How To Disable IPv6 Under Ubuntu/Linux Mint

In this tutorial, we will see how to disable IPv6 on Ubuntu using two methods. You should know that these two methods are also applicable on other Ubuntu derivatives.

Method 1

1. On Ubuntu/Linux Mint, launch the terminal and issue this command to check whether IPv6 is enabled or not:

cat /proc/sys/net/ipv6/conf/all/disable_ipv6

• 0 --> Enabled
• 1 --> Disabled

2. To disable IPv6, we need to edit the 'sysctl.conf' file. So, via the terminal, issue this command:

gksudo gedit /etc/sysctl.conf

Then add these four lines:

# IPv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

Save the file and close it.

3. Issue now this command to reload your configuration:

sudo sysctl -p

IPv6 is now disabled, you can check its status with the first command given above (1 --> disabled).

Method 2


From the Terminal, run this command:

gksudo gedit /etc/default/grub


Then replace this line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

with this line:

GRUB_CMDLINE_LINUX_DEFAULT=”ipv6.disable=1 quiet splash”

Save the file and close it, then update the Grub boot loader with this command:

sudo update-grub

That's it!