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RFC 5321, "Simple Mail Transfer Protocol", October 2008

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: app

Errata ID: 2467
Status: Rejected
Type: Editorial

Reported By: Michael Rushton
Date Reported: 2010-08-16
Rejected by: Pete Resnick
Date Rejected: 2011-06-11

Section 4.1.3 says:

   IPv6-comp      = [IPv6-hex *5(":" IPv6-hex)] "::"
                  [IPv6-hex *5(":" IPv6-hex)]
                  ; The "::" represents at least 2 16-bit groups of
                  ; zeros.  No more than 6 groups in addition to the
                  ; "::" may be present.

   IPv6v4-full    = IPv6-hex 5(":" IPv6-hex) ":" IPv4-address-literal

   IPv6v4-comp    = [IPv6-hex *3(":" IPv6-hex)] "::"
                  [IPv6-hex *3(":" IPv6-hex) ":"]
                  IPv4-address-literal
                  ; The "::" represents at least 2 16-bit groups of
                  ; zeros.  No more than 4 groups in addition to the
                  ; "::" and IPv4-address-literal may be present.

It should say:

   IPv6-comp      = [IPv6-hex *6(":" IPv6-hex)] "::"
                  [IPv6-hex *6(":" IPv6-hex)]
                  ; The "::" represents at least 1 16-bit groups of
                  ; zeros.  No more than 7 groups in addition to the
                  ; "::" may be present.

   IPv6v4-full    = IPv6-hex 5(":" IPv6-hex) ":" IPv4-address-literal

   IPv6v4-comp    = [IPv6-hex *4(":" IPv6-hex)] "::"
                  [IPv6-hex *4(":" IPv6-hex) ":"]
                  IPv4-address-literal
                  ; The "::" represents at least 1 16-bit groups of
                  ; zeros.  No more than 5 groups in addition to the
                  ; "::" and IPv4-address-literal may be present.

Notes:

As per RFC 4291 and RFC 3986, "::" can represent a single 16-bit group of zeroes.
--VERIFIER NOTES--
As per RFC 5952:

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.

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