The transfer of DNS zones is one of the many methods available to administrators in order to replicate DNS databases across a group of DNS servers.
The Transfer IPs are IP addresses that are allowed to transfer (copy) the zone information from the DNS server, which is master or slave for the zone. These IPs will be recorded in the named.conf file in the ACL (Access Control Lists) clauses.
To access the Transfer management page, click the Transfer IP addresses button. This is where you can find a set of details about the DNS Zone: DNS Zone type and Last DNS Zone update.
Master zones
For master zones, you can define the list of slave DNS servers that are allowed to transfer data about your zone.
Using + buttons you can add Slave DNS server IP in your zone.
Both IPv4 and IPv6 IP addresses are allowed.
These IP addresses will be added in named configuration file (named.conf) in allow-transfer directive.
Slave zones
For slave zones, you can define the list of master and slave DNS servers that are allowed to transfer data about your zone.
Master DNS server's IP
This is the IP where the master zone is defined. The master IP allows slaves to refresh their zone record when the 'expiry' parameter of the SOA Record is reached. If a slave cannot reach the master DNS when the 'expiry' time has been reached, it will stop responding to requests for the zone. It will not use time-expired data.
The master DNS for each zone is defined in the 'masters' statement of the zone clause in named configuration file (named.conf).
Both IPv4 and IPv6 IP addresses are allowed.
Slave DNS server's IP address
Slave zones can also be Master for other servers. This way, you can add IP addresses of slave servers, which will replicate the zone from this one.
These IP addresses will be added in named configuration file (named.conf) in allow-transfer directive.
Both IPv4 and IPv6 IP addresses are allowed.
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