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It is impossible to determine from a query result that it came from a zone master or slave.

Diagram 2 DNS Slave Server The term 'slave' was introduced with BIND 8.x and replaced the term 'secondary'.

Nevertheless, the following terms are commonly used to describe the primary function or requirement of DNS servers.

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These configurations confuse two distinct but related functions.

If a server is going to provide caching services then it must support recursive queries and recursive queries need access to the root servers which is provided via the 'type hint' statement.

The default BIND behaviour is to cache and this is associated with the recursion parameter (the default is 'recursion yes').

There are many configuration examples which show caching behaviour being defined using a type hint statement in a zone declaration.

As such it provides excellent - if complex to configure - functionality.

The down side of generality is suboptimal performance on any single function - in particular caching involves a non-trivial performance overhead.

Both servers could be any combination of master-slave, slave-slave or even master-master.

If you are running Stealth Servers and wish them to be notified you will have to add an also-notify parameter as shown in the BIND file fragment below: You can turn off all NOTIFY operations by specifying 'notify no' in the zone declaration.

If a DNS server receives a query for a zone for which it is neither a Master nor a Slave then it will act as configured (in BIND this behaviour is defined in the file): A master DNS server can NOTIFY zone changes to defined (typically slave) servers - this is the default behaviour.

NOTIFY messages ensure zone changes are rapidly propagated to the slaves (interrupt driven) rather than rely on the slave server periodically polling for changes.

There are now a number of alternate Open Source DNS servers some of which stress performance.

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