Red Hat distributions
Here are the steps to disable the IPv6 on Red Hat distribution.
Open a terminal window.
Change to the root user.
Type these commands:
sysctl -w net.ipv6.conf.all.disable_ipv6=1
sysctl -w net.ipv6.conf.default.disable_ipv6=1
sysctl -w net.ipv6.conf.tun0.disable_ipv6=1
For enabling IPv6 again you must type the below commands:
sysctl -w net.ipv6.conf.all.disable_ipv6=0
sysctl -w net.ipv6.conf.default.disable_ipv6=0
sysctl -w net.ipv6.conf.tun0.disable_ipv6=0
sysctl -p
Debian based distributions
Here are the steps to disable the IPv6 on Debian distribution.
Open a terminal window.
Type the below command:
sudo nano /etc/sysctl.conf
Add the following at the bottom of the file:
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.tun0.disable_ipv6 = 1
Save and close the file.
Reboot the device.
To re-enable IPv6, remove the above lines from /etc/sysctl.conf and reboot the device.