On 2011-09-20 09:23, Nathan Ward wrote:
> On 20/09/2011, at 9:19 AM, Iljitsch van Beijnum wrote:
>
>> My position is that prefixes should always end in :: so the address part is
>> a valid address and the same code can be used to parse addresses, prefixes
>> and addresses with a prefix length.
>
> Agreed. Shortening IPv4 addresses to things like 10/8 makes sense because we
> don't have another way to do shortening. If we did (i.e. 10../8 or something)
> then we'd use that.
It's unfortunate, I think, that RFC 4291 just says:
The use of "::" indicates one or more groups of 16 bits of zeros.
The "::" can only appear once in an address. The "::" can also be
used to compress leading or trailing zeros in an address.
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.
Brian
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