Re: [v6ops] draft-ietf-6man-rfc4291bis prohibiting non-/64 subnets

[Erik Kline <[e-mail]>]

On 24 February 2017 at 12:41, Christopher Morrow <[e-mail]>
wrote:

> gosh people are being literal today :)
>
>
> On Thu, Feb 23, 2017 at 10:34 PM, Lorenzo Colitti <[e-mail]>
> wrote:
>
>> On Fri, Feb 24, 2017 at 12:23 PM, Christopher Morrow <
>> [e-mail]> wrote:
>>
>>> > The IESG plans to make a decision in the next few weeks, and solicits
>>> > final comments on this action. Please send substantive comments to the
>>> > [e-mail] mailing lists by 2017-03-01. Exceptionally, comments
>>> may be
>>> > sent to [e-mail] instead. In either case, please retain the
>>> > beginning of the Subject line to allow automated sorting."
>>>
>>> Nothing in the past really matters here, what matters is: "Is the bis
>>> draft all set, did we fix all the things which must be fixed before this
>>> draft becomes a real 'standard'?"
>>>
>>
>> I don't think you can say nothing in the past matters here. We know that
>> there have been host implementations that relied on this guarantee, and we
>> have to consider that if we change the standard, those implementations will
>> become non-compliant.
>>
>
> I don't think the proposed (now 160+ messages back) text really says:
> "FREE FOR ALL< NO LIMITS!!! WEEE!" it says: "Hey, if you want to use /64
> because the application you are being placed into requires it (slac, blah
> and blah and ilnp and blah - see rfc7k) then do that, else any other prefix
> length works"
>
> how's that not 'ok' for host folks? "Hi, my host is going to be in a slaac
> world.. so /64 it is!"
>

For manual assignment among consenting adults: as you like it.  (For all
prefixes longer than /64, the trailing 64bits would still end up being
unique; there is no real issue here.)

And I gather everyone agrees that at a minimum the /127 RFC and other
working-group-graduated documents should be suitably incorporated and
referenced.

Otherwise, this feels like another round of "why isn't IPv6 just 128bit
IPv4?"  IMHO having /64 as the logical unit of allocation to network leaves
is a very good thing.