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After Using `networksetup -setdnsservers Wi-Fi "8.8.8.8" "8.8.4.4"` How Do I Clear Them?

8 min read Oct 01, 2024
After Using `networksetup -setdnsservers Wi-Fi

Resetting DNS Settings on macOS After Using networksetup -setdnsservers

The networksetup -setdnsservers command is a powerful tool for managing DNS settings on macOS. It allows you to set custom DNS servers for specific network interfaces, such as Wi-Fi or Ethernet. However, if you need to revert to the default DNS settings or change the configured servers, you might find yourself wondering how to clear the custom DNS settings you previously set. This article will guide you through the process of resetting your DNS settings after using the networksetup -setdnsservers command, offering a comprehensive breakdown of various methods and considerations.

Understanding DNS Settings on macOS

Before we dive into the reset process, let's understand how DNS settings work on macOS. DNS (Domain Name System) translates human-readable domain names (like google.com) into numerical IP addresses that computers can understand. When you visit a website, your computer contacts a DNS server to resolve the domain name to its corresponding IP address.

macOS uses a hierarchical system for DNS settings. The primary source of DNS information is the DHCP server assigned by your internet service provider (ISP). When you connect to a network, the DHCP server provides you with an IP address and other configuration details, including a list of DNS servers. However, you can override these default DNS settings by manually setting custom DNS servers using the networksetup command.

Resetting DNS Settings: Methods and Considerations

Now, let's explore different methods to clear the DNS settings you set with the networksetup -setdnsservers command:

1. Using networksetup -setdnsservers Wi-Fi ""

This method is the most straightforward way to clear custom DNS settings for a specific network interface.

  1. Open Terminal: Go to Applications > Utilities and launch the Terminal application.
  2. Run the Command: Enter the following command, replacing Wi-Fi with the name of your network interface (e.g., Ethernet):
    networksetup -setdnsservers Wi-Fi ""
  3. Verify: Check if the DNS servers have been cleared by running:
    networksetup -getdnsservers Wi-Fi

This command will clear any custom DNS servers you set for your Wi-Fi connection and revert to the default DNS settings provided by your DHCP server.

2. Using System Preferences

You can also reset your DNS settings using the System Preferences application:

  1. Open System Preferences: Click on the Apple menu and select System Preferences.
  2. Go to Network: Click on the Network icon.
  3. Select Your Network Interface: Select the network interface (Wi-Fi or Ethernet) you want to modify.
  4. Advanced Options: Click the Advanced... button.
  5. DNS Tab: Go to the DNS tab.
  6. Remove Custom Servers: Click the + button to add a DNS server, then immediately click the - button to remove any custom DNS servers. This will leave only the default DNS servers provided by your DHCP server.
  7. Apply Changes: Click OK and then Apply to save the changes.

This method allows you to visually manage and edit your DNS settings, providing a more user-friendly interface compared to the command-line approach.

3. Releasing and Renewing DHCP Lease

Releasing and renewing your DHCP lease can sometimes clear any custom DNS settings you've set. This is because DHCP provides the initial DNS configuration, and renewing the lease effectively refreshes these settings.

  1. Open Terminal: Go to Applications > Utilities and launch the Terminal application.
  2. Release DHCP Lease: Run the following command, replacing Wi-Fi with your network interface:
    sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
  3. Renew DHCP Lease: Once the DHCP lease is released, run the following command to renew it:
    networksetup -renewdhcp Wi-Fi

This process forces macOS to re-request the DHCP lease and associated settings, which might clear any custom DNS entries.

Considerations and Best Practices

  • Default DNS Servers: When you clear custom DNS settings, macOS reverts to the DNS servers provided by your DHCP server. These are usually the servers assigned by your ISP.
  • Network Configuration: If you're experiencing DNS issues after clearing custom DNS settings, ensure your network configuration is correct. Check your internet connection, router settings, and any firewall configurations that might interfere with DNS resolution.
  • Security: Be cautious about setting custom DNS servers, especially if you're using a public Wi-Fi network. Malicious actors could set up fake DNS servers to intercept your traffic and steal sensitive information.
  • Performance: Custom DNS servers can improve performance by directing traffic to specific servers known for speed and reliability. However, choosing the right DNS server can be crucial, as a poorly performing server can negatively impact your internet experience.

Conclusion

Clearing custom DNS settings after using networksetup -setdnsservers is a straightforward process. You can choose the method that best suits your needs and comfort level. Remember to always prioritize secure DNS settings and consider the performance implications of custom DNS servers. By understanding the process and applying these techniques, you can effectively manage your DNS settings on macOS and ensure a smooth and secure internet experience.

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