[v6ops] Re: [E] New Version Notification for draft-mishra-v6ops-variable-iids-problem-statement-01.txt

[Daryll Swer <[e-mail]>]

>
> It is absolutely not the intent to require that every host get a /64 in
> networks that don't have enough address space. That would be hugely
> limiting. That's the reason we are defining the P flag in the PIO - so
> networks can choose whether hosts will attempt PD or not. Networks have
> always been able to choose to use SLAAC, or DHCPv6 IA_NA, or both. Now they
> can choose to support PD-per-device as well.
>

If the use case is for endpoints to have a small prefix delegation for
IPv6/v4 translation mechanism and potentially future applications as well,
wouldn't it be perfectly fine to:
1. Have a /64 per VLAN with either regular SLAAC or ia_na for WAN interface
of the endpoints to get a /128?
2. Have a /64 (or smaller) prefix pool per VLAN, where the DHCPv6 server
will hand out nothing smaller than a /127 to the endpoints via ia_pd?

*--*
Best Regards
Daryll Swer
Website: daryllswer.com
<https://mailtrack.io/l/523398b7a9492fd4ddb5eb273369d1430090e4f6?url=https%3A%2F%2Fwww.daryllswer.com&u=2153471&signature=2b36518259290d4d>


On Fri, 20 Sept 2024 at 06:26, Lorenzo Colitti <lorenzo=
[e-mail]> wrote:

> It is absolutely not the intent to require that every host get a /64 in
> networks that don't have enough address space. That would be hugely
> limiting. That's the reason we are defining the P flag in the PIO - so
> networks can choose whether hosts will attempt PD or not. Networks have
> always been able to choose to use SLAAC, or DHCPv6 IA_NA, or both. Now they
> can choose to support PD-per-device as well.
>
> On Fri, Sep 20, 2024 at 6:07 AM Jeremy Duncan <[e-mail]>
> wrote:
>
>> Gert-
>>
>> Yes, I understand it's 256 hosts when you are assigning a /64 per node.
>> But as the specific draft references:
>>
>> "   *  In small networks (e.g., home networks), where the number of
>>       clients is not too high, the number of available prefixes becomes
>>       a limiting factor.  If every phone or laptop in a home network
>>       were to request a unique prefix suitable for SLAAC, the home
>>       network might run out of prefixes, if the prefix allocated to the
>>       CPE by its ISP is too small (e.g., if an ISP delegates a /60, it
>>       would only be able to delegate 15 /64 prefixes to clients).  So
>>       while the enterprise network administrator might want all phones
>>       in the network to request a prefix, it would be highly undesirable
>>       for the same phone to request a prefix when connecting to a home
>>       network."
>>
>> However, I will say I agree that this one single use case could have
>> potential issues if these 2 things are true:
>> 1. DHCPv6-PD is enforced for all nodes
>> 2. the network's allocation is only a /56 or /60
>>
>> However, if that were the case it would only affect a specific situation.
>> And is this even the intent behind this draft from the authors Lorenzo,
>> Jen, and Xiao?
>>
>>
>> -Jeremy
>>
>> -----Original Message-----
>> From: Gert Doering <[e-mail]>
>> Sent: Thursday, September 19, 2024 4:57 PM
>> To: Jeremy Duncan <[e-mail]>
>> Cc: Brian Candler <[e-mail]>; Gert Doering <[e-mail]>; Mark
>> Smith <[e-mail]>; Lorenzo Colitti <lorenzo=
>> [e-mail]>; IPv6 Operations <[e-mail]>
>> Subject: Re: [v6ops] Re: [E] New Version Notification for
>> draft-mishra-v6ops-variable-iids-problem-statement-01.txt
>>
>> Hi,
>>
>> On Thu, Sep 19, 2024 at 05:21:35PM +0000, Jeremy Duncan wrote:
>> > " If you are also required to give a /64 to every device that wants to
>> use DHCP-PD, and your ISP only gives you a /56, then that would limit you to
>> > <256 such devices in your network."
>> > **that's wrong. It's 256 /64 subnets
>>
>> Please read up on
>>
>> https://datatracker.ietf.org/doc/draft-ietf-v6ops-dhcp-pd-per-device/
>>
>> .. that's the point here.
>>
>> Gert Doering
>>         -- NetMaster
>> --
>> have you enabled IPv6 on something today...?
>>
>> SpaceNet AG                      Vorstand: Sebastian v. Bomhard, Ingo
>> Lalla,
>>                                            Karin Schuler, Sebastian Cler
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>> DE813185279
>>
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