Bind 9 Administrator Reference Manual

Chapter 6. BIND 9 Configuration Reference
minimal-responses
If yes, then when generating responses the server will only add records to the authority and
additional data sections when they are required (e.g. delegations, negative responses). This may
improve the performance of the server. The default is no.
multiple-cnames
This option was used in BIND 8 to allow a domain name to allow multiple CNAME records in
violation of the DNS standards. BIND 9.2 always strictly enforces the CNAME rules both in master
files and dynamic updates.
notify
If yes (the default), DNS NOTIFY messages are sent when a zone the server is authoritative for
changes, see Section 3.3. The messages are sent to the servers listed in the zone’s NS records
(except the master server identified in the SOA MNAME field), and to any servers listed in the
also-notify option.
If explicit, notifies are sent only to servers explicitly listed using also-notify. If no, no notifies
are sent.
The notify option may also be specified in the zone statement, in which case it overrides the options
notify statement. It would only be necessary to turn off this option if it caused slaves to crash.
recursion
If yes, and a DNS query requests recursion, then the server will attempt to do all the work required
to answer the query. If recursion is off and the server does not already know the answer, it will
return a referral response. The default is yes. Note that setting recursion no; does not prevent
clients from getting data from the server’s cache; it only prevents new data from being cached as an
effect of client queries. Caching may still occur as an effect the server’s internal operation, such as
NOTIFY address lookups. See also fetch-glue above.
rfc2308-type1
Setting this to yes will cause the server to send NS records along with the SOA record for negative
answers. The default is no.
Note: Not yet implemented in BIND 9.
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