Disable IPv6 Permantly

this tutorial is how to disable ipv6 on linux, for the first go to /etc/sysctl.conf and add the following script:

sudo nano /etc/sysctl.conf and add following lines

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

Disable IPv6 Permantly.

Now run following command:

sudo sysctl -p

then your ipv6 automatically disabled by sysctl, to open it again simply delete the script above and do update sysctl back :)