Re: [Sip] draft-ietf-sip-ipv6-abnf-fix-04

["Vijay K. Gurbani" <[e-mail]>]

Robert: Please see question directed to you at the end of this
email.

Dale Worley wrote:
> As long as we're explicating the syntax, it seems reasonable to
> enunciate what "everybody knows" about its interpretation.

Dale: I am not being an obstructionist here, so please
do not take the comments as such.

I believe that "everybody knows" that dotted-decimal is
well, dotted-"decimal" and not dotted-"octal".  The fact
that some C libraries interpret the leftmost 0 as a
hint to enter octal mode is unfortunate, but I don't see
how putting admonitions here will solve that particular
problem.

That said, one quick observation is that the production rule for
<IPv4address> literal defined in rfc3986 is more close
to your intent than the one defined in rfc3261.  More
specifically, here they are:

rfc3986:

A host identified by an IPv4 literal address is represented in
dotted-decimal notation (a sequence of four decimal numbers in the
range 0 to 255, separated by "."), as described in [RFC1123] by
reference to [RFC0952].  Note that other forms of dotted notation may
be interpreted on some platforms, as described in Section 7.4, but
only the dotted-decimal form of four octets is allowed by this
grammar.

    IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet

    dec-octet   = DIGIT                 ; 0-9
                / %x31-39 DIGIT         ; 10-99
                / "1" 2DIGIT            ; 100-199
                / "2" %x30-34 DIGIT     ; 200-249
                / "25" %x30-35          ; 250-255

rfc3261:

IPv4address    =  1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT

So, we could deprecate the existing rfc3261 syntax for IPv4address
and replace it with the one for rfc3986.

Robert: Is this okay with you?  If so, I can put the above change
in the draft as well.

Thanks,

- vijay
-- 
Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent
1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60566 (USA)
Email: vkg@{alcatel-lucent.com,bell-labs.com,acm.org}
Web:   http://ect.bell-labs.com/who/vkg/