the IPv4 connectivity when DS-Lite is enabled. Any failure to provision such information means the failure for the delivery of IPv4 services. Furthermore, the availability of the IPv4 connectivity services does not depend on the availability of DHCPv6 or RADIUS servers.

The draft includes in the appendix a use case for further discussion: distribute DS-Lite serviced customers among a set of deployed AFTRs. Provisioning the AFTR with an RA option simplifies this task and removes a constraint on DHCPv6 servers (no need to know where the customer is connected from). Off-line tools can be used instead for tuning the content of the information to be conveyed in an RA option. This use case has been included in the I-D to discuss whether it is a valid use case or not. We will move this use case to the core text if it is believed to be a valid scenario.

Cheers,
Med

-----Message d'origine-----
De : [email-masked] [mailto:[email-masked]] De la part de [email-masked]
Envoyé : mardi 28 septembre 2010 08:00
À : [email-masked]
Objet : I-D Action:draft-lee-6man-ra-dslite-00.txt

A New Internet-Draft is available from the on-line Internet-Drafts directories.

        Title           : IPv6 RA Option for DS-Lite AFTR Element
        Author(s)       : Y. Lee, M. Boucadair
        Filename        : draft-lee-6man-ra-dslite-00.txt
        Pages           : 8
        Date            : 2010-09-27

This document specifies a new optional extension to IPv6 Router
Advertisement to allow IPv6 routers to advertise DS-Lite AFTR
addresses to IPv6 hosts.  The provisioning of the AFTR information is
crucial to access IPv4 connectivity services in a DS-Lite context.
Means to ensure reliable delivery of this information to connecting
hosts is a must.

Furthermore, this RA option can be used as a means to distribute DS-
Lite serviced customers among a set of deployed AFTRs without
requiring a central knowledge of the underlying topology and deployed
AFTRs.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-lee-6man-ra-dslite-00.txt

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

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Internet-Draft.

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