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Date: Mon, 06 Dec 2004 11:25:04 -0800
From: Ulrich Drepper <drepper@redhat.com>
Organization: Red Hat, Inc.
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To: Andreas Steinmetz <ast@domdv.de>
CC: "Randy.Dunlap" <rddunlap@osdl.org>,
       Jan Engelhardt <jengelh@linux01.gwdg.de>, linux-kernel@vger.kernel.org
Subject: Re: host name length
References: <40521AA6.7070308@redhat.com> <20041203160538.77a22864.rddunlap@osdl.org> <Pine.LNX.4.53.0412060934450.11891@yvahk01.tjqt.qr> <41B48C9E.6030607@osdl.org> <41B49773.1010006@domdv.de>
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Andreas Steinmetz wrote:

> 63 characters per label (=hostname) as to:

A "label" is only a part of the fqdn:

<domain> ::= <subdomain> | " "

<subdomain> ::= <label> | <subdomain> "." <label>

<label> ::= <letter> [ [ <ldh-str> ] <let-dig> ]


Yes, each label can only have 63 bytes, but the entire fqdn can be
longer, much longer.  And the hostname stored with sethostname() should
be the fqdn of the machine, not just one lalbel (in DNS speak).

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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