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Old 06-09-2007, 03:07 PM   #1
lord loh.
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Registered: May 2007
Location: Lubbock, TX
Distribution: Slackware ubuntu Arch
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Slave zone for caching.


I just thought that creating a slave zone on my server for popular sites like google.com could save me bandwidth and improve the speed.

So I tried to create a slave zone using the system-config-bind tool

I first asked for the creation of a zone.
Specified it as class IN -> OK
Forwards -> OK
zone name -> google.com.

Then I specified the parameters for master zone servers as the IP addresses of ns1.google.com through ns4.google.com

Saved and service named restart.

And LO! google.com stopped working.

When I tried to preview the slave zone file, it was clean and empty. I tried to set the refresh time to a few seconds and restarted named in the hope that the slave would update from master in vain.

So I ultimately pruned the slave zone record to get google.com back.

Where could I have gone wrong?

Please help me.

Thank you.
 
Old 06-09-2007, 03:26 PM   #2
Micro420
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Registered: Aug 2003
Location: Berkeley, CA
Distribution: Mac OS X Leopard 10.6.2, Windows 2003 Server/Vista/7/XP/2000/NT/98, Ubuntux64, CentOS4.8/5.4
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Many websites will restrict their DNS servers transferring their zone information to other random name servers, such as yours. The reason being that it would be a security risk for Google and create excess zone transfers for Google.

Is your DNS getting flooded with queries that you need to create a caching only DNS? What you should do is either set up a proxy server which stores actual files to save on WAN bandwidth. DNS does not cache files, only name/IP resolution queries for X amount of time. If you had thousands of people in your LAN querying name/IP resolutions, then DNS caching would make sense.

Last edited by Micro420; 06-09-2007 at 03:31 PM.
 
Old 06-09-2007, 03:41 PM   #3
lord loh.
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Registered: May 2007
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Distribution: Slackware ubuntu Arch
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I only wanted to cache the resolutions... It was just the paranoid in me that prompted me to do so. I do not have any problem of DNS being flooded with queries.

;-) I have got just 8 systems on my LAN... I was just being paranoid...:-D
 
Old 06-09-2007, 07:40 PM   #4
Micro420
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Registered: Aug 2003
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If you just want to cache the name resolutions, then all you need to do is install a simple DNS (BIND) server. No need to do anything else. By default, the DNS server will cache and store name resolutions for 60 minutes. You can increase this value if you want to store it in cache longer. Additionally, I believe your local Linux system also caches name resolutions, at least on Windows OS's they cache name resolutions locally.

With 8 systems on your LAN, I don't think you have to worry about query congestions against your local or ISP's name servers.
 
  


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