To: "Hollenbeck, Scott" <firstname.lastname@example.org>
From: George Belotsky <email@example.com>
Date: Fri, 13 Apr 2001 19:24:30 -0400
In-Reply-To: <DF737E620579D411A8E400D0B77E671D750948@regdom-ex01.prod.netsol.com>; from firstname.lastname@example.org on Fri, Apr 13, 2001 at 06:05:48PM -0400
Subject: Re: A Comment on 9.  of the requirements document.
Scott: Section 2.3.1 is the **preferred name syntax**, as clearly indicated. It says explicitly in 2.3.3 that "... future additions beyond current usage may need to use the full binary octet capabilities in names, so attempts to store domain names in 7-bit ASCII or use of special bytes to terminate labels, etc., should be avoided". Hence, it would appear that an RFC 1035-compliant implementation must preserve all 8 bits of each octet whenever possible. In sum, RFC 1035 says 2 things: (i) store names into DNS as per the ABNF in 2.3.1. (ii) when implementing DNS software, ensure that it will be able to support all 8 bits per character (except the null) as per 2.3.3. Thus, RFC 1035 does not restrict the encoding in the DNS to the 7-bit subset -- in fact, it strongly discourages such a restriction. What RFC 1035 does restrict is what a user, system administrator, etc. is allowed to put in the DNS. While the above distinctions are subtle, they are sometimes very relevant. For example, getting it wrong can result in non-compliant implementations, which may be significant. George. On Fri, Apr 13, 2001 at 06:05:48PM -0400, Hollenbeck, Scott wrote: > > -----Original Message----- > > From: George Belotsky [mailto:email@example.com] > > Sent: Friday, April 13, 2001 3:01 PM > > To: Hollenbeck, Scott > > Cc: firstname.lastname@example.org > > Subject: Re: A Comment on 9.  of the requirements document. > > > > > > Please note 2.3.3. You are specifically told to avoid storing > > labels as 7-bit ASCII. > > The ABNF specification provided in RFC1035 section 2.3.1 is unambiguous WRT > labels used to represent domain and host names. > > <Scott/> -- ----------------------------- George Belotsky Senior Software Architect Register.com, inc. email@example.com 212-798-9127 (phone) 212-798-9876 (fax)