From owner-freebsd-questions Wed Dec 25 14:30:14 2002 Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4ACBE37B401 for ; Wed, 25 Dec 2002 14:30:13 -0800 (PST) Received: from rwcrmhc51.attbi.com (rwcrmhc51.attbi.com [204.127.198.38]) by mx1.FreeBSD.org (Postfix) with ESMTP id D87C143EC2 for ; Wed, 25 Dec 2002 14:30:12 -0800 (PST) (envelope-from swear@attbi.com) Received: from localhost.localdomain ([12.242.158.67]) by rwcrmhc51.attbi.com (rwcrmhc51) with ESMTP id <20021225223012051006jm1pe>; Wed, 25 Dec 2002 22:30:12 +0000 Received: from localhost.localdomain (localhost [127.0.0.1]) by localhost.localdomain (8.12.6/8.12.5) with ESMTP id gBPMTomG034774; Wed, 25 Dec 2002 14:29:50 -0800 (PST) (envelope-from swear@attbi.com) Received: (from jojo@localhost) by localhost.localdomain (8.12.6/8.12.5/Submit) id gBPMTiuv034771; Wed, 25 Dec 2002 14:29:44 -0800 (PST) (envelope-from swear@attbi.com) X-Authentication-Warning: localhost.localdomain: jojo set sender to swear@attbi.com using -f To: Kurt Bigler Cc: Subject: Re: email addresses used for lists [was: L0phtcrack] References: From: swear@attbi.com (Gary W. Swearingen) Date: 25 Dec 2002 14:29:44 -0800 In-Reply-To: Message-ID: <79of793f6v.f79@localhost.localdomain> Lines: 25 User-Agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.1 (Cuyahoga Valley) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Kurt Bigler writes: > Well that's an interesting idea. Throw-away subdomains (excuse my > terminology - maybe I'm supposed to call them host names?) imply a whole > "host" of email addresses without wasting a domain name. No excuse needed, if my reading is correct. O'Reilly's "DNS and Bind" says "The hosts are there, but they're domains, too." It says that a domain contains all the hosts within the domain. (Leaf-node domains just contain one host and have no name server serving lower-level domains.) Another book seems to agree (and notes that hosts may have domain name aliases too). Note that a domain named "freebsd.org" may contain a host named "freebsd.org" as well as lower-level domains like "xxx.freebsd.org". And a domain named "xxx.freebsd.org" may contain a host named "xxx.freebsd.org" whether or not the domain has lower-level domains. Even if you don't accept the single-host domain idea, you can say that your "sub-domain" is just shorthand for "sub-domain name" which seems to be widely-acceptable shorthand for names within the domain tree all the way to the leaves, where, in this mind-set, there are no sub-domains. -- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message