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11 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…

12 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…

13 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…

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

In BIND 9.6-ESV-R5, 9.7.4, 9.8.1 (and newer versions of 9.6-ESV, 9.7 and 9.8 that supersede them), the warning message below may be encountered when named is starting: Warning: 'empty-zones-enable/disable-empty-zone' not set: disabling RFC 1918 empty zones…

15 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…

16 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…

17 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…

18 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…

19 Should I use rndc reconfig or rndc reload when changing my nameserver configuration files?

If you make a change to your named.conf that you want named to start using then use rndc reconfig. rndc reconfig will also load any new zones that you've added (and remove any that you no longer have defined), but it won't detect any changes that you've made…

20 Converting Zone Files Between Text and Raw Formats

With the development of the BIND 9.9 branch, zone file storage for slaved zones has been changed to expect the raw zone format by default. BIND administrators testing 9.9 or preparing for migration from an earlier version have asked how to deal with this…