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A J
Asked: 2014-03-29 23:59:31 +0800 CST

How to disable IPv6 in Ubuntu 14.04?

  • 772

I am using Ubuntu 14.04. And I have done the following to disable ipv6.

I have open /etc/sysctl.conf using gedit and paste the following lines at the end of sysctl.conf. 

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

But when I check it using following command, 

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

I am getting result as '0'( i.e still Enabled). Please help me to disable ipv6, so that I can use hadoop.

I followed instructions from this link.

14.04

3 Answers

  1. Best Answer

    To disable ipv6, you have to 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

    If ipv6 is still not disabled, then the problem is that 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, if you run:

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

    It will report:

    1

    If you see 1, ipv6 has been successfully disabled.

    • 227

  2. You might want to disable it right from the boot. For this purpose, open /etc/default/grub with your favorite text editor with root access (maybe sudo vi /etc/default/grub.

    In this file, find this line:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

    and change it to:

    GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 quiet splash"

    Save the file and update grub by running:

    sudo update-grub

    =============================
    Mint 19 and Ubuntu 18.04:

    on Mint 19 it would be "xed admin:///etc/default/grub" and maybe on Ubuntu 18.04 "gedit admin:///etc/default/grub" to get a GUI editor for doing the edits to the file. The rest of the steps will be the same.

    • 18

  3. In addition to Ross Rogers answer above you should add:

    sudo nano /etc/init/scip.conf

# description "Start sysctl at boot"

description "sysctl"

start on runlevel [2345]
stop on runlevel [016]

console log

respawn
respawn limit unlimited

exec /sbin/sysctl -p
    • -2