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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.Nevertheless, the following terms are commonly used to describe the primary function or requirement of DNS servers.
Diagram 1 DNS Master Master status is defined in BIND by including 'type master' in the zone declaration section of the file as shown by the following fragment.
When a master DNS receives Queries for a zone for which it is authoritative then it will respond as 'Authoritative' (AA bit is set in a query response).
There is no requirement in such a configuration for the master server to appear in an NS RR for the domain.
The only requirement is that two (or more) name servers support the zone.
There can be any number of slave DNS's for any given zone.
Slave status is defined in BIND by including 'type slave' in the zone declaration section of the file as shown by the following fragment.
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.
Most DNS servers are schizophrenic - they may be masters (authoritative) for some zones, slaves for others and provide caching or forwarding for all others.Tags: Adult Dating, affair dating, sex dating