Re: IPv6 prefix lengths - how long?

[David Farmer <[e-mail]>]

I mostly agree with Brian, other than that are many advantages to alignment
on nibble boundaries with the hexadecimal representation of IPv6 addresses.
So, any of the 16 nibble aligned options seem fine with me; /64, /68, /72,
/76, /80, /84, /88, /92, /96, /100, /104, /108, /112, /116, /120, /124. So,
personally, I would argue against /118 on that principle.

Thanks.

On Fri, Jun 7, 2019 at 3:53 PM Brian E Carpenter <
[e-mail]> wrote:

> I can't speak for the other authors of draft-bourbaki-6man-classless-ipv6,
> but my answer is: this question isn't our business. If we disestablish
> the /64 boundary, we surely don't replace it with a new one.
>
> Privacy considerations are probably a determining factor, as we
> hinted in https://tools.ietf.org/html/rfc7421#section-4.5
>
> Regards
>    Brian
>
> On 08-Jun-19 05:43, Templin (US), Fred L wrote:
> > Hi, we all know about the tussle regarding the /64 boundary for IPv6
> prefixes but
> >
> > assuming that we will one day want to allow longer prefixes the question
> is “how long”?
> >
> >
> >
> > We all know about /127 for point to point links, but I am not talking
> about those. I am
> >
> > talking about prefixes that are assigned to nodes that might be acting
> either as routers
> >
> > or as multi-addressed hosts.
> >
> >
> >
> > Because of RFC7934, we see the value of Host Address Availability
> Recommendations.
> >
> > It makes the point that, due to the nature of multi-addressing supported
> by IPv6, it
> >
> > would be useful for each node to be able to configure multiple (perhaps
> even many)
> >
> > IPv6 addresses from an IPv6 prefix. But, “how many”?
> >
> >
> >
> > My assertion is that a multi-addressed host (or, an End User Network
> router) should
> >
> > support numbering for at least 1K IPv6 addresses. This would imply that
> (assuming
> >
> > at some point the /64 boundary is relaxed) the longest IPv6 prefix
> should be a /118.
> >
> >
> >
> > Thoughts?
> >
> >
> >
> > Fred
> >
> >
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> >
>
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