How do I disable IPv6 on my server?

Question

How do I disable IPv6 on my server?

Answer

Note: cPanel's support staff cannot modify your server's network on your behalf. It is recommended that you have the steps outlined in this article performed by a system administrator.

1. Access the server's command line as the root user via SSH or Terminal in WHM.
2. Open /etc/sysctl.conf in your preferred text editor.

3. Add the following lines to the file:

   CONFIG_TEXT: net.ipv6.conf.all.disable_ipv6 = 1
   net.ipv6.conf.default.disable_ipv6 = 1

4. Save the changes and exit the text editor.

5. Run the following command to enable the settings.

   # sysctl -p

Warning: If you remove the kernel modules for IPv6, your operating system will generate warnings in cPanel & WHM, may prevent account creation, and may cause service failures.

Additional Resources

IPv6 Server Administration