Date: 25 Dec 2002 20:33:01 -0800 From: swear@attbi.com (Gary W. Swearingen) To: Adam Weinberger <adamw@FreeBSD.ORG> Cc: "Gary W. Swearingen" <swear@attbi.com>, Roman Neuhauser <neuhauser@bellavista.cz>, Kurt Bigler <kkb@breathhost.net>, freebsd-questions@FreeBSD.ORG Subject: Re: email addresses used for lists [was: L0phtcrack] Message-ID: <th65thxuv6.5th@localhost.localdomain> In-Reply-To: <20021226014311.GB215@vectors.cx> References: <BA2DF089.5927%kkb@breathhost.net> <79of793f6v.f79@localhost.localdomain> <20021225225521.GT690@freepuppy.bellavista.cz> <451y4536xb.y45@localhost.localdomain> <20021226014311.GB215@vectors.cx>
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Adam Weinberger <adamw@FreeBSD.ORG> writes:
> >> (12.25.2002 @ 1728 PST): Gary W. Swearingen said, in 2.0K: <<
> >
> > I'm not sure what that means.
...
> semantic
> adj : of or relating to the study of meaning and changes of
> meaning; "semantic analysis"
OK, good. Thanks.
I think your "dict" definitions for "domain" and "hostname" do not
disagree with mine (though they're certainly different), except for
this part for "hostname":
> On {Internet} the hostname is an {ASCII} string,
> e.g. "foldoc.doc.ic.ac.uk" which, consists of a local part
> (foldoc) and a {domain} name (doc.ic.ac.uk).
That's just wrong, if it's trying to imply that a Fully Qualified
Domain Name (like "foldoc.doc.ic.ac.uk") is not the name of a domain.
A hostname *IS* a domain name, either a FQDN or a part of one. In fact,
when configured to support default domains, the host's domain name (AKA
hostname) can also be specified as foldoc or foldoc.doc or
foldoc.doc.ic, etc. Maybe "dict" should have had "{default domain}" or
"{parent domain}" instead of "{domain}".
> > Roman Neuhauser <neuhauser@bellavista.cz> writes:
> > > Let's say you have names "fubar.org", "alpha.fubar.org", and
> > > "beta.fubar.org". There's no A RR for "fubar.org", but
> > > "alpha.fubar.org" resolves to 1.2.3.4, and "beta.fubar.org" resolves
> > > to 1.2.3.5. What is what here?
> >
> > They are all domain names and, except for "fubar.org", hostnames.
> > (No host, no hostname.)
>
> No. Only "fubar.org" is a domain name. The others are hostnames. A
> domain name is just a name, but a hostname is a label applied to
> something that exists. Every domain name can be a hostname if a computer
> responds to that name.
Do you really want to say that a Fully Qualified Domain Name is not a
domain name? Both hostnames and domain names are just labels applied to
something that exists, namely info in the DNS databases; there need not
be any physical host for a configured IP. It's a system that translates
IP numbers to domain names and vice-versa; it's the Domain Name System,
not the Host Name System. We choose to associate most domain names (the
ones with IP numbers) with something we call hosts and so we may also
call them hostnames if we want.
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