Question on DNS Protocols

[Mark_Andrews at isc.org]

	John,
	     He was talking about having one set of names registed
	and a *completly* differrent set in the zone.  This is never
	good practice as it leads to confusion and makes debugging
	harder.  It also has increased management as you the have
	to track the IP addresses of the real servers and update
	the A records (you can't use CNAMEs) when they change.

	Not putting the actual master as the primary, is reasonable.
	It is about time the Internic stoped asking which machine is
	the primary as it is irrelevent to the delegation process.

	Mark

> 
> On 9 Jul 1999, The Cameleon wrote:
> 
> >Hi
> 
> >What will happen if I declare in my primary DNS some DNS different from
> >what will be declared in the Internic base ?
> 
> There is no direct correlation between the SOA nameservers listed in DNS
> and the authoritative nameservers you place in your zone file, though they
> are often the same.  You can certainly list more NS entries in your zone
> file than are listed in 'NIC.  You just need to make sure that those
> nameservers can answer queries about the zone (or forward queries
> appropriately, etc).
> 
> The authoritative nameservers associated with your 'NIC record (and
> thus accessed by the root servers) are those nameservers which contain the
> SOA information for the domain: they tell the world where they can look
> for authoritative answers about a zone.  You could have 2 nameservers in
> your 'NIC record, and any number of authoritative servers listed for
> the zone.  Incidently, this is a critical part of the DNS process because
> it allows the managers of the SOA for a zone the ability to delegate
> authority for the zone to other nameservers without a need for modifying
> a 'NIC domain record.
> 
> "Primary" is a depricated term.  We prefer to think of DNS in terms of
> masters and slaves.  A master of a zone contains the master SOA record for
> the zone.  Slaves poll zone information for a zone from the master of that
> zone.  But slaves and masters are not important to the outside world.  For
> example, the root servers do not care which servers are masters or slaves
> (or what we consider primary and secondary).  It is very common to
> specify slave servers for the purpose of answering non-recursive queries
> for a zone, while you have your master zone information residing on an
> unpublished master.
> 
> >
> >
> >
> >Exemple:
> >
> >
> >On the Sur l'Internic, I have :
> >
> >
> >
> >        Domaine1.com            Primary DNS:            212.208.1.1     
> >ns1.domaine2.com
> >                                Secondary DNS:  212.208.2.20    
> >ns2.domaine2.com
> >                                Secondary DNS:  212.208.3.30    
> >ns3.domaine2.com
> >
> >On the 3 DNS above, I have only in NS :
> >
> >
> >domaine1.com    IN      NS      ns1.iri.net.
> >domaine1.com    IN      NS      ns2.iri.net.
> >domaine1.com    IN      NS      ns3.iri.net.
> >
> >Thank you in advance for your replies.
> 
> 
> ===========================================
> John N Dvorak | dvorak at capu.net
> Director of Technology
> CapuNet, LLC - Corporate Internet Solutions
> (301) 881-4900 x8018
> ===========================================
> 
> 
> 
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org