Technical References

Sets the retry interval for forwarding a DNS query in slave-mode.
These queries are recursive, and may require more time for the
forwarder to resolve.
To ensure the server tries all forwarders, set this value to the
'request-expiration-time' divided by one less than the total
number of configured forwarders.
slave-mode bool default = disabled
Specifies whether you want this server to be a slave server; that
is, a server that relies entirely on forwarders for data that
is not in its cache. Default is false (disable).
This attribute takes effect only if you specify the corresponding
forwarders.
Note: You can override slave-mode for specific domains with the
exception-list property.
subnet-sorting bool default = disabled
Controls whether DNS reorders A records when responding to client
queries. Default is false (disable).
As implemented in BIND 4.9.7, the Network Registrar DNS
server confirms the client?s network address before responding to
a query. If the client, server, and target of the query are on the
same subnet, and the target has multiple A records, the server tries
to reorder the A records in its response by putting the target?s
closest address first in the response packet.
Because clients often only look at the first record in a set,
enabling this attribute can help localize network traffic onto
a subnet. This attribute is only applied on answers to queries
from clients located on the same subnet as the DNS server.
tcp-query-retry-time rangetime(10s-5m) default = 10s
Defines the retry time for DNS queries over a TCP connection.
Cisco recommends that you set this value to less than
'request-expiration-time'.
transfer-source-address ipaddr
Specifies the source IP address that the DNS server uses to send
transfer and SOA requests to other servers.
A value of 0.0.0.0 indicates that operating system uses the best
local address based on the destination.
transfer-source-port rangeint(0-65535)
Specifies the UDP port number that the DNS server uses to send
transfer and SOA requests to other servers.
A value of 0 (zero) indicates that you should choose a random port.
If this attribute is unset, then queries are sent from the port
used to listen for queries (see local-port-num).
traps-enabled flags(all=1, server-start=2, server-stop=3, ha-dns-partner-down=4, ha-dns-partner-
up=5, ha-dns-config-error=6, masters-not-responding=7, masters-responding=8, secondary-zone-
expired=9, forwarders-not-responding=10, forwarders-responding=11)