Re: valid chars in host names
John C Klensin <KLENSIN@infoods.mit.edu> Tue, 23 November 1993 03:06 UTC
Received: from ietf.nri.reston.va.us by IETF.CNRI.Reston.VA.US id aa15543; 22 Nov 93 22:06 EST
Received: from CNRI.RESTON.VA.US by IETF.CNRI.Reston.VA.US id aa15539; 22 Nov 93 22:06 EST
Received: from venera.isi.edu by CNRI.Reston.VA.US id aa21892; 22 Nov 93 22:06 EST
Received: from INFOODS.MIT.EDU by venera.isi.edu (5.65c/5.61+local-14) id <AA22863>; Mon, 22 Nov 1993 18:59:49 -0800
Received: from INFOODS.UNU.EDU by INFOODS.UNU.EDU (PMDF V4.2-13 #2603) id <01H5MO6BHIOG0019QW@INFOODS.UNU.EDU>; Mon, 22 Nov 1993 21:59:26 EST
Date: Mon, 22 Nov 1993 21:59:26 -0500
Sender: ietf-archive-request@IETF.CNRI.Reston.VA.US
From: John C Klensin <KLENSIN@infoods.mit.edu>
Subject: Re: valid chars in host names
In-Reply-To: <9311222248.AA03866@berserkly.cray.com>
To: dab@berserkly.cray.com
Cc: ietf-hosts@isi.edu
Message-Id: <754023566.560936.KLENSIN@INFOODS.UNU.EDU>
X-Envelope-To: ietf-hosts@ISI.EDU
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; CHARSET="US-ASCII"
Content-Transfer-Encoding: 7bit
Mail-System-Version: <MultiNet-MM(330)+TOPSLIB(156)+PMDF(4.2)@INFOODS.UNU.EDU>
>According to RFC-1123/RFC-952, the only valid characters in a
>host name are alpha-numerics and a hyphen. Has anything relaxed
>those rules since then to allow other characters (like and
>underscore)?
David,
If my memory is correct, the "no underscores" part of the restriction
predates the DNS and is due mainly to human factors reasons: you permit
two inter-word separators, and people can't remember which one to use
and get to be driven crazy by getting that wrong. Absent really
compelling reasons, the rule should probably continue to stand.
And, to answer your precise question, "nope, not yet as far as I know".
john
- valid chars in host names David Borman
- Re: valid chars in host names John C Klensin