Re: [v6ops] What problem are we trying to solve? (Re: A broken promise - "You said PD Prefix Valid Lifetime is going to be X" (Re: SLAAC renum: Problem Statement & Operational workarounds))

Tassos Chatzithomaoglou <achatz@forthnet.gr> Wed, 13 November 2019 07:33 UTC

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From: Tassos Chatzithomaoglou <achatz@forthnet.gr>
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Subject: Re: [v6ops] What problem are we trying to solve? (Re: A broken promise - "You said PD Prefix Valid Lifetime is going to be X" (Re: SLAAC renum: Problem Statement & Operational workarounds))
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Mark Smith wrote on 13/11/19 00:28:
> On Wed, 13 Nov 2019 at 08:20, Tassos Chatzithomaoglou
> <achatz@forthnet.gr> wrote:
>>
>> Fernando Gont wrote on 12/11/19 16:33:
>>> On 12/11/19 04:11, Tassos Chatzithomaoglou wrote:
>>>
>>>> The subscriber should have the choice to decide and the technology should give the means to support his/her choices.
>>>> We're building a page inside our subscriber portal, where the subscriber chooses how frequently the LAN IPv6 assigned prefix should change.
>>>> Default is to change at every PPP reconnect, but the subscriber can choose specific periods (x weeks/months) or action (once at next reconnect).
>>> So, upon a CPE crash and reboot, the subscriber would get a different
>>> prefix. Right?
>>>
>>> Thanks!
>>>
>>> Cheers,
>> Yes, the current default is for the subscriber to get a different prefix after a CPE crash and reboot (like in IPv4).
> "like in IPv4"
>
> Why are you giving customers delegated IPv6 prefixes - that's not like IPv4?
Between ULA+NAT66 and PD we chose PD due to CPEs supporting it by default (and following the end-to-end connectivity principle).
>
> Other than "like in IPv4", why are you making the PD prefix change
> upon reconnect when you don't have to?
We do the same in IPv4 because many subscribers had asked for it. They wanted to easily (disconnect the line or reboot the CPE) change addresses.
> What if your competitors provide stable prefixes, and their customers
> get a better service experience than your customers do, without having
> to wait possibly years for CPE and/or host upgrades per this ID's
> proposal?
> What is stopping them doing that? If they already have stable prefix
> supporting infrastructure, why wouldn't they switch it on when they
> can, when it could mean stealing customers from you and reducing their
> numbers of helpdesk calls?
>
That's mostly a commercial decision. Commercially we want to differentiate static vs dynamic.
The biggest technical issue i see is routing de-aggregation due to many different BRAS serving the same customers.
Aggregating at another level is not an option, because we don't want to have hundreds of thousands of /56s at this level.

Note: Largest percentage of our IPv6 related helpdesk calls is about DS-Lite subscribers having problems using a service requiring port forwarding (and their CPE doesn't support PCP), which we then change to the default Dual-Stack.

>> But a CPE crash is not a common case. The most common case for prefix change is a DSL disconnect (due to line issues) or a PPP disconnect (due to network issues).
>> Also, many of our CPEs store internally the prefix, so after a PPP reconnect they inform the LAN hosts about its release.
>>
>> --
>> Tassos
>>
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