Install and Configure Caching-Only DNS Server in RHEL/CentOS 7 – Part 10

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Gabriel Cánepa

Gabriel Cánepa is a GNU/Linux sysadmin and web developer from Villa Mercedes, San Luis, Argentina. He works for a worldwide leading consumer product company and takes great pleasure in using FOSS tools to increase productivity in all areas of his daily work.

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10 Responses

  1. Manu Jain says:

    When I change the DNS server IP address at the client side, the internet stops working. I’m unable to test. Please help!!

    • @Manu Jain,
      Are you sure you have followed all the steps outlined in this guide? As you can see in the screenshots above, it should work without problems. Particularly pay attention to Step 2. You should make sure the server allows for connections from the local network, or at least from the IP of the client machine.

  2. Pang Kuo Loon says:

    How to block certain website in caching server? Manage implement in authorization named server. Kindly advise.

  3. Kay says:

    Hi, pretty good explanation. Im using a domain hoster which is pointing with an A-Record to my webserver. Do you recomment to implement a DNS caching to decrease response times?

    Thank you very much,

  4. Mouchy says:


    DNS need udp and TCP 53 open because dnsec query are ganerally larger than 512o.
    You can add dnssec support on a cache server, it’s important.

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