138

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.

Stefano Palazzo
  • 88,393
A J
  • 11,557

3 Answers3

230

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.

Ross Rogers
  • 147
A J
  • 11,557
18

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.

Daniel Reinhardt
  • 3
Mostafa Ahangarha
  • 4,687
-2

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
scopa
  • 207