Multiple nameservers on one server

[Eight32]

On Tue, 2006-03-28 at 18:36 +0100, Paul Howarth wrote:
> Eight32 wrote:
> > On Tue, 2006-03-28 at 16:12 +0100, Paul Howarth wrote: 
> >> Stuart Murray-Smith wrote:
> >>> I want to set up a DNS server that will 'emulate' multiple nameservers
> >>> on one server ie when queried, the answer will appear as if _this_
> >>> physical server is the SOA for _this_ domain only.
> >> What is it about a server handling multiple domains that gives it away 
> >> as handling multiple domains rather than just the one that's being 
> >> queried? I can't think of anything offhand.
> >>
> >>> How would I list multiple reverse lookup (zzz.yyy.xxx.rev) files in named.conf?
> >> Same way that you would handle any other multiple zones; there's nothing 
> >> special about reverse zones.
> >>
> >> Paul.
> > 
> > Hi Paul.
> > 
> > Thank you for replying :-)
> > 
> > I've Googled and only ever seen examples of named.conf's with one
> > reverse zone (yet multiple forward zones [1, 2, ..., n] for which the
> > reverse zone is SOA). I'm trying to provide primary nameserver services
> > to multiple domains such that:
> > 
> > /etc/named.conf looks like:
> > 
> > -----8<----------8<----------8<----------8<----------8<-----
> > 
> > zone "yyy.xxx.www.in-addr.arpa" {
> > 	type master;
> > 	file "/var/named/yyy.xxx.www.rev";
> > 	allow-query { any; };
> > 	};
> > 
> > -----8<----------8<----------8<----------8<----------8<-----
> > 
> > and /var/named/yyy.xxx.www.rev looks like:
> > 
> > -----8<----------8<----------8<----------8<----------8<-----
> > 
> > $TTL 3600
> > $ORIGIN yyy.xxx.www.IN-ADDR.ARPA.
> > ;
> > @ IN SOA ns1.domainname_0.tld. admin.domainname_0.tld. (
> > 		0603240000 ; serial
> > 		10800      ; refresh
> > 		3600       ; retry
> > 		604800     ; expire
> > 		10800      ; minimum
> > 		)
> > ;
> > 		IN NS ns1.domainname_0.tld.
> > ;
> > 		IN NS ns1.domainname_1.tld.
> > ...
> > 		IN NS ns1.domainname_n.tld.
> > ;
> > 		vvv.www.xxx.yyy IN PTR ns1.domainname_0.tld.
> > ;
> > 		vvv.www.xxx.yyy IN PTR ns1.domainname_1.tld.
> > ...
> > 		vvv.www.xxx.yyy IN PTR ns1.domainname_n.tld.
> > 
> > ;
> > 
> > -----8<----------8<----------8<----------8<----------8<-----
> > 
> > I'm going to guess that I can either adopt the following naming scheme
> > by changing the generic:
> > 
> > file "/var/named/yyy.xxx.www.rev";
> > 
> > to:
> > 
> > file "/var/named/yyy.xxx.www.domainname_0.rev";
> > 
> > in /var/named.conf say,
> > 
> > -----8<----------8<----------8<----------8<----------8<-----
> > 
> > zone "yyy.xxx.www.in-addr.arpa" {
> > 	type master;
> > 	file "/var/named/yyy.xxx.www.domainname_0.rev";
> > 	allow-query { any; };
> > 	};
> > 
> > zone "yyy.xxx.www.in-addr.arpa" {
> > 	type master;
> > 	file "/var/named/yyy.xxx.www.domainname_1.rev";
> > 	allow-query { any; };
> > 	};
> > 
> > ...
> > 
> > zone "yyy.xxx.www.in-addr.arpa" {
> > 	type master;
> > 	file "/var/named/yyy.xxx.www.domainname_n.rev";
> > 	allow-query { any; };
> > 	};
> > 
> > -----8<----------8<----------8<----------8<----------8<-----
> >  or change statements in reverse zones by having one 'type master;' and
> > the others 'type slave;'?
> 
> No, you can't do this. A given IP address should live in only one zone. 
> Whilst it's possible to have multiple PTR records for an IP address, 
> it's rather pointless.
> 
> Let's think about this a different way.
> 
> Supposing you have domainname_0.com and domainname_1.com, with:
> 
> www.domainname_0.com = 10.1.2.3
> www.domainname_1.com = 10.1.2.4
> 
> And presumably the reverse lookups for those IPs should result in the 
> same hostnames. What else do you need apart from this (which is a bog 
> standard configuration)? Answer in terms of DNS queries and results 
> rather than how you think it should be configured.

Hi Paul.

Thank you for this, and I agree that the above you've described is a
standard config, where the IP lives in one zone with one SOA. While I
was replying to your email about further 'wonderings'... the penny
dropped.

Thanks again!

Regards,

Stu@