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The primary master name server determines which servers are the slaves for the zone by looking at the list of NS records in the zone and taking out the record that points to the name server listed in the MNAME field of the zone's SOA record as well as the domain name of the local host. Restarting a primary master name server causes it to notify all of its slaves of the current serial number of all of its zones because the primary master has no way of knowing whether its zone data files were edited before it started.Reloading one or more zones with new serial numbers causes a name server to notify the slaves of those zones.The rule precendence, if multiple rules match (e.g.overlapping address ranges), is not for stricter or more specific rules.Unfortunately, neither BIND 8 nor BIND 9 allows you to turn off NOTIFY announcements on a server-by-server basis.BIND 8 and 9 even have a provision for adding servers besides those in your zone's NS records to your "NOTIFY list." For example, you may have one or more unregistered slave name servers (described in Chapter 8, "Growing Your Domain") and you'd like them to pick up changes to the zone quickly.
Each ACL rule can allow one or more actions for given address/subnet/TSIG, or deny them.
In any case, just the first – in the order of rules in zone or template acl configuration item, not in the order of declarations in acl section – matching rule applies and the rest is ignored.
See following examples and acl: - id: address_rule address: [2001:db8::1, 192.168.2.0/24] action: transfer - id: deny_rule address: 192.168.2.100 action: transfer deny: on zone: - domain: acl1.
Other than that, NOTIFY messages look very much like queries for the SOA record for a zone: they specify the domain name of the zone whose serial number has changed, its class, and a type of SOA. When a slave receives a NOTIFY announcement for a zone from one of its configured master name servers, it responds with a NOTIFY response.
The response tells the master that the slave received the NOTIFY announcement so that the master can stop sending it NOTIFY announcements for the zone.