How to disable ipv6 in ubuntu linux

FREQUENTLY ASKED QUESTIONS (Ubuntu)
Q: How to disable IPv6 in ubuntu linux?

Disable IPv6 if you do not use in your network.
Edit the sysctl configuration file in /etc/ directory 


user@ubuntu:~$ sudo vi /etc/sysctl.conf
#Add the below line to bottom of the "sysctl.conf" file
net.ipv6.conf.all.disable_ipv6=1
#(save the file)

click to enlarge (disable ipv6 in ubuntu)

And now reboot your ubuntu machine
user@ubuntu:~$ sudo reboot


Verify the IPv6 is disabled
user@ubuntu:~$ ifconfig                 (verify ipv6 address is not showing)

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Disable IPv6 in Linux RPM distributions

FREQUENTLY ASKED QUESTIONS  (Linux)
Q: How to disable IPv6 module in Linux? (Fedora,CentOS,Redhat)

Disable IPv6 networking if not using. Add a new configuration file in "/etc/modprobe.d/"
[root@server ~#]vi /etc/modprobe.d/ipv6.conf

install ipv6 /bin/true

# (add the above line and save the file)

Remove ipv6tables from startup

[root@server ~#]service ipv6tables stop

[root@server ~#]chkconfig ipv6tables off

Reboot the machine to take effect.

[root@server ~#]reboot

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