Re: [v6ops] Implementation Status of PREF64

[Gert Doering <[e-mail]>]

Hi,

On Tue, Oct 12, 2021 at 08:12:22AM +0000, Pascal Thubert (pthubert) wrote:
> When that???s the case, and the node needs, say, less than 1000 addresses, could we delegate a /118?
> This way, we can build a /64 NBMA subnet, which maintains the subnet boundary at /64, but allow routing inside.
> We could, e.g., terminate vxlan on the /118 and use routing over them.
> I would love to see that???

This is an interesting comment indeed.

I do not feel comfortable with giving out /64 or larger to "random
devices connecting to Wifi", as that (think "1000 devices in a building")
will drastically increase the number of subnets required for a generic
office building - where a /56 might be sufficient before, with plenty of
headroom, you'd then need a full /48 (or more, if you want/need to keep 
routing aggregated, and have to set aside something like a /52 per 
"end device segment").

Now, "something which will aggregate to a /64 in total, for an arbitrary
number of devices" - like, a /96, given 4 billion addresses each to up to
4 billion devices - would definitely be something nice to have.

But I assume that this is not going to work, as I hear that this is 
not (only) for "things happening inside the device" but also "tethering",
which would require a /64 then.  Which, incidentially, is a use case
not desired in Enterprise context.

Gert Doering
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have you enabled IPv6 on something today...?

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