Disable writing to macOS DNS cache

Disable writing to macOS DNS cache

When you browse the internet, your computer uses a system called DNS (Domain Name System) to translate domain names (like www.example.com) into IP addresses. macOS keeps a cache of these translations to speed up future requests. However, there may be situations where you want to disable writing to the macOS DNS cache, such as when troubleshooting network issues or when you need to ensure the most up-to-date DNS information is always used. In this article, we will guide you through the process of disabling writing to the macOS DNS cache.

Step 1: Open Terminal

The first step is to open the Terminal application on your macOS. You can do this by following these steps:

1. Click on the Spotlight icon (magnifying glass) in the top-right corner of your screen.
2. Type "Terminal" in the search bar.
3. Click on the Terminal application in the search results to open it.

Step 2: Disable writing to DNS cache

Once you have the Terminal open, you can disable writing to the macOS DNS cache by entering a command. Follow these steps:

1. Type the following command in the Terminal window:

sudo launchctl stop com.apple.mDNSResponder

You will be prompted to enter your administrator password. Type your password and press Enter. Note that when you type your password, it won't be displayed on the screen for security reasons. Press Enter again to execute the command.

After executing the command, the writing to the macOS DNS cache will be disabled. This means that any changes made to the DNS settings or any DNS resolutions will not be cached by macOS.

Step 3: Verify the DNS cache status

If you want to verify whether the writing to the macOS DNS cache has been successfully disabled, you can use the following command:

sudo killall -INFO mDNSResponder

This command will display the current status of the DNS cache. Look for the line that says "NoMulticastAdvertisements" followed by either "Enabled" or "Disabled." If it shows "Disabled," it means that writing to the DNS cache has been successfully disabled.

Step 4: Re-enable writing to DNS cache

If you want to re-enable writing to the macOS DNS cache at any point, you can use the following command:

sudo launchctl start com.apple.mDNSResponder

Enter your administrator password when prompted, and press Enter to execute the command. Writing to the DNS cache will be re-enabled, and macOS will start caching DNS resolutions again.

It's important to note that disabling writing to the macOS DNS cache can have an impact on browsing speed, especially when visiting websites that you have previously accessed. However, it can be useful in certain situations where you need to ensure the most up-to-date DNS information is always used.

Conclusion

Disabling writing to the macOS DNS cache can be helpful when troubleshooting network issues or when you need to ensure the most current DNS information is always used. By following the steps outlined in this article, you can easily disable and re-enable writing to the macOS DNS cache using the Terminal application.

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