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How to Disable IPv6 for Linux via Terminal

This guide explains how to disable IPv6 on Linux using the terminal. Disabling IPv6 may help prevent connectivity issues and ensure proper compatibility with CyberGhost services that only support IPv4 connections.

Note: For the purposes of this tutorial, we have used Ubuntu as an example; however, the steps are very similar on most other Linux distributions.

  1. Open Terminal. 

    The Ubuntu application launcher grid, with the "Terminal" icon highlighted in a yellow box.

  2. Type sudo nano /etc/sysctl.d/99-disable-ipv6.conf  

    A terminal window displaying the command "sudo nano /etc/sysctl.d/99-disable-ipv6.conf" highlighted in a yellow box.

  3. If prompted, enter your password.

    A terminal window requesting user authentication with the text "[sudo: authenticate] Password:" highlighted in a yellow box.

  4. Inside the editor, copy and paste the text from the box below: 

    Nano text editor window inside a terminal, displaying three configuration lines set to "1" highlighted in a yellow box.

    net.ipv6.conf.all.disable_ipv6 = 1 
net.ipv6.conf.default.disable_ipv6 = 1 
net.ipv6.conf.lo.disable_ipv6 = 1

  5. Press Ctrl + O to save the file, then press Ctrl + X to return to the previous screen. Type sudo sysctl --system to force the system to load the new rules immediately without requiring a reboot. 

    A terminal window displaying the command "sudo sysctl --system" highlighted in a yellow box.

  6. Check the results. Fields ending in =1 indicate that the function is disabled. 

    A terminal window showing various system parameters, with the three IPv6 disable configuration lines highlighted at the bottom in a yellow box.

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