Re: IID length text

Le 14/01/2017 à 20:49, Brian E Carpenter a écrit :
> 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. For all currently
>    allocated unicast addresses, except those that start with the binary
>    value 000, that length is 64 bits. Note that this value is an arbitrary
>    choice and might be changed for some future allocation of unicast address
>    space. Background on the 64 bit boundary in IPv6 addresses can be found
>    in [RFC7421].

I agree with the change suggestion.  The new text and references are 
enough motivation to clarify that that 64bit limit is an arbitrary 
choice and might change in the future.

Alex

>
> Regards
>    Brian
>
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