Re: IID length text [was Re: Review of draft-ietf-6man-rfc4291bis-06]

[David Farmer <[e-mail]>]

On Mon, Jan 16, 2017 at 4:04 PM, Brian E Carpenter <
[e-mail]> wrote:

> In line...
> On 17/01/2017 08:59, Fernando Gont wrote:
> > On 01/14/2017 04:49 PM, Brian E Carpenter wrote:
> >> A modest suggestion:
> >>
> >> OLD
> >>    For all unicast addresses, except those that start with the binary
> >>    value 000, Interface IDs are required to be 64 bits long.  Background
> >>    on the 64 bit boundary in IPv6 addresses can be found in [RFC7421].
> >>
> >> NEW
> >>    IPv6 routing is based on prefixes of any valid length up to 128
> [BCP198].
> >>    For example, [RFC6164] standardises 127 bit  prefixes on
> point-to-point
> >>    links. However, consistent use of Stateless Address Autoconfiguration
> >>    (SLAAC)[RFC4862] requires that all interfaces on a link use the same
> length
> >>    of Interface ID. In practice, this means that to guarantee
> interoperability
> >>    of SLAAC, a fixed length of Interface ID is necessary.
> >
> > fixed as "all nodes on the link use the same IID length" or as in "a
> > hardcoded IID length, as the current 64 value"?
> >
> > If the former, I agree. If the later, I don't.
>
> You're right, that choice of word could be contradictory.
> I suggest s/fixed/consistent/.
>
>     Brian
>

With that change I think the use of "consistent" in the previous sentence
is somewhat redundant.  How about;

   However, use of Stateless Address Autoconfiguration (SLAAC)[RFC4862]
   requires that all interfaces on a link use the same length of Interface
ID.
   In practice, this means that to guarantee interoperability of SLAAC, a
   consistent length of Interface ID is necessary.


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