Re: New (-02) version of IPv6 CPE Router draft is available for review

[Alain Durand <alain_durand@cable.comcast.com>]

Hemant,

I have no problem using ULA *in*the*absence*of* GUA. I understand that the
network has to be workable in the absence of upstream connectivity.

What I'd like to see is ULA being renumbered into GUA as soon as those
becomes available.

Brian is suggesting to have a mode where the user may also want to keep the
ULA *after* GUA are acquired, I'm fine with that as long as it is not the
default config.

   - Alain.


On 7/20/08 8:47 PM, "Hemant Singh (shemant)" <shemant@cisco.com> wrote:

> Alain,
> 
> Please go back to this draft's emails and see how Wes, I, and Remi
> discussed the ULA case and a MUST requirement.  Your idea below is not
> valid because you have not considered the case of a standalone CPE
> Router that is purchased from retail.  The user will power on the CPE
> Router at home and the LAN interface(s) of the router will be up first -
> the user hasn't connected the WAN port yet to the broadband network.
> The user needs some IPv6 address to configure the CPE Router via the
> web.  That is why the ULA will be used.  We have also said in our draft
> that manual configuration is out of scope of our draft - therefore we
> are not worried about details like how does the user get to know the ULA
> prior to logging on to the CPE Router over the web using this ULA.  If
> need be, we can also work on such details but there is no dispensing
> with ULA.  I too like Brian's suggestion of once per factory-reset and
> further I prefer a well-known ULA address publishes apriori in the CPE
> Router manuals for the user to use that address to configure the CPE
> Router.  After configuration, any other ULA may be generated and the
> router reset to use the new ULA and associated ULA prefix(es).
> 
> Only for the case when the CPE Router is embedded in a broadband device
> like a modem and thus managed by the SP, the ULA's will not be spawned
> as this is a WAN init first before LAN init model of our draft.  See my
> other comments about WAN init first model also complying with CableLab
> docsis 3.0 standards.
> 
> Hemant 
> 
> -----Original Message-----
> From: Alain Durand [mailto:alain_durand@cable.comcast.com]
> Sent: Friday, July 18, 2008 11:53 PM
> To: Brian E Carpenter
> Cc: Hemant Singh (shemant); v6ops@ops.ietf.org; Wes Beebee (wbeebee)
> Subject: Re: New (-02) version of IPv6 CPE Router draft is available for
> review
> 
> 
> 
> 
> On 7/18/08 11:42 PM, "Brian E Carpenter" <brian.e.carpenter@gmail.com>
> wrote:
> 
>>> I would rather like the text to recommend to only use ULA when
>>> nothing else is available and immediately renumber to GUA when those
> are acquired.
>> 
>> IMHO that is only acceptable if there MUST be a configurable option to
> 
>> support a ULA (generated once per factory-reset) in parallel with a
>> GUA, if that's what the user wants. I think that is needed for
>> scenarios where people want addresses for devices that are guaranteed
>> never to reply to external packets.
> 
> I'd agree to this if, by default, parallel ULA support is off.
> 
>   - Alain.
> 
> 
>