Question

BIND9 is not caching responses.

Asked by: davepusey

I have a BIND9-based DNS server set up here at home.

I serves as the master for a couple of internal domains, and everything else is resolved via a forwarders directive in the config file.

The problem is that the server goes out the forwarders to get an ip address every single time a domain name is requested.

If i request www.google.co.uk 10 times in a row, it does 10 requests out to the forwarders. This seems to indicate that the server is not caching responses.

How can i make it cache responses so that subsequent requests for the same domain name dont require a request to the forwarders.

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Asked On
2009-07-11 at 11:21:42ID24562622
Topics

Domain Name Service (DNS)

,

Debian Linux

,

Linux Networking

Participating Experts
2
Points
500
Comments
8

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Answers

 

by: ravenplPosted on 2009-07-12 at 00:16:30ID: 24833507

Are You sure You are using the local bind9 as resolver (/etc/resolv.conf)
Have You configured caching nameserver in bind(zone ".") or just forwarders?

 

by: ravenplPosted on 2009-07-12 at 00:17:04ID: 24833508

Also, I suggest to use http://members.home.nl/p.a.rombouts/pdnsd/index.html as caching resolver instead of full fledged dns server.

 

by: davepuseyPosted on 2009-07-12 at 04:29:31ID: 24834028

>> Are You sure You are using the local bind9 as resolver (/etc/resolv.conf)

Yes!

>> Have You configured caching nameserver in bind(zone ".") or just forwarders?

Please explain.

>> Also, I suggest to use http://members.home.nl/p.a.rombouts/pdnsd/index.html as caching resolver instead of full fledged dns server.

I still need the ability to host a few zones so I think BIND is still the best choice.

 

by: ravenplPosted on 2009-07-12 at 04:51:21ID: 24834077

> http://www.langfeldt.net/DNS-HOWTO/BIND-9/DNS-HOWTO-3.html
To have bind caching, it has to have hint zone "." configured.
Additionally You could use the glibc build-in dns caching with nscd service
service nscd status

 

by: davepuseyPosted on 2009-07-12 at 08:51:03ID: 24834760

Yes the root zone is there... as included in the original installation...

// prime the server with knowledge of the root servers
zone "." {
        type hint;
        file "/etc/bind/db.root";
};
                                              
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Select allOpen in new window

 

by: davepuseyPosted on 2009-07-12 at 08:52:07ID: 24834766

I've been unable to find any type of cache file, or any config for it.

Perhaps this is what's missing?

Unfortunatly I don't know how to configure such a file.

 

by: amprantiPosted on 2009-08-12 at 09:03:03ID: 25080064

May you paste here your named.conf.options  file?

 

by: davepuseyPosted on 2009-08-12 at 10:18:55ID: 25080746

I've fixed it now by removing the forwarder directives, and adding the root hint zone.

20120131-EE-VQP-002

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