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The allow-update in the first zone clause could have been omitted since it is the default behavior.
Many people like to be cautious in case the default mode changes.
The master needs to know which nameservers to notify.
By default it notifies the ones that have By default BIND allows zone transfers from anywhere.
// fragment // key clause is shown only for illustration and would // normally be included in the file key "update-key" ; .... zone "example.com" in; zone "example.org" in; In the zone, the reference to the key clause "update-key" implies that the application that performs the update, say nsupdate, is using TSIG and must also have the same shared secret with the same key-name.
This statement may be used in a zone, view or an options clause.
Masters must be specified as IP addresses, not as domain names, however it is possible to define a ‘masters list’ containing the required addresses which can then be referred to symbolically (see below).
Zone files are optional for slave nameservers, but strongly recommended otherwise the slave will lose all knowledge of the zone content whenever it is restarted.
The most likely reason for the slave not requesting a transfer when it has received a notification is if it already has a copy of the zone with the same or a more recent serial number.
After we have installed BIND as a master DNS server (NS1) (as explained in my recent post), we can now try to set up a secondary DNS server (NS2) with BIND on Cent OS.
NS2 acts as a backup if there are problems with NS1.
The log should contain enough information to identify the cause.
You can check whether an initial zone transfer has occurred by looking for the zone file.