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11 Why is my slave server trying sometimes to use a different source IP address for zone transfers?

There are several configuration options in named.conf that control which IPv4 and/or IPv6 source addresses are used for the SOA refresh queries and for the zone transfers themselves. See the Administrator Reference Manual for more details. The well-known…

12 Why does named log an error '3bf305731dd26307.nzf: file not found' when starting up?

This article may not apply to the version of BIND you are using Starting with versions 9.11.3 and 9.12.0, BIND will no longer log the messages described below. When named starts under some configurations it may log a message like: 03-May-2013 18:42:02.807…

13 When does rndc reconfig flush the cache?

Why does rndc reconfig flush the cache sometimes but not on other occasions? Usually when issuing rndc reconfig to make changes to a running BIND 9 nameserver, you expect it to retain the current working cache of learned RRsets. However, there are a few changes…

14 How do I configure multiple views to share the same recursive cache?

The attach-cache option is used to configure cache-sharing between views. attach-cache cache_name; By default, each view has its own unique cache. When using the attach-cache option, you can specify a name for the cache that named creates for a view. If multiple…

15 Is it possible to configure BIND to use both IPv6 and IPv4 on the same server?

By default, BIND (prior to version 9.10) does not listen for client queries on IPv6, but you can enable it by adding this option: listen-on-v6 { any; }; This will cause named to listen on all IPv4 and IPv6 configured interfaces. listen-on-v6 default changed…

16 Why does named log an error 'disabling RFC 1918 empty zones' when starting up?

In obsolete versions of BIND, named could log this message at startup: Warning: 'empty-zones-enable/disable-empty-zone' not set: disabling RFC 1918 empty zones This behavior was eliminated in BIND 9.9.0. All branches that contained this log message have passed…

17 Why are queries for some PTR records no longer forwarded since upgrading to BIND 9.9.0?

This behaviour may be encountered due to the introduction of automatic empty zones for RFC 1918 prefixes if you are using IP addresses within the RFC 1918 private address space. BIND provides a number of empty zones that are automatically configured and loaded…

18 Why does rndc log warning key file ... exists, but using default configuration file (rndc.conf)?

After upgrading BIND to a current version, you might be surprised to see this warning when using rndc commands (although the command should still work as before, unless you've made other configuration changes): WARNING: key file (rndc.key) exists, but using…

19 What do the log entries 'adb: grow_entries ..' mean?

Question: I am getting the following informational messages on starting named after installing bind 9.8.1-P1 on a set of resolvers: 18-Nov-2011 03:35:14.872 database: info: adb: grow_entries to 1531 starting 18-Nov-2011 03:35:14.874 database: info: adb: grow_entries…

20 How do DNS dynamic updates find the 'right' server?

The way that clients (receiving their IPs via DHCP) or DHCP servers (handing out IP addresses) know which server to send DDNS updates to is by querying DNS for the SOA record of the domain to which the dynamic update should be made. BY default, dynamic updates…