Hi,
> It would better if it also specified where to use :: if there
> is more than one run of zeros. As in
>
> If an address contains more than one group of zeros where "::"
> could be used, only the {least|most} significant such group
> may be represented by "::".
>
> Take your pick between "least" and "most".
>
> If we don't have such a rule, I fear that the only unambiguous rule for
> prefixes is to avoid abbreviation.I think that RFC 5952 (an update on RFC 4291) provides the guidance you describe in section 4.2.3. - Sander
smime.p7s
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