virtual domains and zone files
Mark_Andrews at isc.org
Mark_Andrews at isc.org
Tue Dec 2 04:52:25 UTC 2003
> Well, I did open a can of worms, didn't I? 'Virtual domain' is such a
> common term when referring to email delivery I didn't think twice about
> using it here. If there is a more acceptable term to DNS admins, I'd
> like to know what it is because, right now, I have no other way to label
> what I'm talking about.
mail domain
> The zone file I posted really is for the arda.homelinux.net zone,
> honest. It's purpose in life is to tell hosts on my network that if
> someone sends mail to user at arda.homelinux.net, use
> callisto.arda.homeunix.net as the mail exchanger. There are no A records
> in this zone file because there are no hosts with the FQDN of
> <hostname>.arda.homelinux.net on my network. The A records for io,
> europa, and callisto reside in the arda.homeunix.net zone file. Which is
> what you might expect given that their FQDNs all end in arda.homeunix.net.
>
> All I wanted to know is whether the SOA and NS records in the
> arda.homelinux.net zone file are really necessary. Having thought about
> how hosts determine where to send mail addressed to 'virtual' domains, I
> think that they are. Of course, the whole purpose of posting my question
> was to allow people more knowledgeable than I to confirm or deny my
> suspicion.
You need the SOA and NS records if and only if arda.homelinux.net
is a seperate zone.
The MX record could just as easily been added to the homelinux.net
zone.
> So I suppose I've answered my own question. I'm surprised at how much
> consternation my question has caused, though, given the wide use of
> 'virtual' domains in email delivery and the fact (as far as I know) that
> DNS must be set up specifically to allow such delivery.
>
> For those who are interested, all my zone files and my named.conf file
> are posted on my web site. Go to:
> http://www.arda.homeunix.net/dnssetup.shtml
>
> Andrew
>
> Andrew wrote:
>
> > My mail server hosts a virtual domain that does not include any hosts in
> > it. Here is the zone file I use with this domain.
> >
> > # cat /etc/namedb/master/arda.homelinux.net.zone
> > $ORIGIN .
> > $TTL 10800 ; 3 hours
> > arda.homelinux.net IN SOA europa.arda.homeunix.net.
> > postmaster.arda.homeunix.net. (
> > 20030416 ; serial
> > 10800 ; refresh (3 hours)
> > 3600 ; retry (1 hour)
> > 604800 ; expire (1 week)
> > 3600 ; minimum (1 hour)
> > )
> > NS io.arda.homeunix.net.
> > NS europa.arda.homeunix.net.
> > MX 10 callisto.arda.homeunix.net.
> >
> > As things stand now, I can deliver mail to user at arda.homelinux.net but I
> > would like to know if this zone file looks reasonable or if there are
> > elements that don't need to be there.
> >
> > Andrew
> >
> >
> >
> >
>
>
>
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at isc.org
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