Difference between secondary and slave dns servers

Mark Andrews Mark_Andrews at isc.org
Tue Nov 14 23:28:30 UTC 2006

> smallpond wrote:
> > voipfc wrote:
> >   
> >> What is the difference between secondary and slave dns servers?
> >>
> >> Are they synonyms or are there some subtle diffference between them?
> >>     
> >
> > Slave Servers
> > The other authoritative servers, the slave servers (also known as
> > secondary servers) ...
> >
> > from the bind documentation.
> >   
> Yeah, they're pretty much synonymous. If there's any subtle difference 
> between the two, it's that "slave" is more often seen in a _relational_ 
> context, i.e. one half of the "master/slave" relationship, whereas 
> "secondary" is more often used when describing a whole infrastructure 
> (although I have occasionally see the term "primary" being used as a 
> synonym for "master").
> Let's not forget, also, that a "slave" server can also serve as a 
> "master" to other, downstream slaves, in a "multi-hop" architecture. So 
> the use of the term "secondary" gets a little confusing at that point. 
> What do we call the downstream slaves? "Tertiaries"? And the slaves 
> downstream from those? Calling them all just "slaves" simplifies things.
> - Kevin

	Also some people thought that "primary" server got all the
	initial queries and the "secondaries" only got queries if
	the "primary" failed.

	"master" / "slave" does not have the same conations.
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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