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Howto disable IPv6 Stack Ubuntu Linux

Sometimes network infrastructures are misconfigured to use ipv6 stack. Then you want to disable it at all. For ubuntu distribution it is easy as changing sysctl.conf and reboot your machine. Here is how to do it.

First check whether it is enabled or not:
$ cat /proc/sys/net/ipv6/conf/all/disable_ipv6
if output is 0 it is enabled and 1 it is disabled.

Adding the following rows is enough to disable ipv6 stack then restart your computer to take effect:
# vi /etc/sysctl.conf
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.all.disable_ipv6 = 1
# shutdown -r now

When your computer is up again, you can check it:
$ cat /proc/sys/net/ipv6/conf/all/disable_ipv6


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