On 2011-09-20 11:21, Sander Steffann wrote:
> 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.
I see that it does (and the errata on 4291 do not). Thanks.
A reasonable prefix will end with at least 64 zeros, so :: will
always be the last element according to RFC 5952. (Unless someone
uses prefixes longer than /64, in which case I for one don't care.)
Brian
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