Re: [2462bis] IAB recommendation on prefix lengths

[Erik Nordmark <Erik.Nordmark@xxxxxxx>]

> The above IAB recommendation is therefore a logical consequence from
> what are described in the draft because the IPv6 address architecture
> specifies the interface ID length is 64 for addresses beginning with
> binary 000.
> 
> We could still add the specific recommendation to rfc2462bis.
> However, I personally hesitate to do that since I basically prefer
> not hard-coding particular constants in general rules as long as the
> specification is clear (and, in fact, I believe the specification is
> already pretty clear on this point).
> 
> What do others think?  Any opinions or suggestions will be highly
> appreciated.

I think what you have in 2462bis is the best approach; I agree with
you that hard-coding the 000 prefix and /64 in 2462bis would be worse
since it would add complexity to implementations and probably make it
harder to evolve the IPv6 addressing architecture over time.

  Erik


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