How To Disable IPV6 on Linux

To disable ipv6, open /etc/sysctl.conf using any text editor and insert the following lines at the end:

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

To check it after that run: cat /proc/sys/net/ipv6/conf/all/disable_ipv6

If it reports ‘1′ means you have disabled IPV6. If it reports ‘0‘ then do the following:

If ipv6 is still not disabled then sysctl.conf is still not activated:

To solve this, open a terminal (Ctrl+Alt+T) and type the command,

sudo sysctl -p

You will see this in the terminal:

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

After that to check it again run:

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

It will report:

1

If you see 1, IPv6 has been successfully disabled.

See Also:

• How to disable IPv6 on Windows 7 and 10