Re: domain name
On Sep 1, 2012, at 3:15 PM, John Hasler wrote:
> The kernel has no interest in domain names. It deals only in IP
> numbers. Dealing with DNS is the job of a resolver running in user
> space.
Thanks. I didn't know that -- makes sense. But it raises a question in
my mind: Who does, beside servers? Just 'hostname'?
I think I came into the TCP/IP networking business a little late. Was
there ever a time when there were no domains, just IPs? That could
explain a lot to me about why the domain name is so hard to get to...
> A machine can be in more than one domain.
I don't understand that. I've got several domains' nameserver records
pointed at my server, serving a number of protocols. But the server
itself is in only one domain. Apache and Postfix and Bind all handle the
different domains, but I think of all of them as virtual domains, not the
one true domain that my server is part of.
Am I thinking wrong? Or is it possible somehow for a machine to have 2 FQDNs?
I've never considered that. And I can't think of how to configure things so
'hostname --fqdn' could answer with 2 strings...
--
Glenn English
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