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1 How do I enable Response Rate Limiting (RRL) on BIND 9.9.4?

BIND 9.9.4 (and higher) provides support for Response Rate Limiting (RRL). However, it is not enabled by default when building BIND. The reason for this is that BIND 9.9 is an Extended Support Version of BIND and per our policy on mangement of ESVs, we do…

2 Why does my authoritative-only nameserver try to query the root nameservers?

Check first that recursion really is disabled: recursion no; This will prevent your nameserver from performing iterative queries on behalf of any client queries that it receives, but it won't prevent your server from needing to make queries of its own in…

3 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…

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

When named starts under some configurations it may log a message like: 03-May-2013 18:42:02.807 open: 3bf305731dd26307.nzf: file not found Why does it do that? What is an .nzf file and what happens if named can't find one? Most BIND operators are familiar…

5 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…

6 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…

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

By default, BIND 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. By default, BIND will use both IPv4 and IPv6 transport…

8 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…

9 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…

10 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…

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