How to configure multiple domains on a single delgation?
Mark Andrews
Mark_Andrews at isc.org
Mon Mar 8 21:33:12 UTC 2004
> In article <c2ie9l$p5c$1 at sf1.isc.org>, Jim <me at privacy.net> wrote:
>
> > For discussion purposes:
> > 1) a.b.c.d/29 classless delegation
> > 2) a.b.c.1 is the delegation address (network)
> > 3) a.b.c.2 is not assigned or used.
> > 4) a.b.c.3 thru a.b.c.6 will be A.domain
> > 5) a.b.c.7 will be B.domain
> > 6) a.b.c.8 is the broadcast address.
Well normally it would 0-7, 8-15, ...
> > Does the ISP have to create CNAME records for each domain?
The ISP creates CNAME records for each reverse record in
the /29 reverse space. It is up to you to assign names to
the machines in that space. It doesn't matter which forward
zone the names refer to.
Parent zone: c.b.a.in-addr.arpa.
@ SOA ...
@ NS ...
@ NS ...
;
0-7 NS <your name server>.
0-7 NS <slave server>.
0 CNAME 0.0-7
1 CNAME 1.0-7
2 CNAME 2.0-7
3 CNAME 3.0-7
4 CNAME 4.0-7
5 CNAME 5.0-7
6 CNAME 6.0-7
7 CNAME 7.0-7
Child zone: 0-7.c.b.a.in-addr.arpa.
@ SOA ...
@ NS <your name server>.
@ NS <slave server>.
;0 PTR unassigned
;1 PTR unassigned
2 PTR host1.A.domain.
3 PTR host2.A.domain.
4 PTR host3.A.domain.
5 PTR host4.A.domain.
6 PTR host1.B.domain.
;7 PTR unassigned ; broadcast
Your named.conf.
zone "c.b.a.in-addr.arpa" {
type slave;
file "c.b.a.in-addr.arpa.db";
masters { <ISP's nameservers>; };
};
zone "0-7.c.b.a.in-addr.arpa" {
type master;
file "0-7.c.b.a.in-addr.arpa.db";
};
> > Or, as the ISP states:
> > We have delegated your addresses to NS.A.domain. If you want to
> > run a second domain, NS.A.domain is the authority for B.domain.
> >
> > This does not seem correct to me. a.b.c.1 points to a.b.c.3 as
> > A.domain. A.domain cannot reference B.domain in the zone file.
> >
> > Creating a nameserver on B.domain will do everything except a
> > reverse lookup as there is no glue record between it an ISP.
> >
> > Or is my understanding that lacking?
>
> I don't understand your questions at all, because you're confusing many
> terms. Please re-post with the *actual* addresses you're using, so we
> can query the real DNS servers and see how they're set up.
>
> --
> Barry Margolin, barmar at alum.mit.edu
> Arlington, MA
> *** PLEASE post questions in newsgroups, not directly to me ***
>
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
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