Hi Tom,
  The existing text does not make it clear whether "::" MUST
always be used if there are at least two consecutive 16-bit 0 fields. This leads to ambiguity in address representations. Hence, I support the modified text that Kawamura-san proposed.

Cheers
Suresh

On 10-08-04 10:04 AM, t.petch wrote:
I object.

I think that the existing text is clearer than the text you want to replace it
with.

Tom Petch

----- Original Message -----
From: "Seiichi Kawamura" <kawamu...@mesh.ad.jp>
To: <ipv6@ietf.org>
Sent: Wednesday, August 04, 2010 1:26 PM
Subject: draft-ietf-6man-text-addr-representation AUTH48 change


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Hi

This already came up on the list once before,
and since its in AUTH48 now, I would like to
make the changes to the document.

Current section 4.2 has 3 parts, and the first two are

4.2.1.  Shorten as Much as Possible

   The use of the symbol "::" MUST be used to its maximum capability.
   For example, 2001:db8::0:1 is not acceptable, because the symbol "::"
   could have been used to produce a shorter representation 2001:db8::1.

4.2.2.  Handling One 16-Bit 0 Field

   The symbol "::" MUST NOT be used to shorten just one 16-bit 0 field.
   For example, the representation 2001:db8:0:1:1:1:1:1 is correct, but
   2001:db8::1:1:1:1:1 is not correct.

I would like to combine these two, and also clarify that you MUST
use "::" when there are more then two consecutive 0 fields.
The following is the text I plan to use.

4.2.1.  When to use "::"

   If the address contains at least two consecutive 16-bit 0 fields, "::"
   MUST be used to compress all consecutive 16-bit 0 fields.
   The symbol "::" MUST NOT be used to shorten just one 16-bit 0 field.
   For example, the representation 2001:db8:0:1:1:1:1:1 is correct, but
   2001:db8::1:1:1:1:1 is not correct.

Please let me know by Aug 6, 2010 if you have any objections to this.

Thanks and Regards,
Seiichi
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