Sometimes you will want to disable IPv6, in this article we will describe how to easily disable it.
Start by logging into your server as root user.
1. Edit /etc/sysctl.d/99-sysctl.conf (vim /etc/sysctl.d/99-sysctl.conf or nano /etc/sysctl.d/99-sysctl.conf)
2. Add the following lines to the end of the file:
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
3. Save and exit the file
4. Reload the values
$ sysctl -p
5. Validate that IPv6 is disabled by running this command:
$ ip a
You should not see any 'inet6' lines anymore.
To verify this has worked reboot your server and run the last command again to see if it completely came through.
