Disable IPV6 Ubuntu Server

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To disable ipv6 have to open /etc/sysctl.conf using any text editor, 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 still ipv6 not disabled, then the problem is sysctl.conf still not activated, to solve it you can do the following, Open terminal(Ctrl+Alt+T) and type the following command, sudo sysctl -p You will get result in terminal as, 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 check, $ cat /proc/sys/net/ipv6/conf/all/disable_ipv6 You will get result as, 1 If you get result as 1, ipv6 disabled successfully. http://askubuntu.com/questions/440649/how-to-disable-ipv6-in-ubuntu-14-04