How Do I Create a Caching-Only DNS Server?


Heather Bennett

Creating a Caching-Only DNS Server

Do you want to set up your own caching-only DNS server? Look no further!

In this tutorial, we will guide you through the process step by step. But first, let’s understand what a caching-only DNS server is and why it is useful.

What is a Caching-Only DNS Server?

A caching-only DNS server, also known as a resolver, is a type of DNS server that retrieves and stores DNS records in its cache. When a client requests information about a domain name, the caching-only DNS server first checks its cache for the corresponding record.

If it finds it, it can provide the answer without having to query other authoritative DNS servers. This not only speeds up the resolution process but also reduces the load on the network.

Why Create Your Own Caching-Only DNS Server?

There are several reasons why you might want to create your own caching-only DNS server:

  • Improved Performance: By having a local caching server, you can reduce latency and speed up website loading times for your users.
  • Reduced Network Traffic: With cached records, there is no need to query external DNS servers repeatedly for frequently accessed domains, saving bandwidth.
  • Better Privacy and Security: By controlling your own DNS server, you can ensure that your queries are not logged or intercepted by third parties.

Setting Up Your Own Caching-Only DNS Server

To create a caching-only DNS server, follow these steps:

Step 1: Install BIND

Firstly, we need to install BIND (Berkeley Internet Name Domain), one of the most widely used implementations of the DNS protocol. Use your package manager to install BIND on your server. For example, on Ubuntu, you can run the following command:

sudo apt-get install bind9

Step 2: Configure BIND

Once installed, you need to configure BIND to act as a caching-only DNS server. Open the main configuration file located at /etc/bind/named.conf.options and make the following changes:

  • Add the IP addresses of reliable external DNS servers under the forwarders option. These servers will be used if a record is not found in the cache.
  • Enable recursion by setting allow-recursion to “any” or specify a specific IP range.
  • Adjust other options such as listen-on and allow-query based on your network configuration.

Step 3: Restart BIND

After making the necessary changes, save the file and restart BIND for the changes to take effect. On Ubuntu, you can use this command:

sudo systemctl restart bind9

Congratulations! You’ve Set Up Your Own Caching-Only DNS Server!

Your caching-only DNS server is now up and running! Point your clients to its IP address as their primary DNS server, and they will benefit from improved performance and reduced network traffic.

In conclusion, creating a caching-only DNS server can greatly enhance your network’s efficiency and security. By following the steps outlined in this tutorial, you now have all the tools to set up your own caching-only DNS server with ease. Happy networking!

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