Prerequisites

• An already provisioned Webdock server
• A sudo shell user
• SSH access to your server.

Temporarily Disabling IPv6

Using sysctl IPv6 can be disabled. However, these changes are not permanent. So after you reboot your server, IPv6 will start working again. If you want IPv6 disabled permanently, skip to the next relevant section.

Execute the below commands to disable IPv6 temporarily.

$ sudo sysctl -w net.ipv6.conf.all.disable_ipv6=1
$ sudo sysctl -w net.ipv6.conf.default.disable_ipv6=1
$ sudo sysctl -w net.ipv6.conf.lo.disable_ipv6=1

Now, IPv6 will be disabled and pinging an IPv6 address will not work, for example.

Permanently Disabling IPv6

For Ubuntu/Debian servers:

To disable IPv6, run

For Ubuntu:

$ sudo nano /etc/netplan/50-cloud-init.yaml

Comment the IPv6 lines with "#" so that it looks something like this:

For Debian:

$ sudo nano /etc/systemd/network/10-cloud-init-eth0.network

Comment the IPv6 lines with "#" so that it looks something like this:

Reboot the server now for the changes to take affect.

If you want to re-enable IPv6, just undo the changes (remove the "#"s) and reboot your server.

For AlmaLinux/CentOS servers:

On AlmaLinux and CentOS servers, we use NetworkManager to configure network. To disable IPv6, run

$ sudo nano /etc/sysconfig/network-scripts/ifcfg-eth0

Comment the IPv6 lines with "#" so that it looks something like this:

Reboot the server now for the changes to take affect.

If you want to re-enable IPv6, just undo the changes (remove the "#"s) and reboot your server

Conclusion

This article outlined steps to disable IPv6 on your Webdock server either temporarily or permanently.

Contact Webdock Support if you run into any errors or need further assistance.