5.3.10. Disabling IPv6 on VPS

In Linux-like operating systems, you can disable IPv6 both for all interfaces and for a specific one. There are generic methods that can be applied to all operating systems.

For all interfaces

  1. Go to the directory /etc/sysctl.d/:
    cd /etc/sysctl.d/
  2. Add to file 99-sysctl.conf the necessary parameters to disable IPv6 in any of the following ways:
    • Or edit the file manually using some editor:
      vi 99-sysctl.conf

      Add the following lines to the end of the file: 

      net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
    • Or run the command to insert the required lines at the end of the file:
      printf "\n net.ipv6.conf.all.disable_ipv6 = 1 \n net.ipv6.conf.default.disable_ipv6 = 1" >> 99-sysctl.conf
  3. Apply changes:
    sysctl -p
  4. Check if IPv6 is configured on the server:
    ifconfig

For a specific interface

  1. Determine which interface needs to disable IPv6. You can display a list of all interfaces with the command:
    ifconfig

    The command output will look something like this:For example, the desired interface will be called eth0.

  2. Go to the directory /etc/sysctl.d/:
    cd /etc/sysctl.d/
  3. Add to file 99-sysctl.conf the necessary parameters to disable IPv6 in any of the following ways:
    • Or edit the file manually using some editor:
      vi 99-sysctl.conf

      Add the line to the end of the file: 

      net.ipv6.conf.eth0.disable_ipv6 = 1

      Instead eth0 specify the desired interface.

    • Or run the command to insert the required lines at the end of the file:
      printf "\n net.ipv6.conf.eth0.disable_ipv6 = 1" >> 99-sysctl.conf

      Instead eth0 specify the desired interface.

  4. Apply changes:
    sysctl -p
  5. Check if IPv6 is configured on the server:
    ifconfig
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