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RFC 5952, "A Recommendation for IPv6 Address Text Representation", August 2010

Source of RFC: 6man (int)

Errata ID: 3884
Status: Rejected
Type: Technical

Reported By: Richard Hartmann
Date Reported: 2014-02-06
Rejected by: Brian Haberman
Date Rejected: 2014-02-12

Section 4.2.2. says:

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.

It should say:

4.2.2.  Incorrect use of "::"

   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.

   The symbol "::" MUST NOT be used just so. For example, the
   representation 2001:db8:1:1:1:1:1:1 is correct, but
   2001:db8:1:1::1:1:1:1 is not correct.

Notes:

You would think this should be obvious, but I have seen actual discussions that 2001:db8:1:1::1:1:1:1 is correct syntax. Explicitly forbidding this form does no harm and stops all discussions in this direction.

Thanks for your work.
--VERIFIER NOTES--
As agreed to by the document authors and the submitter, there is a reference to RFC 4291 that addresses the concern.

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